Re: bash-4-2 issue

[Chet Ramey]

On 1/10/24 5:33 PM, Grisha Levit wrote:
> On Mon, Jan 8, 2024 at 7:04 AM Sam Kappen via Bug reports for the GNU
> Bourne Again SHell <bug-bash@gnu.org> wrote:
> > We see that bash throws the "Operation not permitted" error when doing
> > chained pipe operation
> > along with a debug trap.
> >
> > We set a debug trap here "my_debug" to save the terminal commands entered.
> > The GNU bash, version used is  4.2.
> >
> > root@freescale-p2020ds:~/dir#  ls -l | grep a | grep b | grep c
> > -sh: child setpgid (4238 to 4232): Operation not permitted
> >
> >
> > root@freescale-p2020ds:~/dir# trap
> > trap -- '' TSTP
> > trap -- '' TTIN
> > trap -- '' TTOU
> > trap -- 'my_debug' DEBUG
> > root@freescale-p2020ds:~/dir#
> >
> > Platform: Linux 3.10 kernel on PPC target.
> >
> > It seems setpgid is failing because the process group of the pipeline does
> > not exist at that time.
> >
> > This issue is not seen on bash version 4.4.
>
> I'm not sure this is fixed. In all versions, including 4.2, 4.4, 5.2, and the
> current devel version, I see what seems to be the same error, triggered by a
> pipeline when job control is enabled and the DEBUG trap executes an external
> command.

I can't reproduce this on RHEL 9, which is running Linux kernel version 5.
PGRP_PIPE is defined because the BASH_SYS_PGRP_SYNC test enables it.

--
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    chet@case.edu    http://tiswww.cwru.edu/~chet/

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