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* [Bug libstdc++/97485] New: std::call_once crashes at runtime on glibc if not linked to libpthread:
@ 2020-10-19 7:10 slyfox at gcc dot gnu.org
2020-10-19 7:14 ` [Bug libstdc++/97485] std::call_once crashes at runtime on glibc if not linked to libpthread: terminate called after throwing an instance of 'std::system_error': what(): Unknown error -1 slyfox at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: slyfox at gcc dot gnu.org @ 2020-10-19 7:10 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97485
Bug ID: 97485
Summary: std::call_once crashes at runtime on glibc if not
linked to libpthread:
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: slyfox at gcc dot gnu.org
Target Milestone: ---
Initially bug was reported as a crash of llvm-tblgen tool:
https://bugs.gentoo.org/749162.
Small reproducer:
$ cat a.cc
#include <mutex>
static std::once_flag of;
static std::recursive_mutex * pm = nullptr;
int main() {
std::call_once(of, []() { pm = new std::recursive_mutex; });
}
$ g++-10.2.0 a.cc -o a -ggdb3 && ./a
terminate called after throwing an instance of 'std::system_error'
what(): Unknown error -1
Aborted (core dumped)
$ g++-10.2.0 a.cc -o a -pthread && ./a
All gcc versions are affected (at least 6.5.0 and above).
Backtrace:
"""
Reading symbols from ./a...
(gdb) run
Starting program: /tmp/a
terminate called after throwing an instance of 'std::system_error'
what(): Unknown error -1
Program received signal SIGABRT, Aborted.
__GI_raise (sig=<optimized out>) at ../sysdeps/unix/sysv/linux/raise.c:49
49 return ret;
(gdb) bt
#0 __GI_raise (sig=<optimized out>) at ../sysdeps/unix/sysv/linux/raise.c:49
#1 0x00007ffff7a1c536 in __GI_abort () at abort.c:79
#2 0x00007ffff7dad961 in __gnu_cxx::__verbose_terminate_handler ()
at
/usr/src/debug/sys-devel/gcc-11.0.0_pre9999/gcc-11.0.0_pre9999/libstdc++-v3/libsupc++/vterminate.cc:95
#3 0x00007ffff7ddcd9a in __cxxabiv1::__terminate (handler=<optimized out>)
at
/usr/src/debug/sys-devel/gcc-11.0.0_pre9999/gcc-11.0.0_pre9999/libstdc++-v3/libsupc++/eh_terminate.cc:48
#4 0x00007ffff7ddce05 in std::terminate () at
/usr/src/debug/sys-devel/gcc-11.0.0_pre9999/gcc-11.0.0_pre9999/libstdc++-v3/libsupc++/eh_terminate.cc:58
#5 0x00007ffff7ddd098 in __cxxabiv1::__cxa_throw (obj=<optimized out>,
tinfo=0x7ffff7f6f948 <typeinfo for std::system_error>,
dest=0x7ffff7e0a570 <std::system_error::~system_error()>)
at
/usr/src/debug/sys-devel/gcc-11.0.0_pre9999/gcc-11.0.0_pre9999/libstdc++-v3/libsupc++/eh_throw.cc:95
#6 0x00007ffff7db0c7f in std::__throw_system_error (__i=-1)
at
/usr/src/debug/sys-devel/gcc-11.0.0_pre9999/build/x86_64-pc-linux-gnu/libstdc++-v3/include/ext/new_allocator.h:89
#7 0x000055555555531d in std::call_once<main()::<lambda()> >(std::once_flag &,
struct {...} &&) (__once=..., __f=...)
at /usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/include/g++-v10/mutex:743
#8 0x000055555555521a in main () at a.cc:7
"""
https://stackoverflow.com/questions/8649828/what-are-the-correct-link-options-to-use-stdthread-in-gcc-under-linux
suggests -pthread has to be used.
Would it be feasible to convert this error as any of:
1. Link-time error that would complain about missing pthread_once symbol.
2. Successful run if libpthread is not present (probably not easy as libpthread
can be loaded dynamically at a later point in program's runtime).
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/97485] std::call_once crashes at runtime on glibc if not linked to libpthread: terminate called after throwing an instance of 'std::system_error': what(): Unknown error -1
2020-10-19 7:10 [Bug libstdc++/97485] New: std::call_once crashes at runtime on glibc if not linked to libpthread: slyfox at gcc dot gnu.org
@ 2020-10-19 7:14 ` slyfox at gcc dot gnu.org
2020-10-19 7:23 ` slyfox at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: slyfox at gcc dot gnu.org @ 2020-10-19 7:14 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97485
Sergei Trofimovich <slyfox at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Host| |x86_64-pc-linux-gnu
--- Comment #1 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
$ LANG=C gcc-11.0.0 -v
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc-11.0.0
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-11.0.0_pre9999/work/gcc-11.0.0_pre9999/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/11.0.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/11.0.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/11.0.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/11.0.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/11.0.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/11.0.0/include/g++-v11
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/11.0.0/python
--enable-languages=c,c++,go,jit,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 11.0.0_pre9999 p4, commit
6b55fa29adf4d643e61388bf01a4509b0b041d17' --disable-esp --enable-libstdcxx-time
--enable-host-shared --enable-shared --enable-threads=posix
--enable-__cxa_atexit --enable-clocale=gnu --enable-multilib
--with-multilib-list=m32,m64 --disable-fixed-point --enable-targets=all
--enable-libgomp --disable-libssp --disable-libada --disable-systemtap
--enable-valgrind-annotations --enable-vtable-verify --without-zstd
--enable-lto --with-isl --disable-isl-version-check --enable-default-pie
--enable-default-ssp
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20201015 (experimental) (Gentoo 11.0.0_pre9999 p4, commit
6b55fa29adf4d643e61388bf01a4509b0b041d17)
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/97485] std::call_once crashes at runtime on glibc if not linked to libpthread: terminate called after throwing an instance of 'std::system_error': what(): Unknown error -1
2020-10-19 7:10 [Bug libstdc++/97485] New: std::call_once crashes at runtime on glibc if not linked to libpthread: slyfox at gcc dot gnu.org
2020-10-19 7:14 ` [Bug libstdc++/97485] std::call_once crashes at runtime on glibc if not linked to libpthread: terminate called after throwing an instance of 'std::system_error': what(): Unknown error -1 slyfox at gcc dot gnu.org
@ 2020-10-19 7:23 ` slyfox at gcc dot gnu.org
2020-10-19 12:56 ` redi at gcc dot gnu.org
2020-10-19 22:07 ` slyfox at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: slyfox at gcc dot gnu.org @ 2020-10-19 7:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97485
--- Comment #2 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
AFAIU '-1' comes from
https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libgcc/gthr-posix.h;h=965247602acf11f81c5fa009c7ee48eb55cbacca;hb=HEAD#l696
696 static inline int
697 __gthread_once (__gthread_once_t *__once, void (*__func) (void))
698 {
699 if (__gthread_active_p ())
700 return __gthrw_(pthread_once) (__once, __func);
701 else
702 return -1;
703 }
where '__gthread_active_p ()' returns false:
(gdb) call __gthread_active_p()
$2 = 0
That is defined in
https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libgcc/gthr-posix.h;h=965247602acf11f81c5fa009c7ee48eb55cbacca;hb=HEAD#l236
236 #ifdef __GLIBC__
237 __gthrw2(__gthrw_(__pthread_key_create),
238 __pthread_key_create,
239 pthread_key_create)
240 # define GTHR_ACTIVE_PROXY __gthrw_(__pthread_key_create)
241 #elif defined (__BIONIC__)
242 # define GTHR_ACTIVE_PROXY __gthrw_(pthread_create)
243 #else
244 # define GTHR_ACTIVE_PROXY __gthrw_(pthread_cancel)
245 #endif
246
247 static inline int
248 __gthread_active_p (void)
249 {
250 static void *const __gthread_active_ptr
251 = __extension__ (void *) >HR_ACTIVE_PROXY;
252 return __gthread_active_ptr != 0;
253 }
Both of symbols are weak, unbound to libpthread and unversioned (for
non-working case):
$ g++-11.0.0 a.cc -o a && x86_64-pc-linux-gnu-nm -D a | fgrep -i pthread
w __pthread_key_create
w pthread_once
$ g++-11.0.0 a.cc -o a -pthread && x86_64-pc-linux-gnu-nm -D a | fgrep -i
pthread
w __pthread_key_create@@GLIBC_2.2.5
w pthread_once@@GLIBC_2.2.5
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/97485] std::call_once crashes at runtime on glibc if not linked to libpthread: terminate called after throwing an instance of 'std::system_error': what(): Unknown error -1
2020-10-19 7:10 [Bug libstdc++/97485] New: std::call_once crashes at runtime on glibc if not linked to libpthread: slyfox at gcc dot gnu.org
2020-10-19 7:14 ` [Bug libstdc++/97485] std::call_once crashes at runtime on glibc if not linked to libpthread: terminate called after throwing an instance of 'std::system_error': what(): Unknown error -1 slyfox at gcc dot gnu.org
2020-10-19 7:23 ` slyfox at gcc dot gnu.org
@ 2020-10-19 12:56 ` redi at gcc dot gnu.org
2020-10-19 22:07 ` slyfox at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: redi at gcc dot gnu.org @ 2020-10-19 12:56 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97485
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Looks like a dup of PR 55394
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/97485] std::call_once crashes at runtime on glibc if not linked to libpthread: terminate called after throwing an instance of 'std::system_error': what(): Unknown error -1
2020-10-19 7:10 [Bug libstdc++/97485] New: std::call_once crashes at runtime on glibc if not linked to libpthread: slyfox at gcc dot gnu.org
` (2 preceding siblings ...)
2020-10-19 12:56 ` redi at gcc dot gnu.org
@ 2020-10-19 22:07 ` slyfox at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: slyfox at gcc dot gnu.org @ 2020-10-19 22:07 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97485
Sergei Trofimovich <slyfox at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #4 from Sergei Trofimovich <slyfox at gcc dot gnu.org> ---
Ah, yes!
*** This bug has been marked as a duplicate of bug 55394 ***
^ permalink raw reply [flat|nested] 5+ messages in thread
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2020-10-19 7:10 [Bug libstdc++/97485] New: std::call_once crashes at runtime on glibc if not linked to libpthread: slyfox at gcc dot gnu.org
2020-10-19 7:14 ` [Bug libstdc++/97485] std::call_once crashes at runtime on glibc if not linked to libpthread: terminate called after throwing an instance of 'std::system_error': what(): Unknown error -1 slyfox at gcc dot gnu.org
2020-10-19 7:23 ` slyfox at gcc dot gnu.org
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