When browsing <https://webkit.org/perf/sunspider-1.0.2/sunspider-1.0.2/driver.html>:

 % gdb -core WebKitWebProcess.core /usr/pkg/libexec/webkit2gtk-4.0/WebKitWebProcess
 Reading symbols from /usr/pkg/libexec/webkit2gtk-4.0/WebKitWebProcess...
 (No debugging symbols found in /usr/pkg/libexec/webkit2gtk-4.0/WebKitWebProcess)
 [New process 1]
 [New process 18]
 [New process 17]
 [New process 16]
 [New process 15]
 [New process 14]
 [New process 13]
 [New process 12]
 [New process 11]
 [New process 10]
 [New process 9]
 [New process 8]
 [New process 7]
 [New process 6]
 [New process 5]
 [New process 4]
 [New process 3]
 [New process 2]
 Core was generated by `WebKitWebProcess'.
 Program terminated with signal SIGSEGV, Segmentation fault.
 #0  0x0000f79954b77c90 in JSC::JSCell::toPrimitive(JSC::ExecState*, JSC::PreferredPrimitiveType) const ()
    from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
 [Current thread is 1 (process 1)]
 (gdb) bt
 #0  0x0000f79954b77c90 in JSC::JSCell::toPrimitive(JSC::ExecState*, JSC::PreferredPrimitiveType) const ()
    from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
 #1  0x0000f79954a6c3fc in operationCompareLess () from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
 #2  0x0000f79946a3127c in ?? ()
 #3  0x0000f7994032dbf0 in ?? ()
 Backtrace stopped: previous frame inner to this frame (corrupt stack?)
 (gdb) f 0
 #0  0x0000f79954b77c90 in JSC::JSCell::toPrimitive(JSC::ExecState*, JSC::PreferredPrimitiveType) const ()
    from /usr/pkg/lib/libjavascriptcoregtk-4.0.so.18
 (gdb) info reg
 x0             0x10                16
 x1             0xfffffff31350      281474975863632
 x2             0x1                 1
 x3             0x0                 0
 x4             0xffff000000000003  -281474976710653
 x5             0xffff000000000000  -281474976710656
 x6             0x3f                63
 x7             0x538bd             342205
 x8             0xf79945200000      272237661782016
 x9             0x1                 1
 x10            0xe                 14
 x11            0x1                 1
 x12            0xbf                191
 x13            0x30                48
 x14            0xf799410f3618      272237593572888
 x15            0x1c                28
 x16            0xf79955414e18      272237932400152
 x17            0xf79954b77c90      272237923368080
 x18            0x6972747320657375  7598263559141028725
 x19            0xf79945208000      272237661814784
 x20            0xfffffff31350      281474975863632
 x21            0xf79945200000      272237661782016
 x22            0x1                 1
 x23            0x2                 2
 x24            0xfffffff315f8      281474975864312
 x25            0xf799404b8010      272237580746768
 x26            0xf799409fa600      272237586261504
 x27            0xffff000000000000  -281474976710656
 x28            0xffff000000000002  -281474976710654
 x29            0xfffffff31350      281474975863632
 x30            0xf79954a6c3fc      272237922272252
 sp             0xfffffff311b0      0xfffffff311b0
 pc             0xf79954b77c90      0xf79954b77c90 <JSC::JSCell::toPrimitive(JSC::ExecState*, JSC::PreferredPrimitiveType) const>
 cpsr           0x60000000          [ EL=0 C Z ]
 fpsr           0x0                 0
 fpcr           0x13                19
 (gdb)