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SubjectRe: [2.4.28-rc1] process stuck in release_task() call

Hi Andrey,

On Tue, Nov 09, 2004 at 07:24:45PM +0300, Andrey J. Melnikoff (TEMHOTA) wrote:
> Hello!
>
> With 2.4.28-pre3 and 2.4.28-rc1 i see strange situation - sendmail some
> times get stuck into release_task() call.
>
> System - Tyan Tiger MPX, dual Athlon MP 2800+ with 1Gb memory.
>
> --- SysRq-T output ---
> ksymoops 2.4.9 on i686 2.4.28-rc1. Options used
> -V (default)
> -k /proc/ksyms (default)
> -l /proc/modules (default)
> -o /lib/modules/2.4.28-rc1/ (default)
> -m /boot/System.map-2.4.28-rc1 (default)
>
> Reading Oops report from the terminal
> sendmail S C012073D 0 15814 1 32701 14365 (NOTLB)
> Using defaults from ksymoops -t elf32-i386 -a i386
> Call Trace: [<c012073d>] [<c0106582>] [<c0107717>]
> sendmail Z 00000000 4 30459 15814 30669 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c011547d>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 0 30669 15814 30707 30459 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 4 30707 15814 31549 30669 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 2624 31549 15814 31708 30707 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 0 31708 15814 32269 31549 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 0 32269 15814 32352 31708 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 20 32352 15814 32403 32269 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 0 32403 15814 32413 32352 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 624 32413 15814 32468 32403 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 0 32468 15814 32473 32413 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 0 32473 15814 32482 32468 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> sendmail Z 00000000 0 32482 15814 32499 32473 (L-TLB)
> Call Trace: [<c0120f53>] [<c0121600>] [<c0121725>] [<c0107717>]
> ..... many sendmail zombies ......
>
> Warning (Oops_read): Code line not seen, dumping what data is available
>
> Proc; sendmail
>
> >>EIP; c012073d <release_task+1fd/230> <=====
>
> Trace; c012073d <release_task+1fd/230>
> Trace; c0106582 <sys_rt_sigsuspend+122/160>
> Trace; c0107717 <system_call+33/38>
> Proc; sendmail
>
> >>EIP; 00000000 Before first symbol
>
> Trace; c0120f53 <exit_notify+103/3c0>
> Trace; c0121600 <do_exit+3f0/4e0>
> Trace; c011547d <smp_apic_timer_interrupt+12d/130>
> Trace; c0121725 <sys_exit+15/20>
> Trace; c0107717 <system_call+33/38>
> Proc; sendmail
>
> >>EIP; 00000000 Before first symbol
>
> Trace; c0120f53 <exit_notify+103/3c0>
> Trace; c0121600 <do_exit+3f0/4e0>
> Trace; c0121725 <sys_exit+15/20>
> Trace; c0107717 <system_call+33/38>
> Proc; sendmail
>
> .... same trace with other zombies ......
>
>
> disassemble show other result - process stuck into free_pages() call:
>
> c0120540 <release_task>:
> c0120540: 55 push %ebp
> ....
> c0120736: 89 d8 mov %ebx,%eax
> c0120738: e8 73 dd 01 00 call c013e4b0 <free_pages> <= here

is this release_task+1fd? Can you send me the full disassemble of release_task?

It can't be blocked here, its a "call" instruction.

free_pages can't block either. Odd.

It is reproducible?

First wild guess (because I haven't got much of a clue really)
would be to revert the mm/page_alloc.c __free_pages() "fastcall"
gcc3.4 change.
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