[lttng-dev] Getting SIGBUS in babeltrace - occasionally

[Mathieu Desnoyers]

* Amit Margalit (AMITM at il.ibm.com) wrote:
> Hi,
> 
> I am getting occasional SIGBUS inside _aligned_integer_read() in 
> ./formats/ctf/types/integer.c
> 
> Here is the backtrace, maybe someone could take a look and suggest 
> something:

It looks like you're hitting the internal checks for overflow on the
buffer boundaries.

On which babeltrace version can you reproduce it ? Did you do any
modification to babeltrace on your own on top ?

Are you getting this with a lttng-ust or lttng-modules trace ? If yes,
which version of the tool has generated the trace ?

Can you provide a sample trace that triggers this issue ?

Can you give us the detailed sequence of steps you use to reproduce ?

Thanks,

Mathieu

> #0  _aligned_integer_read (definition=0x954320, ppos=0x106e028) at 
> integer.c:81
> #1  ctf_integer_read (ppos=0x106e028, definition=0x954320) at 
> integer.c:224
> #2  0x00007ffff070e36e in generic_rw (definition=<optimized out>, 
> pos=0x106e028) at ../include/babeltrace/types.h:133
> #3  bt_struct_rw (ppos=0x106e028, definition=0x9542e0) at struct.c:56
> #4  0x00007ffff13f7fda in generic_rw (definition=<optimized out>, 
> pos=0x106e028) at ../../include/babeltrace/types.h:133
> #5  ctf_packet_seek (stream_pos=0x106e028, index=<optimized out>, 
> whence=<optimized out>) at ctf.c:860
> #6  0x00007ffff070a3f1 in seek_file_stream_by_timestamp 
> (cfs=cfs at entry=0x106cf90, timestamp=timestamp at entry=1374636821498972926) 
> at iterator.c:141
> #7  0x00007ffff070aa96 in seek_ctf_trace_by_timestamp 
> (stream_heap=0x176d310, timestamp=1374636821498972926, tin=<optimized 
> out>) at iterator.c:188
> #8  bt_iter_set_pos (iter=iter at entry=0xfdafa0, iter_pos=0x2bf59f0) at 
> iterator.c:439
> #9  0x00007ffff1624f01 in _wrap__bt_iter_set_pos (self=<optimized out>, 
> args=<optimized out>) at babeltrace_wrap.c:3805
> #10 0x00007ffff7b28c0c in call_function (oparg=<optimized out>, 
> pp_stack=<optimized out>) at Python/ceval.c:3679
> #11 PyEval_EvalFrameEx (f=0x1c243c0, throwflag=<optimized out>) at 
> Python/ceval.c:2370
> #12 0x00007ffff7b2e0d2 in PyEval_EvalCodeEx (co=0xa8e5d0, 
> globals=<optimized out>, locals=<optimized out>, args=0x2088cc8, 
> argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0, closure=0x0)
>     at Python/ceval.c:2942
> .
> .
> .
> 
> Any suggestions are welcome.
> 
> Amit Margalit
> IBM XIV - Storage Reinvented
> XIV-NAS Development Team
> Tel. 03-689-7774
> Fax. 03-689-7230
> _______________________________________________
> lttng-dev mailing list
> lttng-dev at lists.lttng.org
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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com