Bug 20615 – GC spinlock crash

Thread 2 received signal SIGSEGV, Segmentation fault. (gdb) backtrace #0 0x00007ffff7ddf242 in do_lookup_x ( undef_name=undef_name@entry=0x7ffff7678b0f "_D4core6atomic__T10atomicLoadVEQBdQBb11MemoryOrderi0TmZQBmFNaNbNiNfKOxmZm", new_hash=new_hash@entry=447189232, old_hash=old_hash@entry=0x7ffff7fe2080, ref=0x7ffff74feda0, result=result@entry=0x7ffff7fe2090, scope=0x7ffff7ffe428, i=0, version=0x0, flags=5, skip=0x0, type_class=1, undef_map=0x7ffff7ff6000) at dl-lookup.c:338 #1 0x00007ffff7de01ef in _dl_lookup_symbol_x ( undef_name=0x7ffff7678b0f "_D4core6atomic__T10atomicLoadVEQBdQBb11MemoryOrderi0TmZQBmFNaNbNiNfKOxmZm", undef_map=0x7ffff7ff6000, ref=ref@entry=0x7ffff7fe2128, symbol_scope=0x7ffff7ff6358, version=0x0, type_class=type_class@entry=1, flags=5, skip_map=<optimized out>) at dl-lookup.c:813 #2 0x00007ffff7de4ec3 in _dl_fixup (l=<optimized out>, reloc_arg=<optimized out>) at ../elf/dl-runtime.c:112 #3 0x00007ffff7dec70a in _dl_runtime_resolve_xsave () at ../sysdeps/x86_64/dl-trampoline.h:125 #4 0x00007ffff79c9755 in core.internal.spinlock.SpinLock.lock() shared () from /home/user/dlang/dmd-2.087.1/linux/lib64/libphobos2.so.0.87 #5 0x00007ffff79d7209 in _D2gc4impl12conservativeQw3Gcx__T11ToScanStackTSQBuQBuQBsQCdQBi__T9ScanRangeVbi0ZQpZQBz9popLockedMFNbNiKQCfZb () from /home/user/dlang/dmd-2.087.1/linux/lib64/libphobos2.so.0.87 #6 0x00007ffff79da240 in _D2gc4impl12conservativeQw3Gcx__T4markVbi0Vbi1ZQoMFNbNlSQCcQCcQCaQClQBq__T9ScanRangeVbi0ZQpZv () from /home/user/dlang/dmd-2.087.1/linux/lib64/libphobos2.so.0.87 #7 0x00007ffff79da5ac in _D2gc4impl12conservativeQw3Gcx__T21pullFromScanStackImplVbi0ZQBcMFNbZv () from /home/user/dlang/dmd-2.087.1/linux/lib64/libphobos2.so.0.87 #8 0x00007ffff79d4a39 in _D2gc4impl12conservativeQw3Gcx14scanBackgroundMFNbZv () from /home/user/dlang/dmd-2.087.1/linux/lib64/libphobos2.so.0.87 #9 0x00007ffff79c1acf in _D4core6thread20createLowLevelThreadFNbNiDFNbZvkDFNbZvZ20thread_lowlevelEntryUNbPvZQd () from /home/user/dlang/dmd-2.087.1/linux/lib64/libphobos2.so.0.87 #10 0x00007ffff72776db in start_thread (arg=0x7ffff7fe5700) at pthread_create.c:463 #11 0x00007ffff65de88f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Happens while running lots of unittests at random moments, sometimes it doesn't crash at all.

This has probably been fixed in more recent versions, see their changelogs.

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