Re: Re: kswapd OOPS under 2.4.19-pre8 (ext3, Reiserfs + (soft)raid0)

[Todd R. Eigenschink]

Todd R. Eigenschink writes:
>Mike Galbraith writes:
>>Methinks there's an easier way to get to the line in question.  Compile sched.c with -g via make kernel/sched.o EXTRA_CFLAGS=-g.. gbd can then be used to get you the line with list *__wake_up+0xb2.

Since the particular snippet of code at the point of oops in the last
one I posted was P3-specified, I recompiled for 586.  The oops remains
the same, although the call stack happens to be a lot longer this
time.

I'm going to run memtest86 on it for a while after it gets done with
its morning processing, although this failure seems a little too
consistent to be memory related.

Trace; c0129b39 <unlock_page+81/88>
Trace; c0139179 <end_buffer_io_async+8d/a8>
Trace; c01b6f45 <end_that_request_first+65/c8>
Trace; c01c1c3c <ide_end_request+68/a8>
Trace; c01c806a <ide_dma_intr+6a/ac>
Trace; c01c38ad <ide_intr+f9/164>
Trace; c01c8000 <ide_dma_intr+0/ac>
Trace; c010a1e1 <handle_IRQ_event+59/84>
Trace; c010a3d9 <do_IRQ+a9/f4>
Trace; c010c568 <call_do_IRQ+5/d>
Trace; c0154b07 <statm_pgd_range+133/1a8>
Trace; c0154c43 <proc_pid_statm+c7/16c>
Trace; c015279e <proc_info_read+5a/118>
Trace; c0137497 <sys_read+8f/104>
Trace; c0108a43 <system_call+33/40>

Code;  c0116383 <__wake_up+3b/c0>
00000000 <_EIP>:
Code;  c0116383 <__wake_up+3b/c0>   <=====
   0:   8b 01                     mov    (%ecx),%eax   <=====
Code;  c0116385 <__wake_up+3d/c0>
   2:   85 45 fc                  test   %eax,0xfffffffc(%ebp)
Code;  c0116388 <__wake_up+40/c0>
   5:   74 66                     je     6d <_EIP+0x6d> c01163f0 <__wake_up+a8/c
0>
Code;  c011638a <__wake_up+42/c0>
   7:   31 d2                     xor    %edx,%edx
Code;  c011638c <__wake_up+44/c0>
   9:   9c                        pushf  
Code;  c011638d <__wake_up+45/c0>
   a:   5e                        pop    %esi
Code;  c011638e <__wake_up+46/c0>
   b:   fa                        cli    
Code;  c011638f <__wake_up+47/c0>
   c:   f0 fe 0d 80 99 30 c0      lock decb 0xc0309980
Code;  c0116396 <__wake_up+4e/c0>
  13:   0f 00 00                  sldtl  (%eax)

(gdb) list *__wake_up+0x3b
0x96f is in __wake_up (kernel/sched.c:732).
727                     wait_queue_t *curr = list_entry(tmp, wait_queue_t, task_list);
728
729                     CHECK_MAGIC(curr->__magic);
730                     p = curr->task;
731                     state = p->state;
732                     if (state & mode) {
733                             WQ_NOTE_WAKER(curr);
734                             if (try_to_wake_up(p, sync) && (curr->flags&WQ_FLAG_EXCLUSIVE) && !--nr_exclusive)
735                                     break;
736                     }