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[Libunwind-devel] SIGSEGV in ARM+Alarm handler

From: Harald Servat
Subject: [Libunwind-devel] SIGSEGV in ARM+Alarm handler
Date: Wed, 23 Sep 2015 11:49:30 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0

Dear all,

we have encountered the following SIGSEGV in a ARM system when unwinding the stack in a alarm handler. We're currently using the latest version of libunwind available from the GIT repository. The system is currently running linux kernel 3.11 with the following processor

model name      : ARMv7 Processor rev 4 (v7l)
Features : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae

  The libunwind library was compiled using a regular

  ./configure --prefix=<DIR> and the CFLAGS within the Makefile is

  -g -O2 -fexceptions -Wall -Wsign-compare

  Our sampling library is compiled with the following flags

  -g -O2 -fno-optimize-sibling-calls -funwind-tables -Wall -W

  and the binary to be sampled is compiled using

-O3 -g -funwind-tables -march=armv7 -mtune=cortex-a15 -mfloat-abi=hard -mfpu=neon

Any thoughts on what might be wrong? What else could I provide to help fixing this issue?

Thank you very much in advance.

Core was generated by `./stream.i'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  _ULarm_step (address@hidden) at arm/Gstep.c:244
244                   if ((instr & 0xFFFFD800) == 0xE92DD800)
(gdb) where
#0  _ULarm_step (address@hidden) at arm/Gstep.c:244
#1  0xb6db99b4 in trace_callers (time=4294967297, offset=5, address@hidden,
    address@hidden) at calltrace.c:79
#2 0xb6dd0024 in Extrae_SamplingHandler (address=0xb6ce8b6c <__memcpy_neon+748>)
    at sampling-timer.c:96
#3 0xb6dd00d0 in TimeSamplingHandler (sig=<optimized out>, siginfo=<optimized out>,
    context=<optimized out>) at sampling-timer.c:206
#4  <signal handler called>
#5  0xb6ce8b6c in __memcpy_neon ()
    at ../ports/sysdeps/arm/armv7/multiarch/memcpy_impl.S:596
#6  0x00008944 in mysecond () at stream.c:422
#7  main () at stream.c:320

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