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Date: Sun, 15 May 2016 21:35:40 -0700
From: "santosh.shilimkar@...cle.com" <santosh.shilimkar@...cle.com>
To: paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Cc: Sasha Levin <sasha.levin@...cle.com>
Subject: Re: [rcu_sched stall] regression/miss-config ?
On 5/15/16 2:18 PM, Santosh Shilimkar wrote:
> Hi Paul,
>
> I was asking Sasha about [1] since other folks in Oracle
> also stumbled upon similar RCU stalls with v4.1 kernel in
> different workloads. I was reported similar issue with
> RDS as well and looking at [1], [2], [3] and [4], thought
> of reaching out to see if you can help us to understand
> this issue better.
>
> Have also included RCU specific config used in these
> test(s). Its very hard to reproduce the issue but one of
> the data point is, it reproduces on systems with larger
> CPUs(64+). Same workload with less than 64 CPUs, don't
> show the issue. Someone also told me, making use of
> SLAB instead SLUB allocator makes difference but I
> haven't verified that part for RDS.
>
> Let me know your thoughts. Thanks in advance !!
>
One of my colleague told me the pastebin server I used
is Oracle internal only so adding the relevant logs along
with email.
Regards,
Santosh
>
> [1] https://lkml.org/lkml/2014/12/14/304
[2] Log 1 snippet:
-----------------------------------------------------------------
INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched self-detected stall on CPU { 54} (t=60000 jiffies
g=66023 c=66022 q=0)
Task dump for CPU 54:
ksoftirqd/54 R running task 0 389 2 0x00000008
0000000000000007 ffff88ff7f403d38 ffffffff810a8621 0000000000000036
ffffffff81ab6540 ffff88ff7f403d58 ffffffff810a86cf 0000000000000086
ffffffff81ab6940 ffff88ff7f403d88 ffffffff810e3ad3 ffffffff81ab6540
Call Trace:
<IRQ> [<ffffffff810a8621>] sched_show_task+0xb1/0x120
[<ffffffff810a86cf>] dump_cpu_task+0x3f/0x50
[<ffffffff810e3ad3>] rcu_dump_cpu_stacks+0x83/0xc0
[<ffffffff810e490c>] print_cpu_stall+0xfc/0x170
[<ffffffff810e5eeb>] __rcu_pending+0x2bb/0x2c0
[<ffffffff810e5f8d>] rcu_check_callbacks+0x9d/0x170
[<ffffffff810e9772>] update_process_times+0x42/0x70
[<ffffffff810fb589>] tick_sched_handle+0x39/0x80
[<ffffffff810fb824>] tick_sched_timer+0x44/0x80
[<ffffffff810ebc04>] __run_hrtimer+0x74/0x1d0
[<ffffffff810fb7e0>] ? tick_nohz_handler+0xa0/0xa0
[<ffffffff810ebf92>] hrtimer_interrupt+0x102/0x240
[<ffffffff810521f9>] local_apic_timer_interrupt+0x39/0x60
[<ffffffff816c47b5>] smp_apic_timer_interrupt+0x45/0x59
[<ffffffff816c263e>] apic_timer_interrupt+0x6e/0x80
<EOI> [<ffffffff8118db64>] ? free_one_page+0x164/0x380
[<ffffffff8118de43>] ? __free_pages_ok+0xc3/0xe0
[<ffffffff8118e775>] __free_pages+0x25/0x40
[<ffffffffa21054f0>] rds_message_purge+0x60/0x150 [rds]
[<ffffffffa2105624>] rds_message_put+0x44/0x80 [rds]
[<ffffffffa21535b4>] rds_ib_send_cqe_handler+0x134/0x2d0 [rds_rdma]
[<ffffffff816c102b>] ? _raw_spin_unlock_irqrestore+0x1b/0x50
[<ffffffffa18c0273>] ? mlx4_ib_poll_cq+0xb3/0x2a0 [mlx4_ib]
[<ffffffffa214c6f1>] poll_cq+0xa1/0xe0 [rds_rdma]
[<ffffffffa214d489>] rds_ib_tasklet_fn_send+0x79/0xf0 [rds_rdma]
[<ffffffff81084b31>] tasklet_action+0xb1/0xc0
[<ffffffff810854a2>] __do_softirq+0xf2/0x2f0
[<ffffffff810a4930>] ? smpboot_create_threads+0x80/0x80
[<ffffffff810856cd>] run_ksoftirqd+0x2d/0x50
[<ffffffff810a4a46>] smpboot_thread_fn+0x116/0x170
[<ffffffff810a11ae>] kthread+0xce/0xf0
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff816c1b62>] ret_from_fork+0x42/0x70
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
Task dump for CPU 66:
ksoftirqd/66 R running task 0 474 2 0x00000008
04208040664afe58 ffff88ff664ac008 000000010005d97a 0000000a39b2e200
0000000000000018 0000000000000006 ffff88ff664a1c00 ffff88ff669a5260
ffff88ff664a1c00 ffffffff81aa4ec0 ffffffff810a4930 0000000000000000
Call Trace:
[<ffffffff810a4930>] ? smpboot_create_threads+0x80/0x80
[<ffffffff810856cd>] ? run_ksoftirqd+0x2d/0x50
[<ffffffff810a4a46>] ? smpboot_thread_fn+0x116/0x170
[<ffffffff810a11ae>] ? kthread+0xce/0xf0
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff816c1b62>] ? ret_from_fork+0x42/0x70
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
{ 66} (t=60011 jiffies g=66023 c=66022 q=0)
Task dump for CPU 54:
ksoftirqd/54 R running task 0 389 2 0x00000008
04208040669e3e58 ffff88ff669e0008 000000010005d981 0000000a39b28e00
0000000000000000 0000000000000006 ffff88ff669d1c00 ffff88ff669a5020
ffff88ff669d1c00 ffffffff81aa4ec0 ffffffff810a4930 0000000000000000
Call Trace:
[<ffffffff810a4930>] ? smpboot_create_threads+0x80/0x80
[<ffffffff810856cd>] ? run_ksoftirqd+0x2d/0x50
[<ffffffff810a4a46>] ? smpboot_thread_fn+0x116/0x170
[<ffffffff810a11ae>] ? kthread+0xce/0xf0
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff816c1b62>] ? ret_from_fork+0x42/0x70
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
Task dump for CPU 66:
ksoftirqd/66 R running task 0 474 2 0x00000008
0000000000000003 ffff88ff7f703d38 ffffffff810a8621 0000000000000042
ffffffff81ab6540 ffff88ff7f703d58 ffffffff810a86cf 0000000000000086
ffffffff81ab6a40 ffff88ff7f703d88 ffffffff810e3ad3 ffffffff81ab6540
Call Trace:
<IRQ> [<ffffffff810a8621>] sched_show_task+0xb1/0x120
[<ffffffff810a86cf>] dump_cpu_task+0x3f/0x50
[<ffffffff810e3ad3>] rcu_dump_cpu_stacks+0x83/0xc0
[<ffffffff810e490c>] print_cpu_stall+0xfc/0x170
[<ffffffff810e5eeb>] __rcu_pending+0x2bb/0x2c0
[<ffffffff810e5f8d>] rcu_check_callbacks+0x9d/0x170
[<ffffffff810e9772>] update_process_times+0x42/0x70
[<ffffffff810fb589>] tick_sched_handle+0x39/0x80
[<ffffffff810fb824>] tick_sched_timer+0x44/0x80
[<ffffffff810ebc04>] __run_hrtimer+0x74/0x1d0
[<ffffffff810fb7e0>] ? tick_nohz_handler+0xa0/0xa0
[<ffffffff810ebf92>] hrtimer_interrupt+0x102/0x240
[<ffffffff810521f9>] local_apic_timer_interrupt+0x39/0x60
[<ffffffff816c47b5>] smp_apic_timer_interrupt+0x45/0x59
[<ffffffff816c263e>] apic_timer_interrupt+0x6e/0x80
<EOI> [<ffffffff8118db64>] ? free_one_page+0x164/0x380
[<ffffffff8118de43>] ? __free_pages_ok+0xc3/0xe0
[<ffffffff8118e775>] __free_pages+0x25/0x40
[<ffffffffa21054f0>] rds_message_purge+0x60/0x150 [rds]
[<ffffffffa2105624>] rds_message_put+0x44/0x80 [rds]
[<ffffffffa21535b4>] rds_ib_send_cqe_handler+0x134/0x2d0 [rds_rdma]
[<ffffffff816c102b>] ? _raw_spin_unlock_irqrestore+0x1b/0x50
[<ffffffffa18c0273>] ? mlx4_ib_poll_cq+0xb3/0x2a0 [mlx4_ib]
[<ffffffffa214c6f1>] poll_cq+0xa1/0xe0 [rds_rdma]
[<ffffffffa214d489>] rds_ib_tasklet_fn_send+0x79/0xf0 [rds_rdma]
[<ffffffff81084b31>] tasklet_action+0xb1/0xc0
[<ffffffff810854a2>] __do_softirq+0xf2/0x2f0
[<ffffffff810a4930>] ? smpboot_create_threads+0x80/0x80
[<ffffffff810856cd>] run_ksoftirqd+0x2d/0x50
[<ffffffff810a4a46>] smpboot_thread_fn+0x116/0x170
[<ffffffff810a11ae>] kthread+0xce/0xf0
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
[<ffffffff816c1b62>] ret_from_fork+0x42/0x70
[<ffffffff810a10e0>] ? kthread_freezable_should_stop+0x70/0x70
-----------------------------------------------------------------
[3] log 2 snippet
-------------------------------------------------------------------
INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks: { 77} (detected by 207,
t=60002 jiffies, g=40822, c=40821, q=0)
Task dump for CPU 77:
rds-stress R running task 0 2930 2867 0x0000008a
0000000000000018 0000000000000286 ffff893e00000000 ffffffff810ec828
ffff883f5628d160 0000000000000282 ffff89407ffda440 00000000f4d139b8
0000000100000000 ffff89407ffdae08 0000000000000000 000000004dcc9f40
Call Trace:
[<ffffffff810ec828>] ? hrtimer_try_to_cancel+0x48/0xe0
[<ffffffff8118d7b3>] ? __alloc_pages_nodemask+0x193/0x2b0
[<ffffffff810c52ac>] ? remove_wait_queue+0x3c/0x50
[<ffffffff811d747f>] ? alloc_pages_current+0xaf/0x170
[<ffffffffa2135298>] ? rds_page_remainder_alloc+0x48/0x2a0 [rds]
[<ffffffffa212f06d>] ? rds_message_copy_from_user+0x6d/0x130 [rds]
[<ffffffffa2133040>] ? rds_sendmsg+0x470/0x990 [rds]
[<ffffffff811ffa00>] ? rw_copy_check_uvector+0xa0/0x130
[<ffffffff815c9ffd>] ? sock_sendmsg+0x4d/0x60
[<ffffffff815cc93a>] ? ___sys_sendmsg+0x30a/0x330
[<ffffffff811b77fc>] ? handle_pte_fault+0x20c/0x230
[<ffffffff815ccb69>] ? __sys_sendmsg+0x49/0x90
[<ffffffff81023611>] ? syscall_trace_leave+0xf1/0x140
[<ffffffff815ccbc9>] ? SyS_sendmsg+0x19/0x20
[<ffffffff816c176e>] ? system_call_fastpath+0x12/0x71
{ 77} (t=60011 jiffies g=40822 c=40821 q=0)
Task dump for CPU 77:
rds-stress R running task 0 2930 2867 0x0000008a
000000000000000e ffff893f7f5439c0 ffffffff810a8621 000000000000004d
ffffffff81ab6540 ffff893f7f5439e0 ffffffff810a86cf 0000000000000082
ffffffff81ab6a40 ffff893f7f543a10 ffffffff810e3ad3 ffffffff81ab6540
Call Trace:
<IRQ> [<ffffffff810a8621>] sched_show_task+0xb1/0x120
[<ffffffff810a86cf>] dump_cpu_task+0x3f/0x50
[<ffffffff810e3ad3>] rcu_dump_cpu_stacks+0x83/0xc0
[<ffffffff810e490c>] print_cpu_stall+0xfc/0x170
[<ffffffff810e5eeb>] __rcu_pending+0x2bb/0x2c0
[<ffffffff810e5f8d>] rcu_check_callbacks+0x9d/0x170
[<ffffffff810e9772>] update_process_times+0x42/0x70
[<ffffffff810fb589>] tick_sched_handle+0x39/0x80
[<ffffffff810fb824>] tick_sched_timer+0x44/0x80
[<ffffffff810ebc04>] __run_hrtimer+0x74/0x1d0
[<ffffffff810fb7e0>] ? tick_nohz_handler+0xa0/0xa0
[<ffffffff811df679>] ? __free_slab+0xd9/0x1b0
[<ffffffff810ebf92>] hrtimer_interrupt+0x102/0x240
[<ffffffff810521f9>] local_apic_timer_interrupt+0x39/0x60
[<ffffffff816c47b5>] smp_apic_timer_interrupt+0x45/0x59
[<ffffffff816c263e>] apic_timer_interrupt+0x6e/0x80
[<ffffffff8118db64>] ? free_one_page+0x164/0x380
[<ffffffff8118de43>] ? __free_pages_ok+0xc3/0xe0
[<ffffffff8118e775>] __free_pages+0x25/0x40
[<ffffffffa212f4f0>] rds_message_purge+0x60/0x150 [rds]
[<ffffffffa212f624>] rds_message_put+0x44/0x80 [rds]
[<ffffffffa217d5b4>] rds_ib_send_cqe_handler+0x134/0x2d0 [rds_rdma]
[<ffffffff816c102b>] ? _raw_spin_unlock_irqrestore+0x1b/0x50
[<ffffffffa18fe273>] ? mlx4_ib_poll_cq+0xb3/0x2a0 [mlx4_ib]
[<ffffffffa21766f1>] poll_cq+0xa1/0xe0 [rds_rdma]
[<ffffffffa2177489>] rds_ib_tasklet_fn_send+0x79/0xf0 [rds_rdma]
[<ffffffff81084b31>] tasklet_action+0xb1/0xc0
[<ffffffff810854a2>] __do_softirq+0xf2/0x2f0
[<ffffffff810594f4>] ? native_apic_msr_eoi_write+0x14/0x20
[<ffffffff81085815>] irq_exit+0x125/0x130
[<ffffffff816c45f5>] do_IRQ+0x65/0x110
[<ffffffff816c22ae>] common_interrupt+0x6e/0x6e
<EOI> [<ffffffff8118bf28>] ? get_page_from_freelist+0x2b8/0x750
[<ffffffff810ec828>] ? hrtimer_try_to_cancel+0x48/0xe0
[<ffffffff8118d7b3>] __alloc_pages_nodemask+0x193/0x2b0
[<ffffffff810c52ac>] ? remove_wait_queue+0x3c/0x50
[<ffffffff811d747f>] alloc_pages_current+0xaf/0x170
[<ffffffffa2135298>] rds_page_remainder_alloc+0x48/0x2a0 [rds]
[<ffffffffa212f06d>] rds_message_copy_from_user+0x6d/0x130 [rds]
[<ffffffffa2133040>] rds_sendmsg+0x470/0x990 [rds]
[<ffffffff811ffa00>] ? rw_copy_check_uvector+0xa0/0x130
[<ffffffff815c9ffd>] sock_sendmsg+0x4d/0x60
[<ffffffff815cc93a>] ___sys_sendmsg+0x30a/0x330
[<ffffffff811b77fc>] ? handle_pte_fault+0x20c/0x230
[<ffffffff815ccb69>] __sys_sendmsg+0x49/0x90
[<ffffffff81023611>] ? syscall_trace_leave+0xf1/0x140
[<ffffffff815ccbc9>] SyS_sendmsg+0x19/0x20
[<ffffffff816c176e>] system_call_fastpath+0x12/0x71
------------------------------------------------------
[5] LOG 3:
------------------------------------------------------
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by
0, t=240007 jiffies, g=449043, c=449042, q=0)
All QSes seen, last rcu_sched kthread activity 240007
(4299336825-4299096818), jiffies_till_next_fqs=3, root ->qsmask 0x0
ora_lms0_orcltw R running task 0 22303 1
0x00000080
ffff8800c4651c00 00000000e7110062 ffff88010e803c18
ffffffff810b038f
ffff88010e8185c0 ffffffff81b22c40 ffff88010e803c98
ffffffff810e8f96
0000000000000000 ffffffff810b4deb ffff88010e817800
ffff88010e8185c0
Call Trace:
<IRQ> [<ffffffff810b038f>] sched_show_task+0xaf/0x120
[<ffffffff810e8f96>] rcu_check_callbacks+0x7e6/0x7f0
[<ffffffff810b4deb>] ? account_user_time+0x8b/0xa0
[<ffffffff810ee582>] update_process_times+0x42/0x70
[<ffffffff810fea65>] tick_sched_handle.isra.18+0x25/0x60
[<ffffffff810feae4>] tick_sched_timer+0x44/0x80
[<ffffffff810ef307>] __run_hrtimer+0x77/0x1d0
[<ffffffff810feaa0>] ? tick_sched_handle.isra.18+0x60/0x60
[<ffffffff810ef6e3>] hrtimer_interrupt+0x103/0x230
[<ffffffff8100a64d>] xen_timer_interrupt+0x3d/0x170
[<ffffffff814469a9>] ? add_interrupt_randomness+0x49/0x200
[<ffffffff810dd1ae>] handle_irq_event_percpu+0x3e/0x1a0
[<ffffffff810e0cfd>] handle_percpu_irq+0x3d/0x60
[<ffffffff810dc7ab>] generic_handle_irq+0x2b/0x40
[<ffffffff813fe91f>] evtchn_2l_handle_events+0x26f/0x280
[<ffffffff81085bba>] ? __do_softirq+0x18a/0x2d0
[<ffffffff813fbe8f>] __xen_evtchn_do_upcall+0x4f/0x90
[<ffffffff813fddf4>] xen_evtchn_do_upcall+0x34/0x50
[<ffffffff8170f35e>] xen_hvm_callback_vector+0x6e/0x80
<EOI>
rcu_sched kthread starved for 240007 jiffies!
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by
0, t=420012 jiffies, g=449043, c=449042, q=0)
All QSes seen, last rcu_sched kthread activity 420012
(4299516830-4299096818), jiffies_till_next_fqs=3, root ->qsmask 0x0
ora_lms0_orcltw R running task 0 22303 1
0x00000080
ffff8800c4651c00 00000000e7110062 ffff88010e803c18
ffffffff810b038f
ffff88010e8185c0 ffffffff81b22c40 ffff88010e803c98
ffffffff810e8f96
0000000000000000 ffff88010e817800 0000000000017800
ffff88010e8185c0
Call Trace:
<IRQ> [<ffffffff810b038f>] sched_show_task+0xaf/0x120
[<ffffffff810e8f96>] rcu_check_callbacks+0x7e6/0x7f0
[<ffffffff810ee582>] update_process_times+0x42/0x70
[<ffffffff810fea65>] tick_sched_handle.isra.18+0x25/0x60
[<ffffffff810feae4>] tick_sched_timer+0x44/0x80
[<ffffffff810ef307>] __run_hrtimer+0x77/0x1d0
[<ffffffff810feaa0>] ? tick_sched_handle.isra.18+0x60/0x60
[<ffffffff810ef6e3>] hrtimer_interrupt+0x103/0x230
[<ffffffff8100a64d>] xen_timer_interrupt+0x3d/0x170
[<ffffffff814469a9>] ? add_interrupt_randomness+0x49/0x200
[<ffffffff810dd1ae>] handle_irq_event_percpu+0x3e/0x1a0
[<ffffffff810e0cfd>] handle_percpu_irq+0x3d/0x60
[<ffffffff810dc7ab>] generic_handle_irq+0x2b/0x40
[<ffffffff813fe91f>] evtchn_2l_handle_events+0x26f/0x280
[<ffffffff813fbe8f>] __xen_evtchn_do_upcall+0x4f/0x90
[<ffffffff813fddf4>] xen_evtchn_do_upcall+0x34/0x50
[<ffffffff8170f35e>] xen_hvm_callback_vector+0x6e/0x80
<EOI> [<ffffffff81024847>] ?
do_audit_syscall_entry+0x67/0x70
[<ffffffff81025eb3>] syscall_trace_enter_phase1+0x143/0x1a0
[<ffffffff8112ac86>] ? __audit_syscall_exit+0x1e6/0x280
[<ffffffff81026216>] ? syscall_trace_leave+0xc6/0x120
[<ffffffff8170d69a>] tracesys+0xd/0x44
rcu_sched kthread starved for 420012 jiffies!
INFO: rcu_sched detected stalls on CPUs/tasks: {} (detected by
0, t=600017 jiffies, g=449043, c=449042, q=0)
All QSes seen, last rcu_sched kthread activity 600017
(4299696835-4299096818), jiffies_till_next_fqs=3, root ->qsmask 0x0
ora_lms0_orcltw R running task 0 22303 1
0x00000080
ffff8800c4651c00 00000000e7110062 ffff88010e803c18
ffffffff810b038f
ffff88010e8185c0 ffffffff81b22c40 ffff88010e803c98
ffffffff810e8f96
0000000000000000 ffffffff810b4deb ffff88010e817800
ffff88010e8185c0
Call Trace:
<IRQ> [<ffffffff810b038f>] sched_show_task+0xaf/0x120
[<ffffffff810e8f96>] rcu_check_callbacks+0x7e6/0x7f0
[<ffffffff810b4deb>] ? account_user_time+0x8b/0xa0
[<ffffffff810ee582>] update_process_times+0x42/0x70
[<ffffffff810fea65>] tick_sched_handle.isra.18+0x25/0x60
[<ffffffff810feae4>] tick_sched_timer+0x44/0x80
[<ffffffff810ef307>] __run_hrtimer+0x77/0x1d0
[<ffffffff810feaa0>] ? tick_sched_handle.isra.18+0x60/0x60
[<ffffffff810ef6e3>] hrtimer_interrupt+0x103/0x230
[<ffffffff8100a64d>] xen_timer_interrupt+0x3d/0x170
[<ffffffff814469a9>] ? add_interrupt_randomness+0x49/0x200
[<ffffffff810dd1ae>] handle_irq_event_percpu+0x3e/0x1a0
[<ffffffff810e0cfd>] handle_percpu_irq+0x3d/0x60
[<ffffffff810dc7ab>] generic_handle_irq+0x2b/0x40
[<ffffffff813fe91f>] evtchn_2l_handle_events+0x26f/0x280
[<ffffffff813fbe8f>] __xen_evtchn_do_upcall+0x4f/0x90
[<ffffffff813fddf4>] xen_evtchn_do_upcall+0x34/0x50
[<ffffffff8170f35e>] xen_hvm_callback_vector+0x6e/0x80
<EOI>
rcu_sched kthread starved for 600017 jiffies!
------------------------------------------------------
[5] RCU config
-----------------------------------------------
# RCU Subsystem
CONFIG_TREE_RCU=y
CONFIG_SRCU=y
# CONFIG_TASKS_RCU is not set
CONFIG_RCU_STALL_COMMON=y
CONFIG_RCU_USER_QS=y
CONFIG_RCU_FANOUT=64
CONFIG_RCU_FANOUT_LEAF=16
# CONFIG_RCU_FANOUT_EXACT is not set
# CONFIG_RCU_FAST_NO_HZ is not set
# CONFIG_TREE_RCU_TRACE is not set
CONFIG_RCU_KTHREAD_PRIO=0
CONFIG_RCU_NOCB_CPU=y
# CONFIG_RCU_NOCB_CPU_NONE is not set
# CONFIG_RCU_NOCB_CPU_ZERO is not set
CONFIG_RCU_NOCB_CPU_ALL=y
# CONFIG_RCU_EXPEDITE_BOOT is not set
# RCU Debugging
# CONFIG_PROVE_RCU is not set
# CONFIG_SPARSE_RCU_POINTER is not set
# CONFIG_RCU_TORTURE_TEST is not set
CONFIG_RCU_CPU_STALL_TIMEOUT=60
# CONFIG_RCU_CPU_STALL_INFO is not set
# CONFIG_RCU_TRACE is not set
--------------------------------------------------
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