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