2.6.10-rc2-bk13/16: Oops on Dual Opteron 246: Unable to handle kernel NULL pointer dereference

["Alexander Y. Fomichev" <gluk@php4.ru>]

G'day


Happens at attempt to defragment InnoDB datafile by xfs_fsr.

lights innodb # xfs_fsr ib_logfile1 (of ~5G size)
(all & only innodb-related files lie on the xfs partition)

Hardware Environment: Dual Opteron 246 / Iwill DK8S2 [AMD-8111] / 4G RAM/ LSI 
320-2X

Software Environment:[ 2.6.10-rc2-bk13/16 reiserfs(mount as root),xfs ],
gcc (GCC) 3.4.3  (Gentoo Linux 3.4.3, ssp-3.4.3-0, pie-8.7.6.6), glibc-2.3.4,
xfs_fsr, mysql(with InnoDB)

Btw, I couldn't find any xfs staff in trace, and it seems
reiserfs related more here. Oops 100% repeatable for us
with 2.6.10-rc2-bk13 and 2.6.10-rc2-bk16

I send it to bugzilla.kernel.org:
http://bugme.osdl.org/show_bug.cgi?id=3854

Here is a trace (ksymoopsed)

lights root # Unable to handle kernel NULL pointer dereference at 
0000000000000019 RIP: 
<ffffffff801ca91c>{write_ordered_buffers+76}
PML4 e7bf3067 PGD e70bd067 PMD 0 
Oops: 0002 [1] PREEMPT SMP 
CPU 1 
Pid: 160, comm: pdflush Not tainted 2.6.10-rc2-bk16
RIP: 0010:[<ffffffff801ca91c>] <ffffffff801ca91c>{write_ordered_buffers+76}
Using defaults from ksymoops -t elf64-x86-64 -a i386:x86-64
RSP: 0000:000001007fe35b58  EFLAGS: 00010293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 000001003b766910
RDX: 000000000000000c RSI: 000001007c8aa5b0 RDI: 000001007fe35b68
RBP: 000001005cb08ca8 R08: 0000000000000000 R09: 0000010002b41f28
R10: 0000010046497540 R11: ffffffff802965d0 R12: ffffff00000a1168
R13: 0000000000000000 R14: 000001007fe35b58 R15: 0000000000022f98
FS:  0000002a958624a0(0000) GS:ffffffff80464800(0000) knlGS:0000000000000000
CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000019 CR3: 00000000f6f82000 CR4: 00000000000006e0
Stack: 000001003c3ce570 000001003df69f30 000001007c8aa190 000001007c8aa1e8 
       000001007c8aa240 000001007c8aa298 000001007c8aa2f0 000001007c8aa348 
       000001007c8aa3a0 000001007c8aa3f8 
Call Trace:<ffffffff801cb0e5>{flush_commit_list+421} 
<ffffffff801cf109>{do_journal_end+3129} 
       <ffffffff80325d0e>{schedule_timeout+174} 
<ffffffff80147a70>{keventd_create_kthread+0} 
       <ffffffff801bc540>{reiserfs_write_super+64} 
<ffffffff80179d70>{sync_supers+128} 
       <ffffffff8015727a>{wb_kupdate+42} <ffffffff80157f53>{pdflush+323} 
       <ffffffff80157250>{wb_kupdate+0} <ffffffff80157e10>{pdflush+0} 
       <ffffffff80147a29>{kthread+217} <ffffffff8010e057>{child_rip+8} 
       <ffffffff80147a70>{keventd_create_kthread+0} 
<ffffffff80147950>{kthread+0} 
       <ffffffff8010e04f>{child_rip+0} 
Code: f0 ff 43 18 f0 0f ba 2b 02 19 c0 85 c0 0f 84 91 00 00 00 8b 


>>RIP; ffffffff801ca91c <write_ordered_buffers+4c/250>   <=====

>>R11; ffffffff802965d0 <as_merged_request+0/1d0>

Trace; ffffffff801cb0e5 <flush_commit_list+1a5/580>
Trace; ffffffff80325d0e <schedule_timeout+ae/d0>
Trace; ffffffff801bc540 <reiserfs_write_super+40/80>
Trace; ffffffff8015727a <wb_kupdate+2a/130>
Trace; ffffffff80157250 <wb_kupdate+0/130>
Trace; ffffffff80147a29 <kthread+d9/120>
Trace; ffffffff80147a70 <keventd_create_kthread+0/60>
Trace; ffffffff8010e04f <child_rip+0/11>

Code;  ffffffff801ca91c <write_ordered_buffers+4c/250>
0000000000000000 <_RIP>:
Code;  ffffffff801ca91c <write_ordered_buffers+4c/250>   <=====
   0:   f0 ff 43 18               lock incl 0x18(%rbx)   <=====
Code;  ffffffff801ca920 <write_ordered_buffers+50/250>
   4:   f0 0f ba 2b 02            lock btsl $0x2,(%rbx)
Code;  ffffffff801ca925 <write_ordered_buffers+55/250>
   9:   19 c0                     sbb    %eax,%eax
Code;  ffffffff801ca927 <write_ordered_buffers+57/250>
   b:   85 c0                     test   %eax,%eax
Code;  ffffffff801ca929 <write_ordered_buffers+59/250>
   d:   0f 84 91 00 00 00         je     a4 <_RIP+0xa4>
Code;  ffffffff801ca92f <write_ordered_buffers+5f/250>
  13:   8b 00                     mov    (%rax),%eax

CR2: 0000000000000019

________________________________________________
.config => http://sysadminday.org.ru/3854/config

-- 
Best regards.
        Alexander Y. Fomichev <gluk@php4.ru>
        Public PGP key: http://sysadminday.org.ru/gluk.asc