Re: 2.6.26 kernel crash

[Helge Deller <deller@gmx.de>]

On Sunday 20 July 2008, Helge Deller wrote:
> While debugging some user-space stuff I just faced this 32bit kernel crash (2.6.26):
> Maybe someone has an idea?

This is reproduceable.
Testcase and docu is here: http://gsyprf10.external.hp.com/~deller/crash.tgz

Just run:
LD_LIBRARY_PATH=.  ./a.out

Output is:
making contexts
swapping contexts
start f2
&on_stack=0x12d88
start f1(a0=1,a1=2,a2=3,a3=fffffffc)
<crash>

Info:
- test program is from glibc:
        glibc-2.7/stdlib/tst-setcontext.c
- the compiled libc.so.6 includes some changes for *context() functions from me.

 
> Kernel Fault: Code=15 regs=5f578640 (Addr=000127ec)
> 
>      YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
> PSW: 00000000000001001111110000001111 Not tainted
> r00-03  0004fc0f 10644f10 1011ee68 5f578288
> r04-07  00000014 8c1fe860 8c1fe828 8eb7d030
> r08-11  105ee890 00000040 0001264a 000d3b60
> r12-15  00000000 000d3b5c 000dde68 000b0000
> r16-19  8eb7d250 000b0000 ffffffff 000127ec
> r20-23  ffffe040 00000000 101205d4 00000000
> r24-27  00012800 101205cc 5f578288 1062ff10
> r28-31  00000000 000002ee 5f578640 10120630
> sr00-03  00000000 000013a7 00000000 000013a7
> sr04-07  00000000 00000000 00000000 00000000
> 
> IASQ: 00000000 00000000 IAOQ: 1011ed04 1011ed08
>  IIR: 0e601093    ISR: 00000000  IOR: 000127ec
>  CPU:        0   CR30: 5f578000 CR31: ffffffff
>  ORIG_R28: 40400000
>  IAOQ[0]: unwind_frame_regs+0x214/0x244
>  IAOQ[1]: unwind_frame_regs+0x218/0x244
>  RP(r2): unwind_once+0x10/0x48
> Backtrace:
>  [<1011ee68>] unwind_once+0x10/0x48
>  [<10112bbc>] do_show_stack+0x28/0xac
>  [<10112cd0>] parisc_show_stack+0x90/0xa8
>  [<10111258>] do_page_fault+0x174/0x294
>  [<10113824>] handle_interruption+0x570/0x58c
>  [<10117078>] intr_check_sig+0x0/0x34
> 
> Kernel panic - not syncing: Kernel Fault
>