https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94936
Bug ID: 94936
Summary: pmr::synchronized_pool_resource crashes without
-pthread
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Target Milestone: ---
#include <memory_resource>
// g++ -std=c++17 segfault.cc -o segfault
int main()
{
std::pmr::synchronized_pool_resource pool;
}
This dies in the constructor:
synchronized_pool_resource::
synchronized_pool_resource(const pool_options& opts,
memory_resource* upstream)
: _M_impl(opts, upstream)
{
if (int err = __gthread_key_create(&_M_key, destroy_TPools))
__throw_system_error(err);
exclusive_lock l(_M_mx);
_M_tpools = _M_alloc_shared_tpools(l);
}
Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) up
#1 0x00007ffff7f5aeca in __gthread_key_create (__dtor=0x7ffff7f5aa90
<std::pmr::destroy_TPools(void*)>, __key=0x7fffffffd7c0) at
/home/jwakely/src/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu/bits/gthr-default.h:708
#2 std::pmr::synchronized_pool_resource::synchronized_pool_resource
(this=0x7fffffffd780, opts=..., upstream=<optimized out>) at
/home/jwakely/src/gcc/gcc/libstdc++-v3/src/c++17/memory_resource.cc:1136
__gthread_key_create doesn't check __ghtread_active_p before calling
pthread_key_create, so calls an undefined weak symbol if not linked to
libpthread.
