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Message-ID:	<a78cee42-8e4b-42bb-a1a7-6041a52bcb9f@dronecode.org.uk>
Date:	Thu, 22 May 2025 14:30:32 +0100
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User-Agent:	Mozilla Thunderbird
Subject:	Re: bash::SIGSEGV in timegm () from D:\cygwin64\bin\cygwin1.dll
To:	Gary Liddle <gary DOT liddle AT me DOT com>
References:	<BFCB9648-7807-40C3-BC82-713A9648F06D AT me DOT com>
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From:	Jon Turney via Cygwin <cygwin AT cygwin DOT com>
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On 22/05/2025 14:15, Gary Liddle via Cygwin wrote:
> Yesterday I updated Cygwin using  setup-x86_64 to the latest non test release, and bash —login would no longer start.
> 
> It turns out bash won’t start for me when a .profile runs a sub-command.
> 
> This is highlighted by:-
> 
> 	gdb bash
> 	dll cygwin1.dll
> 	b timegm
> 	run
> 	bash-5.2$ echo foo
> 	foo
> 	bash-5.2$ a=`echo foo`
> 
> 	Program received signal SIGSEGV, Segmentation fault.
> 	0x00007ffa5cb3ce31 in timegm () from D:\cygwin64\bin\cygwin1.dll
> 	(gdb)
> 	...
> 	bash-5.2$ a=`xxx`
> 	bash: xxx: command not found
> 	
> 	Program received signal SIGSEGV, Segmentation fault.
> 	0x00007ffa5cb3ce31 in timegm () from D:\cygwin64\bin\cygwin1.dll
> 	(gdb)
> 
> 	uname -a CYGWIN_NT-10.0-26100 garyl 3.7.0-0.98.gb39b510c1ce6.x86_64 2025-05-18 15:52 UTC x86_64 Cygwin
> 
[...]

Thanks for reporting this.


> I am at a loss as to how to dig further because gdb doesn’t seem to want to go near timegm and I can’t see anything in the strace output that seems to point to anything useful.

The information in [1] may be helpful in investigating further with gdb.

[1] https://cygwin.com/faq.html#faq.programming.debugging-cygwin


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