rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=112/1/0x4000000000000004 softirq=276886/276889 fqs=11 (t=10501 jiffies g=325133 q=482) rcu: rcu_preempt kthread starved for 10310 jiffies! g325133 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 28536 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x87f/0xcd0 kernel/sched/core.c:4081 schedule+0x188/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xe0d/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 0 CPU: 0 PID: 1624 Comm: syz-executor.0 Not tainted 5.5.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaa/0x190 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16f/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0x1521/0x1ab0 kernel/rcu/tree.c:2271 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x5f/0x80 kernel/locking/spinlock.c:199 Code: ff df 80 3c 08 00 74 0c 48 c7 c7 38 91 0a 89 e8 d7 ac b5 f9 48 83 3d 87 7f 0d 01 00 74 26 fb 66 0f 1f 44 00 00 bf 01 00 00 00 4c d1 55 f9 65 8b 05 01 0c 05 78 85 c0 74 03 5b 5d c3 e8 b3 4c RSP: 0018:ffffc90000007d98 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1215227 RBX: ffff8880aec27080 RCX: dffffc0000000000 RDX: 0000000000000102 RSI: ffffffff81668386 RDI: 0000000000000001 RBP: ffffc90000007da0 R08: ffff888027282918 R09: ffffed1015d84e11 R10: ffffed1015d84e11 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88806508ba00 R14: ffff88806508ba08 R15: ffffffff8728ecb0 expire_timers kernel/time/timer.c:1448 [inline] __run_timers+0x766/0x970 kernel/time/timer.c:1773 run_timer_softirq+0x4a/0x90 kernel/time/timer.c:1786 __do_softirq+0x283/0x7bd arch/x86/include/asm/paravirt.h:762 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:lock_is_held_type+0x25c/0x2b0 kernel/locking/lockdep.c:4523 Code: 28 91 0a 89 48 c1 e8 03 42 80 3c 30 00 74 0c 48 c7 c7 28 91 0a 89 e8 c3 2b 57 00 48 83 3d 63 fe ae 07 00 74 56 4c 89 e7 57 9d <0f> 1f 44 00 00 89 d8 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d c3 RSP: 0018:ffffc90017b1fc20 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1215225 RBX: 0000000000000000 RCX: 0000000000040000 RDX: ffffc90002129000 RSI: 00000000ffffffff RDI: 0000000000000282 RBP: ffffc90017b1fc70 R08: ffffffff839e3f97 R09: ffffed1015d86fc5 R10: ffffed1015d86fc5 R11: 0000000000000000 R12: 0000000000000282 R13: ffff888027282954 R14: dffffc0000000000 R15: 1ffff11004e5052a lock_is_held include/linux/lockdep.h:361 [inline] schedule_debug+0x126/0x300 kernel/sched/core.c:3895 __schedule+0x86/0xcd0 kernel/sched/core.c:4013 preempt_schedule_irq+0xca/0x150 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:do_fcntl+0xcc9/0x11f0 fs/fcntl.c:433 Code: dd 7d b5 ff eb 3b e8 d6 7d b5 ff e9 18 01 00 00 e8 cc 7d b5 ff 31 db 65 48 8b 04 25 28 00 00 00 48 3b 45 d0 0f 85 17 05 00 00 <48> 89 d8 48 83 c4 40 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 a0 7d b5 RSP: 0018:ffffc90017b1fe30 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dd543a4b1d03b400 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffff8880272820c0 RDI: 0000000000000001 RBP: ffffc90017b1fe98 R08: dffffc0000000000 R09: ffffed10032dbe57 R10: ffffed10032dbe57 R11: 0000000000000000 R12: ffff8880196df2a8 R13: 0000000000000003 R14: 0000000000042002 R15: ffff8880196df2b0 __do_sys_fcntl fs/fcntl.c:463 [inline] __se_sys_fcntl+0xde/0x1b0 fs/fcntl.c:448 __x64_sys_fcntl+0x7b/0x90 fs/fcntl.c:448 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b349 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:00007f5a69bb0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 00007f5a69bb16d4 RCX: 000000000045b349 RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000000c1 R14: 00000000004c1fe0 R15: 000000000075bf2c