[ltt-dev] Linux-2.6.29.5 crashes with LTTng-0.122

[Mathieu Desnoyers]

* srikanth krishnakar (skrishnakar at gmail.com) wrote:
> Hi Mathieu,
> 
> Target  : Xilinx 440
> Arch : PowerPC
> File system: NFS
> 
> Just booted Linux-2.6.29.5  with LTTng-0.122 in the kernel : While mounting
> the file system.. I noticed the kernel crash saying :
> 
> PREEMPT LTT NESTING LEVEL : 0.
> 

LTT NESTING LEVEL : 0 means it's very likely _not_ related to the LTT
code. This nesting counter permits to see if a kernel crash happened
while running LTT tracing code.

You should try without the LTTng patchset anyway, just to be sure,
because the patchset also touches the rest of the kernel tree, but it
looks like a Linux bug.

Mathieu


> 
> Can you please comment on this ?
> 
> Here is the trace log :
> 
> -----------------------------------------------------------
> 
> Freeing unused kernel memory: 172k
> init
> 
> INIT: version 2.86
> booting
> 
> ------------[ cut here
> ]------------
> 
> kernel BUG at
> kernel/workqueue.c:292!
> 
> Oops: Exception in kernel mode, sig: 5
> [#1]
> 
> PREEMPT LTT NESTING LEVEL :
> 0
> 
> Xilinx
> Virtex440
> 
> Modules linked
> in:
> 
> NIP: c0049c88 LR: c004a480 CTR:
> c002b668
> 
> REGS: cfad9eb0 TRAP: 0700   Not tainted
> (2.6.29.5)
> 
> MSR: 00029000 <EE,ME,CE>  CR: 24000028  XER:
> 20000000
> 
> TASK = cfa737f0[801] 'rpciod/0' THREAD:
> cfad8000
> 
> GPR00: 00922628 cfad9f60 cfa737f0 cfa380f8 cfad9f98 00000001 00000000
> 00000000
> GPR08: cfad9fa4 00000001 cfa380fc 00922627 24000082 ffffd6c4 f9fedfff
> fbbf7fbf
> GPR16: fffffffd fff7ffbf e17fffbf 00000001 00000000 cf831fac c033f5a4
> c031d870
> GPR24: c031d838 00000001 00000000 cfad8034 c02b1ed8 cfad8000 cf2ff3a0
> cfa380f8
> NIP [c0049c88]
> run_workqueue+0xc4/0x1b0
> 
> LR [c004a480]
> worker_thread+0x54/0xb8
> 
> Call
> Trace:
> 
> [cfad9f60] [cf831fac] 0xcf831fac
> (unreliable)
> 
> [cfad9f90] [c004a480]
> worker_thread+0x54/0xb8
> 
> [cfad9fd0] [c004e854]
> kthread+0x50/0x88
> 
> [cfad9ff0] [c000e078]
> original_kernel_thread+0x4c/0x68
> 
> Instruction
> dump:
> 
> 813d000c 3929ffff 913d000c 801b0000 70090004 408200b0 7fe3fb78
> 801f0000
> 5400003a 7fc00278 3160ffff 7d2b0110 <0f090000> 7c00f828 7c00c878
> 7c00f92d
> ---[ end trace 7b7c99a64cabd8ad ]---
> 
> 
> Any comments, on this ?
> 
> Thanks in Advance!
> 
> Srikanth Krishnakar
> **********************

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-- 
Mathieu Desnoyers
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