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From: Stefan Hajnoczi <stefanha@redhat.com>
To: Zhenyu Ye <yezhenyu2@huawei.com>
Cc: Kevin Wolf <kwolf@redhat.com>,
	fam@euphon.net, qemu-block@nongnu.org, armbru@redhat.com,
	xiexiangyou@huawei.com, qemu-devel@nongnu.org,
	pbonzini@redhat.com, mreitz@redhat.com
Subject: Re: [PATCH v1 0/2] Add timeout mechanism to qmp actions
Date: Thu, 17 Sep 2020 16:44:15 +0100	[thread overview]
Message-ID: <20200917154415.GB839531@stefanha-x1.localdomain> (raw)
In-Reply-To: <7ad220bd-7ee5-1f66-b2e5-7dc57d72eb2e@huawei.com>

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On Thu, Sep 17, 2020 at 03:36:57PM +0800, Zhenyu Ye wrote:
> When the hang occurs, the QEMU is blocked at:
> 
> 	#0  0x0000ffff95762b64 in ?? () from target:/usr/lib64/libpthread.so.0
> 	#1  0x0000ffff9575bd88 in pthread_mutex_lock () from target:/usr/lib64/libpthread.so.0
> 	#2  0x0000aaaabb1f5948 in qemu_mutex_lock_impl (mutex=0xaaaacc8e1860,
> 	    file=0xaaaabb4e1bd0 "/Images/eillon/CODE/5-opensource/qemu/util/async.c", line=605)
> 	#3  0x0000aaaabb20acd4 in aio_context_acquire (ctx=0xaaaacc8e1800)
> 	#4  0x0000aaaabb105e90 in bdrv_query_image_info (bs=0xaaaacc934620,
> 	    p_info=0xaaaaccc41e18, errp=0xffffca669118)
> 	#5  0x0000aaaabb105968 in bdrv_block_device_info (blk=0xaaaacdca19f0, bs=0xaaaacc934620,
> 	    flat=false, errp=0xffffca6692b8)
> 	#6  0x0000aaaabb1063dc in bdrv_query_info (blk=0xaaaacdca19f0, p_info=0xaaaacd29c9a8,
> 	    errp=0xffffca6692b8)
> 	#7  0x0000aaaabb106c14 in qmp_query_block (errp=0x0)
> 	#8  0x0000aaaabacb8e6c in hmp_info_block (mon=0xffffca6693d0, qdict=0xaaaacd089790)

Great, this shows that the main loop thread is stuck waiting for the
AioContext lock.

Please post backtraces from all QEMU threads ((gdb) thread apply all bt)
so we can figure out which thread is holding up the main loop.

Thanks,
Stefan

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  parent reply	other threads:[~2020-09-17 15:51 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-10 14:52 [PATCH v1 0/2] Add timeout mechanism to qmp actions Zhenyu Ye
2020-08-10 14:52 ` [PATCH v1 1/2] util: introduce aio_context_acquire_timeout Zhenyu Ye
2020-08-10 14:52 ` [PATCH v1 2/2] qmp: use aio_context_acquire_timeout replace aio_context_acquire Zhenyu Ye
2020-08-10 15:38 ` [PATCH v1 0/2] Add timeout mechanism to qmp actions Kevin Wolf
2020-08-11 13:54   ` Zhenyu Ye
2020-08-21 12:52     ` Stefan Hajnoczi
2020-09-14 13:27     ` Stefan Hajnoczi
2020-09-17  7:36       ` Zhenyu Ye
2020-09-17 10:10         ` Fam Zheng
2020-09-17 15:44         ` Stefan Hajnoczi [this message]
2020-09-17 16:01           ` Fam Zheng
2020-09-18 11:23             ` Zhenyu Ye
2020-09-18 14:06               ` Fam Zheng
2020-09-19  2:22                 ` Zhenyu Ye
2020-09-21 11:14                   ` Fam Zheng
2020-10-13 10:00                     ` Stefan Hajnoczi
2020-10-19 12:40                       ` Zhenyu Ye
2020-10-19 13:25                         ` Paolo Bonzini
2020-10-20  1:34                           ` Zhenyu Ye
2020-10-22 16:29                             ` Fam Zheng
2020-12-08 13:10                               ` Stefan Hajnoczi
2020-12-08 13:47                                 ` Glauber Costa
2020-12-14 16:33                                   ` Stefan Hajnoczi
2020-12-21 11:30                                     ` Zhenyu Ye
2020-09-14 14:42     ` Daniel P. Berrangé
2020-09-17  8:12       ` Zhenyu Ye
2020-08-12 13:51 ` Stefan Hajnoczi
2020-08-13  1:51   ` Zhenyu Ye

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