Stefan Hajnoczi 2cdff7f620 linux-aio: avoid deadlock in nested aio_poll() calls ...

If two Linux AIO request completions are fetched in the same
io_getevents() call, QEMU will deadlock if request A's callback waits
for request B to complete using an aio_poll() loop.  This was reported
to happen with the mirror blockjob.

This patch moves completion processing into a BH and makes it resumable.
Nested event loops can resume completion processing so that request B
will complete and the deadlock will not occur.

Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Ming Lei <ming.lei@canonical.com>
Cc: Marcin Gibuła <m.gibula@beyond.pl>
Reported-by: Marcin Gibuła <m.gibula@beyond.pl>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Tested-by: Marcin Gibuła <m.gibula@beyond.pl>

2014-08-29 15:59:17 +01:00

..

archipelago.c

block: Use g_new() & friends where that makes obvious sense

2014-08-20 11:51:28 +02:00

backup.c

block/backup: Fix hang for unaligned image size

2014-07-09 15:50:11 +02:00

blkdebug.c

blkdebug: Delete BH in bdrv_aio_cancel

2014-08-22 11:07:00 +02:00

blkverify.c

blkverify: Implement bdrv_refresh_filename()

2014-08-20 14:31:56 +02:00

bochs.c

block: Use g_new() & friends to avoid multiplying sizes

2014-08-20 11:51:28 +02:00

cloop.c

cloop: Handle failure for potentially large allocations

2014-08-15 15:07:15 +02:00

commit.c

block: extend block-commit to accept a string for the backing file

2014-07-01 10:47:01 +02:00

cow.c

block/cow: Avoid use of uninitialized cow_bs in error path

2014-07-01 10:15:34 +02:00

curl.c

block.curl: adding 'timeout' option

2014-08-29 10:46:57 +01:00

dmg.c

dmg: Handle failure for potentially large allocations

2014-08-15 15:07:15 +02:00

gluster.c

block: Use g_new() & friends where that makes obvious sense

2014-08-20 11:51:28 +02:00

iscsi.c

block/iscsi: fix memory corruption on iscsi resize

2014-08-22 10:55:22 +02:00

linux-aio.c

linux-aio: avoid deadlock in nested aio_poll() calls

2014-08-29 15:59:17 +01:00

Makefile.objs

aio-win32: add support for sockets

2014-08-29 10:46:58 +01:00

mirror.c

mirror: fix uninitialized variable delay_ns warnings

2014-08-28 13:42:25 +01:00

nbd-client.c

nbd: implement .bdrv_detach/attach_aio_context()

2014-06-04 09:56:11 +02:00

nbd-client.h

nbd: implement .bdrv_detach/attach_aio_context()

2014-06-04 09:56:11 +02:00

nbd.c

nbd: Implement bdrv_refresh_filename()

2014-08-20 14:31:56 +02:00

nfs.c

block: Use g_new() & friends where that makes obvious sense

2014-08-20 11:51:28 +02:00

parallels.c

block: Use g_new() & friends to avoid multiplying sizes

2014-08-20 11:51:28 +02:00

qapi.c

qemu-img info: show nocow info

2014-08-15 15:07:14 +02:00

qcow2-cache.c

qcow2: Use g_try_new0() for cache array

2014-08-20 11:51:28 +02:00

qcow2-cluster.c

block: Use g_new() & friends where that makes obvious sense

2014-08-20 11:51:28 +02:00

qcow2-refcount.c

block: Use g_new() & friends where that makes obvious sense

2014-08-20 11:51:28 +02:00

qcow2-snapshot.c

block: Use g_new() & friends where that makes obvious sense

2014-08-20 11:51:28 +02:00

qcow2.c

qcow2: Add runtime options for cache sizes

2014-08-20 11:51:28 +02:00

qcow2.h

qcow2: Add runtime options for cache sizes

2014-08-20 11:51:28 +02:00

qcow.c

block: Use g_new() & friends where that makes obvious sense

2014-08-20 11:51:28 +02:00

qed-check.c

block: Use g_new() & friends to avoid multiplying sizes

2014-08-20 11:51:28 +02:00

qed-cluster.c

…

qed-gencb.c

…

qed-l2-cache.c

…

qed-table.c

qed: use BlockDriverState's AioContext

2014-06-04 09:56:11 +02:00

qed.c

qed: Handle failure for potentially large allocations

2014-08-15 15:07:15 +02:00

qed.h

qed: Make qiov match request size until backing file EOF

2014-07-14 12:03:20 +02:00

quorum.c

block/quorum: add simple read pattern support

2014-08-29 10:46:58 +01:00

raw_bsd.c

block: Add Error argument to bdrv_refresh_limits()

2014-07-18 13:18:43 +01:00

raw-aio.h

linux-aio: implement io plug, unplug and flush io queue

2014-07-07 11:05:17 +02:00

raw-posix.c

raw-posix: fix O_DIRECT short reads

2014-08-22 11:00:56 +02:00

raw-win32.c

cleanup QEMUOptionParameter

2014-06-16 17:23:21 +08:00

rbd.c

block: Use g_new() & friends to avoid multiplying sizes

2014-08-20 11:51:28 +02:00

sheepdog.c

sheepdog: fix a core dump while do auto-reconnecting

2014-08-29 10:46:58 +01:00

snapshot.c

Use error_is_set() only when necessary

2014-02-17 11:57:23 -05:00

ssh.c

cleanup QEMUOptionParameter

2014-06-16 17:23:21 +08:00

stream.c

block: Add Error argument to bdrv_refresh_limits()

2014-07-18 13:18:43 +01:00

vdi.c

block: Use g_new() & friends where that makes obvious sense

2014-08-20 11:51:28 +02:00

vhdx-endian.c

block: VHDX endian fixes

2014-08-15 15:07:14 +02:00

vhdx-log.c

block: Drop some superfluous casts from void *

2014-08-20 11:51:28 +02:00

vhdx.c

block: Use g_new() & friends where that makes obvious sense

2014-08-20 11:51:28 +02:00

vhdx.h

block: VHDX endian fixes

2014-08-15 15:07:14 +02:00

vmdk.c

vmdk: Use bdrv_nb_sectors() where sectors, not bytes are wanted

2014-08-22 11:10:12 +02:00

vpc.c

vpc: Handle failure for potentially large allocations

2014-08-15 15:07:16 +02:00

vvfat.c

block/vvfat.c: remove debugging code to reinit stderr if NULL

2014-08-21 10:36:29 +02:00

win32-aio.c

raw-win32: Handle failure for potentially large allocations

2014-08-15 15:07:16 +02:00