[uml-devel] backtrace of uml crash on mysql-server start

[uml-devel] backtrace of uml crash on mysql-server start

[Sebastian Böhm]

Hi,

finally I was able to produce this stracktrace with 2.4.26-um1 (host 
also 2.4.26)
It happend during a mysql-server start. (I can reproduce this quite 
constant, if you have further questions ...)

maybe something with ipc ?




Breakpoint 1, panic (fmt=0x0) at panic.c:58
58              machine_paniced = 1;
(gdb) bt
#0  panic (fmt=0x0) at panic.c:58
#1  0xa008e04b in segv (address=28, ip=1818324839, is_write=2, is_user=0,
    sc=0x0) at trap_kern.c:144
#2  0xa008e3d7 in segv_handler (sig=11, regs=0xa13ec274) at trap_user.c:67
#3  0xa0090ea4 in sig_handler_common_skas (sig=11, sc_ptr=0x58)
    at trap_user.c:35
#4  0xa008e408 in sig_handler (sig=0, sc=
      {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 43, __esh = 0, ds = 
43, __dsh = 0, edi = 2, esi = 28, ebp = 2705260500, esp = 2705260428, 
ebx = 0, edx = 0, ecx = 2684354560, eax = 28, trapno = 14, err = 6, eip 
= 2684935257, cs = 35, __csh = 0, eflags = 66194, esp_at_signal = 
2705260428, ss = 43, __ssh = 0, fpstate = 0x0, oldmask = 134217728, cr2 
= 28}) at trap_user.c:101
#5  <signal handler called>
#6  0xa008dc59 in handle_page_fault (address=1881171332, ip=0, is_write=2,
    is_user=0, code_out=0xa13f0024) at rwsem.h:101
#7  0xa008df56 in segv (address=1881171332, ip=0, is_write=2, is_user=0,
    sc=0x1c) at trap_kern.c:133
#8  0xa008e3d7 in segv_handler (sig=11, regs=0xa13f0274) at trap_user.c:67
#9  0xa0090ea4 in sig_handler_common_skas (sig=11, sc_ptr=0x58)
    at trap_user.c:35
#10 0xa008e408 in sig_handler (sig=28, sc=
      {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 43, __esh = 0, ds = 
43, __dsh = 0, edi = 0, esi = 1881171332, ebp = 2705261644, esp = 
2705261572, ebx = 188117---Type <return> to continue, or q <return> to 
quit---

/sebastian


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Re: [uml-devel] backtrace of uml crash on mysql-server start

[BlaisorBlade]

Alle 22:24, sabato 26 giugno 2004, Sebastian Böhm ha scritto:
> Hi,
>
> finally I was able to produce this stracktrace with 2.4.26-um1 (host
> also 2.4.26)
> It happend during a mysql-server start. (I can reproduce this quite
> constant, if you have further questions ...)

Very well, a reproducible crash is very important.

> maybe something with ipc ?


> Breakpoint 1, panic (fmt=0x0) at panic.c:58
> 58              machine_paniced = 1;
> (gdb) bt

> #10 0xa008e408 in sig_handler (sig=28, sc=
>       {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 43, __esh = 0, ds =
> 43, __dsh = 0, edi = 0, esi = 1881171332, ebp = 2705261644, esp =
> 2705261572, ebx = 188117


Eeeh?

> ---Type <return> to continue, or q <return> to quit---

Aargh! Why did not you type <return> here? The backtrace still continues, and 
the part you posted is the least significant one (though there is already 
something strange - a panic onto a panic - but not yet enough). It's like a 
joke from the fate....

Just post the *complete* backtrace and I'll be able to start to analyze the 
bug.
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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Re: [uml-devel] backtrace of uml crash on mysql-server start

[BlaisorBlade]

Alle 22:32, domenica 27 giugno 2004, Sebastian Böhm ha scritto:
> BlaisorBlade wrote:
> Can I exit gdb now ? Or is there something more ?
Well, maybe you can. There is a patch onto the ML (not from me), with this 
title:

[uml-devel] Patch for arch/um/kernel/trap_kern.c to fix bad panic

And I think it could fix exactly your problem. At least, retry with that 
applied; and say me whether things become safe or not. However, I'm not sure 
it does relate to that bug.

> I posted the complete output to user-mode-linux-devel, did you noticed that 
?

I received all your mails, now, but I'm not always online so when I wrote that 
mail I hadn't it yet.

Bye
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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