Bug 100851 - Using std::thread on Alpine Linux/musl causes SIGABRT after main when unloading a shared library.
Summary: Using std::thread on Alpine Linux/musl causes SIGABRT after main when unloadi...
Alias: None
Product: gcc
Classification: Unclassified
Component: libstdc++ (show other bugs)
Version: 10.2.1
: P3 normal
Target Milestone: ---
Assignee: Not yet assigned to anyone
Depends on:
Reported: 2021-06-01 09:03 UTC by michaldrozd
Modified: 2021-09-09 08:03 UTC (History)
1 user (show)

See Also:
Known to work:
Known to fail:
Last reconfirmed:

Code sample to reproduce the issue (387 bytes, text/x-csrc)
2021-06-01 09:03 UTC, michaldrozd

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Description michaldrozd 2021-06-01 09:03:23 UTC
Created attachment 50901 [details]
Code sample to reproduce the issue

The provided sample crashes somewhere after exiting from main with the following backtrace (this is the best I could get):

	Thread 1 "a.out" received signal SIGABRT, Aborted.
	__restore_sigs (set=set@entry=0x7ffe4a7eac00) at ./arch/x86_64/syscall_arch.h:40
	40      ./arch/x86_64/syscall_arch.h: No such file or directory.
	(gdb) bt
	#0  __restore_sigs (set=set@entry=0x7ffe4a7eac00) at ./arch/x86_64/syscall_arch.h:40
	#1  0x00007f9b8c44750d in raise (sig=sig@entry=6) at src/signal/raise.c:11
	#2  0x00007f9b8c41df25 in abort () at src/exit/abort.c:11
	#3  0x00007f9b8c22ab53 in __deregister_frame_info_bases () from /usr/lib/libgcc_s.so.1
	#4  0x00007f9b8c3d9c5e in __do_global_dtors_aux () from /usr/lib/libpaho-mqtt3cs.so.1
	#5  0x000055c817f69294 in test(void*) ()
	#6  0x00007f9b8c497880 in ?? () from /lib/ld-musl-x86_64.so.1
	#7  0x00007f9b8c497b48 in builtin_tls () from /lib/ld-musl-x86_64.so.1
	#8  0x00007f9b8c3f5d97 in ?? () from /usr/lib/libpaho-mqtt3cs.so.1
	#9  0x0000000000000000 in ?? ()

I'm not sure the problem is isolated to the libpaho library, but this is the only one I could reproduce this behaviour with (related libpaho issue report: https://github.com/eclipse/paho.mqtt.c/issues/1110). I've been testing with the latest libpaho v1.3.9 (https://github.com/eclipse/paho.mqtt.c/releases/tag/v1.3.9), it needs to be compiled and installed with:
	make install

Both commenting out the std::thread and replacing it with pthread calls make this issue go away.

OS: Alpine Linux v3.13
Compiler: gcc (Alpine 10.2.1_pre1)
Musl version: musl-1.2.2
Comment 1 Andrew Pinski 2021-09-09 06:36:23 UTC
Dup of bug 91737.

*** This bug has been marked as a duplicate of bug 91737 ***
Comment 2 Andrew Pinski 2021-09-09 06:38:10 UTC
Or maybe not.
Comment 3 Andrew Pinski 2021-09-09 06:38:56 UTC
Or maybe it was caused by PR 91737.
Comment 4 michaldrozd 2021-09-09 08:03:36 UTC
PR 91737 seems similar enough to be related
I've narrowed it down to the -Wl,-init functionality, if you comment out this lines it exits cleanly.
Interestingly enough if you edit the function https://github.com/eclipse/paho.mqtt.c/blob/master/src/MQTTClient.c#L119 to do absolutely nothing it still aborts, so it seems it's something with the init functionality itself, not this specific function