rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=103677, q=319) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295009044-4294998541), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.0 R running task 27960 4245 8776 0x00004008 Call Trace: sched_show_task+0x411/0x560 kernel/sched/core.c:5954 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+0x188c/0x1aa0 kernel/rcu/tree.c:2276 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:171 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x3f3/0x840 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x37c/0xda0 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 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+0xa8/0xe0 kernel/locking/spinlock.c:191 Code: b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 10 d1 2a 89 e8 87 b3 9d f9 48 83 3d ff ba 14 01 00 74 2d 4c 89 f7 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 29 d6 3c f9 65 8b 05 9e 07 ec 77 RSP: 0000:ffffc90000007cb8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1255a22 RBX: ffff88809ca8d2a8 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffffc90000007cc8 R08: ffff88805127ed58 R09: fffffbfff1405526 R10: fffffbfff1405526 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000286 R15: ffff88809ca8d2a8 spin_unlock_irqrestore include/linux/spinlock.h:393 [inline] skb_dequeue+0x122/0x160 net/core/skbuff.c:3042 garp_queue_xmit net/802/garp.c:258 [inline] garp_join_timer+0x95/0x130 net/802/garp.c:410 call_timer_fn+0x95/0x170 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0x776/0x970 kernel/time/timer.c:1773 run_timer_softirq+0x4a/0x90 kernel/time/timer.c:1786 __do_softirq+0x283/0x7bd kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x227/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:preempt_schedule_irq+0xc0/0x150 kernel/sched/core.c:4339 Code: 67 f9 43 80 3c 37 00 74 0c 48 c7 c7 20 d1 2a 89 e8 95 72 9e f9 48 83 3d 1d 7a 15 01 00 0f 84 82 00 00 00 fb 66 0f 1f 44 00 00 01 00 00 00 e8 66 ed ff ff 43 80 3c 34 00 74 0c 48 c7 c7 18 d1 RSP: 0000:ffffc900056c7d98 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffff88805127ed94 RBX: 0000000000000000 RCX: 0000000000040000 RDX: ffffc90002309000 RSI: 000000000000ad7f RDI: ffff88805127ed44 RBP: ffffc900056c7db8 R08: ffff88805127ed58 R09: ffffed1015d47004 R10: ffffed1015d47004 R11: 0000000000000000 R12: 1ffffffff1255a23 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffffffff1255a24 retint_kernel+0x1b/0x2b RIP: 0010:check_memory_region+0x224/0x2f0 mm/kasan/generic.c:192 Code: 89 cf 49 8d 5e 07 4d 85 f6 49 0f 49 de 48 83 e3 f8 49 29 de 74 11 45 0f b6 1f 45 84 db 75 65 49 ff c7 49 ff ce 75 ef 5b 41 5c <41> 5d 41 5e 41 5f 5d c3 45 84 db 75 50 45 8a 59 01 45 84 db 0f 85 RSP: 0000:ffffc900056c7e78 EFLAGS: 00000256 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 1ffff1100a24fca0 RCX: ffffffff881552ef RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88805127e500 RBP: ffffc900056c7e90 R08: dffffc0000000000 R09: ffffed100a24fca1 R10: ffffed100a24fca1 R11: 0000000000000000 R12: dffffc0000000000 R13: dffffc0000000001 R14: 0000000000000001 R15: ffff88805127e500 __kasan_check_read+0x11/0x20 mm/kasan/common.c:95 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] test_ti_thread_flag include/linux/thread_info.h:84 [inline] need_resched include/linux/sched.h:1820 [inline] schedule+0x19f/0x210 kernel/sched/core.c:4158 exit_to_usermode_loop arch/x86/entry/common.c:150 [inline] prepare_exit_to_usermode+0x2cd/0x5b0 arch/x86/entry/common.c:195 ret_from_intr+0x26/0x36 RIP: 0033:0x45b399 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f8115626c78 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 00007f81156276d4 RCX: 000000000045b399 RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000000c1 R14: 00000000004c2040 R15: 000000000075bf2c rcu: rcu_preempt kthread starved for 10552 jiffies! g103677 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28792 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3386 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4082 schedule+0x188/0x210 kernel/sched/core.c:4156 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1658 [inline] rcu_gp_kthread+0xe8d/0x17e0 kernel/rcu/tree.c:1818 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352