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Date: Wed, 15 May 2024 14:24:19 -0600
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Subject: Re: cygwin application hangs on closing console
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From: Brian Inglis via Cygwin <cygwin AT cygwin DOT com>
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On 2024-05-15 09:48, Johannes Khoshnazar-Thoma via Cygwin wrote:
> Hi again,
> 
> Am 15.05.24 um 17:37 schrieb Johannes Khoshnazar-Thoma:
>> Hi again,
>>
>> Am 23.04.24 um 12:26 schrieb Takashi Yano:
>>>>> Thanks for the report. Could you please test cygwin1.dll 3.5.3-1
>>>>> wihch is the latest cygwin release?
>>>>>
>>
>> We retried the tests with cygwin1.dll 3.5.3-1 and it looks like
>> the issue is still there. Here's an excerpt from the gdb debug
>> session:
>>
> Sorry somehow the formatting got messed up I try again:
> 
> (gdb) info thread
>    Id   Target Id         Frame
> * 1    Thread 0x11cc     0x00007ffe579d5ea4 in ntdll!ZwWaitForSingleObject () 
> from C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
>    2    Thread 0x8ec      0x00007ffe579d5ee4 in ntdll!ZwReadFile () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
>    3    Thread 0x55c      0x00007ffe579d5ea4 in ntdll!ZwWaitForSingleObject () 
> from C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
>    4    Thread 0x131c     0x00007ffe579d95f4 in 
> ntdll!ZwWaitForWorkViaWorkerFactory () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
>    5    Thread 0x9b8      0x00007ffe579d95f4 in 
> ntdll!ZwWaitForWorkViaWorkerFactory () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> (gdb) thread 1
> [Switching to thread 1 (Thread 0x11cc)]
> #0  0x00007ffe579d5ea4 in ntdll!ZwWaitForSingleObject () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> (gdb) bt
> #0  0x00007ffe579d5ea4 in ntdll!ZwWaitForSingleObject () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #1  0x00007ffe54156d1f in WaitForSingleObjectEx () from 
> C:\src\dlls-syms\KERNELBASE.dll\660F5EEC21e000\KERNELBASE.dll
> #2  0x00007ffe4a2033a0 in fhandler_console::close (this=0x800009030) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/fhandler/console.cc:1914
> #3  0x00007ffe4a1f6ce7 in fhandler_base::close_with_arch (this=0x800009030) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/fhandler/base.cc:1288
> #4  0x00007ffe4a26a4cd in init_cygheap::close_ctty (this=0x800000000) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/mm/cygheap.cc:135
> #5  0x00007ffe4a1c7c4e in close_all_files (norelease=norelease AT entry=false) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/syscalls.cc:81
> #6  0x00007ffe4a146840 in do_exit (status=0) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/dcrt0.cc:1128
> #7  0x00007ffe4a1469f7 in _exit (n=<optimized out>) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/dcrt0.cc:1243
> #8  0x00007ffe4a2a4bb9 in exit (code=0) at 
> /usr/src/debug/cygwin-3.5.3-1/newlib/libc/stdlib/exit.c:65
> #9  0x00007ffe4a1469e7 in cygwin_exit (n=5392) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/dcrt0.cc:1237
> #10 0x00007ffe4a14809a in dll_crt0_1 () at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/dcrt0.cc:1002
> #11 0x00007ffe4a145e08 in _cygtls::call2 (this=0x7ffffce00, func=0x7ffe4a146fb8 
> <dll_crt0_1(void*)>, arg=0x0, buf=buf AT entry=0x7ffffcdf0) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygtls.cc:41
> #12 0x00007ffe4a145e86 in _cygtls::call (func=<optimized out>, arg=<optimized 
> out>) at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygtls.cc:28
> #13 0x0000000000000000 in ?? ()
> (gdb) thread 2
> [Switching to thread 2 (Thread 0x8ec)]
> #0  0x00007ffe579d5ee4 in ntdll!ZwReadFile () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> (gdb) bt
> #0  0x00007ffe579d5ee4 in ntdll!ZwReadFile () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #1  0x00007ffe5415e704 in ReadFile () from 
> C:\src\dlls-syms\KERNELBASE.dll\660F5EEC21e000\KERNELBASE.dll
> #2  0x00007ffe4a1bada6 in wait_sig () at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/sigproc.cc:1324
> #3  0x00007ffe4a144d5f in cygthread::callfunc (this=this AT entry=0x7ffe4a335560 
> <threads>, issimplestub=issimplestub AT entry=false) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygthread.cc:48
> #4  0x00007ffe4a145270 in cygthread::stub (arg=arg AT entry=0x7ffe4a335560 
> <threads>) at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygthread.cc:91
> #5  0x00007ffe4a145e08 in _cygtls::call2 (this=0xdbce00, func=0x7ffe4a1451ea 
> <cygthread::stub(void*)>, arg=0x7ffe4a335560 <threads>, buf=buf AT entry=0xdbcd50) 
> at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygtls.cc:41
> #6  0x00007ffe4a145e86 in _cygtls::call (func=<optimized out>, arg=<optimized 
> out>) at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygtls.cc:28
> #7  0x00007ffe555584d4 in KERNEL32!BaseThreadInitThunk () from 
> C:\src\dlls-syms\kernel32.dll\640993B0ad000\kernel32.dll
> #8  0x00007ffe57981791 in ntdll!RtlUserThreadStart () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #9  0x0000000000000000 in ?? ()
> (gdb) thread 3
> [Switching to thread 3 (Thread 0x55c)]
> #0  0x00007ffe579d5ea4 in ntdll!ZwWaitForSingleObject () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> (gdb) bt
> #0  0x00007ffe579d5ea4 in ntdll!ZwWaitForSingleObject () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #1  0x00007ffe54156d1f in WaitForSingleObjectEx () from 
> C:\src\dlls-syms\KERNELBASE.dll\660F5EEC21e000\KERNELBASE.dll
> #2  0x00007ffe4a1452ab in cygthread::stub (arg=arg AT entry=0x7ffe4a3355b8 
> <threads+88>) at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygthread.cc:112
> #3  0x00007ffe4a145e08 in _cygtls::call2 (this=0x2aece00, func=0x7ffe4a1451ea 
> <cygthread::stub(void*)>, arg=0x7ffe4a3355b8 <threads+88>, 
> buf=buf AT entry=0x2aecd50) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygtls.cc:41
> #4  0x00007ffe4a145e86 in _cygtls::call (func=<optimized out>, arg=<optimized 
> out>) at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygtls.cc:28
> #5  0x00007ffe555584d4 in KERNEL32!BaseThreadInitThunk () from 
> C:\src\dlls-syms\kernel32.dll\640993B0ad000\kernel32.dll
> #6  0x00007ffe57981791 in ntdll!RtlUserThreadStart () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #7  0x0000000000000000 in ?? ()
> (gdb) thread 4
> [Switching to thread 4 (Thread 0x131c)]
> #0  0x00007ffe579d95f4 in ntdll!ZwWaitForWorkViaWorkerFactory () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> (gdb) bt
> #0  0x00007ffe579d95f4 in ntdll!ZwWaitForWorkViaWorkerFactory () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #1  0x00007ffe5794eb5e in ntdll!RtlReleaseSRWLockExclusive () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #2  0x00007ffe4a145e08 in _cygtls::call2 (this=0x323ce00, func=0x7ffe5794e3f0 
> <ntdll!RtlReleaseSRWLockExclusive+8704>, arg=0xc0b60, buf=buf AT entry=0x323cd50) 
> at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygtls.cc:41
> #3  0x00007ffe4a145e86 in _cygtls::call (func=<optimized out>, arg=<optimized 
> out>) at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygtls.cc:28
> #4  0x00007ffe555584d4 in KERNEL32!BaseThreadInitThunk () from 
> C:\src\dlls-syms\kernel32.dll\640993B0ad000\kernel32.dll
> #5  0x00007ffe57981791 in ntdll!RtlUserThreadStart () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #6  0x0000000000000000 in ?? ()
> (gdb) thread 5
> [Switching to thread 5 (Thread 0x9b8)]
> #0  0x00007ffe579d95f4 in ntdll!ZwWaitForWorkViaWorkerFactory () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> (gdb) bt
> #0  0x00007ffe579d95f4 in ntdll!ZwWaitForWorkViaWorkerFactory () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #1  0x00007ffe5794eb5e in ntdll!RtlReleaseSRWLockExclusive () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #2  0x00007ffe4a145e08 in _cygtls::call2 (this=0x343ce00, func=0x7ffe5794e3f0 
> <ntdll!RtlReleaseSRWLockExclusive+8704>, arg=0xc0b60, buf=buf AT entry=0x343cd50) 
> at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygtls.cc:41
> #3  0x00007ffe4a145e86 in _cygtls::call (func=<optimized out>, arg=<optimized 
> out>) at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/cygtls.cc:28
> #4  0x00007ffe555584d4 in KERNEL32!BaseThreadInitThunk () from 
> C:\src\dlls-syms\kernel32.dll\640993B0ad000\kernel32.dll
> #5  0x00007ffe57981791 in ntdll!RtlUserThreadStart () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> #6  0x0000000000000000 in ?? ()
> (gdb) thread 6
> Unknown thread 6.
> (gdb) thread 1
> [Switching to thread 1 (Thread 0x11cc)]
> #0  0x00007ffe579d5ea4 in ntdll!ZwWaitForSingleObject () from 
> C:\src\dlls-syms\ntdll.dll\6502806A1cf000\ntdll.dll
> (gdb) up
> #1  0x00007ffe54156d1f in WaitForSingleObjectEx () from 
> C:\src\dlls-syms\KERNELBASE.dll\660F5EEC21e000\KERNELBASE.dll
> (gdb)
> #2  0x00007ffe4a2033a0 in fhandler_console::close (this=0x800009030) at 
> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/fhandler/console.cc:1914
> 1914    in /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/fhandler/console.cc
> (gdb) p thread_sync_event
> $6 = (HANDLE) 0x1510
> (gdb) p name
> $7 = "cygcons.thread_sync.0", '\000' <repeats 19 times>, "r", '\000' <repeats 
> 183 times>...
> (gdb) p con.owner
> No symbol "con" in current context.
> (gdb) p master_thread_started
> $8 = true
> (gdb) p unit
> $9 = 0
> (gdb) p shared_console_info
> $10 = {0x1a0030000, 0x0 <repeats 64 times>}
> (gdb)

Sometimes a Cygwin strace can be helpful, for example:

	$ strace -o drbdadm.strace drbdadm <ARGS>

or equivalent however you execute the program.

Attach the strace output as text if possible, otherwise if too big, xz, bz2, lz, 
zstd, gz.

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry

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