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[Qemu-devel] [PATCH v3 1/4] virtio-blk: avoid dataplane VirtIOBlockReq e
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH v3 1/4] virtio-blk: avoid dataplane VirtIOBlockReq early free |
Date: |
Wed, 9 Jul 2014 10:05:46 +0200 |
VirtIOBlockReq is freed later by virtio_blk_free_request() in
hw/block/virtio-blk.c. Remove this extraneous g_slice_free().
This patch fixes the following segfault:
0x00005555556373af in virtio_blk_rw_complete (opaque=0x5555565ff5e0, ret=0)
at hw/block/virtio-blk.c:99
99 bdrv_acct_done(req->dev->bs, &req->acct);
(gdb) print req
$1 = (VirtIOBlockReq *) 0x5555565ff5e0
(gdb) print req->dev
$2 = (VirtIOBlock *) 0x0
(gdb) bt
#0 0x00005555556373af in virtio_blk_rw_complete (opaque=0x5555565ff5e0,
ret=0) at hw/block/virtio-blk.c:99
#1 0x0000555555840ebe in bdrv_co_em_bh (opaque=0x5555566152d0) at
block.c:4675
#2 0x000055555583de77 in aio_bh_poll (address@hidden) at async.c:81
#3 0x000055555584b7a7 in aio_poll (ctx=0x5555563a8150, address@hidden) at
aio-posix.c:188
#4 0x00005555556e520e in iothread_run (opaque=0x5555563a7fd8) at
iothread.c:41
#5 0x00007ffff42ba124 in start_thread () from /usr/lib/libpthread.so.0
#6 0x00007ffff16d14bd in clone () from /usr/lib/libc.so.6
Reported-by: Max Reitz <address@hidden>
Cc: Fam Zheng <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
Tested-by: Christian Borntraeger <address@hidden>
---
hw/block/dataplane/virtio-blk.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/hw/block/dataplane/virtio-blk.c b/hw/block/dataplane/virtio-blk.c
index 4bc0729..bed9f13 100644
--- a/hw/block/dataplane/virtio-blk.c
+++ b/hw/block/dataplane/virtio-blk.c
@@ -68,7 +68,6 @@ static void complete_request_vring(VirtIOBlockReq *req,
unsigned char status)
vring_push(&req->dev->dataplane->vring, req->elem,
req->qiov.size + sizeof(*req->in));
notify_guest(req->dev->dataplane);
- g_slice_free(VirtIOBlockReq, req);
}
static void handle_notify(EventNotifier *e)
--
1.9.3