K 10
svn:author
V 3
dim
K 8
svn:date
V 27
2021-12-22T10:12:05.025903Z
K 7
svn:log
V 971
Temporarily disable libunwind's FrameHeaderCache, until there is a
resolution for <https://bugs.llvm.org/show_bug.cgi?id=47181>.

The cache implementation depends on dl_iterate_phdr(3) ensuring that its
callbacks are not called simultaneously for multiple threads, but that
is only the case for the dl_iterate_phdr() implementation in rtld.

In a statically linked executable, libc's dl_iterate_phdr() is used,
which does no such locking. If multiple threads then call into the
unwinder at the same time, it is possible to trigger a segfault.

In particular, the statically linked lld which is built during the
cross-tools stage can segfault in this way, because it starts multiple
worker threads that can exit in parallel. Since our pthread_exit(3)
invokes the unwinder, it will therefore call into it in parallel too.

(cherry picked from commit 9ff1cc58cd72f7109ae728ca32935cf9e8ca8ced)

Git Hash:   9185066430a022a520dd8812dca34c8411c7e8aa
Git Author: dim@FreeBSD.org
END