Hi All, We are running Firebird-2.5.1 on virtual machine with RHEL6.0. Our hypervisor is KVM. From time to time we get Firebird unresponsive and we need to restart it. This situation occurs on heavy loaded system, strace shows that the problem is related with the fragment of code which contains invocation of pthread_cond_timedwait sytem call (file /src/jrd/isc_sync.cpp). It looks like all threads lost completely synchronization and block each other. We use your standard distribution package. There is small chance that this problem can be attributed to different environment used during build, thus we are going to recompile Firebird from scratch. Hovewer more viable explanation is that we encountered bug which becomes visible in virtual environment. We have some experiances with timekeeping in virtual machines which is not very accurate and could possibly lead to this effect. If pthread_cond_timedwait sytem is not working correctly can it be simply replaced by other system call which could be more reliable ?
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