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Date:	Mon, 8 Nov 2021 13:52:58 -0500
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Subject:	Re: Another pipe-related problem?
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From:	Ken Brown via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	Ken Brown <kbrown AT cornell DOT edu>
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On 11/8/2021 9:35 AM, Ken Brown via Cygwin wrote:
> On 11/8/2021 8:12 AM, Henry S. Thompson via Cygwin wrote:
>> Running on Windows-10 21H1
>>
>> With Cygwin 3.3.0 and 3.3.1 I get a hang every time I try to launch XEmacs:
>>
>> #0  0x00007ffdf31cd474 in ntdll!ZwQueryTimer ()
>>     from /c/Windows/SYSTEM32/ntdll.dll
>> #1  0x00000001800479fa in cygwait (object=<optimized out>, timeout=0xffff09a0,
>>      timeout AT entry=0x0, mask=mask AT entry=5)
>>      at 
>> /usr/x86_64-pc-cygwin/sys-root/usr/include/w32api/psdk_inc/intrin-impl.h:838
>> #2  0x000000018008f716 in cygwait (mask=<optimized out>,
>>      howlong=<optimized out>, h=<optimized out>)
>>      at /usr/src/debug/cygwin-3.3.1-1/winsup/cygwin/cygwait.h:45
>> #3  cygwait (howlong=<optimized out>, h=<optimized out>)
>>      at /usr/src/debug/cygwin-3.3.1-1/winsup/cygwin/cygwait.h:51
>> #4  fhandler_pipe::raw_read (this=0x18034fe80, ptr=0xffff0bc0,
>>      len=@0xffff0b40: 128)
>>      at /usr/src/debug/cygwin-3.3.1-1/winsup/cygwin/fhandler_pipe.cc:296
>> #5  0x0000000180069244 in fhandler_base::read (this=0x18034fe80,
>>      in_ptr=0xffff0bc0, len=@0xffff0b40: 128)
>>      at /usr/src/debug/cygwin-3.3.1-1/winsup/cygwin/fhandler.cc:819
>> #6  0x000000018013ffcc in read (fd=3, ptr=0xffff0bc0, len=<optimized out>)
>>      at /usr/src/debug/cygwin-3.3.1-1/winsup/cygwin/dtable.h:64
>> #7  0x000000018018e88b in _sigfe () at sigfe.s:35
>> #8  0x000000010066a11d in retry_read_1 (fildes=3, buf=0xffff0bc0, nbyte=128,
>>      allow_quit=0) at sysdep.c:2425
>> #9  0x000000010066a171 in retry_read (fildes=3, buf=0xffff0bc0, nbyte=128)
>>      at sysdep.c:2437
>> #10 0x0000000100494d86 in drain_signal_event_pipe () at event-unixoid.c:159
>> #11 0x000000010056d1dc in mswindows_need_event (badly_p=1) at event-msw.c:1432
>>
>> This is an old executable, has worked since 2015 (!), but recompiling
>> didn't help.  Reverting to 3.2 lets it run again.
> 
> This backtrace doesn't match the source of Cygwin's XEmacs package (which exists 
> on 32-bit Cygwin only), so I assume you built this yourself, using a different 
> version of XEmacs.  Cygwin's XEmacs doesn't hang for me.
> 
> Please provide build instructions for the version you compiled.  Your backtrace 
> shows that fhandler_pipe::raw_read is blocked waiting for a mutex

Alternatively, XEmacs might be in an infinite loop starting at frame 8 or 9, 
repeatedly trying to read and failing because it can't get the mutex.  Either 
way, we need the sources in order to go further.

Ken

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