https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100182
--- Comment #37 from H.J. Lu <hjl.tools at gmail dot com> ---
I still see 32-bit test hang at random on Skylake server:
(gdb) bt
#0 0xf7fc655d in __kernel_vsyscall ()
#1 0xf7bac46b in syscall () from /lib/libc.so.6
#2 0x0804995d in std::__detail::__platform_wait<int> (
__addr=0x804d680 <std::__detail::__waiter_pool_base::_S_for(void
const*)::__w+1472>, __val=3)
at
/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/32/libstdc++-v3/include/bits/atomic_wait.h:104
#3 0x08049e3a in std::__detail::__waiter_pool::_M_do_wait (__old=3,
__addr=0x804d680 <std::__detail::__waiter_pool_base::_S_for(void
const*)::__w+1472>, this=<optimized out>)
at
/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/32/libstdc++-v3/include/bits/atomic_wait.h:261
#4 std::__detail::__waiter<std::integral_constant<bool, true>
>::_M_do_wait_v<unsigned int, std::__atomic_impl::wait<unsigned int>(unsigned
int const*, std::remove_volatile<unsigned int>::type,
std::memory_order)::{lambda()#1}>(unsigned int,
std::__atomic_impl::wait<unsigned int>(unsigned int const*,
std::remove_volatile<unsigned int>::type, std::memory_order)::{lambda()#1})
(__vfn=...,
__old=42, this=<synthetic pointer>)
at
/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/32/libstdc++-v3/include/bits/atomic_wait.h:400
#5 std::__atomic_wait_address_v<unsigned int,
std::__atomic_impl::wait<unsigned int>(unsigned int const*,
std::remove_volatile<unsigned int>::type,
std::memory_order)::{lambda()#1}>(unsigned int const*, unsigned int,
std::__atomic_impl::wa--Type <RET> for more, q to quit, c to continue without
paging--
it<unsigned int>(unsigned int const*, std::remove_volatile<unsigned int>::type,
std::memory_order)::{lambda()#1}) (__addr=0xffeb402c, __old=42, __vfn=...)
at
/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/32/libstdc++-v3/include/bits/atomic_wait.h:430
#6 0x08049ef2 in std::__atomic_impl::wait<unsigned int> (
__m=std::memory_order::seq_cst, __old=<optimized out>,
__ptr=<optimized out>)
at
/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/32/libstdc++-v3/include/bits/atomic_base.h:1018
#7 std::__atomic_ref<unsigned int, true, false>::wait (
__m=std::memory_order::seq_cst, __old=<optimized out>, this=0xffeb4034)
at
/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/32/libstdc++-v3/include/bits/atomic_base.h:1570
#8 test<unsigned int> (va=0, vb=42)
at
/export/gnu/import/git/gcc-test-master-intel64-native/src-master/libstdc++-v3/testsuite/29_atomics/atomic_ref/wait_notify.cc:44
#9 0x0804926b in main ()
at
/export/gnu/import/git/gcc-test-master-intel64-native/src-master/libstdc++-v3/testsuite/29_atomics/atomic_ref/wait_notify.cc:54
(gdb)
GCC was configured with
--with-arch=native --with-cpu=native --prefix=/usr/12.0.0 --enable-clocale=gnu
--with-system-zlib --enable-shared --enable-cet --with-demangler-in-ld
--enable-libmpx --with-multilib-list=m32,m64,mx32 --with-fpmath=sse
It happens about once a few weeks.
