https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82670
Bug ID: 82670
Summary: UBSAN bootstrap broken after recent libsanitizer merge
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: jakub at gcc dot gnu.org
Target Milestone: ---
Looks they recently added wrappers for signal-related functions:
/home/marxin/BIG/buildbot/slave/gcc-master-bootstrap-ubsan/build/builddir/./gcc/xgcc
-B/home/marxin/BIG/buildbot/slave/gcc-master-bootstrap-ubsan/build/builddir/./gcc/
-dumpspecs > tmp-specs
/bin/sh: line 1: 7075 Segmentation fault (core dumped)
/home/marxin/BIG/buildbot/slave/gcc-master-bootstrap-ubsan/build/builddir/./gcc/xgcc
-B/home/marxin/BIG/buildbot/slave/gcc-master-bootstrap-ubsan/build/builddir/./gcc/
-dumpspecs > tmp-specs
make[3]: *** [Makefile:2037: specs] Error 139
It fails here:
│0x60335b <__interceptor_signal(int, void*)+11>
callq 0x605010 <__sanitizer::GetHandleSignalMode(int)>
│0x603360 <__interceptor_signal(int, void*)+16>
cmp $0x2,%eax
│0x603363 <__interceptor_signal(int, void*)+19>
je 0x603376 <__interceptor_signal(int, void*)+38>
│0x603365 <__interceptor_signal(int, void*)+21>
add $0x8,%rsp
│0x603369 <__interceptor_signal(int, void*)+25>
mov %rbp,%rsi
│0x60336c <__interceptor_signal(int, void*)+28>
mov %ebx,%edi
│0x60336e <__interceptor_signal(int, void*)+30>
pop %rbx
│0x60336f <__interceptor_signal(int, void*)+31>
pop %rbp
>│0x603370 <__interceptor_signal(int, void*)+32>
jmpq *0x3e9f22(%rip) # 0x9ed298
<_ZN14__interception11real_signalE>
It's strange because it should basically jump to
_ZN14__interception11real_signalE, but it's somehow zeroed:
Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
