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Re: Can't debug bash with gdb 8.2.1-1

On 22/07/2019 15:59, Ken Brown wrote:
With the test version of gdb, attempting to debug bash fails as follows:

$ gdb bash
GNU gdb (GDB) (Cygwin 8.2.1-1) 8.2.1
Reading symbols from bash...Reading symbols from
(gdb) r -c ls
Starting program: /usr/bin/bash -c ls
/usr/bin/bash: initialize_job_control: getpgrp failed: No error
[Inferior 1 (process 31876) exited with code 01]

This problem doesn't occur with gdb-8.1.1-1.
Thanks for reporting this.

I had also tripped over this problem recently: It seems that changes in gdb (bisection lands on [1]) mean that any call to getpgrp() in the inferior fails (this can be demonstrated with a test program that just calls that).

I believe this is behaviour is caused by some kind of defect in the cygwin DLL, but I haven't made much progress in investigating it. (I don't really understand how the inferior gets into a state where getpgrp() fails, which isn't really supposed to happen...)


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