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qemu-kvm/kvm-block-backup-top-Don-t-acquire-context-while-droppin.patch
Danilo C. L. de Paula fda7fbcd8d * Fri Feb 14 2020 Danilo Cesar Lemes de Paula <ddepaula@redhat.com> - 4.2.0-10.el8 
- kvm-i386-Resolve-CPU-models-to-v1-by-default.patch [bz#1779078 bz#1787291 bz#1779078 bz#1779078]
- kvm-iotests-Support-job-complete-in-run_job.patch [bz#1781637]
- kvm-iotests-Create-VM.blockdev_create.patch [bz#1781637]
- kvm-block-Activate-recursively-even-for-already-active-n.patch [bz#1781637]
- kvm-hmp-Allow-using-qdev-ID-for-qemu-io-command.patch [bz#1781637]
- kvm-iotests-Test-external-snapshot-with-VM-state.patch [bz#1781637]
- kvm-iotests.py-Let-wait_migration-wait-even-more.patch [bz#1781637]
- kvm-blockdev-fix-coding-style-issues-in-drive_backup_pre.patch [bz#1745606 bz#1746217 bz#1773517 bz#1779036 bz#1782111 bz#1782175 bz#1783965]
- kvm-blockdev-unify-qmp_drive_backup-and-drive-backup-tra.patch [bz#1745606 bz#1746217 bz#1773517 bz#1779036 bz#1782111 bz#1782175 bz#1783965]
- kvm-blockdev-unify-qmp_blockdev_backup-and-blockdev-back.patch [bz#1745606 bz#1746217 bz#1773517 bz#1779036 bz#1782111 bz#1782175 bz#1783965]
- kvm-blockdev-honor-bdrv_try_set_aio_context-context-requ.patch [bz#1745606 bz#1746217 bz#1773517 bz#1779036 bz#1782111 bz#1782175 bz#1783965]
- kvm-backup-top-Begin-drain-earlier.patch [bz#1745606 bz#1746217 bz#1773517 bz#1779036 bz#1782111 bz#1782175 bz#1783965]
- kvm-block-backup-top-Don-t-acquire-context-while-droppin.patch [bz#1745606 bz#1746217 bz#1773517 bz#1779036 bz#1782111 bz#1782175 bz#1783965]
- kvm-blockdev-Acquire-AioContext-on-dirty-bitmap-function.patch [bz#1745606 bz#1746217 bz#1773517 bz#1779036 bz#1782111 bz#1782175 bz#1783965]
- kvm-blockdev-Return-bs-to-the-proper-context-on-snapshot.patch [bz#1745606 bz#1746217 bz#1773517 bz#1779036 bz#1782111 bz#1782175 bz#1783965]
- kvm-iotests-Test-handling-of-AioContexts-with-some-block.patch [bz#1745606 bz#1746217 bz#1773517 bz#1779036 bz#1782111 bz#1782175 bz#1783965]
- kvm-target-arm-monitor-query-cpu-model-expansion-crashed.patch [bz#1801320]
- kvm-docs-arm-cpu-features-Make-kvm-no-adjvtime-comment-c.patch [bz#1801320]
- Resolves: bz#1745606
  (Qemu hang when do incremental live backup in transaction mode without bitmap)
- Resolves: bz#1746217
  (Src qemu hang when do storage vm migration during guest installation)
- Resolves: bz#1773517
  (Src qemu hang when do storage vm migration with dataplane enable)
- Resolves: bz#1779036
  (Qemu coredump when do snapshot in transaction mode with one snapshot path not exist)
- Resolves: bz#1779078
  (RHVH 4.4: Failed to run VM on 4.3/4.4 engine (Exit message: the CPU is incompatible with host CPU: Host CPU does not provide required features: hle, rtm))
- Resolves: bz#1781637
  (qemu crashed when do mem and disk snapshot)
- Resolves: bz#1782111
  (Qemu hang when do full backup on multi-disks with one job's 'job-id' missed in transaction mode(data plane enable))
- Resolves: bz#1782175
  (Qemu core dump when add persistent bitmap(data plane enable))
- Resolves: bz#1783965
  (Qemu core dump when do backup with sync: bitmap and no bitmap provided)
- Resolves: bz#1787291
  (RHVH 4.4: Failed to run VM on 4.3/4.4 engine (Exit message: the CPU is incompatible with host CPU: Host CPU does not provide required features: hle, rtm) [rhel-8.1.0.z])
- Resolves: bz#1801320
  (aarch64: backport query-cpu-model-expansion and adjvtime document fixes)
2020-02-14 03:03:11 +00:00

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From aefff389c4d11bd69180db7177135c4645a9b1bd Mon Sep 17 00:00:00 2001
From: Sergio Lopez Pascual <slp@redhat.com>
Date: Fri, 7 Feb 2020 11:27:46 +0000
Subject: [PATCH 13/18] block/backup-top: Don't acquire context while dropping
top
RH-Author: Sergio Lopez Pascual <slp@redhat.com>
Message-id: <20200207112749.25073-7-slp@redhat.com>
Patchwork-id: 93759
O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH v2 6/9] block/backup-top: Don't acquire context while dropping top
Bugzilla: 1745606 1746217 1773517 1779036 1782111 1782175 1783965
RH-Acked-by: Stefano Garzarella <sgarzare@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
All paths that lead to bdrv_backup_top_drop(), except for the call
from backup_clean(), imply that the BDS AioContext has already been
acquired, so doing it there too can potentially lead to QEMU hanging
on AIO_WAIT_WHILE().
An easy way to trigger this situation is by issuing a two actions
transaction, with a proper and a bogus blockdev-backup, so the second
one will trigger a rollback. This will trigger a hang with an stack
trace like this one:
#0 0x00007fb680c75016 in __GI_ppoll (fds=0x55e74580f7c0, nfds=1, timeout=<optimized out>,
timeout@entry=0x0, sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1 0x000055e743386e09 in ppoll (__ss=0x0, __timeout=0x0, __nfds=<optimized out>, __fds=<optimized out>)
at /usr/include/bits/poll2.h:77
#2 0x000055e743386e09 in qemu_poll_ns
(fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at util/qemu-timer.c:336
#3 0x000055e743388dc4 in aio_poll (ctx=0x55e7458925d0, blocking=blocking@entry=true)
at util/aio-posix.c:669
#4 0x000055e743305dea in bdrv_flush (bs=bs@entry=0x55e74593c0d0) at block/io.c:2878
#5 0x000055e7432be58e in bdrv_close (bs=0x55e74593c0d0) at block.c:4017
#6 0x000055e7432be58e in bdrv_delete (bs=<optimized out>) at block.c:4262
#7 0x000055e7432be58e in bdrv_unref (bs=bs@entry=0x55e74593c0d0) at block.c:5644
#8 0x000055e743316b9b in bdrv_backup_top_drop (bs=bs@entry=0x55e74593c0d0) at block/backup-top.c:273
#9 0x000055e74331461f in backup_job_create
(job_id=0x0, bs=bs@entry=0x55e7458d5820, target=target@entry=0x55e74589f640, speed=0, sync_mode=MIRROR_SYNC_MODE_FULL, sync_bitmap=sync_bitmap@entry=0x0, bitmap_mode=BITMAP_SYNC_MODE_ON_SUCCESS, compress=false, filter_node_name=0x0, on_source_error=BLOCKDEV_ON_ERROR_REPORT, on_target_error=BLOCKDEV_ON_ERROR_REPORT, creation_flags=0, cb=0x0, opaque=0x0, txn=0x0, errp=0x7ffddfd1efb0) at block/backup.c:478
#10 0x000055e74315bc52 in do_backup_common
(backup=backup@entry=0x55e746c066d0, bs=bs@entry=0x55e7458d5820, target_bs=target_bs@entry=0x55e74589f640, aio_context=aio_context@entry=0x55e7458a91e0, txn=txn@entry=0x0, errp=errp@entry=0x7ffddfd1efb0)
at blockdev.c:3580
#11 0x000055e74315c37c in do_blockdev_backup
(backup=backup@entry=0x55e746c066d0, txn=0x0, errp=errp@entry=0x7ffddfd1efb0)
at /usr/src/debug/qemu-kvm-4.2.0-2.module+el8.2.0+5135+ed3b2489.x86_64/./qapi/qapi-types-block-core.h:1492
#12 0x000055e74315c449 in blockdev_backup_prepare (common=0x55e746a8de90, errp=0x7ffddfd1f018)
at blockdev.c:1885
#13 0x000055e743160152 in qmp_transaction
(dev_list=<optimized out>, has_props=<optimized out>, props=0x55e7467fe2c0, errp=errp@entry=0x7ffddfd1f088) at blockdev.c:2340
#14 0x000055e743287ff5 in qmp_marshal_transaction
(args=<optimized out>, ret=<optimized out>, errp=0x7ffddfd1f0f8)
at qapi/qapi-commands-transaction.c:44
#15 0x000055e74333de6c in do_qmp_dispatch
(errp=0x7ffddfd1f0f0, allow_oob=<optimized out>, request=<optimized out>, cmds=0x55e743c28d60 <qmp_commands>) at qapi/qmp-dispatch.c:132
#16 0x000055e74333de6c in qmp_dispatch
(cmds=0x55e743c28d60 <qmp_commands>, request=<optimized out>, allow_oob=<optimized out>)
at qapi/qmp-dispatch.c:175
#17 0x000055e74325c061 in monitor_qmp_dispatch (mon=0x55e745908030, req=<optimized out>)
at monitor/qmp.c:145
#18 0x000055e74325c6fa in monitor_qmp_bh_dispatcher (data=<optimized out>) at monitor/qmp.c:234
#19 0x000055e743385866 in aio_bh_call (bh=0x55e745807ae0) at util/async.c:117
#20 0x000055e743385866 in aio_bh_poll (ctx=ctx@entry=0x55e7458067a0) at util/async.c:117
#21 0x000055e743388c54 in aio_dispatch (ctx=0x55e7458067a0) at util/aio-posix.c:459
#22 0x000055e743385742 in aio_ctx_dispatch
(source=<optimized out>, callback=<optimized out>, user_data=<optimized out>) at util/async.c:260
#23 0x00007fb68543e67d in g_main_dispatch (context=0x55e745893a40) at gmain.c:3176
#24 0x00007fb68543e67d in g_main_context_dispatch (context=context@entry=0x55e745893a40) at gmain.c:3829
#25 0x000055e743387d08 in glib_pollfds_poll () at util/main-loop.c:219
#26 0x000055e743387d08 in os_host_main_loop_wait (timeout=<optimized out>) at util/main-loop.c:242
#27 0x000055e743387d08 in main_loop_wait (nonblocking=<optimized out>) at util/main-loop.c:518
#28 0x000055e74316a3c1 in main_loop () at vl.c:1828
#29 0x000055e743016a72 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>)
at vl.c:4504
Fix this by not acquiring the AioContext there, and ensuring all paths
leading to it have it already acquired (backup_clean()).
RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1782111
Signed-off-by: Sergio Lopez <slp@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 0abf2581717a19d9749d5c2ff8acd0ac203452c2)
Signed-off-by: Sergio Lopez <slp@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
block/backup-top.c | 5 -----
block/backup.c | 3 +++
2 files changed, 3 insertions(+), 5 deletions(-)
diff --git a/block/backup-top.c b/block/backup-top.c
index 818d3f2..b8d863f 100644
--- a/block/backup-top.c
+++ b/block/backup-top.c
@@ -255,9 +255,6 @@ append_failed:
void bdrv_backup_top_drop(BlockDriverState *bs)
{
BDRVBackupTopState *s = bs->opaque;
- AioContext *aio_context = bdrv_get_aio_context(bs);
-
- aio_context_acquire(aio_context);
bdrv_drained_begin(bs);
@@ -271,6 +268,4 @@ void bdrv_backup_top_drop(BlockDriverState *bs)
bdrv_drained_end(bs);
bdrv_unref(bs);
-
- aio_context_release(aio_context);
}
diff --git a/block/backup.c b/block/backup.c
index cf62b1a..1383e21 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -135,8 +135,11 @@ static void backup_abort(Job *job)
static void backup_clean(Job *job)
{
BackupBlockJob *s = container_of(job, BackupBlockJob, common.job);
+ AioContext *aio_context = bdrv_get_aio_context(s->backup_top);
+ aio_context_acquire(aio_context);
bdrv_backup_top_drop(s->backup_top);
+ aio_context_release(aio_context);
}
void backup_do_checkpoint(BlockJob *job, Error **errp)
--
1.8.3.1
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