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SubjectRe: Oopses in scheduler on Linux-2.4.17-xfs
Andrew Morton schrieb:
>
> Peter Wächtler wrote:
> >
> > I recently get oopses on 2.4.14-xfs and 2.4.17-xfs.
> > box is SMP with old Pentium Pro
>
> Could I please have a description of your hardware? lspci output,
> lsmod, .config?
>
> Thanks.

The machins crashed again in the morning:
To me it seems that a process lost its stack?

Hmh, now I missed to dump the task_struct, right?
How can I better track this bug next time?

would a memory dump of the task_struct help? How to do this?
md <what_address>?


[0]kdb> bt
EBP EIP Function(args)
0xcdc9dfbc 0xc0113db0 schedule+0x248 (0xf, 0x20, 0x27, 0x809e780, 0x1b)
kernel .text 0xc0100000 0xc0113b68 0xc01140e8
0xc0106f29 reschedule+0x5
kernel .text 0xc0100000 0xc0106f24 0xc0106f30

[0]kdb> bta
Stack traceback for pid 1
[...]
Stack traceback for pid 787
EBP EIP Function(args)
0xcdc9c000 0xc0113db0 schedule+0x248 (0xf, 0x20, 0x27, 0x809e780, 0x1b)
kernel .text 0xc0100000 0xc0113b68 0xc01140e8
0xc0106f29 reschedule+0x5
kernel .text 0xc0100000 0xc0106f24 0xc0106f30
Enter <q> to end, <cr> to continue:

Stack traceback for pid 2093
Stack is not in task_struct, backtrace not available
Enter <q> to end, <cr> to continue:
Stack traceback for pid 2095
EBP EIP Function(args)
[...]

Enter <q> to end, <cr> to continue:
[0]kdb> ps
Task Addr Pid Parent [*] cpu State Thread Command
[..]
0xcdc9c000 00000787 00000777 1 000 run 0xcdc9c370*setiathome
[..]
0xc4248000 00002093 00001978 1 001 run 0xc4248370 setiathome


[0]kdb> go
Oops: 0000
CPU: 0
EIP: 0010:[<c0113db0>] Not tainted
EFLAGS: 00010207
eax: f9647971 ebx: 00000014 ecx: 1a6e124d edx: 069b8298
esi: cdc9c000 edi: 0000001b ebp: cdc9dfbc esp: cdc9df88
ds: 0018 es: 0018 ss: 0018
Process setiathome (pid: 787, stackpage=cdc9d000)
Stack: cdc9c000 0809e780 0000001b cffeef44 c02c11c0 cdc9c000 00000000 00000001
00000001 00000000 00000000 cdc9c000 c03148e0 bfffedec c0106f29 0000000f
00000020 00000027 0809e780 0000001b bfffedec 00000001 0000002b 0000002b
Call Trace: [<c0106f29>]

Code: 8b 51 20 d1 fa 89 d8 2b 41 24 c1 f8 02 8d 54 10 01 89 51 20
<6>SysRq : Emergency Sync
SysRq : Emergency Remount R/O
SysRq : Resetting


ksymoops 2.4.2 on i686 2.4.17-xfs. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.17-xfs/ (default)
-m /boot/System.map-2.4.17-xfs (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

Oops: 0000
CPU: 0
EIP: 0010:[<c0113db0>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010207
eax: f9647971 ebx: 00000014 ecx: 1a6e124d edx: 069b8298
esi: cdc9c000 edi: 0000001b ebp: cdc9dfbc esp: cdc9df88
ds: 0018 es: 0018 ss: 0018
Process setiathome (pid: 787, stackpage=cdc9d000)
Stack: cdc9c000 0809e780 0000001b cffeef44 c02c11c0 cdc9c000 00000000 00000001
00000001 00000000 00000000 cdc9c000 c03148e0 bfffedec c0106f29 0000000f
00000020 00000027 0809e780 0000001b bfffedec 00000001 0000002b 0000002b
Call Trace: [<c0106f29>]
Code: 8b 51 20 d1 fa 89 d8 2b 41 24 c1 f8 02 8d 54 10 01 89 51 20

>>EIP; c0113db0 <schedule+248/580> <=====
Trace; c0106f28 <reschedule+4/c>
Code; c0113db0 <schedule+248/580>
00000000 <_EIP>:
Code; c0113db0 <schedule+248/580> <=====
0: 8b 51 20 mov 0x20(%ecx),%edx <=====
Code; c0113db2 <schedule+24a/580>
3: d1 fa sar %edx
Code; c0113db4 <schedule+24c/580>
5: 89 d8 mov %ebx,%eax
Code; c0113db6 <schedule+24e/580>
7: 2b 41 24 sub 0x24(%ecx),%eax
Code; c0113dba <schedule+252/580>
a: c1 f8 02 sar $0x2,%eax
Code; c0113dbc <schedule+254/580>
d: 8d 54 10 01 lea 0x1(%eax,%edx,1),%edx
Code; c0113dc0 <schedule+258/580>
11: 89 51 20 mov %edx,0x20(%ecx)


1 warning issued. Results may not be reliable.
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