rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=174741, q=5)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295058460-4295047958), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g174741 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:29032 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x23e0 kernel/sched/core.c:5147
 schedule+0xcf/0x270 kernel/sched/core.c:5226
 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1892
 rcu_gp_fqs_loop kernel/rcu/tree.c:2004 [inline]
 rcu_gp_kthread+0xd07/0x2300 kernel/rcu/tree.c:2177
 kthread+0x3b1/0x4a0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2921 Comm: syz-executor.3 Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lock_is_held_type+0x0/0x140 kernel/locking/lockdep.c:5540
Code: 2e b3 b2 04 85 c0 75 e6 48 c7 c6 00 9d 6b 89 48 c7 c7 40 9d 6b 89 89 44 24 04 e8 00 7d be ff 0f 0b 8b 44 24 04 e9 08 ff ff ff <41> 57 41 56 41 55 41 bd ff ff ff ff 41 54 55 53 48 83 ec 08 8b 0d
RSP: 0018:ffffc90000dd8db8 EFLAGS: 00000046
RAX: 0000000000010001 RBX: ffff888012bbf340 RCX: 0000000000000000
RDX: ffff888077876100 RSI: 00000000ffffffff RDI: ffff888012bbf300
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff873e7797 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88802f773700 R14: ffff8880b9d26380 R15: ffffffff873e76c0
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8d2bc943f8 CR3: 000000006ccd1000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_is_held include/linux/lockdep.h:283 [inline]
 advance_sched+0x638/0x990 net/sched/sch_taprio.c:747
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x609/0xe40 kernel/time/hrtimer.c:1601
 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x69/0x70 kernel/kcov.c:293
Code: 3c cd 28 00 00 00 48 39 fe 72 1f 48 83 c2 01 4c 89 44 38 e8 48 c7 44 38 e0 07 00 00 00 48 89 4c 38 f0 4e 89 54 c8 20 48 89 10 <c3> 66 0f 1f 44 00 00 41 89 f8 bf 03 00 00 00 4c 8b 14 24 89 f1 65
RSP: 0018:ffffc900161176c0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff888077876100 RDI: 0000000000000003
RBP: ffffea00019e3900 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81b149ba R11: 0000000000000000 R12: ffffea00019e3900
R13: ffffea00019e3908 R14: dead000000000100 R15: ffffc90016117a78
 compound_head include/linux/page-flags.h:186 [inline]
 PageSwapCache include/linux/page-flags.h:399 [inline]
 free_swap_cache+0x4a/0x300 mm/swap_state.c:296
 free_pages_and_swap_cache+0x58/0x90 mm/swap_state.c:324
 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
 tlb_flush_mmu+0xe9/0x6b0 mm/mmu_gather.c:249
 zap_pte_range mm/memory.c:1336 [inline]
 zap_pmd_range mm/memory.c:1385 [inline]
 zap_pud_range mm/memory.c:1414 [inline]
 zap_p4d_range mm/memory.c:1435 [inline]
 unmap_page_range+0x1b7e/0x2890 mm/memory.c:1456
 unmap_single_vma+0x198/0x300 mm/memory.c:1501
 unmap_vmas+0x16d/0x2f0 mm/memory.c:1533
 exit_mmap+0x2a8/0x590 mm/mmap.c:3208
 __mmput+0x122/0x470 kernel/fork.c:1096
 mmput+0x58/0x60 kernel/fork.c:1117
 exit_mm kernel/exit.c:502 [inline]
 do_exit+0xb0a/0x2a60 kernel/exit.c:813
 do_group_exit+0x125/0x310 kernel/exit.c:923
 get_signal+0x47f/0x2150 kernel/signal.c:2835
 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x180/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: Unable to access opcode bytes at RIP 0x4665af.
RSP: 002b:00007f24961dd218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 000000000056bf88 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88
RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c
R13: 00007ffd14a993cf R14: 00007f24961dd300 R15: 0000000000022000