[LTP] [PATCH 2/2] tst_test.sh: Fix IPC init for checkpoints

[Avinesh Kumar]

Hi,

Tested-by: Avinesh Kumar <akumar@suse.de>

cn_pec 1 TINFO: Running: cn_pec.sh 
cn_pec 1 TINFO: Tested kernel: Linux susetest 6.15.3-1-default #1 SMP PREEMPT_DYNAMIC Sat Jun 21 19:19:18 UTC 2025 (d7f7d34) x86_64 x86_64 x86_64 GNU/Linux
cn_pec 1 TINFO: Using /tmp/LTP_cn_pec.Gsup5b4iUP as tmpdir (tmpfs filesystem)
cn_pec 1 TINFO: timeout per run is 0h 5m 0s
cn_pec 1 TINFO: Test process events connector
cn_pec 1 TINFO: Testing fork event (nevents=10)
cn_pec 1 TPASS: All events detected
cn_pec 2 TINFO: Testing exec event (nevents=10)
cn_pec 2 TPASS: All events detected
cn_pec 3 TINFO: Testing exit event (nevents=10)
cn_pec 3 TPASS: All events detected
cn_pec 4 TINFO: Testing uid event (nevents=10)
cn_pec 4 TPASS: All events detected
cn_pec 5 TINFO: Testing gid event (nevents=10)
cn_pec 5 TPASS: All events detected


Regards,
Avinesh

On Friday, June 27, 2025 12:29:57 PM CEST Cyril Hrubis wrote:
> The introduction of magic at the start of the LTP IPC region did break
> the checkpoints for the tst_test.sh shell library. The reason is that
> the library creates the IPC backing file with dd and the magic wasn't
> present there.
> 
> This introduced failures in the pec testcases:
> 
>   cn_pec 1 TINFO: Test process events connector
>   cn_pec 1 TINFO: Testing fork event (nevents=10)
>   tst_test.c:203: TBROK: Invalid shared memory region (bad magic)
>   cn_pec 1 TBROK: tst_checkpoint wait 10000 0 failed
> 
> This patch fixes the tst_test.sh library so that the IPC region is
> created with a correct magic.
> 
> Follow-up: bf9589d5bd ("lib: moves test infrastructure states into a shared context structure")
> Reported-by: Avinesh Kumar <akumar@suse.de>
> Signed-off-by: Cyril Hrubis <chrubis@suse.cz>
> ---
>  testcases/lib/tst_test.sh | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/testcases/lib/tst_test.sh b/testcases/lib/tst_test.sh
> index c32bd8b19..4be10a4f9 100644
> --- a/testcases/lib/tst_test.sh
> +++ b/testcases/lib/tst_test.sh
> @@ -627,6 +627,7 @@ _tst_init_checkpoints()
>  		tst_brk TBROK "tst_getconf PAGESIZE failed"
>  	fi
>  	ROD_SILENT dd if=/dev/zero of="$LTP_IPC_PATH" bs="$pagesize" count=1
> +	ROD_SILENT "printf LTPM | dd of="$LTP_IPC_PATH" bs=1 seek=0 conv=notrunc"
>  	ROD_SILENT chmod 600 "$LTP_IPC_PATH"
>  	export LTP_IPC_PATH
>  }
>