rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-....: (10500 ticks this GP) idle=236/1/0x4000000000000004 softirq=66865/66865 fqs=5246 (t=10501 jiffies g=82837 q=185494) NMI backtrace for cpu 1 CPU: 1 PID: 20777 Comm: syz-executor.1 Not tainted 5.6.0-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+0x1e9/0x30e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x199/0x2a0 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3225 [inline] rcu_sched_clock_irq+0x186a/0x1ac0 kernel/rcu/tree.c:2296 update_process_times+0x12c/0x180 kernel/time/timer.c:1727 tick_sched_handle kernel/time/tick-sched.c:176 [inline] tick_sched_timer+0x254/0x410 kernel/time/tick-sched.c:1320 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x42d/0x930 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1113 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1138 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:kmem_cache_free+0xcd/0xf0 mm/slab.c:3695 Code: 57 9d 0f 1f 44 00 00 e8 a1 4d c8 ff eb 21 5b 41 5c 41 5e 41 5f c3 e8 52 4b c8 ff 48 83 3d 0a ff 7a 07 00 74 22 4c 89 f7 57 9d <0f> 1f 44 00 00 4c 89 e7 4c 89 fe 5b 41 5c 41 5e 41 5f e9 5c 01 00 RSP: 0018:ffffc90000da8cc8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffff1100779d900 RBX: ffff8882195628c0 RCX: ffffffff8158eba2 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: 1ffff11011be5320 R08: dffffc0000000000 R09: fffffbfff1628aa6 R10: fffffbfff1628aa6 R11: 0000000000000000 R12: ffffffff86cf3796 R13: ffff88808df29810 R14: 0000000000000286 R15: ffff888098154680 inet_twsk_bind_unhash net/ipv4/inet_timewait_sock.c:39 [inline] inet_twsk_kill+0x436/0x5a0 net/ipv4/inet_timewait_sock.c:59 call_timer_fn+0x91/0x160 kernel/time/timer.c:1405 expire_timers kernel/time/timer.c:1450 [inline] __run_timers+0x776/0x970 kernel/time/timer.c:1774 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1787 __do_softirq+0x268/0x80c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x223/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1140 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+0x57/0x80 kernel/locking/spinlock.c:199 Code: 00 00 00 00 fc ff df 80 3c 08 00 74 0c 48 c7 c7 40 a0 2b 89 e8 aa ee a6 f9 48 83 3d 02 7c 21 01 00 74 25 fb 66 0f 1f 44 00 00 01 00 00 00 e8 5f 60 45 f9 65 8b 05 f4 f9 f7 77 85 c0 74 02 5b RSP: 0018:ffffc90001917788 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1257408 RBX: ffff8880ae937500 RCX: dffffc0000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff88803bcecda4 RBP: ffffc900019177e8 R08: ffffffff8178eca0 R09: ffffed1015d26ea1 R10: ffffed1015d26ea1 R11: 0000000000000000 R12: ffff8880ae937500 R13: ffff88803bcec540 R14: ffff8880ae937f08 R15: dffffc0000000000 finish_task_switch+0x24f/0x550 kernel/sched/core.c:3217 context_switch kernel/sched/core.c:3381 [inline] __schedule+0x80d/0xc90 kernel/sched/core.c:4094 preempt_schedule_irq+0xca/0x150 kernel/sched/core.c:4351 retint_kernel+0x1b/0x2b RIP: 0010:unmap_single_vma+0x12a/0x2d0 mm/memory.c:1290 Code: 5f 50 49 89 dc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df 41 80 3c 04 00 74 08 48 89 df e8 ee 8f 0f 00 48 89 5c 24 18 48 8b 1b 00 04 00 00 be 00 04 00 00 48 21 de 31 ff e8 b2 d3 d1 ff 48 21 RSP: 0018:ffffc90001917960 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 00000000180400fb RCX: ffff88803bcec540 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f17f943b000 R08: ffffffff81926c9d R09: ffffed1011e23e25 R10: ffffed1011e23e25 R11: 0000000000000000 R12: 1ffff1101123742b R13: 00007f17f943b000 R14: 00007f17f963b000 R15: ffff8880891ba108 unmap_vmas+0x15d/0x2c0 mm/memory.c:1344 exit_mmap+0x276/0x530 mm/mmap.c:3148 __mmput+0x113/0x350 kernel/fork.c:1085 exit_mm+0x4cd/0x550 kernel/exit.c:479 do_exit+0x56e/0x1f80 kernel/exit.c:782 do_group_exit+0x15e/0x2c0 kernel/exit.c:893 get_signal+0x13cf/0x1d60 kernel/signal.c:2739 do_signal+0x33/0x610 arch/x86/kernel/signal.c:784 exit_to_usermode_loop arch/x86/entry/common.c:161 [inline] prepare_exit_to_usermode+0x32a/0x600 arch/x86/entry/common.c:196 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c889 Code: 60 48 85 c9 74 1a 8b 54 24 24 85 d2 74 12 8b 5c 24 68 0f b7 0c 59 81 e1 ff 7f 00 00 39 d1 75 30 48 8b 4c 24 28 48 8b 54 24 40 <48> 8b 4c ca 08 48 03 48 10 48 8b 84 24 88 00 00 00 48 89 08 c6 84 RSP: 002b:00007f17f8818c78 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed RAX: 0000000000000000 RBX: 00007f17f88196d4 RCX: 000000000045c889 RDX: 0000000000000000 RSI: 0000000000c00000 RDI: 0000000020012000 RBP: 000000000076bfa0 R08: 0000000000000000 R09: 0002000000000002 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000727 R14: 00000000004c9f17 R15: 000000000076bfac