[DRBD-user] drbd 9.0 NULL pointer dereference at at 0000000000000098

Evzen Demcenko demcenko at cldn.cz
Thu May 16 16:38:56 CEST 2019


While trying to setup drbd90 resource on Centos7.6 with latest kernel 
(3.10.0-957.12.2.el7.x86_64) i was always getting kernel panic after 
drbdadm attach:
[  128.868366] NULL pointer dereference at 0000000000000098
[  128.868416] IP: [<ffffffffc05f4a45>] request_timer_fn+0x6a5/0x840 [drbd]
(full vmcore-dmesg is attached)
The problem is in request_timer_fn function where it does not check 
whether list_first_entry_or_null returned entry or null and tries to 
access structure member of NULL.
The obvious patch resolves the issue

--- old/drbd/drbd_req.c 2018-10-15 03:46:21.000000000 -0400
+++ new/drbd/drbd_req_new.c     2019-05-16 09:59:50.194034908 -0400
@@ -2445,12 +2445,14 @@ void request_timer_fn(DRBD_TIMER_FN_ARG)
         /* FIXME right now, this basically does a full transfer log 
walk *every time* */
         spin_lock_irq(&device->resource->req_lock);
         if (dt) {
-               unsigned long write_pre_submit_jif, read_pre_submit_jif;
+               unsigned long write_pre_submit_jif = 0, 
read_pre_submit_jif = 0;
                 req_read = 
list_first_entry_or_null(&device->pending_completion[0], struct 
drbd_request, req_pending_local);
                 req_write = 
list_first_entry_or_null(&device->pending_completion[1], struct 
drbd_request, req_pending_local);

-               write_pre_submit_jif = req_write->pre_submit_jif;
-               read_pre_submit_jif = req_read->pre_submit_jif;
+               if (req_write)
+                       write_pre_submit_jif = req_write->pre_submit_jif;
+               if (req_read)
+                       read_pre_submit_jif = req_read->pre_submit_jif;
                 oldest_submit_jif =
                         (req_write && req_read)
                         ? ( time_before(write_pre_submit_jif, 
read_pre_submit_jif)

-- 
Ing. Evzen Demcenko
Senior Linux Administrator
Cluster Design s.r.o.

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[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 3.10.0-957.12.2.el7.x86_64 (mockbuild at kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC) ) #1 SMP Tue May 14 21:24:32 UTC 2019
[    0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.10.0-957.12.2.el7.x86_64 root=UUID=889bce62-923a-46cd-8848-5f762286aed8 ro crashkernel=auto rhgb quiet LANG=en_US.UTF-8
[    0.000000] e820: BIOS-provided physical RAM map:
[    0.000000] BIOS-e820: [mem 0x0000000000000000-0x000000000009fbff] usable
[    0.000000] BIOS-e820: [mem 0x000000000009fc00-0x000000000009ffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000000f0000-0x00000000000fffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000000100000-0x00000000bfffdfff] usable
[    0.000000] BIOS-e820: [mem 0x00000000bfffe000-0x00000000bfffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000feffc000-0x00000000feffffff] reserved
[    0.000000] BIOS-e820: [mem 0x00000000fffc0000-0x00000000ffffffff] reserved
[    0.000000] BIOS-e820: [mem 0x0000000100000000-0x000000013fffffff] usable
[    0.000000] NX (Execute Disable) protection: active
[    0.000000] SMBIOS 2.4 present.
[    0.000000] DMI: Red Hat KVM, BIOS Bochs 01/01/2011
[    0.000000] Hypervisor detected: KVM
[    0.000000] e820: update [mem 0x00000000-0x00000fff] usable ==> reserved
[    0.000000] e820: remove [mem 0x000a0000-0x000fffff] usable
[    0.000000] e820: last_pfn = 0x140000 max_arch_pfn = 0x400000000
[    0.000000] MTRR default type: write-back
[    0.000000] MTRR fixed ranges enabled:
[    0.000000]   00000-9FFFF write-back
[    0.000000]   A0000-BFFFF uncachable
[    0.000000]   C0000-FFFFF write-protect
[    0.000000] MTRR variable ranges enabled:
[    0.000000]   0 base 0000C0000000 mask 3FFFC0000000 uncachable
[    0.000000]   1 disabled
[    0.000000]   2 disabled
[    0.000000]   3 disabled
[    0.000000]   4 disabled
[    0.000000]   5 disabled
[    0.000000]   6 disabled
[    0.000000]   7 disabled
[    0.000000] PAT configuration [0-7]: WB  WC  UC- UC  UC  UC  UC  UC  
[    0.000000] e820: last_pfn = 0xbfffe max_arch_pfn = 0x400000000
[    0.000000] found SMP MP-table at [mem 0x000fda10-0x000fda1f] mapped at [ffffffffff200a10]
[    0.000000] Base memory trampoline at [ffff935300099000] 99000 size 24576
[    0.000000] BRK [0x2c852000, 0x2c852fff] PGTABLE
[    0.000000] BRK [0x2c853000, 0x2c853fff] PGTABLE
[    0.000000] BRK [0x2c854000, 0x2c854fff] PGTABLE
[    0.000000] BRK [0x2c855000, 0x2c855fff] PGTABLE
[    0.000000] BRK [0x2c856000, 0x2c856fff] PGTABLE
[    0.000000] RAMDISK: [mem 0x35bdb000-0x36de5fff]
[    0.000000] Early table checksum verification disabled
[    0.000000] ACPI: RSDP 00000000000fd7c0 00014 (v00 BOCHS )
[    0.000000] ACPI: RSDT 00000000bffffbd6 00030 (v01 BOCHS  BXPCRSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: FACP 00000000bffff177 00074 (v01 BOCHS  BXPCFACP 00000001 BXPC 00000001)
[    0.000000] ACPI: DSDT 00000000bfffe040 01137 (v01   BXPC   BXDSDT 00000001 INTL 20090123)
[    0.000000] ACPI: FACS 00000000bfffe000 00040
[    0.000000] ACPI: SSDT 00000000bffff1eb 0095B (v01 BOCHS  BXPCSSDT 00000001 BXPC 00000001)
[    0.000000] ACPI: APIC 00000000bffffb46 00090 (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] No NUMA configuration found
[    0.000000] Faking a node at [mem 0x0000000000000000-0x000000013fffffff]
[    0.000000] NODE_DATA(0) allocated [mem 0x13ffd6000-0x13fffcfff]
[    0.000000] Reserving 161MB of memory at 528MB for crashkernel (System RAM: 4095MB)
[    0.000000] kvm-clock: cpu 0, msr 1:3ff85001, primary cpu clock
[    0.000000] kvm-clock: Using msrs 4b564d01 and 4b564d00Zone ranges:
[    0.000000]   DMA      [mem 0x00001000-0x00ffffff]
[    0.000000]   DMA32    [mem 0x01000000-0xffffffff]
[    0.000000]   Normal   [mem 0x100000000-0x13fffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x00001000-0x0009efff]
[    0.000000]   node   0: [mem 0x00100000-0xbfffdfff]
[    0.000000]   node   0: [mem 0x100000000-0x13fffffff]
[    0.000000] Initmem setup node 0 [mem 0x00001000-0x13fffffff]
[    0.000000] On node 0 totalpages: 1048476
[    0.000000]   DMA zone: 64 pages used for memmap
[    0.000000]   DMA zone: 21 pages reserved
[    0.000000]   DMA zone: 3998 pages, LIFO batch:0
[    0.000000]   DMA32 zone: 12224 pages used for memmap
[    0.000000]   DMA32 zone: 782334 pages, LIFO batch:31
[    0.000000]   Normal zone: 4096 pages used for memmap
[    0.000000]   Normal zone: 262144 pages, LIFO batch:31
[    0.000000] ACPI: PM-Timer IO Port: 0xb008
[    0.000000] ACPI: Local APIC address 0xfee00000
[    0.000000] ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
[    0.000000] ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] enabled)
[    0.000000] ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])
[    0.000000] ACPI: IOAPIC (id[0x00] address[0xfec00000] gsi_base[0])
[    0.000000] IOAPIC[0]: apic_id 0, version 17, address 0xfec00000, GSI 0-23
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 5 global_irq 5 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 10 global_irq 10 high level)
[    0.000000] ACPI: INT_SRC_OVR (bus 0 bus_irq 11 global_irq 11 high level)
[    0.000000] ACPI: IRQ0 used by override.
[    0.000000] ACPI: IRQ5 used by override.
[    0.000000] ACPI: IRQ9 used by override.
[    0.000000] ACPI: IRQ10 used by override.
[    0.000000] ACPI: IRQ11 used by override.
[    0.000000] Using ACPI (MADT) for SMP configuration information
[    0.000000] smpboot: Allowing 4 CPUs, 0 hotplug CPUs
[    0.000000] PM: Registered nosave memory: [mem 0x0009f000-0x0009ffff]
[    0.000000] PM: Registered nosave memory: [mem 0x000a0000-0x000effff]
[    0.000000] PM: Registered nosave memory: [mem 0x000f0000-0x000fffff]
[    0.000000] PM: Registered nosave memory: [mem 0xbfffe000-0xbfffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xc0000000-0xfeffbfff]
[    0.000000] PM: Registered nosave memory: [mem 0xfeffc000-0xfeffffff]
[    0.000000] PM: Registered nosave memory: [mem 0xff000000-0xfffbffff]
[    0.000000] PM: Registered nosave memory: [mem 0xfffc0000-0xffffffff]
[    0.000000] e820: [mem 0xc0000000-0xfeffbfff] available for PCI devices
[    0.000000] Booting paravirtualized kernel on KVM
[    0.000000] setup_percpu: NR_CPUS:5120 nr_cpumask_bits:4 nr_cpu_ids:4 nr_node_ids:1
[    0.000000] PERCPU: Embedded 38 pages/cpu @ffff93543fc00000 s118784 r8192 d28672 u524288
[    0.000000] pcpu-alloc: s118784 r8192 d28672 u524288 alloc=1*2097152
[    0.000000] pcpu-alloc: [0] 0 1 2 3 
[    0.000000] kvm-stealtime: cpu 0, msr 13fc1c040
[    0.000000] Built 1 zonelists in Node order, mobility grouping on.  Total pages: 1032071
[    0.000000] Policy zone: Normal
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.10.0-957.12.2.el7.x86_64 root=UUID=889bce62-923a-46cd-8848-5f762286aed8 ro crashkernel=auto rhgb quiet LANG=en_US.UTF-8
[    0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[    0.000000] x86/fpu: xstate_offset[2]: 0240, xstate_sizes[2]: 0100
[    0.000000] xsave: enabled xstate_bv 0x7, cntxt size 0x340 using standard form
[    0.000000] Memory: 3858728k/5242880k available (7668k kernel code, 1048976k absent, 335176k reserved, 6052k data, 1876k init)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] x86/pti: Unmapping kernel while in userspace
[    0.000000] Hierarchical RCU implementation.
[    0.000000] 	RCU restricting CPUs from NR_CPUS=5120 to nr_cpu_ids=4.
[    0.000000] NR_IRQS:327936 nr_irqs:456 0
[    0.000000] Console: colour VGA+ 80x25
[    0.000000] console [tty0] enabled
[    0.000000] allocated 16777216 bytes of page_cgroup
[    0.000000] please try 'cgroup_disable=memory' option if you don't want memory cgroups
[    0.000000] tsc: Detected 3499.996 MHz processor
[    0.002000] Calibrating delay loop (skipped) preset value.. 6999.99 BogoMIPS (lpj=3499996)
[    0.002000] pid_max: default: 32768 minimum: 301
[    0.002000] Security Framework initialized
[    0.002000] SELinux:  Initializing.
[    0.002000] SELinux:  Starting in permissive mode
[    0.002000] Yama: becoming mindful.
[    0.002000] Dentry cache hash table entries: 524288 (order: 10, 4194304 bytes)
[    0.003016] Inode-cache hash table entries: 262144 (order: 9, 2097152 bytes)
[    0.003818] Mount-cache hash table entries: 8192 (order: 4, 65536 bytes)
[    0.003822] Mountpoint-cache hash table entries: 8192 (order: 4, 65536 bytes)
[    0.004048] Initializing cgroup subsys memory
[    0.004051] Initializing cgroup subsys devices
[    0.004053] Initializing cgroup subsys freezer
[    0.004054] Initializing cgroup subsys net_cls
[    0.004055] Initializing cgroup subsys blkio
[    0.004056] Initializing cgroup subsys perf_event
[    0.004057] Initializing cgroup subsys hugetlb
[    0.004058] Initializing cgroup subsys pids
[    0.004059] Initializing cgroup subsys net_prio
[    0.004117] mce: CPU supports 10 MCE banks
[    0.004164] Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
[    0.004165] Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0
[    0.004165] tlb_flushall_shift: 6
[    0.004167] Speculative Store Bypass: Vulnerable
[    0.004168] FEATURE SPEC_CTRL Not Present
[    0.004169] FEATURE IBPB_SUPPORT Not Present
[    0.004407] Spectre V2 : Vulnerable: Retpoline without IBPB
[    0.004450] MDS: Vulnerable: Clear CPU buffers attempted, no microcode
[    0.004920] Freeing SMP alternatives: 28k freed
[    0.010709] ACPI: Core revision 20130517
[    0.011232] ACPI: All ACPI Tables successfully acquired
[    0.011252] ftrace: allocating 29205 entries in 115 pages
[    0.028264] Enabling x2apic
[    0.028268] Enabled x2apic
[    0.028424] Switched APIC routing to physical x2apic.
[    0.029867] ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
[    0.029868] smpboot: CPU0: Intel Core Processor (Broadwell) (fam: 06, model: 3d, stepping: 02)
[    0.029879] TSC deadline timer enabled
[    0.029888] Performance Events: unsupported p6 CPU model 61 no PMU driver, software events only.
[    0.002000] kvm-clock: cpu 1, msr 1:3ff85041, secondary cpu clock
[    0.031020] kvm-stealtime: cpu 1, msr 13fc9c040
[    0.002000] kvm-clock: cpu 2, msr 1:3ff85081, secondary cpu clock
[    0.032018] kvm-stealtime: cpu 2, msr 13fd1c040
[    0.030133] smpboot: Booting Node   0, Processors  #1 #2 #3 OK
[    0.002000] kvm-clock: cpu 3, msr 1:3ff850c1, secondary cpu clock
[    0.033022] Brought up 4 CPUs
[    0.033024] smpboot: Max logical packages: 2
[    0.033025] smpboot: Total of 4 processors activated (27999.96 BogoMIPS)
[    0.033016] kvm-stealtime: cpu 3, msr 13fd9c040
[    0.033491] devtmpfs: initialized
[    0.034997] EVM: security.selinux
[    0.034998] EVM: security.ima
[    0.034999] EVM: security.capability
[    0.035947] atomic64 test passed for x86-64 platform with CX8 and with SSE
[    0.035949] pinctrl core: initialized pinctrl subsystem
[    0.036054] RTC time: 13:41:23, date: 05/16/19
[    0.036132] NET: Registered protocol family 16
[    0.036365] ACPI: bus type PCI registered
[    0.036367] acpiphp: ACPI Hot Plug PCI Controller Driver version: 0.5
[    0.036465] PCI: Using configuration type 1 for base access
[    0.042076] ACPI: Added _OSI(Module Device)
[    0.042078] ACPI: Added _OSI(Processor Device)
[    0.042079] ACPI: Added _OSI(3.0 _SCP Extensions)
[    0.042080] ACPI: Added _OSI(Processor Aggregator Device)
[    0.042081] ACPI: Added _OSI(Linux-Dell-Video)
[    0.042411] ACPI: EC: Look up EC in DSDT
[    0.043784] ACPI: Interpreter enabled
[    0.043791] ACPI: (supports S0 S5)
[    0.043792] ACPI: Using IOAPIC for interrupt routing
[    0.043801] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
[    0.044000] ACPI: Enabled 16 GPEs in block 00 to 0F
[    0.045687] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
[    0.045691] acpi PNP0A03:00: _OSC: OS supports [ASPM ClockPM Segments MSI]
[    0.045695] acpi PNP0A03:00: _OSC failed (AE_NOT_FOUND); disabling ASPM
[    0.045699] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended PCI configuration space under this bridge.
[    0.045908] acpiphp: Slot [3] registered
[    0.045932] acpiphp: Slot [4] registered
[    0.045950] acpiphp: Slot [5] registered
[    0.045969] acpiphp: Slot [6] registered
[    0.045990] acpiphp: Slot [7] registered
[    0.046010] acpiphp: Slot [8] registered
[    0.046029] acpiphp: Slot [9] registered
[    0.046047] acpiphp: Slot [10] registered
[    0.046065] acpiphp: Slot [11] registered
[    0.046083] acpiphp: Slot [12] registered
[    0.046104] acpiphp: Slot [13] registered
[    0.046122] acpiphp: Slot [14] registered
[    0.046140] acpiphp: Slot [15] registered
[    0.046159] acpiphp: Slot [16] registered
[    0.046177] acpiphp: Slot [17] registered
[    0.046195] acpiphp: Slot [18] registered
[    0.046213] acpiphp: Slot [19] registered
[    0.046233] acpiphp: Slot [20] registered
[    0.046252] acpiphp: Slot [21] registered
[    0.046270] acpiphp: Slot [22] registered
[    0.046288] acpiphp: Slot [23] registered
[    0.046306] acpiphp: Slot [24] registered
[    0.046324] acpiphp: Slot [25] registered
[    0.046342] acpiphp: Slot [26] registered
[    0.046364] acpiphp: Slot [27] registered
[    0.046383] acpiphp: Slot [28] registered
[    0.046401] acpiphp: Slot [29] registered
[    0.046419] acpiphp: Slot [30] registered
[    0.046446] acpiphp: Slot [31] registered
[    0.046455] PCI host bridge to bus 0000:00
[    0.046458] pci_bus 0000:00: root bus resource [io  0x0000-0x0cf7 window]
[    0.046459] pci_bus 0000:00: root bus resource [io  0x0d00-0xffff window]
[    0.046461] pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
[    0.046463] pci_bus 0000:00: root bus resource [mem 0xc0000000-0xfebfffff window]
[    0.046464] pci_bus 0000:00: root bus resource [bus 00-ff]
[    0.046486] pci 0000:00:00.0: [8086:1237] type 00 class 0x060000
[    0.046706] pci 0000:00:01.0: [8086:7000] type 00 class 0x060100
[    0.047017] pci 0000:00:01.1: [8086:7010] type 00 class 0x010180
[    0.049959] pci 0000:00:01.1: reg 0x20: [io  0xc0e0-0xc0ef]
[    0.050965] pci 0000:00:01.1: legacy IDE quirk: reg 0x10: [io  0x01f0-0x01f7]
[    0.050967] pci 0000:00:01.1: legacy IDE quirk: reg 0x14: [io  0x03f6]
[    0.050968] pci 0000:00:01.1: legacy IDE quirk: reg 0x18: [io  0x0170-0x0177]
[    0.050970] pci 0000:00:01.1: legacy IDE quirk: reg 0x1c: [io  0x0376]
[    0.051062] pci 0000:00:01.2: [8086:7020] type 00 class 0x0c0300
[    0.053957] pci 0000:00:01.2: reg 0x20: [io  0xc080-0xc09f]
[    0.055060] pci 0000:00:01.3: [8086:7113] type 00 class 0x068000
[    0.055285] pci 0000:00:01.3: quirk: [io  0xb000-0xb03f] claimed by PIIX4 ACPI
[    0.055290] pci 0000:00:01.3: quirk: [io  0xb100-0xb10f] claimed by PIIX4 SMB
[    0.055422] pci 0000:00:02.0: [1013:00b8] type 00 class 0x030000
[    0.056743] pci 0000:00:02.0: reg 0x10: [mem 0xfc000000-0xfdffffff pref]
[    0.057736] pci 0000:00:02.0: reg 0x14: [mem 0xfebd0000-0xfebd0fff]
[    0.063034] pci 0000:00:02.0: reg 0x30: [mem 0xfebc0000-0xfebcffff pref]
[    0.063409] pci 0000:00:03.0: [1af4:1000] type 00 class 0x020000
[    0.064624] pci 0000:00:03.0: reg 0x10: [io  0xc0a0-0xc0bf]
[    0.065620] pci 0000:00:03.0: reg 0x14: [mem 0xfebd1000-0xfebd1fff]
[    0.070623] pci 0000:00:03.0: reg 0x30: [mem 0xfeb80000-0xfebbffff pref]
[    0.070807] pci 0000:00:04.0: [1af4:1001] type 00 class 0x010000
[    0.071624] pci 0000:00:04.0: reg 0x10: [io  0xc000-0xc03f]
[    0.072622] pci 0000:00:04.0: reg 0x14: [mem 0xfebd2000-0xfebd2fff]
[    0.077795] pci 0000:00:05.0: [1af4:1001] type 00 class 0x010000
[    0.078620] pci 0000:00:05.0: reg 0x10: [io  0xc040-0xc07f]
[    0.079623] pci 0000:00:05.0: reg 0x14: [mem 0xfebd3000-0xfebd3fff]
[    0.084799] pci 0000:00:06.0: [1af4:1002] type 00 class 0x00ff00
[    0.085331] pci 0000:00:06.0: reg 0x10: [io  0xc0c0-0xc0df]
[    0.088747] ACPI: PCI Interrupt Link [LNKA] (IRQs 5 *10 11)
[    0.088809] ACPI: PCI Interrupt Link [LNKB] (IRQs 5 *10 11)
[    0.088861] ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 *11)
[    0.088910] ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 *11)
[    0.088940] ACPI: PCI Interrupt Link [LNKS] (IRQs *9)
[    0.089364] vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
[    0.089364] vgaarb: loaded
[    0.089364] vgaarb: bridge control possible 0000:00:02.0
[    0.089364] SCSI subsystem initialized
[    0.089364] ACPI: bus type USB registered
[    0.089364] usbcore: registered new interface driver usbfs
[    0.089364] usbcore: registered new interface driver hub
[    0.089364] usbcore: registered new device driver usb
[    0.089469] EDAC MC: Ver: 3.0.0
[    0.090121] PCI: Using ACPI for IRQ routing
[    0.090121] PCI: pci_cache_line_size set to 64 bytes
[    0.090174] e820: reserve RAM buffer [mem 0x0009fc00-0x0009ffff]
[    0.090178] e820: reserve RAM buffer [mem 0xbfffe000-0xbfffffff]
[    0.090381] NetLabel: Initializing
[    0.090384] NetLabel:  domain hash size = 128
[    0.090384] NetLabel:  protocols = UNLABELED CIPSOv4
[    0.090401] NetLabel:  unlabeled traffic allowed by default
[    0.090450] amd_nb: Cannot enumerate AMD northbridges
[    0.090450] Switched to clocksource kvm-clock
[    0.095971] pnp: PnP ACPI init
[    0.095984] ACPI: bus type PNP registered
[    0.096067] pnp 00:00: Plug and Play ACPI device, IDs PNP0b00 (active)
[    0.096107] pnp 00:01: Plug and Play ACPI device, IDs PNP0303 (active)
[    0.096139] pnp 00:02: Plug and Play ACPI device, IDs PNP0f13 (active)
[    0.096165] pnp 00:03: [dma 2]
[    0.096176] pnp 00:03: Plug and Play ACPI device, IDs PNP0700 (active)
[    0.096306] pnp: PnP ACPI: found 4 devices
[    0.096308] ACPI: bus type PNP unregistered
[    0.103418] pci_bus 0000:00: resource 4 [io  0x0000-0x0cf7 window]
[    0.103420] pci_bus 0000:00: resource 5 [io  0x0d00-0xffff window]
[    0.103422] pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff window]
[    0.103423] pci_bus 0000:00: resource 7 [mem 0xc0000000-0xfebfffff window]
[    0.103458] NET: Registered protocol family 2
[    0.103703] TCP established hash table entries: 32768 (order: 6, 262144 bytes)
[    0.103828] TCP bind hash table entries: 32768 (order: 7, 524288 bytes)
[    0.104031] TCP: Hash tables configured (established 32768 bind 32768)
[    0.104090] TCP: reno registered
[    0.104094] UDP hash table entries: 2048 (order: 4, 65536 bytes)
[    0.104123] UDP-Lite hash table entries: 2048 (order: 4, 65536 bytes)
[    0.104197] NET: Registered protocol family 1
[    0.104216] pci 0000:00:00.0: Limiting direct PCI/PCI transfers
[    0.104229] pci 0000:00:01.0: PIIX3: Enabling Passive Release
[    0.104241] pci 0000:00:01.0: Activating ISA DMA hang workarounds
[    0.104443] ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11
[    0.104864] pci 0000:00:02.0: Boot video device
[    0.104890] PCI: CLS 0 bytes, default 64
[    0.104938] Unpacking initramfs...
[    0.303759] Freeing initrd memory: 18476k freed
[    0.305904] PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
[    0.305912] software IO TLB [mem 0xbbffe000-0xbfffe000] (64MB) mapped at [ffff9353bbffe000-ffff9353bfffdfff]
[    0.309669] sha1_ssse3: Using AVX2 optimized SHA-1 implementation
[    0.309766] sha256_ssse3: Using AVX2 optimized SHA-256 implementation
[    0.310083] futex hash table entries: 1024 (order: 4, 65536 bytes)
[    0.310121] Initialise system trusted keyring
[    0.310149] audit: initializing netlink socket (disabled)
[    0.310160] type=2000 audit(1558014083.919:1): initialized
[    0.328117] HugeTLB registered 2 MB page size, pre-allocated 0 pages
[    0.329153] zpool: loaded
[    0.329155] zbud: loaded
[    0.329425] VFS: Disk quotas dquot_6.5.2
[    0.329446] Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[    0.329609] msgmni has been set to 7572
[    0.329656] Key type big_key registered
[    0.329661] SELinux:  Registering netfilter hooks
[    0.330930] NET: Registered protocol family 38
[    0.330936] Key type asymmetric registered
[    0.330941] Asymmetric key parser 'x509' registered
[    0.330969] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 248)
[    0.331025] io scheduler noop registered
[    0.331028] io scheduler deadline registered (default)
[    0.331049] io scheduler cfq registered
[    0.331052] io scheduler mq-deadline registered
[    0.331055] io scheduler kyber registered
[    0.331154] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
[    0.331160] pciehp: PCI Express Hot Plug Controller Driver version: 0.4
[    0.331171] shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
[    0.331239] intel_idle: does not run on family 6 model 61
[    0.331296] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input0
[    0.331298] ACPI: Power Button [PWRF]
[    0.331471] GHES: HEST is not enabled!
[    0.331549] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[    0.332026] Non-volatile memory driver v1.3
[    0.332063] Linux agpgart interface v0.103
[    0.332166] crash memory driver: version 1.1
[    0.332217] rdac: device handler registered
[    0.332264] hp_sw: device handler registered
[    0.332266] emc: device handler registered
[    0.332322] alua: device handler registered
[    0.332355] libphy: Fixed MDIO Bus: probed
[    0.332401] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    0.332405] ehci-pci: EHCI PCI platform driver
[    0.332415] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    0.332421] ohci-pci: OHCI PCI platform driver
[    0.332431] uhci_hcd: USB Universal Host Controller Interface driver
[    0.332955] uhci_hcd 0000:00:01.2: UHCI Host Controller
[    0.333021] uhci_hcd 0000:00:01.2: new USB bus registered, assigned bus number 1
[    0.333037] uhci_hcd 0000:00:01.2: detected 2 ports
[    0.333108] uhci_hcd 0000:00:01.2: irq 11, io base 0x0000c080
[    0.333184] usb usb1: New USB device found, idVendor=1d6b, idProduct=0001
[    0.333185] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[    0.333187] usb usb1: Product: UHCI Host Controller
[    0.333188] usb usb1: Manufacturer: Linux 3.10.0-957.12.2.el7.x86_64 uhci_hcd
[    0.333190] usb usb1: SerialNumber: 0000:00:01.2
[    0.333280] hub 1-0:1.0: USB hub found
[    0.333284] hub 1-0:1.0: 2 ports detected
[    0.333398] usbcore: registered new interface driver usbserial_generic
[    0.333406] usbserial: USB Serial support registered for generic
[    0.333437] i8042: PNP: PS/2 Controller [PNP0303:KBD,PNP0f13:MOU] at 0x60,0x64 irq 1,12
[    0.333918] serio: i8042 KBD port at 0x60,0x64 irq 1
[    0.333925] serio: i8042 AUX port at 0x60,0x64 irq 12
[    0.334027] mousedev: PS/2 mouse device common for all mice
[    0.334265] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input1
[    0.334959] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input2
[    0.335041] rtc_cmos 00:00: RTC can wake from S4
[    0.335161] input: VirtualPS/2 VMware VMMouse as /devices/platform/i8042/serio1/input/input3
[    0.335395] rtc_cmos 00:00: rtc core: registered rtc_cmos as rtc0
[    0.335452] rtc_cmos 00:00: alarms up to one day, 114 bytes nvram
[    0.335495] cpuidle: using governor menu
[    0.335585] hidraw: raw HID events driver (C) Jiri Kosina
[    0.335682] usbcore: registered new interface driver usbhid
[    0.335683] usbhid: USB HID core driver
[    0.335727] drop_monitor: Initializing network drop monitor service
[    0.335801] TCP: cubic registered
[    0.335805] Initializing XFRM netlink socket
[    0.335891] NET: Registered protocol family 10
[    0.336135] NET: Registered protocol family 17
[    0.336146] mpls_gso: MPLS GSO support
[    0.336440] PM: Hibernation image not present or could not be loaded.
[    0.336443] Loading compiled-in X.509 certificates
[    0.336474] Loaded X.509 cert 'CentOS Linux kpatch signing key: ea0413152cde1d98ebdca3fe6f0230904c9ef717'
[    0.336484] Loaded X.509 cert 'CentOS Linux Driver update signing key: 7f421ee0ab69461574bb358861dbe77762a4201b'
[    0.336799] Loaded X.509 cert 'CentOS Linux kernel signing key: 8de64fb5969b557edc7f032eeabcbe4f37177f4e'
[    0.336817] registered taskstats version 1
[    0.338948] Key type trusted registered
[    0.340502] Key type encrypted registered
[    0.340518] IMA: No TPM chip found, activating TPM-bypass! (rc=-19)
[    0.340705]   Magic number: 3:706:685
[    0.340706]   hash matches drivers/base/power/main.c:576
[    0.340710] misc nvram: hash matches
[    0.340713]  clocksource: hash matches
[    0.340808] rtc_cmos 00:00: setting system clock to 2019-05-16 13:41:23 UTC (1558014083)
[    0.341404] Freeing unused kernel memory: 1876k freed
[    0.341995] Write protecting the kernel read-only data: 12288k
[    0.342852] Freeing unused kernel memory: 512k freed
[    0.343950] Freeing unused kernel memory: 600k freed
[    0.346760] random: systemd: uninitialized urandom read (16 bytes read)
[    0.347041] random: systemd: uninitialized urandom read (16 bytes read)
[    0.347050] random: systemd: uninitialized urandom read (16 bytes read)
[    0.347730] systemd[1]: systemd 219 running in system mode. (+PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 -SECCOMP +BLKID +ELFUTILS +KMOD +IDN)
[    0.347749] systemd[1]: Detected virtualization kvm.
[    0.347753] systemd[1]: Detected architecture x86-64.
[    0.347755] systemd[1]: Running in initial RAM disk.
[    0.347780] systemd[1]: Set hostname to <drtest-72.cldn.internal>.
[    0.368210] random: systemd: uninitialized urandom read (16 bytes read)
[    0.368224] random: systemd: uninitialized urandom read (16 bytes read)
[    0.368244] random: systemd: uninitialized urandom read (16 bytes read)
[    0.368277] random: systemd: uninitialized urandom read (16 bytes read)
[    0.368752] random: systemd: uninitialized urandom read (16 bytes read)
[    0.368864] random: systemd: uninitialized urandom read (16 bytes read)
[    0.369126] random: systemd: uninitialized urandom read (16 bytes read)
[    0.372061] systemd[1]: Reached target Swap.
[    0.372213] systemd[1]: Created slice Root Slice.
[    0.372264] systemd[1]: Created slice System Slice.
[    0.372300] systemd[1]: Listening on udev Control Socket.
[    0.372310] systemd[1]: Reached target Slices.
[    0.372349] systemd[1]: Listening on Journal Socket.
[    0.372728] systemd[1]: Starting Setup Virtual Console...
[    0.373099] systemd[1]: Starting Journal Service...
[    0.373547] systemd[1]: Starting dracut cmdline hook...
[    0.373563] systemd[1]: Reached target Local File Systems.
[    0.373974] systemd[1]: Starting Create list of required static device nodes for the current kernel...
[    0.374431] systemd[1]: Starting Apply Kernel Variables...
[    0.374465] systemd[1]: Listening on udev Kernel Socket.
[    0.374491] systemd[1]: Reached target Sockets.
[    0.374511] systemd[1]: Reached target Timers.
[    0.375806] systemd[1]: Started Create list of required static device nodes for the current kernel.
[    0.376910] systemd[1]: Starting Create Static Device Nodes in /dev...
[    0.379038] systemd[1]: Started Apply Kernel Variables.
[    0.380049] systemd[1]: Started Create Static Device Nodes in /dev.
[    0.382821] systemd[1]: Started Journal Service.
[    0.576347] ACPI: PCI Interrupt Link [LNKC] enabled at IRQ 10
[    0.576393] virtio-pci 0000:00:03.0: virtio_pci: leaving for legacy driver
[    0.577069] virtio-pci 0000:00:04.0: virtio_pci: leaving for legacy driver
[    0.578536] ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 10
[    0.578561] virtio-pci 0000:00:05.0: virtio_pci: leaving for legacy driver
[    0.580307] ACPI: PCI Interrupt Link [LNKB] enabled at IRQ 11
[    0.580325] virtio-pci 0000:00:06.0: virtio_pci: leaving for legacy driver
[    0.594186] libata version 3.00 loaded.
[    0.598404] ata_piix 0000:00:01.1: version 2.13
[    0.601690] scsi host0: ata_piix
[    0.604973] scsi host1: ata_piix
[    0.605023] ata1: PATA max MWDMA2 cmd 0x1f0 ctl 0x3f6 bmdma 0xc0e0 irq 14
[    0.605025] ata2: PATA max MWDMA2 cmd 0x170 ctl 0x376 bmdma 0xc0e8 irq 15
[    0.627288] FDC 0 is a S82078B
[    0.643172] [TTM] Zone  kernel: Available graphics memory: 1940110 kiB
[    0.643175] [TTM] Initializing pool allocator
[    0.643179] [TTM] Initializing DMA pool allocator
[    0.643411] [drm] fb mappable at 0xFC000000
[    0.643412] [drm] vram aper at 0xFC000000
[    0.643413] [drm] size 33554432
[    0.643414] [drm] fb depth is 24
[    0.643415] [drm]    pitch is 3072
[    0.643468] fbcon: cirrusdrmfb (fb0) is primary device
[    0.658316] Console: switching to colour frame buffer device 128x48
[    0.659012] usb 1-1: new full-speed USB device number 2 using uhci_hcd
[    0.660459] cirrus 0000:00:02.0: fb0: cirrusdrmfb frame buffer device
[    0.665048] [drm] Initialized cirrus 1.0.0 20110418 for 0000:00:02.0 on minor 0
[    0.716235] virtio-pci 0000:00:03.0: irq 24 for MSI/MSI-X
[    0.716250] virtio-pci 0000:00:03.0: irq 25 for MSI/MSI-X
[    0.716267] virtio-pci 0000:00:03.0: irq 26 for MSI/MSI-X
[    0.742522] virtio-pci 0000:00:04.0: irq 27 for MSI/MSI-X
[    0.742537] virtio-pci 0000:00:04.0: irq 28 for MSI/MSI-X
[    0.742978] virtio_blk virtio1: [vda] 41943040 512-byte logical blocks (21.4 GB/20.0 GiB)
[    0.745118]  vda: vda1 vda2
[    0.745421] virtio-pci 0000:00:05.0: irq 29 for MSI/MSI-X
[    0.745436] virtio-pci 0000:00:05.0: irq 30 for MSI/MSI-X
[    0.746134] virtio_blk virtio2: [vdb] 209715200 512-byte logical blocks (107 GB/100 GiB)
[    0.840415] usb 1-1: New USB device found, idVendor=0627, idProduct=0001
[    0.840424] usb 1-1: New USB device strings: Mfr=1, Product=3, SerialNumber=5
[    0.840429] usb 1-1: Product: QEMU USB Tablet
[    0.840433] usb 1-1: Manufacturer: QEMU
[    0.840437] usb 1-1: SerialNumber: 42
[    0.849049] input: QEMU QEMU USB Tablet as /devices/pci0000:00/0000:00:01.2/usb1/1-1/1-1:1.0/input/input4
[    0.849175] hid-generic 0003:0627:0001.0001: input,hidraw0: USB HID v0.01 Pointer [QEMU QEMU USB Tablet] on usb-0000:00:01.2-1/input0
[    0.965902] SGI XFS with ACLs, security attributes, no debug enabled
[    0.969324] XFS (vda1): Mounting V5 Filesystem
[    0.969696] random: fast init done
[    1.091665] XFS (vda1): Ending clean mount
[    1.274235] systemd-journald[101]: Received SIGTERM from PID 1 (systemd).
[    1.287602] SELinux:  Disabled at runtime.
[    1.287615] SELinux:  Unregistering netfilter hooks
[    1.312067] tsc: Refined TSC clocksource calibration: 3500.085 MHz
[    1.330092] type=1404 audit(1558014084.489:2): selinux=0 auid=4294967295 ses=4294967295
[    1.341486] ip_tables: (C) 2000-2006 Netfilter Core Team
[    1.341655] systemd[1]: Inserted module 'ip_tables'
[    1.406846] systemd-journald[1398]: Received request to flush runtime journal from PID 1
[    1.531568] piix4_smbus 0000:00:01.3: SMBus Host Controller at 0xb100, revision 0
[    1.535127] input: PC Speaker as /devices/platform/pcspkr/input/input5
[    1.598657] cryptd: max_cpu_qlen set to 1000
[    1.598760] Adding 5346300k swap on /dev/vda2.  Priority:-2 extents:1 across:5346300k FS
[    1.610637] AVX2 version of gcm_enc/dec engaged.
[    1.610639] AES CTR mode by8 optimization enabled
[    1.649456] alg: No test for __gcm-aes-aesni (__driver-gcm-aes-aesni)
[    1.650681] alg: No test for __generic-gcm-aes-aesni (__driver-generic-gcm-aes-aesni)
[    1.674463] type=1305 audit(1558014084.833:3): audit_pid=2443 old=0 auid=4294967295 ses=4294967295 res=1
[    1.718089] ppdev: user-space parallel port driver
[    2.096040] ip6_tables: (C) 2000-2006 Netfilter Core Team
[    2.120479] Ebtables v2.0 registered
[    2.137657] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[    2.166830] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
[    2.230775] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[    2.243689] Netfilter messages via NETLINK v0.30.
[    2.247506] ip_set: protocol 6
[   33.986224] random: crng init done
[  125.477151] drbd: loading out-of-tree module taints kernel.
[  125.478167] drbd: module verification failed: signature and/or required key missing - tainting kernel
[  125.483230] drbd: initialized. Version: 9.0.16-1 (api:2/proto:86-114)
[  125.483232] drbd: GIT-hash: ab9777dfeaf9d619acc9a5201bfcae8103e9529c build by root at drtest-72.cldn.internal, 2019-05-16 09:43:00
[  125.483233] drbd: registered as block device major 147
[  127.842454] drbd r1: Starting worker thread (from drbdsetup [3894])
[  127.847298] drbd r1 drtest-71.cldn.internal: Starting sender thread (from drbdsetup [3898])
[  127.858997] drbd r1/0 drbd1: disk( Diskless -> Attaching )
[  127.859078] drbd r1/0 drbd1: Maximum number of peer devices = 1
[  127.859301] drbd r1: Method to ensure write ordering: flush
[  127.859317] drbd r1/0 drbd1: Adjusting my ra_pages to backing device's (32 -> 1024)
[  127.859320] drbd r1/0 drbd1: drbd_bm_resize called with capacity == 209708728
[  127.863161] drbd r1/0 drbd1: resync bitmap: bits=26213591 words=409588 pages=800
[  127.863165] drbd r1/0 drbd1: size = 100 GB (104854364 KB)
[  127.867849] drbd r1/0 drbd1: recounting of set bits took additional 1ms
[  127.867864] drbd r1/0 drbd1: disk( Attaching -> Inconsistent )
[  127.867868] drbd r1/0 drbd1: attached to current UUID: 0000000000000004
[  127.869099] drbd r1 drtest-71.cldn.internal: conn( StandAlone -> Unconnected )
[  127.869376] drbd r1 drtest-71.cldn.internal: Starting receiver thread (from drbd_w_r1 [3895])
[  127.869695] drbd r1 drtest-71.cldn.internal: conn( Unconnected -> Connecting )
[  128.868097] drbd r1/0 drbd1: passed get_ldev, put_ldev
[  128.868164] drbd r1/0 drbd1: passed req_read
[  128.868224] drbd r1/0 drbd1: passed req_write
[  128.868315] BUG: unable to handle kernel 
[  128.868366] NULL pointer dereference at 0000000000000098
[  128.868416] IP: [<ffffffffc05f4a45>] request_timer_fn+0x6a5/0x840 [drbd]
[  128.868512] PGD 0 
[  128.868555] Oops: 0000 [#1] SMP 
[  128.868578] Modules linked in: drbd_transport_tcp(OE) drbd(OE) ip6t_rpfilter ipt_REJECT nf_reject_ipv4 ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ppdev iosf_mbi crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd joydev parport_pc parport pcspkr i2c_piix4 virtio_balloon ip_tables xfs libcrc32c ata_generic pata_acpi virtio_blk virtio_net cirrus crct10dif_pclmul crct10dif_common crc32c_intel drm_kms_helper serio_raw syscopyarea
[  128.868948]  sysfillrect sysimgblt fb_sys_fops floppy ttm drm ata_piix libata virtio_pci drm_panel_orientation_quirks virtio_ring virtio
[  128.869013] CPU: 2 PID: 0 Comm: swapper/2 Kdump: loaded Tainted: G           OE  ------------   3.10.0-957.12.2.el7.x86_64 #1
[  128.869056] Hardware name: Red Hat KVM, BIOS Bochs 01/01/2011
[  128.869078] task: ffff93543949d140 ti: ffff9354394b4000 task.ti: ffff9354394b4000
[  128.869082] RIP: 0010:[<ffffffffc05f4a45>]  [<ffffffffc05f4a45>] request_timer_fn+0x6a5/0x840 [drbd]
[  128.869082] RSP: 0018:ffff93543fd03df0  EFLAGS: 00010046
[  128.869082] RAX: ffff935437691000 RBX: 0000000000000000 RCX: 0000000000000001
[  128.869082] RDX: 0000000000000000 RSI: 0000000000000046 RDI: ffffffffc06324e8
[  128.869082] RBP: ffff93543fd03e60 R08: 0000000000000000 R09: 0000000000000003
[  128.869082] R10: 0000000000000226 R11: 0000000000000280 R12: ffff9354376921a8
[  128.869082] R13: 00000000fffd6384 R14: 0000000000000000 R15: ffff9354376921a8
[  128.869082] FS:  0000000000000000(0000) GS:ffff93543fd00000(0000) knlGS:0000000000000000
[  128.869082] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  128.869082] CR2: 0000000000000098 CR3: 000000002c210000 CR4: 00000000001606e0
[  128.869082] Call Trace:
[  128.869082]  <IRQ> 
[  128.869082]  [<ffffffff9a4c49d1>] ? run_posix_cpu_timers+0x51/0x830
[  128.869082]  [<ffffffffc05f43a0>] ? drbd_merge_bvec+0x2b0/0x2b0 [drbd]
[  128.869082]  [<ffffffff9a4a8048>] call_timer_fn+0x38/0x110
[  128.869082]  [<ffffffffc05f43a0>] ? drbd_merge_bvec+0x2b0/0x2b0 [drbd]
[  128.869082]  [<ffffffff9a4aa4ad>] run_timer_softirq+0x24d/0x300
[  128.869082]  [<ffffffff9a4a0ff5>] __do_softirq+0xf5/0x280
[  128.869082]  [<ffffffff9ab7932c>] call_softirq+0x1c/0x30
[  128.869082]  [<ffffffff9a42e675>] do_softirq+0x65/0xa0
[  128.869082]  [<ffffffff9a4a1375>] irq_exit+0x105/0x110
[  128.869082]  [<ffffffff9ab7a6e8>] smp_apic_timer_interrupt+0x48/0x60
[  128.869082]  [<ffffffff9ab76df2>] apic_timer_interrupt+0x162/0x170
[  128.869082]  <EOI> 
[  128.869082]  [<ffffffff9ab6ac70>] ? __cpuidle_text_start+0x8/0x8
[  128.869082]  [<ffffffff9ab6ae9b>] ? native_safe_halt+0xb/0x20
[  128.869082]  [<ffffffff9ab6ac8e>] default_idle+0x1e/0xc0
[  128.869082]  [<ffffffff9a4366f0>] arch_cpu_idle+0x20/0xc0
[  128.869082]  [<ffffffff9a4fc65a>] cpu_startup_entry+0x14a/0x1e0
[  128.869082]  [<ffffffff9a457ff7>] start_secondary+0x1f7/0x270
[  128.869082]  [<ffffffff9a4000d5>] start_cpu+0x5/0x14
[  128.869082] Code: ff 44 89 45 b8 48 8b 30 31 c0 e8 5e 7e 56 da 49 8b 87 58 fe ff ff 41 8b 8f 04 ff ff ff 48 c7 c7 e8 24 63 c0 41 8b 97 00 ff ff ff <4c> 8b a3 98 00 00 00 48 8b 30 31 c0 e8 31 7e 56 da 49 8b 87 58 
[  128.869082] RIP  [<ffffffffc05f4a45>] request_timer_fn+0x6a5/0x840 [drbd]
[  128.869082]  RSP <ffff93543fd03df0>
[  128.869082] CR2: 0000000000000098


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