Package: gdb
Version: 6.7.1-2
Severity: normal
I'm having trouble with gdb stopping on SIGTRAP a lot. I can run up to the
first breakpoint, then sometimes I try to print or step and gdb will
claim that the program is responding to SIGTRAP. I'm debugging C++ code and
I'm doing nothing with signals in this code.
As an example, I've hit a break point and printing values in a vector. The
first value prints fine, then gdb starts doing the following below. The
"set unwindonsignal on" doesn't help. I still get SIGTRAPS after this,
almost as if gdb thinks there's a breakpoint on every statement from then on.
(gdb) p context->h[iwi]
$30 = (const int &) @0x8058194: 3
(gdb) p context->h[2]
Program received signal SIGTRAP, Trace/breakpoint trap.
0xb7ce6913 in std::vector<int, std::allocator<int> >::operator[] (
this=0x8057d84, __n=2) at /usr/include/c++/4.2/bits/stl_vector.h:489
489 operator[](size_type __n) const
The program being debugged was signaled while in a function called from GDB.
GDB remains in the frame where the signal was received.
To change this behavior use "set unwindonsignal on"
Evaluation of the expression containing the function (std::vector<int,
std::allocator<int> >::operator[](unsigned int) const) will be abandoned.
(gdb) fin
Run till exit from #0 0xb7ce6913 in std::vector<int, std::allocator<int>
>::operator[] (this=0x8057d84, __n=2) at
/usr/include/c++/4.2/bits/stl_vector.h:489
Program received signal SIGTRAP, Trace/breakpoint trap.
std::vector<int, std::allocator<int> >::operator[] (this=0x8057d84, __n=2)
at /usr/include/c++/4.2/bits/stl_vector.h:490
490 { return *(this->_M_impl._M_start + __n); }
The only way I've been able to work around this and shut gdb up is:
handle SIGTRAP noprint nostop
However, once I've hit a break point, I find the code tends to execute
really slowly. I suspect this is related to the handler change above. But
I can't confirm because gdb misbehaves without changing the handler.
-- System Information:
Debian Release: lenny/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable')
Architecture: i386 (i686)
Kernel: Linux 2.6.24-1-686 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages gdb depends on:
ii libc6 2.7-10 GNU C Library: Shared libraries
ii libexpat1 1.95.8-4 XML parsing C library - runtime li
ii libncurses5 5.6+20080308-1 Shared libraries for terminal hand
ii libreadline5 5.2-3 GNU readline and history libraries
gdb recommends no packages.
-- no debconf information
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