rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=8125, q=1010) rcu: All QSes seen, last rcu_preempt kthread activity 10444 (4294967725-4294957281), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.5 R running task 28352 8727 8573 0x80000004 Call Trace: sched_show_task+0x408/0x560 kernel/sched/core.c:5952 print_other_cpu_stall kernel/rcu/tree_stall.h:430 [inline] check_cpu_stall kernel/rcu/tree_stall.h:558 [inline] rcu_pending kernel/rcu/tree.c:3030 [inline] rcu_sched_clock_irq+0x147c/0x1970 kernel/rcu/tree.c:2276 update_process_times+0x12c/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:171 [inline] tick_sched_timer+0x254/0x410 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x3cf/0x7d0 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xa5/0xd0 kernel/locking/spinlock.c:191 Code: b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 50 d3 0a 89 e8 fa 85 b5 f9 48 83 3d f2 78 0f 01 00 74 2c 4c 89 f7 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 dc 32 56 f9 65 8b 05 51 c3 06 78 RSP: 0000:ffffc90001607e60 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1215a6a RBX: ffff88803ff1b2c0 RCX: dffffc0000000000 RDX: dffffc0000000000 RSI: 000000000003ffff RDI: 0000000000000282 RBP: ffffc90001607ee8 R08: ffffffff817a3680 R09: ffffed1007fe3659 R10: ffffed1007fe3659 R11: 0000000000000000 R12: ffff8880567c02c0 R13: ffff8880567c09e0 R14: 0000000000000282 R15: ffff88803ff1b488 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline] force_sig_info_to_task+0x272/0x2e0 kernel/signal.c:1334 force_sig_fault_to_task kernel/signal.c:1676 [inline] force_sig_fault+0xbb/0x130 kernel/signal.c:1683 page_fault+0x39/0x40 arch/x86/entry/entry_64.S:1203 RIP: 0033:0x4044f9 Code: d0 ff ff ff 01 48 8b 7c 24 20 c7 44 24 2c 00 00 00 00 e8 ca 01 02 00 85 c0 75 23 48 6b 44 24 18 18 8b 7c 24 28 48 03 44 24 30 <48> 8b 48 10 48 8b 50 08 48 8b 30 e8 67 1d 01 00 89 44 24 2c 64 f0 RSP: 002b:00007f669e0999e0 EFLAGS: 00010202 RAX: 0000000027b21b68 RBX: 00007f669e09a6d4 RCX: 00000000004162a7 RDX: 1e225e2db78186d0 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 000000000076bf20 R08: 00007f669e0999e0 R09: 000000000076bf20 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff R13: 0000000000000c1c R14: 00000000004c13cb R15: 000000000076bf2c rcu: rcu_preempt kthread starved for 10444 jiffies! g8125 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29072 10 2 0x80004000 Call Trace: