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Re: [Qemu-block] [PATCH] iotests: Wait for qemu to end in 223

From: Eric Blake
Subject: Re: [Qemu-block] [PATCH] iotests: Wait for qemu to end in 223
Date: Wed, 6 Mar 2019 07:04:44 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1

On 3/6/19 7:03 AM, Alberto Garcia wrote:
> On Tue 05 Mar 2019 07:29:08 PM CET, Eric Blake wrote:
>> When iotest 223 was first written, it didn't matter if we waited for
>> the qemu process to clean up. But with the introduction of a later
>> qemu-nbd process trying to reuse the same file, there is a race where
>> even though the asynchronous qemu process has responded to "quit", it
>> has not yet had time to unlock the file and exit, resulting in:
>> -[{ "start": 0, "length": 65536, "depth": 0, "zero": false, "data": false},
>> -{ "start": 65536, "length": 2031616, "depth": 0, "zero": false, "data": 
>> true},
>> -{ "start": 2097152, "length": 2097152, "depth": 0, "zero": false, "data": 
>> false}]
>> +qemu-nbd: Failed to blk_new_open 'tests/qemu-iotests/scratch/t.qcow2': 
>> Failed to get shared "write" lock
>> +Is another process using the image [tests/qemu-iotests/scratch/t.qcow2]?
>> +qemu-img: Could not open 
>> 'driver=nbd,server.type=unix,server.path=tests/qemu-iotests/scratch/qemu-nbd.sock,x-dirty-bitmap=qemu:dirty-bitmap:b':
>>  Failed to connect socket tests/qemu-iotests/scratch/qemu-nbd.sock: 
>> Connection refused
>> +./common.nbd: line 33: kill: (11122) - No such process
>> Fixes: ddd09448
>> Reported-by: Alberto Garcia <address@hidden>
>> Signed-off-by: Eric Blake <address@hidden>
> Tested-by: Alberto Garcia <address@hidden>

Thanks; will queue through my NBD tree this week.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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