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I have a piece of code looking like this : TAxis *axis = 0; if (dynamic_cast<MonitorObjectH1C*>(obj)) axis = (dynamic_cast<MonitorObjectH1C*>(obj))->GetXaxis(); Sometimes it crashes : Thread 1 (Thread -1208658240 (LWP 11400)): #0 0x0019e7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2 #1 0x048c67fb in __waitpid_nocancel () from /lib/tls/libc.so.6 #2 0x04870649 in do_system () from /lib/tls/libc.so.6 #3 0x048709c1 in system () from /lib/tls/libc.so.6 #4 0x001848bd in system () from /lib/tls/libpthread.so.0 #5 0x0117a5bb in TUnixSystem::Exec () from /opt/root/lib/libCore.so.5.21 #6 0x01180045 in TUnixSystem::StackTrace () from /opt/root/lib/libCore.so.5.21 #7 0x0117cc8a in TUnixSystem::DispatchSignals () from /opt/root/lib/libCore.so.5.21 #8 0x0117cd18 in SigHandler () from /opt/root/lib/libCore.so.5.21 #9 0x0117bf5d in sighandler () from /opt/root/lib/libCore.so.5.21 #10 <signal handler called> #11 0x0533ddf4 in __dynamic_cast () from /usr/lib/libstdc++.so.6 I have no clue why it crashes. obj is not null (and if it was it would not be a problem, would it ?). What could be the reason for a dynamic cast to crash ? If it can't cast, it should just return NULL no ?

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