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Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test
From: |
Fam Zheng |
Subject: |
Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039 |
Date: |
Tue, 13 May 2014 20:43:21 +0800 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Tue, 05/13 13:30, Markus Armbruster wrote:
> Fam Zheng <address@hidden> writes:
>
> > On Tue, 05/13 10:46, Markus Armbruster wrote:
> >> The shell script attempts to suppress core dumps like this:
> >>
> >> old_ulimit=$(ulimit -c)
> >> ulimit -c 0
> >> $QEMU_IO arg...
> >> ulimit -c "$old_ulimit"
> >>
> >> This breaks the test hard unless the limit was zero to begin with!
> >> ulimit sets both hard and soft limit by default, and (re-)raising the
> >> hard limit requires privileges. Broken since it was added in commit
> >> dc68afe.
> >>
> >> Could be fixed by adding -S to set only the soft limit, but I'm not
> >> sure how portable that is in practice. Simply do it in a subshell
> >> instead, like this:
> >>
> >> (ulimit -c 0; exec $QEMU_IO arg...)
> >>
> >> Signed-off-by: Markus Armbruster <address@hidden>
> >> ---
> >> tests/qemu-iotests/039 | 18 ++++++------------
> >> 1 file changed, 6 insertions(+), 12 deletions(-)
> >>
> >> diff --git a/tests/qemu-iotests/039 b/tests/qemu-iotests/039
> >> index b9cbe99..182b0f0 100755
> >> --- a/tests/qemu-iotests/039
> >> +++ b/tests/qemu-iotests/039
> >> @@ -67,10 +67,8 @@ echo "== Creating a dirty image file =="
> >> IMGOPTS="compat=1.1,lazy_refcounts=on"
> >> _make_test_img $size
> >>
> >> -old_ulimit=$(ulimit -c)
> >> -ulimit -c 0 # do not produce a core dump on abort(3)
> >> -$QEMU_IO -c "write -P 0x5a 0 512" -c "abort" "$TEST_IMG" | _filter_qemu_io
> >> -ulimit -c "$old_ulimit"
> >> +(ulimit -c 0 # do not produce a core dump on abort(3)
> >> +exec $QEMU_IO -c "write -P 0x5a 0 512" -c "abort" "$TEST_IMG") |
> >> _filter_qemu_io
> >
> > This works well.
> >
> > But when I try to put this in a function to avoid repeating:
> >
> > function _no_dump_exec()
> > {
> > (ulimit -c 0; exec "$@")
> > }
> >
> > _no_dump_exec $QEMU_IO -c "write -P 0x5a 0 512" -c "abort" "$TEST_IMG")
> > | _filter_qemu_io
> >
> > it doesn't work:
> >
> > 039 1s ... - output mismatch (see 039.out.bad)
> > --- 039.out 2014-05-13 12:10:39.248866480 +0800
> > +++ 039.out.bad 2014-05-13 17:19:46.161986618 +0800
> > @@ -9,6 +9,7 @@
> >
> > == Creating a dirty image file ==
> > Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
> > +./039: line 51: 10517 Aborted "$@"
> > wrote 512/512 bytes at offset 0
> > 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
> > incompatible_features 0x1
> >
> > Any idea what the difference is here?
>
> Full patch of your version, please.
Here it goes:
diff --git a/tests/qemu-iotests/039 b/tests/qemu-iotests/039
index b9cbe99..27544f9 100755
--- a/tests/qemu-iotests/039
+++ b/tests/qemu-iotests/039
@@ -47,6 +47,13 @@ _supported_os Linux
_default_cache_mode "writethrough"
_supported_cache_modes "writethrough"
+function _no_dump_exec()
+{
+ (
+ ulimit -c 0
+ "$@")
+}
+
size=128M
echo
@@ -67,10 +74,7 @@ echo "== Creating a dirty image file =="
IMGOPTS="compat=1.1,lazy_refcounts=on"
_make_test_img $size
-old_ulimit=$(ulimit -c)
-ulimit -c 0 # do not produce a core dump on abort(3)
-$QEMU_IO -c "write -P 0x5a 0 512" -c "abort" "$TEST_IMG" | _filter_qemu_io
-ulimit -c "$old_ulimit"
+_no_dump_exec $QEMU_IO -c "write -P 0x5a 0 512" -c "abort" "$TEST_IMG" |
_filter_qemu_io
# The dirty bit must be set
./qcow2.py "$TEST_IMG" dump-header | grep incompatible_features
- [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039, Markus Armbruster, 2014/05/13
- Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039, Fam Zheng, 2014/05/13
- Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039, Markus Armbruster, 2014/05/13
- Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039,
Fam Zheng <=
- Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039, Markus Armbruster, 2014/05/13
- Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039, Eric Blake, 2014/05/13
- Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039, Kevin Wolf, 2014/05/14
- Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039, Markus Armbruster, 2014/05/14
- Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039, Markus Armbruster, 2014/05/14
- Re: [Qemu-devel] [PATCH] qemu-iotests: Fix core dump suppression in test 039, Kevin Wolf, 2014/05/14