Hi Kyle,
I verified, that my attached patch fixes the kernel panic.
Testcase is here: http://gsyprf10.external.hp.com/~deller/crash.tgz
Could you please apply the patch?
Signed-off-by: Helge Deller <deller@xxxxxx>
Thanks,
Helge
PS:
arch/parisc/kernel/unwind.c, line 225 looks kinda fishy as well:
225: info->prev_ip = *(unsigned long *)(info->prev_sp - RP_OFFSET);
PPS:
Instead of a kernel panic (which is really annoying since you need to
reboot the machine) I now get as expected an user fault:
do_page_fault() pid=1846 command='a.out' type=6 address=0x87802043
vm_start = 0x407ff000, vm_end = 0x40802000
YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
PSW: 00000000000001001111111100001111 Not tainted
r00-03 0004ff0f 407c9f6b 406fbfe3 00012b00
r04-07 fb4ec308 000125b8 407fd534 000e6ba8
r08-11 fb4ec014 00000001 0001264a 000d3b60
r12-15 00000000 000d3b5c 000db4c8 000b0000
r16-19 000d06a0 000b0000 ffffffff 23882000
r20-23 406fc15f 406fc138 87802042 00012d80
r24-27 407fd534 000125b8 407fd534 000125b8
r28-31 00000000 00000000 00012e00 406fbfe3
sr00-03 000007f6 000007f6 00000000 000007f6
sr04-07 000007f6 000007f6 000007f6 000007f6
IASQ: 000007f6 000007f6 IAOQ: 87802043 87802047
IIR: 43ffff80 ISR: 000007f6 IOR: 407d9adc
CPU: 0 CR30: 8dbd0000 CR31: d2b345e2
ORIG_R28: 000107c7
IAOQ[0]: 0x87802040
IAOQ[1]: 0x87802044
RP(r2): 0x406fbfe0
Backtrace:
[<10120650>] outb+0x64/0x70
Helge Deller wrote:
I narrowed down to the problematic codepath, and I assume the attached
patch might fix it. Problem is, that I can't test without my testcase
which is on gsyprf10 (which is unreachable right now), so this patch
here is currently a RFC...
Helge
Signed-off-by: Helge Deller <deller@xxxxxx>
Helge Deller wrote:
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
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