[Bug libstdc++/97936] New: [11 Regression] 30_threads/latch/3.cc hangs

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97936

            Bug ID: 97936
           Summary: [11 Regression] 30_threads/latch/3.cc hangs
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
  Target Milestone: ---

On Linux/x86-64 with 96 cores, r11-5227 with -m32 compiles30_threads/latch/3.cc
into:

2850299 hjl       20   0   23804   2364   2192 R  99.7   0.0 240:37.77 3.exe

(gdb) bt
#0  0xf7f9155d in __kernel_vsyscall ()
#1  0xf7babd7b in syscall () from /lib/libc.so.6
#2  0x08049566 in std::__detail::__platform_wait<int> (__val=<optimized out>, 
    __addr=<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:99
#3  std::__atomic_wait<int, std::latch::wait() const::{lambda()#1}>(int const*,
int, std::latch::wait() const::{lambda()#1}) (__addr=0xff85ea30, __old=1, 
    __pred=...)
    at
/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/32/libstdc++-v3/include/bits/atomic_wait.h:276
#4  0x08049883 in std::latch::wait (this=0xff85ea30)
    at
/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/32/libstdc++-v3/include/latch:75
#5  std::latch::arrive_and_wait (__update=1, this=0xff85ea30)
    at
/export/gnu/import/git/gcc-test-master-intel64-native/bld/x86_64-pc-linux-gnu/32/libstdc++-v3/include/latch:82
#6  test01 ()
    at
/export/gnu/import/git/gcc-test-master-intel64-native/src-master/libstdc++-v3/testsuite/30_threads/latch/3.cc:43
#7  0x080492ef in main ()
    at
/export/gnu/import/git/gcc-test-master-intel64-native/src-master/libstdc++-v3/testsuite/30_threads/latch/3.cc:66
(gdb) 

futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
futex(0xff85ea30, FUTEX_WAIT_PRIVATE, 1, NULL) = -1 EAGAIN (Resource
temporarily unavailable)