rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=d82/1/0x4000000000000000 softirq=115380/115382 fqs=5 
	(t=10500 jiffies g=220833 q=19502)
rcu: rcu_preempt kthread timer wakeup didn't happen for 3322 jiffies! g220833 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=77211
rcu: rcu_preempt kthread starved for 3323 jiffies! g220833 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:28816 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4683 [inline]
 __schedule+0x934/0x2710 kernel/sched/core.c:5940
 schedule+0xd3/0x270 kernel/sched/core.c:6019
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1892
 rcu_gp_fqs_loop kernel/rcu/tree.c:2004 [inline]
 rcu_gp_kthread+0xd1a/0x2300 kernel/rcu/tree.c:2177
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
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: 21604 Comm: syz-executor.0 Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:check_kcov_mode+0x7/0x40 kernel/kcov.c:163
Code: fe ff ff 48 89 df e8 18 c6 45 00 e9 a1 fe ff ff 48 8b 3c 24 e8 0a c6 45 00 e9 18 fe ff ff cc cc cc cc cc 65 8b 05 d9 6d 8c 7e <89> c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b
RSP: 0018:ffffc9001dcdf740 EFLAGS: 00000246
RAX: 0000000080000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 1ffffd400036ef11 RSI: ffff88807bfa54c0 RDI: 0000000000000003
RBP: ffffea0001b77880 R08: 0000000000000000 R09: ffffea0001b77887
R10: ffffffff81af01b5 R11: 0000000000000000 R12: ffffea0001b77888
R13: 0000000000000000 R14: 0000000000000000 R15: 00007f56a932c000
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c011035360 CR3: 0000000020d2d000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 write_comp_data kernel/kcov.c:218 [inline]
 __sanitizer_cov_trace_const_cmp8+0x1d/0x70 kernel/kcov.c:291
 _compound_head include/linux/page-flags.h:187 [inline]
 PageAnon include/linux/page-flags.h:492 [inline]
 page_remove_rmap+0x55/0x1480 mm/rmap.c:1347
 zap_pte_range mm/memory.c:1269 [inline]
 zap_pmd_range mm/memory.c:1384 [inline]
 zap_pud_range mm/memory.c:1413 [inline]
 zap_p4d_range mm/memory.c:1434 [inline]
 unmap_page_range+0xeab/0x2890 mm/memory.c:1455
 unmap_single_vma+0x198/0x300 mm/memory.c:1500
 unmap_vmas+0x16d/0x2f0 mm/memory.c:1532
 exit_mmap+0x1d0/0x620 mm/mmap.c:3202
 __mmput+0x122/0x470 kernel/fork.c:1101
 mmput+0x58/0x60 kernel/fork.c:1122
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xae2/0x2a50 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2150 kernel/signal.c:2796
 arch_do_signal_or_restart+0x2a9/0x1eb0 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+0x17d/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+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: Unable to access opcode bytes at RIP 0x4665af.
RSP: 002b:00007f56a8928218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000056bf88 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88
RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c
R13: 0000000000a9fb1f R14: 00007f56a8928300 R15: 0000000000022000
NMI backtrace for cpu 0
CPU: 0 PID: 21884 Comm: syz-executor.4 Not tainted 5.13.0-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:79 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:96
 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+0x25e/0x3f0 kernel/rcu/tree_stall.h:341
 print_cpu_stall kernel/rcu/tree_stall.h:624 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:699 [inline]
 rcu_pending kernel/rcu/tree.c:3911 [inline]
 rcu_sched_clock_irq.cold+0x9f/0x747 kernel/rcu/tree.c:2649
 update_process_times+0x16d/0x200 kernel/time/timer.c:1796
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 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+0x146/0x530 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:638
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:197
Code: 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 34 15 00 00 85 c0 74 2b 8b 82 10 15 00 00 <83> f8 02 75 20 48 8b 8a 18 15 00 00 8b 92 14 15 00 00 48 8b 01 48
RSP: 0018:ffffc9001dc2f6e0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffea0001cf4e40 RCX: 0000000000000000
RDX: ffff888164aa54c0 RSI: ffffffff81b3c902 RDI: 0000000000000003
RBP: ffffea0001cf4e40 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff81b3c8f4 R11: 0000000000000000 R12: ffffea0001cf4e40
R13: ffffea0001cf4e48 R14: 0000000000000000 R15: 0000000000000000
 PagePoisoned include/linux/page-flags.h:207 [inline]
 PageSwapBacked include/linux/page-flags.h:360 [inline]
 PageSwapCache include/linux/page-flags.h:404 [inline]
 free_swap_cache+0xa2/0x310 mm/swap_state.c:291
 free_pages_and_swap_cache+0x58/0x90 mm/swap_state.c:319
 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:1335 [inline]
 zap_pmd_range mm/memory.c:1384 [inline]
 zap_pud_range mm/memory.c:1413 [inline]
 zap_p4d_range mm/memory.c:1434 [inline]
 unmap_page_range+0x1b86/0x2890 mm/memory.c:1455
 unmap_single_vma+0x198/0x300 mm/memory.c:1500
 unmap_vmas+0x16d/0x2f0 mm/memory.c:1532
 exit_mmap+0x1d0/0x620 mm/mmap.c:3202
 __mmput+0x122/0x470 kernel/fork.c:1101
 mmput+0x58/0x60 kernel/fork.c:1122
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xae2/0x2a50 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 get_signal+0x47f/0x2150 kernel/signal.c:2796
 arch_do_signal_or_restart+0x2a9/0x1eb0 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+0x17d/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+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: Unable to access opcode bytes at RIP 0x4665af.
RSP: 002b:00007f96785f0218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000056bf88 RCX: 00000000004665d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf88
RBP: 000000000056bf80 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf8c
R13: 0000000000a9fb1f R14: 00007f96785f0300 R15: 0000000000022000