crash log for WebKitTestRunner (pid 195):

[New LWP 195]
[New LWP 326]
[New LWP 327]
[New LWP 325]
[New LWP 317]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/app/webkit/WebKitBuild/Release/bin/WebKitTestRunner -'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000056134be0aa20 in WTR::PlatformWebView::page() ()
[Current thread is 1 (Thread 0x7f044b6e5380 (LWP 195))]

Thread 5 (Thread 0x7f0444b16640 (LWP 317)):
#0  0x00007f044f198e1d in __futex_abstimed_wait_common64 (futex_word=futex_word@entry=0x7f0452b72d6c <bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+76>, expected=expected@entry=0, clockid=clockid@entry=1, abstime=abstime@entry=0x7f0444b15b40, private=private@entry=0, cancel=cancel@entry=true) at ../sysdeps/nptl/futex-internal.c:74
#1  0x00007f044f198e8f in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f0452b72d6c <bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+76>, expected=expected@entry=0, clockid=clockid@entry=1, abstime=abstime@entry=0x7f0444b15b40, private=private@entry=0) at ../sysdeps/nptl/futex-internal.c:123
#2  0x00007f044f192bdb in __pthread_cond_wait_common (abstime=0x7f0444b15b40, clockid=1, mutex=<optimized out>, cond=0x7f0452b72d40 <bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+32>) at pthread_cond_wait.c:504
#3  __pthread_cond_clockwait (abstime=0x7f0444b15b40, clockid=1, mutex=<optimized out>, cond=0x7f0452b72d40 <bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+32>) at pthread_cond_wait.c:672
#4  __pthread_cond_clockwait (cond=0x7f0452b72d40 <bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+32>, mutex=<optimized out>, clockid=1, abstime=0x7f0444b15b40) at pthread_cond_wait.c:660
#5  0x00007f045280413a in bmalloc::Scavenger::threadRunLoop() () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#6  0x00007f04528042c9 in  () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#7  0x00007f044c9605e5 in std::execute_native_thread_routine(void*) (__p=0x56134d14a3a0) at ../../../../../libstdc++-v3/src/c++11/thread.cc:82
#8  0x00007f044f18c3ba in start_thread (arg=0x7f0444b16640) at pthread_create.c:481
#9  0x00007f044c64ab03 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f0403cff640 (LWP 325)):
#0  0x00007f044f198e1d in __futex_abstimed_wait_common64 (futex_word=futex_word@entry=0x7f04442e2060, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x7f0403cfe810, private=private@entry=0, cancel=cancel@entry=true) at ../sysdeps/nptl/futex-internal.c:74
#1  0x00007f044f198e8f in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f04442e2060, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x7f0403cfe810, private=private@entry=0) at ../sysdeps/nptl/futex-internal.c:123
#2  0x00007f044f1928ec in __pthread_cond_wait_common (abstime=0x7f0403cfe810, clockid=0, mutex=0x7f04442e2010, cond=0x7f04442e2038) at pthread_cond_wait.c:504
#3  __pthread_cond_timedwait (cond=0x7f04442e2038, mutex=0x7f04442e2010, abstime=0x7f0403cfe810) at pthread_cond_wait.c:637
#4  0x00007f04527f55f4 in WTF::ThreadCondition::timedWait(WTF::Mutex&, WTF::WallTime) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#5  0x00007f045277cd53 in WTF::ParkingLot::parkConditionallyImpl(void const*, WTF::ScopedLambda<bool ()> const&, WTF::ScopedLambda<void ()> const&, WTF::TimeWithDynamicClockType const&) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#6  0x00007f0452781046 in WTF::sleep(WTF::Seconds) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#7  0x00007f0453aacc8a in WebKit::MemoryPressureMonitor::start()::{lambda()#1}::operator()() const [clone .constprop.0] () at /app/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.1.so.0
#8  0x00007f0453aad479 in  () at /app/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.1.so.0
#9  0x00007f0452782dda in WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#10 0x00007f04527f4bc9 in WTF::wtfThreadEntryPoint(void*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#11 0x00007f044f18c3ba in start_thread (arg=0x7f0403cff640) at pthread_create.c:481
#12 0x00007f044c64ab03 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f0402cfd640 (LWP 327)):
#0  futex_wake (private=<optimized out>, processes_to_wake=1, futex_word=<optimized out>) at ../sysdeps/nptl/futex-internal.h:209
#1  __pthread_cond_signal (cond=0x7f04442fe3b8) at pthread_cond_signal.c:94
#2  0x00007f045277dec3 in WTF::ParkingLot::unparkOneImpl(void const*, WTF::ScopedLambda<long (WTF::ParkingLot::UnparkResult)> const&) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#3  0x00007f045277034d in WTF::LockAlgorithm<unsigned char, (unsigned char)1, (unsigned char)2, WTF::EmptyLockHooks<unsigned char> >::unlockSlow(WTF::Atomic<unsigned char>&, WTF::LockAlgorithm<unsigned char, (unsigned char)1, (unsigned char)2, WTF::EmptyLockHooks<unsigned char> >::Fairness) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#4  0x00007f04527ed5f8 in WTF::BinarySemaphore::signal() () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#5  0x00007f04527ef65f in WTF::Detail::CallableWrapper<WTF::WorkQueueBase::platformInitialize(char const*, WTF::WorkQueueBase::Type, WTF::Thread::QOS)::{lambda()#1}, void>::call() () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#6  0x00007f0452782dda in WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#7  0x00007f04527f4bc9 in WTF::wtfThreadEntryPoint(void*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#8  0x00007f044f18c3ba in start_thread (arg=0x7f0402cfd640) at pthread_create.c:481
#9  0x00007f044c64ab03 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f04034fe640 (LWP 326)):
#0  0x00007f044c63fb5d in __GI___poll (fds=0x7eeff80043c0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f0457dae5ce in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7eeff80043c0, timeout=<optimized out>, context=0x7eeff8000b60) at ../glib/gmain.c:4478
#2  g_main_context_iterate (context=0x7eeff8000b60, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4170
#3  0x00007f0457dae943 in g_main_loop_run (loop=0x7eeff8003200) at ../glib/gmain.c:4373
#4  0x00007f04527f2160 in WTF::RunLoop::run() () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#5  0x00007f0452782dda in WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#6  0x00007f04527f4bc9 in WTF::wtfThreadEntryPoint(void*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#7  0x00007f044f18c3ba in start_thread (arg=0x7f04034fe640) at pthread_create.c:481
#8  0x00007f044c64ab03 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f044b6e5380 (LWP 195)):
#0  0x000056134be0aa20 in WTR::PlatformWebView::page() ()
#1  0x000056134be0b6a3 in WTR::TestController::platformPreferences() ()
#2  0x000056134bdd9597 in WTR::TestController::resetPreferencesToConsistentValues(WTR::TestOptions const&) ()
#3  0x000056134bdddc39 in WTR::TestController::createWebViewWithOptions(WTR::TestOptions const&) ()
#4  0x000056134bde40e7 in WTR::TestController::ensureViewSupportsOptionsForTest(WTR::TestInvocation const&) ()
#5  0x000056134bde46e1 in WTR::TestController::configureViewForTest(WTR::TestInvocation const&) ()
#6  0x000056134bdf190d in WTR::TestInvocation::invoke() ()
#7  0x000056134bddaefd in WTR::TestController::runTest(char const*) ()
#8  0x000056134bddb5ef in WTR::TestController::runTestingServerLoop() ()
#9  0x000056134bddbbd8 in WTR::TestController::TestController(int, char const**) ()
#10 0x000056134bdca8bb in main ()

STDERR: 
STDERR: warning: core file may not match specified executable file.
STDERR: 
STDERR: warning: the debug information found in "/usr/lib/debug//usr/lib/x86_64-linux-gnu/libicudata.so.69.1.debug" does not match "/usr/lib/x86_64-linux-gnu/libicudata.so.69" (CRC mismatch).
STDERR: 
STDERR: 
STDERR: warning: the debug information found in "/usr/lib/debug//usr/lib/x86_64-linux-gnu/libicudata.so.69.1.debug" does not match "/usr/lib/x86_64-linux-gnu/libicudata.so.69" (CRC mismatch).
STDERR: 
STDERR: 
STDERR: warning: the debug information found in "/usr/lib/debug//usr/lib/x86_64-linux-gnu/libdl-2.33.so.debug" does not match "/usr/lib/x86_64-linux-gnu/libdl.so.2" (CRC mismatch).
STDERR: 
STDERR: 
STDERR: warning: the debug information found in "/usr/lib/debug//usr/lib/x86_64-linux-gnu/libdl-2.33.so.debug" does not match "/usr/lib/x86_64-linux-gnu/libdl.so.2" (CRC mismatch).
STDERR: 
STDERR: 
STDERR: warning: the debug information found in "/usr/lib/debug//usr/lib/x86_64-linux-gnu/libwayland-egl.so.1.0.0.debug" does not match "/usr/lib/x86_64-linux-gnu/libwayland-egl.so.1" (CRC mismatch).
STDERR: 
STDERR: 
STDERR: warning: the debug information found in "/usr/lib/debug//usr/lib/x86_64-linux-gnu/libwayland-egl.so.1.0.0.debug" does not match "/usr/lib/x86_64-linux-gnu/libwayland-egl.so.1" (CRC mismatch).
STDERR: 
STDERR: 
STDERR: warning: the debug information found in "/usr/lib/debug//usr/lib/x86_64-linux-gnu/libX11-xcb.so.1.0.0.debug" does not match "/usr/lib/x86_64-linux-gnu/libX11-xcb.so.1" (CRC mismatch).
STDERR: 
STDERR: 
STDERR: warning: the debug information found in "/usr/lib/debug//usr/lib/x86_64-linux-gnu/libX11-xcb.so.1.0.0.debug" does not match "/usr/lib/x86_64-linux-gnu/libX11-xcb.so.1" (CRC mismatch).
STDERR: 
STDERR: 
STDERR: warning: the debug information found in "/usr/lib/debug//usr/lib/x86_64-linux-gnu/libxcb-dri2.so.0.0.0.debug" does not match "/usr/lib/x86_64-linux-gnu/libxcb-dri2.so.0" (CRC mismatch).
STDERR: 
STDERR: 
STDERR: warning: the debug information found in "/usr/lib/debug//usr/lib/x86_64-linux-gnu/libxcb-dri2.so.0.0.0.debug" does not match "/usr/lib/x86_64-linux-gnu/libxcb-dri2.so.0" (CRC mismatch).
STDERR: 
STDERR: <empty>