* [Qemu-devel] [PATCH for-3.0] qcow: fix a reference leak
@ 2018-07-25 18:07 KONRAD Frederic
2018-07-26 9:33 ` Kevin Wolf
0 siblings, 1 reply; 2+ messages in thread
From: KONRAD Frederic @ 2018-07-25 18:07 UTC (permalink / raw)
To: qemu-devel
Cc: peter.maydell, kwolf, mreitz, qemu-block, qemu-stable, KONRAD Frederic
Since 42a3e1ab367cdf38cce093de24eb406b99a4ef96 qemu asserts when using the
vvfat driver:
git clone git://qemu.org/qemu.git
cd qemu
./configure --target-list=ppc-softmmu --enable-debug
make -j8
mkdir foo
touch foo/hello
./ppc-softmmu/qemu-system-ppc -M prep --nographic --monitor null \
-hda fat:rw:./foo
"Ctrl-C"
qemu-system-ppc: block.c:3368: bdrv_close_all: Assertion \
`((&all_bdrv_states)->tqh_first == ((void *)0))' failed.
This is because we reference bs twice in qcow_co_create(..) one time in
bdrv_open_blockdev_ref(..) and in blk_insert_bs(..) but we unref it only once
in blk_unref which leads to the reference leak.
Note that I didn't tested much QCOW after this change as I don't use it much.
Signed-off-by: KONRAD Frederic <frederic.konrad@adacore.com>
---
block/qcow.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/block/qcow.c b/block/qcow.c
index 102d058..385d935 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -938,6 +938,7 @@ static int coroutine_fn qcow_co_create(BlockdevCreateOptions *opts,
ret = 0;
exit:
blk_unref(qcow_blk);
+ bdrv_unref(bs);
qcrypto_block_free(crypto);
return ret;
}
--
1.8.3.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Qemu-devel] [PATCH for-3.0] qcow: fix a reference leak
2018-07-25 18:07 [Qemu-devel] [PATCH for-3.0] qcow: fix a reference leak KONRAD Frederic
@ 2018-07-26 9:33 ` Kevin Wolf
0 siblings, 0 replies; 2+ messages in thread
From: Kevin Wolf @ 2018-07-26 9:33 UTC (permalink / raw)
To: KONRAD Frederic
Cc: qemu-devel, peter.maydell, mreitz, qemu-block, qemu-stable
Am 25.07.2018 um 20:07 hat KONRAD Frederic geschrieben:
> Since 42a3e1ab367cdf38cce093de24eb406b99a4ef96 qemu asserts when using the
> vvfat driver:
>
> git clone git://qemu.org/qemu.git
> cd qemu
> ./configure --target-list=ppc-softmmu --enable-debug
> make -j8
> mkdir foo
> touch foo/hello
> ./ppc-softmmu/qemu-system-ppc -M prep --nographic --monitor null \
> -hda fat:rw:./foo
>
> "Ctrl-C"
>
> qemu-system-ppc: block.c:3368: bdrv_close_all: Assertion \
> `((&all_bdrv_states)->tqh_first == ((void *)0))' failed.
>
> This is because we reference bs twice in qcow_co_create(..) one time in
> bdrv_open_blockdev_ref(..) and in blk_insert_bs(..) but we unref it only once
> in blk_unref which leads to the reference leak.
>
> Note that I didn't tested much QCOW after this change as I don't use it much.
>
> Signed-off-by: KONRAD Frederic <frederic.konrad@adacore.com>
Thanks, applied to the block branch.
Kevin
^ permalink raw reply [flat|nested] 2+ messages in thread
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2018-07-25 18:07 [Qemu-devel] [PATCH for-3.0] qcow: fix a reference leak KONRAD Frederic
2018-07-26 9:33 ` Kevin Wolf
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