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[PATCH] xfstests 228: suppress core dump message

To: xfs-oss <xfs@xxxxxxxxxxx>
Subject: [PATCH] xfstests 228: suppress core dump message
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Wed, 09 Jun 2010 10:23:51 -0500
Cc: Amit Arora <aarora@xxxxxxxxxx>
User-agent: Thunderbird (Macintosh/20100228)
When running 228 with abrt on in rhel6, I was getting different
output due to a (core dumped) message on SIGXFSZ.  For some reason
I wasn't able to use sed to filter it, and just ulimit -c 0 didn't
suppress it either.

abrt sets the core pattern to:

"|/usr/libexec/abrt-hook-ccpp /var/spool/abrt %p %s %u %c""

which apparently allows core dumps even if ulimit -c is 0, due
to the pipe.

Temporarily changing the kernel's core pattern to just plain "core"
and setting ulimit -c to 0 does suppress it.  These are reset to
original values after the test is run.

Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxxx>

--- 228.orig    2010-06-09 11:13:27.000000000 -0400
+++ 228 2010-06-09 11:19:57.000000000 -0400
@@ -31,6 +31,8 @@
        cd /
        rm -f $tmp.*
+       sysctl -w kernel.core_pattern="$core_pattern" &>/dev/null
+       ulimit -c $ulimit_c
@@ -58,6 +60,12 @@
 avail=`df -P $TEST_DIR | awk 'END {print $4}'`
 [ "$avail" -ge 104000 ] || _notrun "Test device is too small ($avail KiB)"
+# Suppress core dumped messages
+core_pattern=`sysctl kernel.core_pattern | awk -F = '{print $NF}'`
+ulimit_c=`ulimit -c`
+sysctl -w kernel.core_pattern=core &>/dev/null
+ulimit -c 0
 # Set the FSIZE ulimit to 100MB and check
 ulimit -f 102400
 flim=`ulimit -f`

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