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[Bug 1923583] Re: colo: pvm flush failed after svm killed
From: |
Thomas Huth |
Subject: |
[Bug 1923583] Re: colo: pvm flush failed after svm killed |
Date: |
Sat, 15 May 2021 10:23:06 -0000 |
The QEMU project is currently moving its bug tracking to another system.
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** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1923583
Title:
colo: pvm flush failed after svm killed
Status in QEMU:
Incomplete
Bug description:
Hi,
Primary vm flush failed after killing svm, which leads primary vm guest
filesystem unavailable.
qemu versoin: 5.2.0
host/guest os: CentOS Linux release 7.6.1810 (Core)
Reproduce steps:
1. create colo vm following
https://github.com/qemu/qemu/blob/master/docs/COLO-FT.txt
2. kill secondary vm (don't remove nbd child from quorum on primary vm)and
wait for a minute. the interval depends on guest os.
result: primary vm file system shutdown because of flush cache error.
After serveral tests, I found that qemu-5.0.0 worked well, and it's
the commit
https://git.qemu.org/?p=qemu.git;a=commit;h=883833e29cb800b4d92b5d4736252f4004885191(block:
Flush all children in generic code) leads this change, and both
virtio-blk and ide turned out to be bad.
I think it's nbd(replication) flush failed leads bdrv_co_flush(quorum_bs)
failed, here is the call stack.
#0 bdrv_co_flush (bs=0x56242b3cc0b0=nbd_bs) at ../block/io.c:2856
#1 0x0000562428b0f399 in bdrv_co_flush (bs=0x56242b3c7e00=replication_bs) at
../block/io.c:2920
#2 0x0000562428b0f399 in bdrv_co_flush (bs=0x56242a4ad800=quorum_bs) at
../block/io.c:2920
#3 0x0000562428b70d56 in blk_do_flush (blk=0x56242a4ad4a0) at
../block/block-backend.c:1672
#4 0x0000562428b70d87 in blk_aio_flush_entry (opaque=0x7fd0980073f0) at
../block/block-backend.c:1680
#5 0x0000562428c5f9a7 in coroutine_trampoline (i0=-1409269904, i1=32721) at
../util/coroutine-ucontext.c:173
While i am not sure whether i use colo inproperly? Can we assume that
nbd child of quorum immediately removed right after svm crashed? Or
it's really a bug? Does the following patch fix? Help is needed!
Thanks a lot!
diff --git a/block/quorum.c b/block/quorum.c
index cfc1436..f2c0805 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -1279,7 +1279,7 @@ static BlockDriver bdrv_quorum = {
.bdrv_dirname = quorum_dirname,
.bdrv_co_block_status = quorum_co_block_status,
- .bdrv_co_flush_to_disk = quorum_co_flush,
+ .bdrv_co_flush = quorum_co_flush,
.bdrv_getlength = quorum_getlength,
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