Re: [Qemu-devel] [PATCH v2 00/12] block: qiov_offset parameter for io

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

22.08.2019 18:50, Stefan Hajnoczi wrote:
> On Tue, Jun 04, 2019 at 07:15:02PM +0300, Vladimir Sementsov-Ogievskiy wrote:
>> Hi all!
>>
>> Here is new parameter qiov_offset for io path, to avoid
>> a lot of places with same pattern of creating local_qiov or hd_qiov
>> variables.
>>
>> These series also includes my
>> "[Qemu-devel] [PATCH 0/2] block/io: refactor padding"
>> with some changes [described in 01 and 03 emails]
>>
>> Vladimir Sementsov-Ogievskiy (12):
>>    util/iov: introduce qemu_iovec_init_extended
>>    util/iov: improve qemu_iovec_is_zero
>>    block/io: refactor padding
>>    block: define .*_part io handlers in BlockDriver
>>    block/io: bdrv_co_do_copy_on_readv: use and support qiov_offset
>>    block/io: bdrv_co_do_copy_on_readv: lazy allocation
>>    block/io: bdrv_aligned_preadv: use and support qiov_offset
>>    block/io: bdrv_aligned_pwritev: use and support qiov_offset
>>    block/io: introduce bdrv_co_p{read,write}v_part
>>    block/qcow2: refactor qcow2_co_preadv to use buffer-based io
>>    block/qcow2: implement .bdrv_co_preadv_part
>>    block/qcow2: implement .bdrv_co_pwritev(_compressed)_part
>>
>>   block/qcow2.h             |   1 +
>>   include/block/block_int.h |  21 ++
>>   include/qemu/iov.h        |  10 +-
>>   block/backup.c            |   2 +-
>>   block/io.c                | 532 ++++++++++++++++++++++----------------
>>   block/qcow2-cluster.c     |  14 +-
>>   block/qcow2.c             | 131 +++++-----
>>   qemu-img.c                |   4 +-
>>   util/iov.c                | 153 +++++++++--
>>   9 files changed, 559 insertions(+), 309 deletions(-)
> 
> qemu-iotests 077 fails after I apply this series (including your
> uninitialized variable fix).  I'm afraid I can't include it in the block
> pull request, sorry!
> 
> Stefan
> 

Hmm, 77 don't work on master for me:
077      fail       [20:23:57] [20:23:59]                    output mismatch (see 077.out.bad)
--- /work/src/qemu/up-block-drop-hd-qiov/tests/qemu-iotests/077.out     2019-04-22 15:06:56.162045432 +0300
+++ /work/src/qemu/up-block-drop-hd-qiov/tests/qemu-iotests/077.out.bad 2019-08-22 20:23:59.124122307 +0300
@@ -1,7 +1,15 @@
  QA output created by 077
+==117186==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases!
+==117186==WARNING: ASan is ignoring requested __asan_handle_no_return: stack top: 0x7ffefc071000; bottom 0x7fad7277b000; size: 0x0051898f6000 (350200225792)
+False positive error reports may follow
+For details see http://code.google.com/p/address-sanitizer/issues/detail?id=189
  Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728

  == Some concurrent requests involving RMW ==
+==117197==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases!
+==117197==WARNING: ASan is ignoring requested __asan_handle_no_return: stack top: 0x7fffa4fcc000; bottom 0x7fa93a2c1000; size: 0x00566ad0b000 (371159248896)
+False positive error reports may follow
+For details see http://code.google.com/p/address-sanitizer/issues/detail?id=189
  wrote XXX/XXX bytes at offset XXX
  XXX bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
  wrote XXX/XXX bytes at offset XXX
@@ -66,6 +74,10 @@
  XXX bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)

  == Verify image content ==
+==117219==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases!
+==117219==WARNING: ASan is ignoring requested __asan_handle_no_return: stack top: 0x7ffc722de000; bottom 0x7f0848232000; size: 0x00f42a0ac000 (1048677367808)
+False positive error reports may follow
+For details see http://code.google.com/p/address-sanitizer/issues/detail?id=189
  read 512/512 bytes at offset 0
  512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
  read 512/512 bytes at offset 512
@@ -156,5 +168,9 @@
  1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
  read 2048/2048 bytes at offset 71680
  2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+==117229==WARNING: ASan doesn't fully support makecontext/swapcontext functions and may produce false positives in some cases!
+==117229==WARNING: ASan is ignoring requested __asan_handle_no_return: stack top: 0x7fffa3342000; bottom 0x7fd85a275000; size: 0x0027490cd000 (168729300992)
+False positive error reports may follow
+For details see http://code.google.com/p/address-sanitizer/issues/detail?id=189
  No errors were found on the image.
  *** done
Failures: 077
Failed 1 of 1 tests



-- 
Best regards,
Vladimir