rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=a8e/1/0x4000000000000004 softirq=334333/334334 fqs=5199 
	(t=10500 jiffies g=350301 q=217335)
NMI backtrace for cpu 0
CPU: 0 PID: 7110 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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:lock_acquire+0x1c7/0x480 kernel/locking/lockdep.c:4937
Code: c1 e8 03 80 3c 10 00 74 0c 48 c7 c7 70 b9 2b 89 e8 5e c0 58 00 48 83 3d c6 38 d3 07 00 0f 84 8e 02 00 00 48 8b 7c 24 20 57 9d <0f> 1f 44 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 58 0f 85 70
RSP: 0018:ffffc90000007c40 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff125772e RBX: 1ffff11014e6bda0 RCX: ffffffff81596a64
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286
RBP: 0000000000000000 R08: dffffc0000000000 R09: fffffbfff1628eb6
R10: fffffbfff1628eb6 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffff8880a735ed04 R15: ffff8880a48c8498
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:353 [inline]
 inet_twsk_kill+0xca/0x5a0 net/ipv4/inet_timewait_sock.c:50
 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
 </IRQ>
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:207 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x4/0x80 kernel/kcov.c:281
Code: c1 e0 03 48 83 c8 18 49 89 14 02 4d 89 44 f2 18 49 ff c1 4d 89 0a c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 4c 8b 04 24 <65> 48 8b 14 25 40 1e 02 00 65 8b 05 78 b6 8e 7e a9 00 01 1f 00 75
RSP: 0018:ffffc90007fe76c8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 1ffffd4000264ed9 RBX: dead000000000100 RCX: ffff8880a735e440
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000000ef R08: ffffffff81aa75d5 R09: fffff94000264ed1
R10: fffff94000264ed1 R11: 0000000000000000 R12: dffffc0000000000
R13: ffffea00013276c0 R14: dffffc0000000000 R15: 00000000000001fe
 compound_head include/linux/page-flags.h:184 [inline]
 PageSwapCache include/linux/page-flags.h:391 [inline]
 free_swap_cache+0x55/0x2b0 mm/swap_state.c:267
 free_pages_and_swap_cache+0x5e/0x90 mm/swap_state.c:295
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
 tlb_flush_mmu+0x780/0x910 mm/mmu_gather.c:249
 zap_pte_range+0x1a13/0x1c10 mm/memory.c:1158
 zap_pmd_range mm/memory.c:1196 [inline]
 zap_pud_range mm/memory.c:1225 [inline]
 zap_p4d_range mm/memory.c:1246 [inline]
 unmap_page_range+0x9a0/0xb00 mm/memory.c:1267
 unmap_vmas+0x15d/0x2c0 mm/memory.c:1344
 exit_mmap+0x276/0x530 mm/mmap.c:3150
 __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:2735
 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
 ret_from_intr+0x26/0x2b
RIP: 0033:0x45c835
Code: 24 30 48 89 4c 24 48 48 89 44 24 50 48 8b 4c 24 48 48 8b 54 24 78 48 39 c2 74 12 c6 84 24 90 00 00 00 00 48 8b 6c 24 58 48 83 <c4> 60 c3 48 8b 44 24 70 48 89 04 24 48 89 4c 24 08 48 89 54 24 10
RSP: 002b:00007f34b1bb4c78 EFLAGS: 00000217 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 00000000004dbc80 RCX: 000000000045c829
RDX: 0000000000042000 RSI: 0000000000000004 RDI: 0000000000000006
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000000c7 R14: 00000000004c353a R15: 00007f34b1bb56d4