rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=706/1/0x4000000000000000 softirq=166415/166583 fqs=4874 
	(t=10500 jiffies g=196261 q=403050)
NMI backtrace for cpu 0
CPU: 0 PID: 2836 Comm: syz-executor.0 Not tainted 5.10.0-rc6-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+0x107/0x163 lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:331
 print_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:637 [inline]
 rcu_pending kernel/rcu/tree.c:3694 [inline]
 rcu_sched_clock_irq.cold+0x472/0xee8 kernel/rcu/tree.c:2567
 update_process_times+0x77/0xd0 kernel/time/timer.c:1709
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:cmpxchg_double_slab mm/slub.c:401 [inline]
RIP: 0010:__slab_free+0xb0/0x560 mm/slub.c:3018
Code: 89 44 24 48 0f b6 44 24 4f 74 07 45 31 f6 84 c0 74 0e 45 31 f6 80 7c 24 48 00 0f 84 f5 00 00 00 41 f6 45 0b 40 48 8b 4c 24 78 <74> 43 48 83 7c 24 10 00 0f 85 6b 02 00 00 48 89 da 48 8b 7c 24 08
RSP: 0018:ffffc90000007bd0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 000000008017000f RCX: 000000008017000e
RDX: ffff8880239312d0 RSI: ffff888023931428 RDI: ffff888016589280
RBP: ffffc90000007c90 R08: 0000000000000001 R09: ffffffff876cf103
R10: 0000000000000000 R11: 0000000000000001 R12: 000000008017000e
R13: ffff888016589280 R14: 0000000000000000 R15: ffffea00008e4c00
 do_slab_free mm/slub.c:3130 [inline]
 slab_free mm/slub.c:3143 [inline]
 kmem_cache_free+0x302/0x350 mm/slub.c:3158
 inet_twsk_free+0x123/0x180 net/ipv4/inet_timewait_sock.c:73
 inet_twsk_put+0x78/0xa0 net/ipv4/inet_timewait_sock.c:80
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410
 expire_timers kernel/time/timer.c:1455 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747
 __run_timers kernel/time/timer.c:1728 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760
 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x132/0x200 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 4e 3b 6e f8 48 89 ef e8 d6 ef 6e f8 e8 31 d9 8d f8 fb bf 01 00 00 00 <e8> e6 5b 63 f8 65 8b 05 ef 05 1a 77 85 c0 74 02 5d c3 e8 8b 5b 18
RSP: 0018:ffffc9000bb1f588 EFLAGS: 00000206
RAX: 0000000000d1f6c5 RBX: ffff888091613480 RCX: 1ffffffff19d8e79
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8880b9e34940 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b9e34940
R13: ffff888011149a40 R14: 0000000000000000 R15: 0000000000000402
 finish_lock_switch kernel/sched/core.c:3518 [inline]
 finish_task_switch+0x150/0x7a0 kernel/sched/core.c:3618
 context_switch kernel/sched/core.c:3782 [inline]
 __schedule+0x89b/0x2130 kernel/sched/core.c:4528
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:4789
 irqentry_exit_cond_resched kernel/entry/common.c:357 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:349 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:387
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:196
Code: fc ff ff 48 c7 c7 00 d5 38 8b 48 89 54 24 08 48 89 34 24 e8 62 ac 5e 02 48 8b 54 24 08 48 8b 34 24 e9 a1 fd ff ff 0f 1f 40 00 <65> 48 8b 14 25 00 f0 01 00 65 8b 05 30 eb 91 7e a9 00 01 ff 00 48
RSP: 0018:ffffc9000bb1f790 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000027053067 RCX: ffffffff81a14150
RDX: 0000000000000000 RSI: ffff888091613480 RDI: 0000000000000007
RBP: 0000000027053067 R08: 0000000000000001 R09: ffffc9000bb1f890
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000027053
R13: 0000000000000930 R14: dffffc0000000000 R15: 0000000000000000
 pmd_pfn arch/x86/include/asm/pgtable.h:223 [inline]
 pte_lockptr include/linux/mm.h:2163 [inline]
 zap_pte_range mm/memory.c:1211 [inline]
 zap_pmd_range mm/memory.c:1357 [inline]
 zap_pud_range mm/memory.c:1386 [inline]
 zap_p4d_range mm/memory.c:1407 [inline]
 unmap_page_range+0x1614/0x2640 mm/memory.c:1428
 unmap_single_vma+0x198/0x300 mm/memory.c:1473
 unmap_vmas+0x168/0x2e0 mm/memory.c:1505
 exit_mmap+0x2b1/0x530 mm/mmap.c:3220
 __mmput+0x122/0x470 kernel/fork.c:1079
 mmput+0x53/0x60 kernel/fork.c:1100
 exit_mm kernel/exit.c:486 [inline]
 do_exit+0xa72/0x29b0 kernel/exit.c:796
 do_group_exit+0x125/0x310 kernel/exit.c:906
 get_signal+0x42a/0x1f10 kernel/signal.c:2758
 arch_do_signal+0x82/0x2390 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
 exit_to_user_mode_prepare+0x100/0x1a0 kernel/entry/common.c:191
 syscall_exit_to_user_mode+0x38/0x260 kernel/entry/common.c:266
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e0f9
Code: Unable to access opcode bytes at RIP 0x45e0cf.
RSP: 002b:00007f2d0f120c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: 0000000020ffc000 RBX: 0000000000000006 RCX: 000000000045e0f9
RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffc000
RBP: 000000000119c128 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 000000000119c0dc
R13: 00007ffd6129505f R14: 00007f2d0f1219c0 R15: 000000000119c0dc