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 c...@case.edu http://tiswww.cwru.edu/~chet/
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