linux-kernel - Linux 4.9-rcX: rcu_preempt detected stalls on CPUs/tasks messages

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Date:   Sat, 5 Nov 2016 23:38:50 +0100
From:   Gabriel C <nix.or.die@...il.com>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     tglx@...utronix.de, mingo@...nel.org
Subject: Linux 4.9-rcX: rcu_preempt detected stalls on CPUs/tasks messages

Hello ,


I've tested 4.9-rcX and Linus git tree and have on this box the following messages :

.....

Nov 05 20:26:40 zwerg kernel: INFO: rcu_preempt detected stalls on CPUs/tasks:
Nov 05 20:26:40 zwerg kernel:         Tasks blocked on level-0 rcu_node (CPUs 0-15): P0
Nov 05 20:26:40 zwerg kernel:         (detected by 8, t=60002 jiffies, g=2426, c=2425, q=789)
Nov 05 20:26:40 zwerg kernel: swapper/0       R  running task        0     0      0 0x00200000
Nov 05 20:26:40 zwerg kernel:  0000000000000000 ffff88043fc0c6c0 ffffffff810ca25e 0000000000000004
Nov 05 20:26:40 zwerg kernel:  0000000000000002 0000000000000003 0000000000000010 ffffffff814b936f
Nov 05 20:26:40 zwerg kernel:  ffff88043fc1d600 ffffffff81893f00 0000000000000003 ffffffff81893de0
Nov 05 20:26:40 zwerg kernel: Call Trace:
Nov 05 20:26:40 zwerg kernel:  [<ffffffff810ca25e>] ? __tick_broadcast_oneshot_control+0x5e/0x220
Nov 05 20:26:40 zwerg kernel:  [<ffffffff814b936f>] ? intel_idle+0xef/0xfe
Nov 05 20:26:40 zwerg kernel:  [<ffffffff813d3b45>] ? cpuidle_enter_state+0x125/0x200
Nov 05 20:26:40 zwerg kernel:  [<ffffffff81096e0f>] ? cpu_startup_entry+0x13f/0x230
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e9e69>] ? start_kernel+0x428/0x430
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e9120>] ? early_idt_handler_array+0x120/0x120
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e937a>] ? x86_64_start_kernel+0xef/0xfe
Nov 05 20:26:40 zwerg kernel: swapper/0       R  running task        0     0      0 0x00200000
Nov 05 20:26:40 zwerg kernel:  0000000000000000 ffff88043fc0c6c0 ffffffff810ca25e 0000000000000004
Nov 05 20:26:40 zwerg kernel:  0000000000000002 0000000000000003 0000000000000010 ffffffff814b936f
Nov 05 20:26:40 zwerg kernel:  ffff88043fc1d600 ffffffff81893f00 0000000000000003 ffffffff81893de0
Nov 05 20:26:40 zwerg kernel: Call Trace:
Nov 05 20:26:40 zwerg kernel:  [<ffffffff810ca25e>] ? __tick_broadcast_oneshot_control+0x5e/0x220
Nov 05 20:26:40 zwerg kernel:  [<ffffffff814b936f>] ? intel_idle+0xef/0xfe
Nov 05 20:26:40 zwerg kernel:  [<ffffffff813d3b45>] ? cpuidle_enter_state+0x125/0x200
Nov 05 20:26:40 zwerg kernel:  [<ffffffff81096e0f>] ? cpu_startup_entry+0x13f/0x230
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e9e69>] ? start_kernel+0x428/0x430
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e9120>] ? early_idt_handler_array+0x120/0x120
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e937a>] ? x86_64_start_kernel+0xef/0xfe

.....

When I boot to console mode the system seems to work at least when I'm loggen in from tty1.
Switching to other tty's sometimes works sometimes not.. Starting X makes the box hang.. sddm starts but I
never get to the logn screen. After some minutes I have to hard reset the box..

Latest tested git kernel is 4.9.0-rc3-00429-g03daa36 , the box is a FUJITSU PRIMERGY TX200 S5.

config used and dmesg can be found there :

http://ftp.frugalware.org/pub/other/people/crazy/kernel/

Best Regards

Gabriel C