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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:maroon'>This particular crash was fixed in the trunk a while back – it is
caused by the fact that sometimes the ack for a block is received before the send
routine has actually finished which leads to the send routine attempting to
touch freed data.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:maroon'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:maroon'>Remember – version 8 is not production ready yet! I’ll let
Philipp/Lars answer the obvious follow-on question…<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:maroon'>Simon<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif";
color:maroon'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span style='font-size:9.0pt;font-family:"Segoe UI","sans-serif"'>From:</span></b><span
style='font-size:9.0pt;font-family:"Segoe UI","sans-serif"'>
drbd-user-bounces@linbit.com [mailto:drbd-user-bounces@linbit.com] <b>On Behalf
Of </b>Igor Morgado<br>
<b>Sent:</b> Wednesday, September 13, 2006 3:49 PM<br>
<b>To:</b> drbd-user@linbit.com<br>
<b>Subject:</b> [DRBD-user] Re: oops on drbd + lvm<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>This happend while writing on
filesystem over the drbd device.<br>
<br>
<o:p></o:p></p>
<div>
<p class=MsoNormal><span class=gmailquote>On 9/13/06, <b>Igor Morgado</b> <<a
href="mailto:igormorgado.listas@gmail.com">igormorgado.listas@gmail.com </a>>
wrote:</span><o:p></o:p></p>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>Any ideas?<br>
<br>
Sep 13 16:01:22 magratea kernel: drbd5: in got_BlockAck:2795: ap_pending_cnt =
-1 < 0 ! <br>
Sep 13 16:01:23 magratea last message repeated 5 times<br>
Sep 13 16:01:27 magratea kernel: drbd4: in got_BlockAck:2795: ap_pending_cnt =
-1 < 0 ! <br>
Sep 13 16:01:30 magratea kernel: drbd4: in got_BlockAck:2795: ap_pending_cnt =
-1 < 0 !<br>
Sep 13 16:01:30 magratea kernel: Unable to handle kernel NULL pointer
dereference at virtual address 00000000<br>
Sep 13 16:01:30 magratea kernel: printing eip: <br>
Sep 13 16:01:30 magratea kernel: c13e8c60<br>
Sep 13 16:01:30 magratea kernel: *pde = ma 00000000 pa fffff000<br>
Sep 13 16:01:30 magratea kernel: Oops: 0000 [#1]<br>
Sep 13 16:01:30 magratea kernel: SMP<br>
Sep 13 16:01:30 magratea kernel: Modules linked in: drbd xt_physdev
iptable_filter ip_tables x_tables ipv6 bridge megaraid ext2 mbcache dm_mod
ide_disk evdev sg psmouse hw_random serio_raw shpchp floppy rtc pci_hotplug
pcspkr serial_core xfs exportfs ide_cd cdrom sd_mod piix megaraid_mbox scsi_mod
ehci_hcd generic uhci_hcd ide_core tg3 usbcore megaraid_mm thermal processor
fan <br>
Sep 13 16:01:30 magratea kernel: CPU: 0<br>
Sep 13 16:01:30 magratea kernel: EIP:
0061:[<c13e8c60>] Not tainted VLI<br>
Sep 13 16:01:30 magratea kernel: EFLAGS: 00010286 (2.6.16-2-xen-686
#1)<br>
Sep 13 16:01:30 magratea kernel: EIP is at _drbd_send_page+0x20/0xfe [drbd] <br>
Sep 13 16:01:30 magratea kernel: eax: b0000000 ebx:
b0730aec ecx: bc5a8000 edx: 00000000<br>
Sep 13 16:01:30 magratea kernel: esi: b1013440 edi:
00001000 ebp: 00000000 esp: bc5a9f14<br>
Sep 13 16:01:30 magratea kernel: ds: 007b es: 007b ss:
0069 <br>
Sep 13 16:01:30 magratea kernel: Process drbd4_worker (pid: 20693,
threadinfo=bc5a8000 task=b0edf030)<br>
Sep 13 16:01:30 magratea kernel: Stack: <0>b0000000 b0730aec 00000001
bafe8380 be885010 c13e8d64 be885010 00000000 <br>
Sep 13 16:01:30 magratea kernel:
00001000 b1013440 bf73df98 00000000 00000001 be885010 c13e8ee9 be885010<br>
Sep 13 16:01:30 magratea kernel:
bafe8380 bafe8380 00000000 67027483 18100000 00000000 a8491c00 bf73df98 <br>
Sep 13 16:01:30 magratea kernel: Call Trace:<br>
Sep 13 16:01:30 magratea kernel: [<c13e8d64>]
_drbd_send_zc_bio+0x26/0x47 [drbd]<br>
Sep 13 16:01:30 magratea kernel: [<c13e8ee9>]
drbd_send_dblock+0x164/0x17c [drbd] <br>
Sep 13 16:01:30 magratea kernel: [<c13daee6>]
w_send_dblock+0xbc/0x1d3 [drbd]<br>
Sep 13 16:01:30 magratea kernel: [<c13dbca1>]
drbd_worker+0x1cd/0x430 [drbd]<br>
Sep 13 16:01:30 magratea kernel: [<c13e7f79>]
drbd_thread_setup+0xa2/0xd1 [drbd] <br>
Sep 13 16:01:30 magratea kernel: [<c13e7ed7>]
drbd_thread_setup+0x0/0xd1 [drbd]<br>
Sep 13 16:01:30 magratea kernel: [<b0102bf5>]
kernel_thread_helper+0x5/0xb<br>
Sep 13 16:01:30 magratea kernel: Code: 7c d2 ee 83 c4 18 89 d8 5b 5e c3 55 b9
00 e0 ff ff 57 56 53 53 8b 6c 24 1c 21 e1 8b 41 18 8b 74 24 24 8b 7c 24 20 89
04 24 89 ea <8b> 45 00 89 f3 f6 c4 40 74 03 8b 55 0c 8b 42 04 40 85 c0 7e
07 <br>
<br>
Version: 8.0pre4 (api:83)<br>
SVN Revision: 2267 build by root@magratea, 2006-07-07 12:45:01<br>
<br>
LVM version: 2.02.02 (2006-02-07)<br>
Library version: 1.02.03 (2006-02-08)<br>
Driver version: 4.5.0<br>
<br>
Linux magratea 2.6.16-2-xen-686 #1 SMP Tue May 23 05:46:45 CEST 2006 i686
GNU/Linux<br>
<br>
<br>
<o:p></o:p></p>
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