<div dir="ltr"><div style>Hello,</div><div style><br></div><div style>I am running DRBD 8.4.2 on a pair of Centos6 hosts. When I start DRBD on either of these hosts while running kernel version 2.6.32-279.19.1.el6.i686, the system will panic and display the below error messages. DRBD runs normally on these systems with kernel versions 2.6.32-279.5.2.el6.i686 and lower. </div>
<div style><br></div><div style>Strangely, I have a different pair of servers running DRBD 8.4.2 without problem using kernel version 2.6.32-279.19.1.el6.x86_64.</div><div style><br></div><div style>Any thoughts?</div><div style>
<br></div><div style>Thanks!</div><div style>-Ryan</div><div style><br></div><div style>---- Error messages follow ------</div><div>Jan 14 12:53:34 itchy lrmd: [1565]: info: rsc:drbd0:0:13: start<br></div><div>Jan 14 12:53:34 itchy kernel: events: mcg drbd: 2</div>
<div>Jan 14 12:53:34 itchy kernel: BUG: unable to handle kernel NULL pointer dereference at 00000aeb</div><div>Jan 14 12:53:34 itchy kernel: IP: [<c04edaef>] get_page_from_freelist+0x1f/0x580</div><div>Jan 14 12:53:34 itchy kernel: *pdpt = 0000000035ad1001 *pde = 00000000f63bb067 </div>
<div>Jan 14 12:53:34 itchy kernel: Oops: 0000 [#1] SMP </div><div>Jan 14 12:53:34 itchy kernel: last sysfs file: /sys/devices/pci0000:00/0000:00:1e.0/0000:03:03.0/irq</div><div>Jan 14 12:53:34 itchy kernel: Modules linked in: drbd(+)(U) libcrc32c ipt_LOG nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_multiport iptable_filter ip_tables ip6t_REJECT ip6t_LOG xt_limit ip6table_filter ip6_tables ipv6 sunrpc e1000 microcode dcdbas serio_raw i2c_i801 i2c_core sg i6300esb ext4 mbcache jbd2 raid1 sr_mod cdrom sd_mod crc_t10dif pata_acpi ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]</div>
<div>Jan 14 12:53:34 itchy kernel: </div><div>Jan 14 12:53:34 itchy kernel: Pid: 2278, comm: modprobe Not tainted 2.6.32-279.19.1.el6.i686 #1 Dell Computer Corporation PowerEdge 750 /0R1479</div><div>Jan 14 12:53:34 itchy kernel: EIP: 0060:[<c04edaef>] EFLAGS: 00010292 CPU: 0</div>
<div>Jan 14 12:53:34 itchy kernel: EIP is at get_page_from_freelist+0x1f/0x580</div><div>Jan 14 12:53:34 itchy kernel: EAX: ffffffff EBX: 00000000 ECX: 00000000 EDX: f443fe9c</div><div>Jan 14 12:53:34 itchy kernel: ESI: 00000002 EDI: 0000818e EBP: c0a768e0 ESP: f443fe4c</div>
<div>Jan 14 12:53:34 itchy kernel: DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068</div><div>Jan 14 12:53:34 itchy kernel: Process modprobe (pid: 2278, ti=f443e000 task=c15e2550 task.ti=f443e000)</div><div>Jan 14 12:53:34 itchy kernel: Stack:</div>
<div>Jan 14 12:53:34 itchy kernel: 00000010 c04b7c55 c045c3fe a478e900 00000049 a469ad13 00000000 a478e900</div><div>Jan 14 12:53:34 itchy kernel: <0> 000200d2 c0b10360 00000000 0000000a c3a04464 00000000 00000046 000000d0</div>
<div>Jan 14 12:53:34 itchy kernel: <0> 00000046 00000046 0000000d c0a746a0 c1f78d20 00000000 00000002 0000818e</div><div>Jan 14 12:53:34 itchy kernel: Call Trace:</div><div>Jan 14 12:53:34 itchy kernel: [<c04b7c55>] ? rcu_process_callbacks+0x35/0x40</div>
<div>Jan 14 12:53:34 itchy kernel: [<c045c3fe>] ? __do_softirq+0xae/0x1a0</div><div>Jan 14 12:53:34 itchy kernel: [<c04eea94>] ? __alloc_pages_nodemask+0xf4/0x870</div><div>Jan 14 12:53:34 itchy kernel: [<c04e05d6>] ? mempool_create_node+0x36/0xc0</div>
<div>Jan 14 12:53:34 itchy kernel: [<c04e0240>] ? mempool_alloc_slab+0x0/0x10</div><div>Jan 14 12:53:34 itchy kernel: [<c04e0230>] ? mempool_free_slab+0x0/0x10</div><div>Jan 14 12:53:34 itchy kernel: [<c04e061d>] ? mempool_create_node+0x7d/0xc0</div>
<div>Jan 14 12:53:34 itchy kernel: [<f8747000>] ? init_module+0x0/0x20e [drbd]</div><div>Jan 14 12:53:34 itchy kernel: [<f871e56d>] ? drbd_create_mempools+0x1dd/0x210 [drbd]</div><div>Jan 14 12:53:34 itchy kernel: [<f87470aa>] ? init_module+0xaa/0x20e [drbd]</div>
<div>Jan 14 12:53:34 itchy kernel: [<c040303f>] ? do_one_initcall+0x2f/0x1c0</div><div>Jan 14 12:53:34 itchy kernel: [<c04915a4>] ? sys_init_module+0xb4/0x220</div><div>Jan 14 12:53:34 itchy kernel: [<c052a711>] ? sys_read+0x41/0x70</div>
<div>Jan 14 12:53:34 itchy kernel: [<c082d684>] ? syscall_call+0x7/0xb</div><div>Jan 14 12:53:34 itchy kernel: Code: 24 28 83 c4 2c c3 8d b6 00 00 00 00 55 57 56 53 83 ec 54 89 44 24 20 8b 44 24 74 89 54 24 34 8d 54 24 50 89 4c 24 18 8b 4c 24 34 <2b> 80 ec 0a 00 00 89 14 24 8b 54 24 6c c1 f8 06 69 c0 a5 4f fa </div>
<div>Jan 14 12:53:34 itchy kernel: EIP: [<c04edaef>] get_page_from_freelist+0x1f/0x580 SS:ESP 0068:f443fe4c</div><div>Jan 14 12:53:34 itchy kernel: CR2: 0000000000000aeb</div><div>Jan 14 12:53:34 itchy kernel: ---[ end trace 7ceb0e7f8f072fe8 ]---</div>
<div>Jan 14 12:53:34 itchy kernel: Kernel panic - not syncing: Fatal exception</div><div>Jan 14 12:53:34 itchy kernel: Pid: 2278, comm: modprobe Tainted: G D --------------- 2.6.32-279.19.1.el6.i686 #1</div><div>
Jan 14 12:53:34 itchy kernel: Call Trace:</div><div><br></div>-- <br><div style="margin:0px;color:rgb(48,70,157);font-family:Verdana;font-size:9px"><span style="letter-spacing:0px"><b>Ryan C Shannon | Senior System Administrator |<span> </span></b><a href="http://www.visionlink.org/" style="color:rgb(42,93,176)" target="_blank"><span style="text-decoration:underline"><b>VisionLink, Inc.</b></span></a><b> </b></span></div>
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