Re: [libvirt] hash: failed on concurrent iterating.

4 Apr 2018


      On 04/04/2018 11:50 AM, Zhangzijian wrote:
...
...
-----Original Message-----
From: libvir-list-bounces@redhat.com [mailto:libvir-list-bounces@redhat.com]
On Behalf Of Michal Privoznik
Sent: Wednesday, April 04, 2018 5:21 PM
To: zhangzijian (Cloud); libvir-list@redhat.com
Cc: huangyong (Cloud)
Subject: Re: [libvirt] hash: failed on concurrent iterating.
On 04/04/2018 11:10 AM, Zhangzijian wrote:
...
In function 'virHashForEach/virHashSearch', 'table->iterating' prevent
concurrent iterating. But most caller evoke it, after hold a read lock.
This will lead the second caller failed to iterate the table. So, the caller should
hold a write lock, then iterate the table.
Looks like there's another thread discussing this issue:
Yes, the issue is still exist in v4.2.0.
Is it applicable to using write lock instead?
Do you have a stack trace to share?

Michal