Re: [Qemu-devel] [PATCH for-2.7 1/1] ide: fix halted IO segfault at reset

[John Snow <jsnow@redhat.com>]

On 07/27/2016 09:04 AM, Laszlo Ersek wrote:
> On 07/27/16 00:07, John Snow wrote:
>> If one attempts to perform a system_reset after a failed IO request
>> that causes the VM to enter a paused state, QEMU will segfault trying
>> to free up the pending IO requests.
>>
>> These requests have already been completed and freed, though, so all
>> we need to do is free them before we enter the paused state.
>>

s|free them|null them| ... will fix on commit.

>> Existing AHCI tests verify that halted requests are still resumed
>> successfully after a STOP event.
>>
>> Signed-off-by: John Snow <jsnow@redhat.com>
>> ---
>>  hw/ide/core.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/hw/ide/core.c b/hw/ide/core.c
>> index 081c9eb..d117b7c 100644
>> --- a/hw/ide/core.c
>> +++ b/hw/ide/core.c
>> @@ -823,6 +823,7 @@ static void ide_dma_cb(void *opaque, int ret)
>>      }
>>      if (ret < 0) {
>>          if (ide_handle_rw_error(s, -ret, ide_dma_cmd_to_retry(s->dma_cmd))) {
>> +            s->bus->dma->aiocb = NULL;
>>              return;
>>          }
>>      }
>>
> 
> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
> 
> Should this be a candidate for 2.6 stable?
> 
> Thanks
> Laszlo
> 

You're right. I'll do a [RESEND] to -stable, thanks.

And since I neglected to mention it in the commit message, thanks to
Laszlo Ersek here for an excellent diagnostic on the cause of the segfault.

--js