Xen XL blocked on linux-image-4.3.0.1-amd64 4.3.3-5

From	"Torben Schou Jensen" <tsj@swampthing.dk>
Newsgroups	linux.debian.kernel
Subject	Xen XL blocked on linux-image-4.3.0.1-amd64 4.3.3-5
Date	2016-01-25 11:00 +0100
Message-ID	<qUM6f-20J-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Something with Xen is unstable since upgrade to kernel 4.3.0.1.

After 24 hours since last boot I suddenly on Dom0 get:

Jan 25 09:37:01 debian CRON[20287]: (root) CMD (if test -x
/usr/sbin/apticron; then /usr/sbin/apticron --cron; else true; fi) Jan 25
09:37:52 debian kernel: [85204.136136] INFO: task xl:19753 blocked for
more than 120 seconds.
Jan 25 09:37:52 debian kernel: [85204.136179]       Not tainted
4.3.0-1-amd64 #1
Jan 25 09:37:52 debian kernel: [85204.136202] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jan 25 09:37:52 debian kernel: [85204.136240] xl              D
ffff88018f4ca0c0     0 19753  19749 0x00000000
Jan 25 09:37:52 debian kernel: [85204.136245]  ffff8802080525c0
0000000000000286 ffff880179aca0c0 ffff8800744b0000
Jan 25 09:37:52 debian kernel: [85204.136249]  ffff8800744afe00
ffffffff81d09114 ffff8802080525c0 00000000ffffffff
Jan 25 09:37:52 debian kernel: [85204.136252]  ffffffff81d09118
ffffffff8158113f ffffffff81d09110 ffffffff815813ca
Jan 25 09:37:52 debian kernel: [85204.136255] Call Trace:
Jan 25 09:37:52 debian kernel: [85204.136265]  [] ? schedule+0x2f/0x70 Jan
25 09:37:52 debian kernel: [85204.136268]  [] ?
schedule_preempt_disabled+0xa/0x10
Jan 25 09:37:52 debian kernel: [85204.136271]  [] ?
__mutex_lock_slowpath+0xb4/0x120
Jan 25 09:37:52 debian kernel: [85204.136274]  [] ? mutex_lock+0x1b/0x30
Jan 25 09:37:52 debian kernel: [85204.136280]  [] ?
xenbus_dev_request_and_reply+0x21/0x90
Jan 25 09:37:52 debian kernel: [85204.136284]  [] ?
xenbus_file_write+0x292/0x520
Jan 25 09:37:52 debian kernel: [85204.136289]  [] ?
__raw_callee_save___pv_queued_spin_unlock+0x11/0x20
Jan 25 09:37:52 debian kernel: [85204.136293]  [] ? vfs_write+0xa1/0x190
Jan 25 09:37:52 debian kernel: [85204.136296]  [] ? SyS_write+0x52/0xc0
Jan 25 09:37:52 debian kernel: [85204.136300]  [] ?
system_call_fast_compare_end+0xc/0x67

After this XL stack is unuseable until next reboot.
All DomU guests continue to run fine.

I have a cron task making "xentop -b -i 1" every 5 min.
Stopping this remove above Call Trace messages, but XL still unuseable
until reboot.

Brgds
Torben Schou Jensen

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Thread

Xen XL blocked on linux-image-4.3.0.1-amd64 4.3.3-5 "Torben Schou Jensen" <tsj@swampthing.dk> - 2016-01-25 11:00 +0100
  Re: Xen XL blocked on linux-image-4.3.0.1-amd64 4.3.3-5 Ian Campbell <ijc@debian.org> - 2016-01-25 11:50 +0100

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