From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 191451] Host hangs when hyperv/pvspinlock are disabled
Date: Thu, 23 Feb 2017 22:42:18 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=191451
--- Comment #2 from uzytkownik2@gmail.com (uzytkownik2@gmail.com) ---
Debugging unrelated issue I noticed that many processes are in uninterruptable
sleep:
# ps aux | awk '$8 ~ /D/{print $0}'
root 742 0.0 0.0 0 0 ? D Feb20 0:00
[kworker/5:255]
root 913 0.0 0.0 0 0 ? D Feb20 0:15
[kworker/3:173]
root 4875 0.0 0.0 0 0 ? Ds Feb21 0:00
[systemd-logind]
root 4890 0.0 0.0 0 0 ? D Feb21 0:00
[kworker/u24:3]
root 5048 0.0 0.0 0 0 ? D Feb21 0:00 [kworker/6:1]
root 5238 0.0 0.0 62512 3376 ? DNs Feb21 0:00 (coredump)
root 5593 0.0 0.0 62512 3376 ? DNs Feb22 0:00 (coredump)
root 5715 0.0 0.0 62512 3376 ? DNs Feb22 0:00 (coredump)
root 24545 0.0 0.0 0 0 ? DN Feb22 0:00 [scanelf]
root 24556 0.0 0.0 62512 3504 ? DNs Feb22 0:00 (coredump)
root 27852 0.0 0.0 0 0 ? D Feb20 0:02 [kworker/9:4]
root 32672 0.0 0.0 0 0 ? D Feb20 0:20
[kworker/7:232]
# uptime
14:40:15 up 7 days, 15:26, 2 users, load average: 0.00, 0.00, 0.00
The VFIO might be a missed hint which just makes it appear quicker.
In kernel log I have messages such as:
[660318.170055] rcu_sched kthread starved for 6305 jiffies! g933470 c933469
f0x0 RCU_GP_WAIT_FQS(3) ->state=0x1
[660318.170055] rcu_sched S14864 7 2 0x00000000
[660318.170055] ffff970f5bf43500 ffff970f5f5162c0 ffff970b17a16cc0
ffff970f5bef4f80
[660318.170055] ffff970f5f5162c0 ffffa66283197d88 ffffffffa1e673d8
ffffa66283197dd0
[660318.170055] 000000005f50eb00 0000000000000286 ffff970f5bef4f80
ffffa66283197dd0
[660318.170055] Call Trace:
[660318.170055] [] ? __schedule+0x1f8/0x650
[660318.170055] [] schedule+0x31/0x80
[660318.170055] [] schedule_timeout+0x155/0x2f0
[660318.170055] [] ? rcu_report_qs_rnp+0xed/0x180
[660318.170055] [] ? del_timer_sync+0x50/0x50
[660318.170055] [] ? prepare_to_swait+0x5c/0x90
[660318.170055] [] rcu_gp_kthread+0x473/0x7f0
[660318.170055] [] ? call_rcu_sched+0x20/0x20
[660318.170055] [] kthread+0xc5/0xe0
[660318.170055] [] ? kthread_park+0x60/0x60
[660318.170055] [] ret_from_fork+0x22/0x30
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