From: Thomas Huth <1923583@bugs.launchpad.net>
To: qemu-devel@nongnu.org
Subject: [Bug 1923583] Re: colo: pvm flush failed after svm killed
Date: Sat, 15 May 2021 10:23:06 -0000 [thread overview]
Message-ID: <162107418648.20814.16895064246248620407.malone@soybean.canonical.com> (raw)
In-Reply-To: 161830261172.29345.7866671962411605196.malonedeb@wampee.canonical.com
The QEMU project is currently moving its bug tracking to another system.
For this we need to know which bugs are still valid and which could be
closed already. Thus we are setting the bug state to "Incomplete" now.
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Thank you and sorry for the inconvenience.
** 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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next prev parent reply other threads:[~2021-05-15 10:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-13 8:30 [Bug 1923583] [NEW] colo: pvm flush failed after svm killed meeho yuen
2021-04-13 8:45 ` no-reply
2021-05-15 10:23 ` Thomas Huth [this message]
2021-06-16 11:15 ` [Bug 1923583] " meeho yuen
2021-08-25 7:18 ` Thomas Huth
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