Hi, 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. The commit ( https://git.savannah.gnu.org/cgit/bash.git/commit/?h=bash-4.4&id=a0c0a00fc419b7bc08202a79134fcd5bc0427071) seems to have fixed it. I am looking to figure out the particular fix that fixed this issue from the above commit and to backport to bash4-2 version. Is it a known issue? Could you help to identify the change set that fixed the issue from the commit "a0c0a00fc419b"? Thanks in advance. Regards, Sam
