Which thread caused dump?

["Steffen Schumacher" <STEFF at tdc dot dk>]

Hi!

I have a multithreaded program which coredumps after ~20 hours of
running.
Is it possible to see which thread caused the crash?
Usually I use thr x and bt for seeing if some exception was thrown, but
I have a case where no thread is throwing any exceptions.

I've enclosed output from the actual core dump.. any other cmd's I
should know of?
Any help on discovering why it is crashing would be greatly
appreciated..

/Steffen


testnxq2# uname -a
FreeBSD testnxq2.xxx.dk 6.1-RELEASE FreeBSD 6.1-RELEASE #0: Sun May  7
04:32:43 UTC 2006
root@opus.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

testnxq2# gdb measuring measuring.core
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
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There is absolutely no warranty for GDB.  Type "show warranty" for
details.
This GDB was configured as "i386-marcel-freebsd"...
Core was generated by `measuring'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/lib/libpcap.so.4...done.
Loaded symbols for /usr/lib/libpcap.so.4
Reading symbols from /usr/local/lib/libqosmysql.so.1...done.
Loaded symbols for /usr/local/lib/libqosmysql.so.1
Reading symbols from /usr/local/lib/libqosthreads.so.1...done.
Loaded symbols for /usr/local/lib/libqosthreads.so.1
Reading symbols from /usr/local/lib/libqoslog.so.1...done.
Loaded symbols for /usr/local/lib/libqoslog.so.1
Reading symbols from /usr/local/lib/libqoslegacynetstuff.so.1...done.
Loaded symbols for /usr/local/lib/libqoslegacynetstuff.so.1
Reading symbols from /usr/local/lib/libqoscommon.so.1...done.
Loaded symbols for /usr/local/lib/libqoscommon.so.1
Reading symbols from /usr/local/lib/libqosmeasuring.so.1...done.
Loaded symbols for /usr/local/lib/libqosmeasuring.so.1
Reading symbols from /usr/local/lib/libqosdb.so.1...done.
Loaded symbols for /usr/local/lib/libqosdb.so.1
Reading symbols from /usr/local/lib/libqospacket.so.1...done.
Loaded symbols for /usr/local/lib/libqospacket.so.1
Reading symbols from /usr/local/lib/libqosaggregation.so.1...done.
Loaded symbols for /usr/local/lib/libqosaggregation.so.1
Reading symbols from /usr/lib/libstdc++.so.5...done.
Loaded symbols for /usr/lib/libstdc++.so.5
Reading symbols from /lib/libm.so.4...done.
Loaded symbols for /lib/libm.so.4
Reading symbols from /usr/lib/libpthread.so.2...done.
Loaded symbols for /usr/lib/libpthread.so.2
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /usr/local/lib/libmysqlpp.so.2...done.
Loaded symbols for /usr/local/lib/libmysqlpp.so.2
Reading symbols from /usr/local/lib/libqoscmd.so.1...done.
Loaded symbols for /usr/local/lib/libqoscmd.so.1
Reading symbols from /lib/libz.so.3...done.
Loaded symbols for /lib/libz.so.3
Reading symbols from /usr/local/lib/mysql/libmysqlclient.so.15...done.
Loaded symbols for /usr/local/lib/mysql/libmysqlclient.so.15
Reading symbols from /lib/libcrypt.so.3...done.
Loaded symbols for /lib/libcrypt.so.3
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0  0x2834f4ab in pthread_testcancel () from /usr/lib/libpthread.so.2
[New Thread 0x806bc00 (sleeping)]
[New Thread 0x806ba00 (runnable)]
[New Thread 0x806b800 (sleeping)]
[New Thread 0x806b600 (runnable)]
[New Thread 0x8057800 (runnable)]
[New Thread 0x8057600 (runnable)]
[New Thread 0x8057400 (runnable)]
[New Thread 0x8057200 (LWP 100041)]
[New Thread 0x8057000 (sleeping)]
[New LWP 100080]
(gdb) info threads
* 10 LWP 100080  0x2834f4ab in pthread_testcancel () from
/usr/lib/libpthread.so.2
  9 Thread 0x8057000 (sleeping)  0x28347f0f in pthread_mutexattr_init ()
from /usr/lib/libpthread.so.2
  8 Thread 0x8057200 (LWP 100041)  0x2834f46b in pthread_testcancel ()
from /usr/lib/libpthread.so.2
  7 Thread 0x8057400 (runnable)  0x28347f0f in pthread_mutexattr_init ()
from /usr/lib/libpthread.so.2
  6 Thread 0x8057600 (runnable)  0x28347f0f in pthread_mutexattr_init ()
from /usr/lib/libpthread.so.2
  5 Thread 0x8057800 (runnable)  0x282960de in std::_Rb_tree_increment
() from /usr/lib/libstdc++.so.5
  4 Thread 0x806b600 (runnable)  0x2840c7df in read () from
/lib/libc.so.6
  3 Thread 0x806b800 (sleeping)  0x28347f0f in pthread_mutexattr_init ()
from /usr/lib/libpthread.so.2
  2 Thread 0x806ba00 (runnable)  0x283ffacb in gettimeofday () from
/lib/libc.so.6
  1 Thread 0x806bc00 (sleeping)  0x28347f0f in pthread_mutexattr_init ()
from /usr/lib/libpthread.so.2
(gdb) thr 1
[Switching to thread 1 (Thread 0x806bc00 (sleeping))]#0  0x28347f0f in
pthread_mutexattr_init () from /usr/lib/libpthread.so.2
(gdb) bt
#0  0x28347f0f in pthread_mutexattr_init () from
/usr/lib/libpthread.so.2
#1  0x283419ae in _nanosleep () from /usr/lib/libpthread.so.2
#2  0x283d7669 in sleep () from /lib/libc.so.6
#3  0x283373aa in sleep () from /usr/lib/libpthread.so.2
#4  0x280c4b26 in WatchDog::execute (this=0x805a2c0) at WatchDog.cpp:138
#5  0x2813d015 in IThread<WatchDog>::entrypoint (pthis=0x805a2c0) at
IThread.h:175
#6  0x28340319 in pthread_create () from /usr/lib/libpthread.so.2
#7  0x283f4637 in _ctx_start () from /lib/libc.so.6
(gdb) thr 2
[Switching to thread 2 (Thread 0x806ba00 (runnable))]#0  0x283ffacb in
gettimeofday () from /lib/libc.so.6
(gdb) bt
#0  0x283ffacb in gettimeofday () from /lib/libc.so.6
#1  0x283f31de in time () from /lib/libc.so.6
#2  0x280d4161 in LogSender::lsWrite (this=0x8051d00, message=
        {static npos = 4294967295, _M_dataplus = {<std::allocator<char>>
= {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data
fields>}, _M_p = 0x8071a2c "sending 3 results"}}, level=7 '\a') at
LogSender.cpp:25
#3  0x280d40a5 in LogSender::lsWrite (this=0x8051d00, message=
        {static npos = 4294967295, _M_dataplus = {<std::allocator<char>>
= {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data
fields>}, _M_p = 0x7 <Address 0x7 out of bounds>}}) at LogSender.cpp:17
#4  0x280d43aa in LogSender::bufferChar (this=0x8051d00, c=10 '\n') at
LogSender.cpp:63
#5  0x280d4e74 in LogSender::LogStreambuf::overflow (this=0x8051d18,
c=10) at LogSender.h:119
#6  0x282c13ff in std::basic_streambuf<char, std::char_traits<char>
>::xsputn () from /usr/lib/libstdc++.so.5
#7  0x282b78eb in std::operator<< <std::char_traits<char> > () from
/usr/lib/libstdc++.so.5
#8  0x2820a415 in ResultHandler::execute (this=0x806c400) at
ResultHandler.cpp:85
#9  0x2813cf65 in IMonitoredThread<ResultHandler>::entrypoint
(pthis=0x806c400) at IMonitoredThread.h:217
#10 0x28340319 in pthread_create () from /usr/lib/libpthread.so.2
#11 0x283f4637 in _ctx_start () from /lib/libc.so.6
(gdb) thr 3
[Switching to thread 3 (Thread 0x806b800 (sleeping))]#0  0x28347f0f in
pthread_mutexattr_init () from /usr/lib/libpthread.so.2
(gdb) bt
#0  0x28347f0f in pthread_mutexattr_init () from
/usr/lib/libpthread.so.2
#1  0x283419ae in _nanosleep () from /usr/lib/libpthread.so.2
#2  0x283f31b7 in usleep () from /lib/libc.so.6
#3  0x283373f6 in usleep () from /usr/lib/libpthread.so.2
#4  0x2812fb04 in PacketScheduler::execute (this=0x806c100) at
PacketScheduler.cpp:104
#5  0x2813ce81 in IMonitoredThread<PacketScheduler>::entrypoint
(pthis=0x806c100) at IMonitoredThread.h:217
#6  0x28340319 in pthread_create () from /usr/lib/libpthread.so.2
#7  0x283f4637 in _ctx_start () from /lib/libc.so.6
(gdb) thr 4
[Switching to thread 4 (Thread 0x806b600 (runnable))]#0  0x2840c7df in
read () from /lib/libc.so.6
(gdb) bt
#0  0x2840c7df in read () from /lib/libc.so.6
#1  0x2833819a in read () from /usr/lib/libpthread.so.2
#2  0x2808a5ac in pcap_lookupnet () from /usr/lib/libpcap.so.4
#3  0x2808b57e in pcap_dispatch () from /usr/lib/libpcap.so.4
#4  0x2808b666 in pcap_next () from /usr/lib/libpcap.so.4
#5  0x2814cc60 in Receiver::getPacket (this=0x8088000, pac=0xbf5faf2c,
t=@0xbf5faf10) at Receiver.cpp:94
#6  0x2814cdd2 in Receiver::serviceQueue (this=0x8088000) at
Receiver.cpp:144
#7  0x2814cb2c in Receiver::execute (this=0x8088000) at Receiver.cpp:72
#8  0x2813cd9d in IMonitoredThread<Receiver>::entrypoint
(pthis=0x8088000) at IMonitoredThread.h:217
#9  0x28340319 in pthread_create () from /usr/lib/libpthread.so.2
#10 0x283f4637 in _ctx_start () from /lib/libc.so.6
(gdb) thr 5
[Switching to thread 5 (Thread 0x8057800 (runnable))]#0  0x282960de in
std::_Rb_tree_increment () from /usr/lib/libstdc++.so.5
(gdb) bt
#0  0x282960de in std::_Rb_tree_increment () from
/usr/lib/libstdc++.so.5
#1  0x2813c0e6 in std::_Rb_tree_iterator<std::pair<unsigned int const,
std::list<FinishedPacket, SAllocator<FinishedPacket> > > >::operator++ (
    this=0xbf6fbf30) at stl_tree.h:189
#2  0x28135ba8 in Measuring::execute (this=0x805d480) at
Measuring.cpp:114
#3  0x0804c13a in IMonitoredThread<Measuring>::entrypoint
(pthis=0x805d480) at IMonitoredThread.h:217
#4  0x28340319 in pthread_create () from /usr/lib/libpthread.so.2
#5  0x283f4637 in _ctx_start () from /lib/libc.so.6
(gdb) thr 6
[Switching to thread 6 (Thread 0x8057600 (runnable))]#0  0x28347f0f in
pthread_mutexattr_init () from /usr/lib/libpthread.so.2
(gdb) bt
#0  0x28347f0f in pthread_mutexattr_init () from
/usr/lib/libpthread.so.2
#1  0x283419ae in _nanosleep () from /usr/lib/libpthread.so.2
#2  0x283d7669 in sleep () from /lib/libc.so.6
#3  0x283373aa in sleep () from /usr/lib/libpthread.so.2
#4  0x280d5fa2 in LogPostOffice::execute (this=0x805a040) at
LogPostOffice.cpp:75
#5  0x280d9bb9 in IMonitoredThread<LogPostOffice>::entrypoint
(pthis=0x805a040) at IMonitoredThread.h:217
#6  0x28340319 in pthread_create () from /usr/lib/libpthread.so.2
#7  0x283f4637 in _ctx_start () from /lib/libc.so.6
(gdb) tht 7
Undefined command: "tht".  Try "help".
(gdb) thr 7
[Switching to thread 7 (Thread 0x8057400 (runnable))]#0  0x28347f0f in
pthread_mutexattr_init () from /usr/lib/libpthread.so.2
(gdb) bt
#0  0x28347f0f in pthread_mutexattr_init () from
/usr/lib/libpthread.so.2
#1  0x283419ae in _nanosleep () from /usr/lib/libpthread.so.2
#2  0x28337fce in select () from /usr/lib/libpthread.so.2
#3  0x00000000 in ?? ()
(gdb) thr 8
[Switching to thread 8 (Thread 0x8057200 (LWP 100041))]#0  0x2834f46b in
pthread_testcancel () from /usr/lib/libpthread.so.2
(gdb) bt
#0  0x2834f46b in pthread_testcancel () from /usr/lib/libpthread.so.2
#1  0x28347e3c in pthread_mutexattr_init () from
/usr/lib/libpthread.so.2
#2  0x284fa450 in ?? ()
(gdb) thr 9
[Switching to thread 9 (Thread 0x8057000 (sleeping))]#0  0x28347f0f in
pthread_mutexattr_init () from /usr/lib/libpthread.so.2
(gdb) bt
#0  0x28347f0f in pthread_mutexattr_init () from
/usr/lib/libpthread.so.2
#1  0x283419ae in _nanosleep () from /usr/lib/libpthread.so.2
#2  0x283d7669 in sleep () from /lib/libc.so.6
#3  0x283373aa in sleep () from /usr/lib/libpthread.so.2
#4  0x0804a7ae in debug () at main.cpp:92
#5  0x0804a365 in main () at main.cpp:54
(gdb) thr 10
[Switching to thread 10 (LWP 100080)]#0  0x2834f46b in
pthread_testcancel () from /usr/lib/libpthread.so.2
(gdb) bt
#0  0x2834f46b in pthread_testcancel () from /usr/lib/libpthread.so.2
#1  0x28347e3c in pthread_mutexattr_init () from
/usr/lib/libpthread.so.2
#2  0x284fa450 in ?? ()
(gdb)