rorth wrote:
Since this patch, all asan tests loop on Solaris. This had been hidden for a
bit by an unrelated extended build breakage on the bots, but now every `ninja
check-all` on the Solaris/amd64 bot times out. I could trace this to this
patch.
E.g. when running
`projects/compiler-rt/test/asan/I386SunOSConfig/TestCases/Output/alloca_big_alignment.cpp.tmp`,
I get the expected output
```
=================================================================
==22223==ERROR: AddressSanitizer: dynamic-stack-buffer-overflow on address
0xfeffd88a at pc 0x0812907d bp 0xfeffd7f4 sp 0xfeffd7ec
WRITE of size 1 at 0xfeffd88a thread T0
```
and afterwards the test loops. `truss` shows an unending series of
```
22210: yield() = 0
22210: yield() = 0
22210: yield() = 0
```
and `pstack` gives
```
22213: /var/llvm/local-amd64-release-stage2-A-flang-492214/tools/clang/stage2
fdfbebc5 yield (0x8139158, 0x8109558, 0x818a580, 0x0, 0x5dd, 0x8139158) + 15
0810cd32 __sanitizer::FutexWait(__sanitizer::atomic_uint32_t*, unsigned int)
(0xfe00a000, 0xfdebdd56, 0x805ad7c, 0xfdfa0107, 0xfeffc68c, 0x5) + 12
080f4952 __asan::InstallAtForkHandler()::$_0::__invoke() (0xfde26fc0, 0x7,
0xfe010200, 0xfe010140, 0x7, 0x5) + 12
fdfa49c8 forkx (0x0, 0xfe5ad000, 0x89f, 0xfdfa4b8c) + c8
fdfa4b9d fork (0x8139158, 0x811563e, 0xfeffc720, 0xfd6007a0, 0x4,
0x8139158) + 1d
0810ccd2 __sanitizer::internal_fork() () + 12
```
This seems no wonder given that `sanitizer_common/sanitizer_solaris.cpp` has
```
void FutexWait(atomic_uint32_t *p, u32 cmp) {
// FIXME: implement actual blocking.
sched_yield();
}
```
`sanitizer_mac.cpp` is the same, btw., and even `sanitizer_linux.cpp` has
```
# if !SANITIZER_SOLARIS
void FutexWait(atomic_uint32_t *p, u32 cmp) {
# if SANITIZER_FREEBSD
_umtx_op(p, UMTX_OP_WAIT_UINT, cmp, 0, 0);
# elif SANITIZER_NETBSD
sched_yield(); /* No userspace futex-like synchronization */
# else
internal_syscall(SYSCALL(futex), (uptr)p, FUTEX_WAIT_PRIVATE, cmp, 0, 0, 0);
# endif
}
```
so even NetBSD would be affected.
https://github.com/llvm/llvm-project/pull/75290
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