crash log for WebKitTestRunner (pid 210):

[New LWP 210]
[New LWP 321]
[New LWP 313]
[New LWP 319]
[New LWP 320]
[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  0x00005644eba3ca20 in WTR::PlatformWebView::page() ()
[Current thread is 1 (Thread 0x7f752e780380 (LWP 210))]

Thread 5 (Thread 0x7f74e65fe640 (LWP 320)):
#0  0x00007f752f6dab5d in __GI___poll (fds=0x7f74e00043c0, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007f753ae495ce in g_main_context_poll (priority=<optimized out>, n_fds=1, fds=0x7f74e00043c0, timeout=<optimized out>, context=0x7f74e0000b60) at ../glib/gmain.c:4478
#2  g_main_context_iterate (context=0x7f74e0000b60, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4170
#3  0x00007f753ae49943 in g_main_loop_run (loop=0x7f74e0003200) at ../glib/gmain.c:4373
#4  0x00007f753588d160 in WTF::RunLoop::run() () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#5  0x00007f753581ddda in WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#6  0x00007f753588fbc9 in WTF::wtfThreadEntryPoint(void*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#7  0x00007f75322273ba in start_thread (arg=0x7f74e65fe640) at pthread_create.c:481
#8  0x00007f752f6e5b03 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7f74e6dff640 (LWP 319)):
#0  0x00007f7532233e1d in __futex_abstimed_wait_common64 (futex_word=futex_word@entry=0x7f75272e1060, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x7f74e6dfe810, private=private@entry=0, cancel=cancel@entry=true) at ../sysdeps/nptl/futex-internal.c:74
#1  0x00007f7532233e8f in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f75272e1060, expected=expected@entry=0, clockid=clockid@entry=0, abstime=abstime@entry=0x7f74e6dfe810, private=private@entry=0) at ../sysdeps/nptl/futex-internal.c:123
#2  0x00007f753222d8ec in __pthread_cond_wait_common (abstime=0x7f74e6dfe810, clockid=0, mutex=0x7f75272e1010, cond=0x7f75272e1038) at pthread_cond_wait.c:504
#3  __pthread_cond_timedwait (cond=0x7f75272e1038, mutex=0x7f75272e1010, abstime=0x7f74e6dfe810) at pthread_cond_wait.c:637
#4  0x00007f75358905f4 in WTF::ThreadCondition::timedWait(WTF::Mutex&, WTF::WallTime) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#5  0x00007f7535817d53 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  0x00007f753581c046 in WTF::sleep(WTF::Seconds) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#7  0x00007f7536b47c8a in WebKit::MemoryPressureMonitor::start()::{lambda()#1}::operator()() const [clone .constprop.0] () at /app/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.1.so.0
#8  0x00007f7536b48479 in  () at /app/webkit/WebKitBuild/Release/lib/libwebkit2gtk-4.1.so.0
#9  0x00007f753581ddda in WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#10 0x00007f753588fbc9 in WTF::wtfThreadEntryPoint(void*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#11 0x00007f75322273ba in start_thread (arg=0x7f74e6dff640) at pthread_create.c:481
#12 0x00007f752f6e5b03 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7f7527bb1640 (LWP 313)):
#0  0x00007f7532233e1d in __futex_abstimed_wait_common64 (futex_word=futex_word@entry=0x7f7535c0dd68 <bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+72>, expected=expected@entry=0, clockid=clockid@entry=1, abstime=abstime@entry=0x7f7527bb0b40, private=private@entry=0, cancel=cancel@entry=true) at ../sysdeps/nptl/futex-internal.c:74
#1  0x00007f7532233e8f in __GI___futex_abstimed_wait_cancelable64 (futex_word=futex_word@entry=0x7f7535c0dd68 <bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+72>, expected=expected@entry=0, clockid=clockid@entry=1, abstime=abstime@entry=0x7f7527bb0b40, private=private@entry=0) at ../sysdeps/nptl/futex-internal.c:123
#2  0x00007f753222dbdb in __pthread_cond_wait_common (abstime=0x7f7527bb0b40, clockid=1, mutex=<optimized out>, cond=0x7f7535c0dd40 <bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+32>) at pthread_cond_wait.c:504
#3  __pthread_cond_clockwait (abstime=0x7f7527bb0b40, clockid=1, mutex=<optimized out>, cond=0x7f7535c0dd40 <bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+32>) at pthread_cond_wait.c:672
#4  __pthread_cond_clockwait (cond=0x7f7535c0dd40 <bmalloc::StaticPerProcessStorageTraits<bmalloc::Scavenger>::Storage::s_memory+32>, mutex=<optimized out>, clockid=1, abstime=0x7f7527bb0b40) at pthread_cond_wait.c:660
#5  0x00007f753589f13a in bmalloc::Scavenger::threadRunLoop() () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#6  0x00007f753589f2c9 in  () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#7  0x00007f752f9fb5e5 in std::execute_native_thread_routine(void*) (__p=0x5644ed9b13a0) at ../../../../../libstdc++-v3/src/c++11/thread.cc:82
#8  0x00007f75322273ba in start_thread (arg=0x7f7527bb1640) at pthread_create.c:481
#9  0x00007f752f6e5b03 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7f74e5dfd640 (LWP 321)):
#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=0x7f75272fe3b8) at pthread_cond_signal.c:94
#2  0x00007f7535818ec3 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  0x00007f753580b34d 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  0x00007f75358885f8 in WTF::BinarySemaphore::signal() () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#5  0x00007f753588a65f 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  0x00007f753581ddda in WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#7  0x00007f753588fbc9 in WTF::wtfThreadEntryPoint(void*) () at /app/webkit/WebKitBuild/Release/lib/libjavascriptcoregtk-4.1.so.0
#8  0x00007f75322273ba in start_thread (arg=0x7f74e5dfd640) at pthread_create.c:481
#9  0x00007f752f6e5b03 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7f752e780380 (LWP 210)):
#0  0x00005644eba3ca20 in WTR::PlatformWebView::page() ()
#1  0x00005644eba3d6a3 in WTR::TestController::platformPreferences() ()
#2  0x00005644eba0b597 in WTR::TestController::resetPreferencesToConsistentValues(WTR::TestOptions const&) ()
#3  0x00005644eba0fc39 in WTR::TestController::createWebViewWithOptions(WTR::TestOptions const&) ()
#4  0x00005644eba160e7 in WTR::TestController::ensureViewSupportsOptionsForTest(WTR::TestInvocation const&) ()
#5  0x00005644eba166e1 in WTR::TestController::configureViewForTest(WTR::TestInvocation const&) ()
#6  0x00005644eba2390d in WTR::TestInvocation::invoke() ()
#7  0x00005644eba0cefd in WTR::TestController::runTest(char const*) ()
#8  0x00005644eba0d5ef in WTR::TestController::runTestingServerLoop() ()
#9  0x00005644eba0dbd8 in WTR::TestController::TestController(int, char const**) ()
#10 0x00005644eb9fc8bb 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>