INFO: rcu detected stall in sched

INFO: rcu detected stall in sched_setattr
Status: public: reported C repro on 2019/04/14 08:51
Reported-by: syzbot+99b23138e317c976a949@syzkaller.appspotmail.com
First crash: 354d, last: 169d

Sample crash report:

INFO: rcu_preempt detected stalls on CPUs/tasks:
	Tasks blocked on level-0 rcu_node (CPUs 0-1): P30341
	(detected by 0, t=10503 jiffies, g=953, c=952, q=254578)
syz-executor052 R  running task    30200 30341   2095 0x00000004
 ffff8801db607c60 ffffffff813fabdd ffffffff813fa9e4 ffff8801ccd7c740
 ffffffff830d17c0 0000000000000096 ffff8801ccd7cb20 dffffc0000000000
 ffff8801db607c98 ffffffff81405319 00000000000003b8 000000000003e272
Call Trace:
 <IRQ> [  491.254223]  [<ffffffff813fabdd>] sched_show_task.cold.35+0x279/0x31f kernel/sched/core.c:5317
 [<ffffffff81405319>] rcu_print_detail_task_stall_rnp+0xc2/0xfe kernel/rcu/tree_plugin.h:530
 [<ffffffff8140643f>] rcu_print_detail_task_stall kernel/rcu/tree_plugin.h:543 [inline]
 [<ffffffff8140643f>] print_other_cpu_stall kernel/rcu/tree.c:1408 [inline]
 [<ffffffff8140643f>] check_cpu_stall kernel/rcu/tree.c:1520 [inline]
 [<ffffffff8140643f>] __rcu_pending kernel/rcu/tree.c:3487 [inline]
 [<ffffffff8140643f>] rcu_pending kernel/rcu/tree.c:3551 [inline]
 [<ffffffff8140643f>] rcu_check_callbacks.cold.69+0x757/0xd27 kernel/rcu/tree.c:2880
 [<ffffffff812675d0>] update_process_times+0x30/0x70 kernel/time/timer.c:1629
 [<ffffffff8129657a>] tick_sched_handle.isra.5+0x4a/0xf0 kernel/time/tick-sched.c:151
 [<ffffffff81296696>] tick_sched_timer+0x76/0x130 kernel/time/tick-sched.c:1190
 [<ffffffff8126a2f7>] __run_hrtimer kernel/time/hrtimer.c:1255 [inline]
 [<ffffffff8126a2f7>] __hrtimer_run_queues+0x357/0xe30 kernel/time/hrtimer.c:1319
 [<ffffffff8126c7e1>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1353
 [<ffffffff81091364>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:937
 [<ffffffff8281e26c>] smp_apic_timer_interrupt+0x7c/0xb0 arch/x86/kernel/apic/apic.c:961
 [<ffffffff8281bb2d>] apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> [  491.371385]  [<ffffffff82819b2e>] ? arch_local_irq_enable arch/x86/include/asm/paravirt.h:778 [inline]
 <EOI> [  491.371385]  [<ffffffff82819b2e>] ? __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:170 [inline]
 <EOI> [  491.371385]  [<ffffffff82819b2e>] ? _raw_spin_unlock_irq+0x2e/0x50 kernel/locking/spinlock.c:199
 [<ffffffff8280aaa0>] __schedule+0x1010/0x1b10 kernel/sched/core.c:3501
 [<ffffffff8280c02b>] preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:3711
 [<ffffffff8281ad14>] retint_kernel+0x1b/0x2d
 [<ffffffff8280be55>] preempt_schedule+0x25/0x30 kernel/sched/core.c:3634
 [<ffffffff810022b6>] ___preempt_schedule+0x16/0x18
 [<ffffffff8116d302>] __sched_setscheduler+0x1c12/0x2c30 kernel/sched/core.c:4407
 [<ffffffff8117b27c>] sched_setattr kernel/sched/core.c:4449 [inline]
 [<ffffffff8117b27c>] SYSC_sched_setattr kernel/sched/core.c:4623 [inline]
 [<ffffffff8117b27c>] SyS_sched_setattr+0x24c/0x3c0 kernel/sched/core.c:4602
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff8281a393>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
syz-executor052 R  running task    30200 30341   2095 0x80000004
 ffff8801db607c60 ffffffff813fabdd ffffffff813fa9e4 ffff8801ccd7c740
 ffffffff830d17c0 0000000000000096 ffff8801ccd7cb20 dffffc0000000000
 ffff8801db607c98 ffffffff81405319 ffffffff830d1b40 000000000003e272
Call Trace:
 <IRQ> [  491.523864]  [<ffffffff813fabdd>] sched_show_task.cold.35+0x279/0x31f kernel/sched/core.c:5317
 [<ffffffff81405319>] rcu_print_detail_task_stall_rnp+0xc2/0xfe kernel/rcu/tree_plugin.h:530
 [<ffffffff81406497>] rcu_print_detail_task_stall kernel/rcu/tree_plugin.h:545 [inline]
 [<ffffffff81406497>] print_other_cpu_stall kernel/rcu/tree.c:1408 [inline]
 [<ffffffff81406497>] check_cpu_stall kernel/rcu/tree.c:1520 [inline]
 [<ffffffff81406497>] __rcu_pending kernel/rcu/tree.c:3487 [inline]
 [<ffffffff81406497>] rcu_pending kernel/rcu/tree.c:3551 [inline]
 [<ffffffff81406497>] rcu_check_callbacks.cold.69+0x7af/0xd27 kernel/rcu/tree.c:2880
 [<ffffffff812675d0>] update_process_times+0x30/0x70 kernel/time/timer.c:1629
 [<ffffffff8129657a>] tick_sched_handle.isra.5+0x4a/0xf0 kernel/time/tick-sched.c:151
 [<ffffffff81296696>] tick_sched_timer+0x76/0x130 kernel/time/tick-sched.c:1190
 [<ffffffff8126a2f7>] __run_hrtimer kernel/time/hrtimer.c:1255 [inline]
 [<ffffffff8126a2f7>] __hrtimer_run_queues+0x357/0xe30 kernel/time/hrtimer.c:1319
 [<ffffffff8126c7e1>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1353
 [<ffffffff81091364>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:937
 [<ffffffff8281e26c>] smp_apic_timer_interrupt+0x7c/0xb0 arch/x86/kernel/apic/apic.c:961
 [<ffffffff8281bb2d>] apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> [  491.641294]  [<ffffffff82819b2e>] ? arch_local_irq_enable arch/x86/include/asm/paravirt.h:778 [inline]
 <EOI> [  491.641294]  [<ffffffff82819b2e>] ? __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:170 [inline]
 <EOI> [  491.641294]  [<ffffffff82819b2e>] ? _raw_spin_unlock_irq+0x2e/0x50 kernel/locking/spinlock.c:199
 [<ffffffff8280aaa0>] __schedule+0x1010/0x1b10 kernel/sched/core.c:3501
 [<ffffffff8280c02b>] preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:3711
 [<ffffffff8281ad14>] retint_kernel+0x1b/0x2d
 [<ffffffff8280be55>] preempt_schedule+0x25/0x30 kernel/sched/core.c:3634
 [<ffffffff810022b6>] ___preempt_schedule+0x16/0x18
 [<ffffffff8116d302>] __sched_setscheduler+0x1c12/0x2c30 kernel/sched/core.c:4407
 [<ffffffff8117b27c>] sched_setattr kernel/sched/core.c:4449 [inline]
 [<ffffffff8117b27c>] SYSC_sched_setattr kernel/sched/core.c:4623 [inline]
 [<ffffffff8117b27c>] SyS_sched_setattr+0x24c/0x3c0 kernel/sched/core.c:4602
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff8281a393>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Crashes (2):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-android-49-kasan-gce-root	2018/12/18 22:09	https://android.googlesource.com/kernel/common android-4.9	2ca7ab11	4edaba93	.config	log	report	syz	C	dan.j.williams@intel.com, dwmw@amazon.co.uk, gregkh@linuxfoundation.org, hpa@zytor.com, linux-kernel@vger.kernel.org, luto@kernel.org, mingo@redhat.com, satyat@google.com, tglx@linutronix.de, thgarnie@google.com, x86@kernel.org
ci-android-49-kasan-gce-root	2019/06/22 11:48	https://android.googlesource.com/kernel/common android-4.9	b9dc7bb8	34bf9440	.config	log	report	syz	C	gregkh@linuxfoundation.org, hpa@zytor.com, jcm@redhat.com, linux-kernel@vger.kernel.org, mingo@redhat.com, satyat@google.com, tglx@linutronix.de, thgarnie@google.com, x86@kernel.org