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	Mon, 20 May 2024 01:43:14 -0700 (PDT)
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Date:	Mon, 20 May 2024 17:42:42 +0900
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Subject:	Re: Segfault with detached threads and OpenSSL
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Deter using detached attribute in cygwin. for details [1].
You might find static-linking as useful workaround for this issue which 
requires build openssl from source code.

Thread 7 "a" hit Breakpoint 9, init_thread_remove_handlers (
     handsin=handsin AT entry=0x0) at crypto/initthread.c:178
178         if (!CRYPTO_THREAD_write_lock(gtr->lock))
(gdb) bt
#0  init_thread_remove_handlers (handsin=handsin AT entry=0x0)
     at crypto/initthread.c:178
#1  0x00000005e03029c3 in OPENSSL_thread_stop () at crypto/initthread.c:235
#2  0x00000005e03009c3 in DllMain (hinstDLL=<optimized out>,
     fdwReason=<optimized out>, lpvReserved=<optimized out>)
     at crypto/dllmain.c:38
#3  0x00007ff976c49a1d in ntdll!RtlActivateActivationContextUnsafeFast ()
    from /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll
#4  0x00007ff976c475b6 in ntdll!LdrShutdownThread ()
    from /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll
#5  0x00007ff976c8468e in ntdll!RtlExitUserThread ()
    from /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll
#6  0x00007ff8e81ec987 in exit_thread (res=res AT entry=0x0)
     at ../../.././winsup/cygwin/sigproc.cc:544
#7  0x00007ff8e81d470e in pthread::exit (this=0xa00028b90,
     value_ptr=<optimized out>) at ../../.././winsup/cygwin/thread.cc:584
#8  0x00007ff8e81d4549 in pthread::thread_init_wrapper (arg=0xa00028b90)
     at ../../.././winsup/cygwin/thread.cc:2016
#9  0x00007ff8e8174681 in pthread_wrapper (arg=<optimized out>)
     at ../../.././winsup/cygwin/create_posix_thread.cc:79
#10 pthread_wrapper (arg=<optimized out>)
     at ../../.././winsup/cygwin/create_posix_thread.cc:39


[1]
(gdb) li ../../.././winsup/cygwin/thread.cc:558
553       pthread_key::run_all_destructors ();
554
555       mutex.lock ();
556       // cleanup if thread is in detached state and not joined
557       if (equal (joiner, thread))
558         delete this;
559       else
560         {
561           valid = false;
562           return_ptr = value_ptr;

On 5/20/2024 6:29 AM, Rodrigo Arias via Cygwin wrote:
> Thread 6 "p" received signal SIGSEGV, Segmentation fault.
> [Switching to Thread 7332.0x21dc]
> 0x0000000000000000 in ?? ()


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