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Date: Thu, 30 May 2024 18:29:17 -0400
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Subject: Re: TeX Live 2024:: asympote 2.88-1 hangs after outputting a pdf
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From: Ken Brown via Cygwin <cygwin@cygwin.com>
Reply-To: Ken Brown <kbrown@cornell.edu>
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On 5/30/2024 3:39 PM, Jon Turney via Cygwin wrote:
> On 27/05/2024 16:14, Ken Brown via Cygwin wrote:
>> On 5/27/2024 5:17 AM, Lemures Lemniscati via Cygwin wrote:
>>> On Sun, 26 May 2024 18:02:54 -0400, Ken Brown via Cygwin
>>> Here is a log from gdb. Will it help?
>>>   run
>>>   info threads
>>>   info stack
>>>   list
>>>
>>>
>>> $ HOME=/tmp gdb --args asy -vv -f pdf test
>> [...]
>>> Thread 5 "sig" received signal SIGTRAP, Trace/breakpoint trap.
>>
>> I don't get this SIGRAP when I run the same command.  The program just 
>> runs to completion.  Maybe someone can explain what might cause this.  
>> I have no idea.
> 
> Getting SIGTRAP rather than SIGSEGV or whatever here seems like it might 
> be an unintended consequence of the dumper changes I made in 3.5.0.
> 
>> 0  0x00007ffd8487d313 in KERNELBASE!DebugBreak () from 
>> /cygdrive/c/WINDOWS/System32/KERNELBASE.dll
>> #1  0x00007ffd527f6367 in break_here () at 
>> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/dcrt0.cc:472
>> #2  0x00007ffd52810349 in try_to_debug () at 
>> /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/exceptions.cc:597
>> #3  exception::handle (e=0x28bc6f0, frame=<optimized out>, 
>> in=0x28bc200, dispatch=<optimized out>)
>>     at /usr/src/debug/cygwin-3.5.3-1/winsup/cygwin/exceptions.cc:810
>> #4  0x00007ffd871b49ff in ntdll!.chkstk () from 
>> /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll
>> #5  0x00007ffd8712e466 in ntdll!RtlFindCharInUnicodeString () from 
>> /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll
>> #6  0x00007ffd871b39ee in ntdll!KiUserExceptionDispatcher () from 
>> /cygdrive/c/WINDOWS/SYSTEM32/ntdll.dll
>> #7  0x00007ffd5291bdd4 in init_cygheap::find_tls (this=0x800000000, 
>> sig=20, issig_wait=@0x28bca3f: false)
> 
> The important thing in this backtrace is that an exception is occurring 
> in find_tls, not that we break into the debugging while handling it 
> (rather than rethrowing the exception to let the debugger handle it, 
> which is maybe what should happen? and did in previous versions of 
> Cygwin??)

Thanks.  So find_tls, running in the "sig" thread, is getting an 
exception while Cygwin is trying to process signal 20.  The latter is 
SIGCHLD.  Based on Lem's original report, I would guess that the SIGCHLD 
is generated by ghostscript exiting when it finishes processing the 
file.  An error in processing the signal would explain the fact that asy 
hangs.

I'm not familiar enough with Cygwin's signal-handling code to be able to 
debug this, especially since I can't reproduce the problem.

It would be helpful if others could try Lem's recipe and see if they can 
reproduce it.

Ken

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