> On 22 May 2025, at 14:30, Jon Turney <jon.tur...@dronecode.org.uk> wrote:
>
> 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
>
Thanks for the link, but all the .dbg programmes segfault in:-
ie bash.exe.dbg
mainCRTStartup () at
/usr/src/debug/cygwin-3.4.10-1/winsup/cygwin/crt0.c:16
for all versions (which might be a clue?).
, but the "set cygwin-exceptions on” produces a bit more.
gdb bash
Reading symbols from /usr/lib/debug//usr/bin/bash.exe.dbg...
(gdb) set cygwin-exceptions on
(gdb) run
Starting program: /usr/bin/bash
bash-5.2$ a=`ls`
Thread 1 "bash" received signal SIGSEGV, Segmentation fault.
sigdelayed () at sigfe.s:124
124 movl %ebx,0x24(%rsp)
(gdb)
(gdb) where
#0 sigdelayed () at sigfe.s:124
#1 0x000000010042db0b in wait_for (pid=<optimized out>,
flags=<error reading variable: Cannot access memory at address
0xfffffffdffffbf08>)
at /usr/src/debug/bash-5.2.21-1/jobs.c:3208
Backtrace stopped: Cannot access memory at address 0xfffffffdffffbef8
…
Which looks very not helpful.
Regards
Gary
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