https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103069
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
nptl/pthread_create.c has
do
pd->nextevent = __nptl_last_event;
while (atomic_compare_and_exchange_bool_acq (&__nptl_last_event,
pd, pd->nextevent));
we got
8d1b7: 48 8b 05 da 55 16 00 mov 0x1655da(%rip),%rax
8d1be: 48 89 83 68 06 00 00 mov %rax,0x668(%rbx)
8d1c5: f0 4c 0f b1 35 ca 55 lock cmpxchg %r14,0x1655ca(%rip)
8d1ce: 75 e7 jne 8d1b7
<pthread_create@@GLIBC_2.34
+0xb57>
