On 08/06/2012 03:12 PM, Avi Kivity wrote:
> On 08/06/2012 11:46 AM, Stefan Priebe - Profihost AG wrote:
>
>> But still i got the segfault and core dump - this is my main problem? I
>> mean qemu-kvm master isn't declared as stable. So i don't care about the
>> slowness here.
>>
>> What can we do about the core dump and crash?
>
> Okay, I reproduced it; it seems aio=native is the culprit. You can try
> aio=threads as a workaround.
>
> Copying some relevant people (context: aio=native on qemu-kvm-1.1.1
> segfaults pretty early during guest install)
>
The following ought to fix it:
From: Avi Kivity <avi@xxxxxxxxxx>
Date: Mon, 6 Aug 2012 15:35:02 +0300
Subject: [PATCH] virtio-mlk: fix use-after-free while handling scsi commands
The scsi passthrough handler falls through after completing a
request into the failure path, resulting in a use after free.
Reprducible by running a guest with aio=native on a block device.
Reported-by: Stefan Priebe <s.priebe@xxxxxxxxxxxx>
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index f21757e..552b3b6 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -254,6 +254,7 @@ static void virtio_blk_handle_scsi(VirtIOBlockReq *req)
virtio_blk_req_complete(req, status);
g_free(req);
+ return;
#else
abort();
#endif
--
error compiling committee.c: too many arguments to function
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