Hi, I've been chasing this for some time, and finally I've come (with help from others) to a environment which makes the segfault relatively easy to reproduce, although it still requires patience.
Everything happens on a POSIX (Debian testing or unstable) system. On a fast (3GHz) single-threaded single-core virtual machine (qemu-kvm). This is the important part, slow CPU or multi-core environments makes the segfault go away. This is a freshly built firebird 3.0.1.32609 using CFLAGS=-g -O2 -fstack-protector-strong -Wformat -Werror=format-security CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2 CXXFLAGS=-g -O2 -fstack-protector-strong -Wformat -Werror=format-security LDFLAGS=-Wl,-z,relro -Wl,-z,now Below is a backtrace from the following command: echo "show tables;" | $ISQL $FB_IMG/examples/empbuild/employee.fdb I had t run it in a loop for about 2 minutes time before the problem showed itself. FB_IMG=gen/Release/firebird ISQL="$FB_IMG/bin/isql -user SYSDBA" and the following variables are exported in the environment: FIREBIRD=gen/Release/firebird LD_LIBRARY_PATH=gen/Release/firebird/lib FIREBIRD_MSG=gen/Release/firebird A core file may be downloaded from https://people.debian.org/~dmn/fb-core.xz (124KB) I browsed the commits in the B3_0_Release branch, but none seemed to touch any code that seems relevant to me. Any help is appreciated. This got reported twice in the Debian bug-tracker, once for the firebird3.0 package (https://bugs.debian.org/846392) and in libdbd-firebird-perl (firebird driver for Perl - https://bugs.debian.org/847288) Thank you, Damyan Thread 3 (Thread 0x7f0bca6f3500 (LWP 15517)): #0 0x00007f0bc8923b77 in sched_yield () at ../sysdeps/unix/syscall-template.S:84 #1 0x00007f0bca23453a in Thread::yield () at ./src/common/ThreadStart.cpp:244 #2 0x00007f0bca19e115 in Why::Dispatcher::shutdown (this=this@entry=0x7f0bca6e3ee0, userStatus=userStatus@entry=0x7ffc95def0e0, timeout=timeout@entry=5000, reason=reason@entry=-7) at ./src/yvalve/why.cpp:5923 #3 0x00007f0bca19ed05 in fb_shutdown (timeout=timeout@entry=5000, reason=reason@entry=-7) at ./src/yvalve/why.cpp:3725 #4 0x00007f0bca1ca268 in Firebird::PluginManager::unregisterModule (this=<optimized out>, cleanup=0x7f0bc5d58578) at ./src/yvalve/PluginManager.cpp:1060 #5 0x00007f0bca1d1749 in Firebird::IPluginManagerBaseImpl<Firebird::PluginManager, Firebird::CheckStatusWrapper, Firebird::IVersionedImpl<Firebird::PluginManager, Firebird::CheckStatusWrapper, Firebird::Inherit<Firebird::IPluginManager> > >::cloopunregisterModuleDispatcher ( self=<optimized out>, cleanup=<optimized out>) at ./src/include/firebird/IdlFbInterfaces.h:6450 #6 0x00007f0bc5dbaacb in Firebird::IPluginManager::unregisterModule (cleanup=0x7f0bc5d58578, this=<optimized out>) at ./src/include/firebird/IdlFbInterfaces.h:804 #7 Firebird::UnloadDetectorHelper::~UnloadDetectorHelper (this=0x7f0bc5d58570, __in_chrg=<optimized out>) at ./src/include/../common/classes/ImplementHelper.h:295 #8 Firebird::UnloadDetectorHelper::~UnloadDetectorHelper (this=0x7f0bc5d58570, __in_chrg=<optimized out>) at ./src/include/../common/classes/ImplementHelper.h:298 #9 Firebird::GlobalPtr<Firebird::UnloadDetectorHelper, (Firebird::InstanceControl::DtorPriority)1>::dtor ( this=0x7f0bc5feaf18 <(anonymous namespace)::myModule>) at ./src/include/../common/classes/init.h:124 #10 Firebird::InstanceControl::InstanceLink<Firebird::GlobalPtr<Firebird::UnloadDetectorHelper, (Firebird::InstanceControl::DtorPriority)1>, (Firebird::InstanceControl::DtorPriority)1>::dtor (this=0x7f0bc5d585a8) at ./src/include/../common/classes/init.h:98 #11 0x00007f0bc5dba4bc in Firebird::InstanceControl::InstanceList::destructors () at ./src/common/classes/init.cpp:231 #12 0x00007f0bc5dba566 in Firebird::InstanceControl::destructors () at ./src/common/classes/init.cpp:212 #13 0x00007f0bc5dba6cc in (anonymous namespace)::allClean () at ./src/common/classes/init.cpp:87 #14 (anonymous namespace)::Cleanup::~Cleanup (this=<optimized out>, __in_chrg=<optimized out>) at ./src/common/classes/init.cpp:118 #15 0x00007f0bc8887920 in __run_exit_handlers (status=0, listp=0x7f0bc8bea5d8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true, run_dtors=run_dtors@entry=true) at exit.c:83 #16 0x00007f0bc888797a in __GI_exit (status=<optimized out>) at exit.c:105 #17 0x00007f0bc88722b8 in __libc_start_main (main=0x55ecc06124f0 <main(int, char**)>, argc=4, argv=0x7ffc95def488, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc95def478) at ../csu/libc-start.c:325 #18 0x000055ecc061289a in _start () Thread 2 (Thread 0x7f0bc8433700 (LWP 15518)): #0 0x00007f0bc8bff577 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x7f0bca6e12d0) at ../sysdeps/unix/sysv/linux/futex-internal.h:205 #1 do_futex_wait (sem=sem@entry=0x7f0bca6e12d0, abstime=0x0) at sem_waitcommon.c:111 #2 0x00007f0bc8bff624 in __new_sem_wait_slow (sem=0x7f0bca6e12d0, abstime=0x0) at sem_waitcommon.c:181 #3 0x00007f0bc8bff6b9 in __new_sem_wait (sem=sem@entry=0x7f0bca6e12d0) at sem_wait.c:29 #4 0x00007f0bca259132 in Firebird::SignalSafeSemaphore::enter (this=0x7f0bca6e12d0) at ./src/common/classes/semaphore.cpp:163 #5 0x00007f0bca19f01d in (anonymous namespace)::shutdownThread () at ./src/yvalve/why.cpp:810 #6 0x00007f0bca23459e in (anonymous namespace)::ThreadArgs::run (this=<synthetic pointer>) at ./src/common/ThreadStart.cpp:78 #7 (anonymous namespace)::threadStart (arg=0x7f0bca6e1308) at ./src/common/ThreadStart.cpp:93 #8 0x00007f0bc8bf7464 in start_thread (arg=0x7f0bc8433700) at pthread_create.c:333 #9 0x00007f0bc893a9df in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:105 Thread 1 (Thread 0x7f0bc2377700 (LWP 15521)): #0 0x00007f0bc6cec864 in ?? 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