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Date: Tue, 24 Nov 2015 16:27:50 +0000
From: Juri Lelli <juri.lelli@....com>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
ALKML <linux-arm-kernel@...ts.infradead.org>, juri.lelli@....com
Subject: suspicious RCU usage on 4.4-rc2 ARM platform
Hi Paul,
I'm hitting these splats while running simple hotplug tests on an ARM
TC2 platform. The following seems to cure it, but I don't think it never
made it to mainline:
https://lkml.org/lkml/2015/5/12/892
Any reason why?
Thanks,
- Juri
root@...ericarmv7a:~# [ 283.868236] CPU0 attaching NULL sched-domain.
[ 283.882257] CPU1 attaching NULL sched-domain.
[ 283.895367] CPU2 attaching NULL sched-domain.
[ 283.908464] CPU3 attaching NULL sched-domain.
[ 283.921571] CPU4 attaching NULL sched-domain.
[ 283.935655] CPU0 attaching sched-domain:
[ 283.947419] domain 0: span 0,3-4 level MC
[ 283.959718] groups: 0 3 4
[ 283.968142] domain 1: span 0,2-4 level DIE
[ 283.980960] groups: 0,3-4 (cpu_capacity = 3072) 2
[ 283.996070] CPU2 attaching sched-domain:
[ 284.007833] domain 0: span 0,2-4 level DIE
[ 284.020669] groups: 2 0,3-4 (cpu_capacity = 3072)
[ 284.035526] CPU3 attaching sched-domain:
[ 284.047286] domain 0: span 0,3-4 level MC
[ 284.059577] groups: 3 4 0
[ 284.068046] domain 1: span 0,2-4 level DIE
[ 284.080873] groups: 0,3-4 (cpu_capacity = 3072) 2
[ 284.096048] CPU4 attaching sched-domain:
[ 284.107814] domain 0: span 0,3-4 level MC
[ 284.120378] groups: 4 0 3
[ 284.128832] domain 1: span 0,2-4 level DIE
[ 284.141654] groups: 0,3-4 (cpu_capacity = 3072) 2
[ 284.204863]
[ 284.204868] ===============================
[ 284.204871] [ INFO: suspicious RCU usage. ]
[ 284.204878] 4.4.0-rc2+ #278 Not tainted
[ 284.204882] -------------------------------
[ 284.204888] /media/hdd1tb/work/integration/kernel/include/trace/events/sched.h:89 suspicious rcu_dereference_check() usage!
[ 284.204891]
[ 284.204891] other info that might help us debug this:
[ 284.204891]
[ 284.204896]
[ 284.204896] RCU used illegally from offline CPU!
[ 284.204896] rcu_scheduler_active = 1, debug_locks = 1
[ 284.204901] 2 locks held by swapper/1/0:
[ 284.204928] #0: ((cpu_died).wait.lock){......}, at: [<c0053f97>] complete+0x13/0x30
[ 284.204951] #1: (&p->pi_lock){-.-.-.}, at: [<c003fe27>] try_to_wake_up+0x23/0x390
[ 284.204955]
[ 284.204955] stack backtrace:
[ 284.204962] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.0-rc2+ #278
[ 284.204966] Hardware name: ARM-Versatile Express
[ 284.204981] [<c0014225>] (unwind_backtrace) from [<c0010e25>] (show_stack+0x11/0x14)
[ 284.204993] [<c0010e25>] (show_stack) from [<c02ed79d>] (dump_stack+0x55/0x78)
[ 284.205003] [<c02ed79d>] (dump_stack) from [<c004004d>] (try_to_wake_up+0x249/0x390)
[ 284.205011] [<c004004d>] (try_to_wake_up) from [<c005396b>] (__wake_up_common+0x37/0x58)
[ 284.205018] [<c005396b>] (__wake_up_common) from [<c005399f>] (__wake_up_locked+0x13/0x18)
[ 284.205025] [<c005399f>] (__wake_up_locked) from [<c0053fa9>] (complete+0x25/0x30)
[ 284.205032] [<c0053fa9>] (complete) from [<c0012e6d>] (arch_cpu_idle_dead+0x29/0x6c)
[ 284.205039] [<c0012e6d>] (arch_cpu_idle_dead) from [<c005441d>] (cpu_startup_entry+0x2f5/0x330)
[ 284.205047] [<c005441d>] (cpu_startup_entry) from [<80009431>] (0x80009431)
[ 284.205054]
[ 284.205057] ===============================
[ 284.205060] [ INFO: suspicious RCU usage. ]
[ 284.205064] 4.4.0-rc2+ #278 Not tainted
[ 284.205066] -------------------------------
[ 284.205071] /media/hdd1tb/work/integration/kernel/kernel/sched/fair.c:4938 suspicious rcu_dereference_check() usage!
[ 284.205074]
[ 284.205074] other info that might help us debug this:
[ 284.205074]
[ 284.205078]
[ 284.205078] RCU used illegally from offline CPU!
[ 284.205078] rcu_scheduler_active = 1, debug_locks = 1
[ 284.205081] 3 locks held by swapper/1/0:
[ 284.205098] #0: ((cpu_died).wait.lock){......}, at: [<c0053f97>] complete+0x13/0x30
[ 284.205116] #1: (&p->pi_lock){-.-.-.}, at: [<c003fe27>] try_to_wake_up+0x23/0x390
[ 284.205133] #2: (rcu_read_lock){......}, at: [<c0046eae>] select_task_rq_fair+0x32/0x894
[ 284.205136]
[ 284.205136] stack backtrace:
[ 284.205141] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.0-rc2+ #278
[ 284.205145] Hardware name: ARM-Versatile Express
[ 284.205154] [<c0014225>] (unwind_backtrace) from [<c0010e25>] (show_stack+0x11/0x14)
[ 284.205163] [<c0010e25>] (show_stack) from [<c02ed79d>] (dump_stack+0x55/0x78)
[ 284.205171] [<c02ed79d>] (dump_stack) from [<c00473e7>] (select_task_rq_fair+0x56b/0x894)
[ 284.205180] [<c00473e7>] (select_task_rq_fair) from [<c003fef1>] (try_to_wake_up+0xed/0x390)
[ 284.205188] [<c003fef1>] (try_to_wake_up) from [<c005396b>] (__wake_up_common+0x37/0x58)
[ 284.205195] [<c005396b>] (__wake_up_common) from [<c005399f>] (__wake_up_locked+0x13/0x18)
[ 284.205201] [<c005399f>] (__wake_up_locked) from [<c0053fa9>] (complete+0x25/0x30)
[ 284.205208] [<c0053fa9>] (complete) from [<c0012e6d>] (arch_cpu_idle_dead+0x29/0x6c)
[ 284.205215] [<c0012e6d>] (arch_cpu_idle_dead) from [<c005441d>] (cpu_startup_entry+0x2f5/0x330)
[ 284.205221] [<c005441d>] (cpu_startup_entry) from [<80009431>] (0x80009431)
[ 284.205228]
[ 284.205231] ===============================
[ 284.205234] [ INFO: suspicious RCU usage. ]
[ 284.205238] 4.4.0-rc2+ #278 Not tainted
[ 284.205241] -------------------------------
[ 284.205245] /media/hdd1tb/work/integration/kernel/include/trace/events/ipi.h:35 suspicious rcu_dereference_check() usage!
[ 284.205247]
[ 284.205247] other info that might help us debug this:
[ 284.205247]
[ 284.205251]
[ 284.205251] RCU used illegally from offline CPU!
[ 284.205251] rcu_scheduler_active = 1, debug_locks = 1
[ 284.205255] 2 locks held by swapper/1/0:
[ 284.205271] #0: ((cpu_died).wait.lock){......}, at: [<c0053f97>] complete+0x13/0x30
[ 284.205289] #1: (&p->pi_lock){-.-.-.}, at: [<c003fe27>] try_to_wake_up+0x23/0x390
[ 284.205292]
[ 284.205292] stack backtrace:
[ 284.205297] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.0-rc2+ #278
[ 284.205300] Hardware name: ARM-Versatile Express
[ 284.205310] [<c0014225>] (unwind_backtrace) from [<c0010e25>] (show_stack+0x11/0x14)
[ 284.205318] [<c0010e25>] (show_stack) from [<c02ed79d>] (dump_stack+0x55/0x78)
[ 284.205325] [<c02ed79d>] (dump_stack) from [<c0012a97>] (smp_cross_call+0x6f/0xf0)
[ 284.205334] [<c0012a97>] (smp_cross_call) from [<c003ff8b>] (try_to_wake_up+0x187/0x390)
[ 284.205341] [<c003ff8b>] (try_to_wake_up) from [<c005396b>] (__wake_up_common+0x37/0x58)
[ 284.205348] [<c005396b>] (__wake_up_common) from [<c005399f>] (__wake_up_locked+0x13/0x18)
[ 284.205355] [<c005399f>] (__wake_up_locked) from [<c0053fa9>] (complete+0x25/0x30)
[ 284.205361] [<c0053fa9>] (complete) from [<c0012e6d>] (arch_cpu_idle_dead+0x29/0x6c)
[ 284.205368] [<c0012e6d>] (arch_cpu_idle_dead) from [<c005441d>] (cpu_startup_entry+0x2f5/0x330)
[ 284.205375] [<c005441d>] (cpu_startup_entry) from [<80009431>] (0x80009431)
[ 284.205634]
[ 284.205637] ===============================
[ 284.205640] [ INFO: suspicious RCU usage. ]
[ 284.205644] 4.4.0-rc2+ #278 Not tainted
[ 284.205647] -------------------------------
[ 284.205651] /media/hdd1tb/work/integration/kernel/kernel/sched/core.c:1680 suspicious rcu_dereference_check() usage!
[ 284.205654]
[ 284.205654] other info that might help us debug this:
[ 284.205654]
[ 284.205658]
[ 284.205658] RCU used illegally from offline CPU!
[ 284.205658] rcu_scheduler_active = 1, debug_locks = 1
[ 284.205662] 3 locks held by swapper/1/0:
[ 284.205678] #0: ((cpu_died).wait.lock){......}, at: [<c0053f97>] complete+0x13/0x30
[ 284.205696] #1: (&p->pi_lock){-.-.-.}, at: [<c003fe27>] try_to_wake_up+0x23/0x390
[ 284.205714] #2: (rcu_read_lock){......}, at: [<c003cde0>] ttwu_stat+0x30/0x218
[ 284.205716]
[ 284.205716] stack backtrace:
[ 284.205721] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.0-rc2+ #278
[ 284.205725] Hardware name: ARM-Versatile Express
[ 284.205735] [<c0014225>] (unwind_backtrace) from [<c0010e25>] (show_stack+0x11/0x14)
[ 284.205744] [<c0010e25>] (show_stack) from [<c02ed79d>] (dump_stack+0x55/0x78)
[ 284.205752] [<c02ed79d>] (dump_stack) from [<c003cf45>] (ttwu_stat+0x195/0x218)
[ 284.205761] [<c003cf45>] (ttwu_stat) from [<c003ffbf>] (try_to_wake_up+0x1bb/0x390)
[ 284.205769] [<c003ffbf>] (try_to_wake_up) from [<c005396b>] (__wake_up_common+0x37/0x58)
[ 284.205776] [<c005396b>] (__wake_up_common) from [<c005399f>] (__wake_up_locked+0x13/0x18)
[ 284.205783] [<c005399f>] (__wake_up_locked) from [<c0053fa9>] (complete+0x25/0x30)
[ 284.205789] [<c0053fa9>] (complete) from [<c0012e6d>] (arch_cpu_idle_dead+0x29/0x6c)
[ 284.205796] [<c0012e6d>] (arch_cpu_idle_dead) from [<c005441d>] (cpu_startup_entry+0x2f5/0x330)
[ 284.205802] [<c005441d>] (cpu_startup_entry) from [<80009431>] (0x80009431)
[ 284.207658] CPU1: shutdown
[
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