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Re: print_ubacktrace() and ppc 32


On 08/06/2013 09:07 PM, Lukas Berk wrote:
>>
>> So there is still something missing for ppc32.
> 
> Ah too bad it wasn't a simple plug and play :) Would you mind trying
> again but running your script with the added stap option 
> '-DDEBUG_UNWIND=99' and supplying the output? (ie, stap -DDEBUG_UNWIND=99
> --ldd -ve 'probe... )
> 

probe compiled with:
stap -DDEBUG_UNWIND=99 -g -a powerpc -B CROSS_COMPILE=powerpc-linux- script.stp

On the target the trace output of staprun is:

_stp_stack_unwind_one_user:460: STARTING user unwind
 0x10000448 : foo+0x1c/0x7c [/usr/local/bin/main]
_stp_stack_unwind_one_user:476: CONTINUING user unwind to depth 1
unwind:1452: pc=10000448, 10000448
unwind:1492: trying debug_frame
unwind_frame:1168: Module /usr/local/bin/main: no unwind frame data
unwind:1496: debug_frame failed: -5, trying eh_frame
unwind_frame:1168: Module /usr/local/bin/main: no unwind frame data
unwind:1504: unwinding failed: -5
_stp_stack_unwind_one_user:500: ret=-5 PC=10000448 SP=bfffd640

And the probed binary is crashing:

stap_ac60c2e404cade1c833497ae4f16b820_1577: systemtap: 2.3/0.152, base:
cc581000, memory: 34data/68text/3ctx/2058net/8alloc kb, probes: 1
Unable to handle kernel paging request for data at address 0xbffffb10
Faulting instruction address: 0xc04965d4
Oops: Kernel access of bad area, sig: 11 [#2]
PREEMPT km82xx
Modules linked in: stap_ac60c2e404cade1c833497ae4f16b820_1577(O) [last unloaded:
stap_ac60c2e404cade1c833497ae4f16b820_1577]
CPU: 0 PID: 407 Comm: main Tainted: G      D    O 3.10.0-04826-gc82c8d0-dirty #7
task: c7bab160 ti: c7b8c000 task.ti: c7b8c000
NIP: c04965d4 LR: c0000028 CTR: c03c742c
REGS: c7b8de10 TRAP: 0300   Tainted: G      D    O  (3.10.0-04826-gc82c8d0-dirty)
MSR: 00009032 <EE,ME,IR,DR,RI>  CR: 44000284  XER: 20000000
DAR: bffffb10, DSISR: 20000000

GPR00: c00bd950 c7b8dec0 c7bab160 c69d2104 c7b8df50 00000002 cc902209 38205350
GPR08: c0000000 c050b668 00000000 3b9aca00 28000288 10018794 00000000 00000000
GPR16: 00000000 00000000 00000000 00000000 100ab3f5 10081f20 c0440928 00000000
GPR24: c69d20d0 c69d2104 c69d20c0 00000000 c7b8c000 c7b8df50 c0000028 00000002
NIP [c04965d4] prom_init+0x28/0xfc0
LR [c0000028] __start+0x1c/0x30
Call Trace:
[c7b8dec0] [c00bd950] uprobe_notify_resume+0x4dc/0x920 (unreliable)
[c7b8df30] [c00099b0] do_notify_resume+0x78/0x94
[c7b8df40] [c0010848] do_user_signal+0x74/0xc4
--- Exception: 700 at 0x10000448
    LR = 0x100004ec
Instruction dump:
9361004c 7cbb2b78 93a10054 7c9d2378 93c10058 7fc802a6 93e1005c 7cbf2b78
90010064 91c10018 93810050 91810014 <821efae8> 823eff98 88040000 829efaec
---[ end trace e21ded4f2ec79037 ]---

Segmentation fault

Version numbers:
Kernel: v3.10
gcc: powerpc-gcc (GCC) 4.6.4 20120303 (prerelease)
systemtap: 2.3-32645

Best regards
Holger


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