rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (7099 ticks this GP) idle=55a/1/0x4000000000000000 softirq=16540/16540 fqs=26 
	(t=10502 jiffies g=18097 q=853)
rcu: rcu_preempt kthread starved for 10451 jiffies! g18097 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:29272 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0x916/0x2410 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+0xd07/0x2280 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11576 Comm: syz-executor.5 Not tainted 5.12.0-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 f8 e7 43 00 e9 a1 fe ff ff 48 8b 3c 24 e8 ea e7 43 00 e9 18 fe ff ff cc cc cc cc cc 65 8b 05 e9 99 8d 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:ffffc900000075b8 EFLAGS: 00000046
RAX: 0000000000010103 RBX: dffffc0000000000 RCX: 000000533a67e52e
RDX: 0000000000000004 RSI: ffff88801e7e54c0 RDI: 0000000000000003
RBP: 000000533a67e52e R08: 7fffffffffffffff R09: 0000000000000000
R10: ffffffff816459b1 R11: 0000000000000000 R12: 0000000000000046
R13: 0000000000000000 R14: ffff8880b9c26340 R15: 7fffffffffffffff
FS:  00007fb0c10de700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000015512000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 write_comp_data kernel/kcov.c:218 [inline]
 __sanitizer_cov_trace_cmp8+0x1d/0x70 kernel/kcov.c:264
 ktime_compare include/linux/ktime.h:97 [inline]
 ktime_before include/linux/ktime.h:125 [inline]
 hrtimer_interrupt+0x2f1/0xa00 kernel/time/hrtimer.c:1657
 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+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197
Code: f0 4d 89 03 e9 f2 fc ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 40 00 <65> 8b 05 a9 91 8d 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc90000007760 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000100
RDX: 1ffff92000000f01 RSI: ffffffff87b9a8b9 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff87b9a8ac R11: 0000000000000000 R12: 0000000000000000
R13: ffffc90000007bc8 R14: 0000000000000003 R15: ffffc90000007808
 __rt6_find_exception_rcu+0x26d/0x340 net/ipv6/route.c:1559
 rt6_find_cached_rt+0x130/0x280 net/ipv6/route.c:1800
 ip6_pol_route+0x24b/0x11c0 net/ipv6/route.c:2220
 pol_lookup_func include/net/ip6_fib.h:579 [inline]
 fib6_rule_lookup+0x111/0x6f0 net/ipv6/fib6_rules.c:115
 ip6_route_input_lookup net/ipv6/route.c:2283 [inline]
 ip6_route_input+0x681/0xad0 net/ipv6/route.c:2452
 ip6_rcv_finish_core.constprop.0.isra.0+0x168/0x570 net/ipv6/ip6_input.c:63
 ip6_rcv_finish net/ipv6/ip6_input.c:74 [inline]
 NF_HOOK include/linux/netfilter.h:301 [inline]
 NF_HOOK include/linux/netfilter.h:295 [inline]
 ipv6_rcv+0x22b/0x3c0 net/ipv6/ip6_input.c:297
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5384
 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5498
 process_backlog+0x232/0x6c0 net/core/dev.c:6366
 __napi_poll+0xaf/0x440 net/core/dev.c:6913
 napi_poll net/core/dev.c:6980 [inline]
 net_rx_action+0x801/0xb40 net/core/dev.c:7067
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559
 invoke_softirq kernel/softirq.c:433 [inline]
 __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
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 fe c9 4e f8 48 89 ef e8 96 42 4f f8 e8 21 ff 6e f8 fb bf 01 00 00 00 <e8> 86 57 43 f8 65 8b 05 6f a1 f6 76 85 c0 74 02 5d c3 e8 cb f6 f4
RSP: 0018:ffffc9000184fa78 EFLAGS: 00000206
RAX: 00000000000002e1 RBX: 0000000000000002 RCX: 1ffffffff2037cda
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8880b9c351c0 R08: 0000000000000001 R09: ffffffff901b18c7
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880b9c351c0
R13: ffff8880188f9c40 R14: 0000000000000000 R15: ffff88801e7e54c0
 finish_lock_switch kernel/sched/core.c:4093 [inline]
 finish_task_switch.isra.0+0x15d/0x810 kernel/sched/core.c:4210
 context_switch kernel/sched/core.c:4342 [inline]
 __schedule+0x91e/0x2410 kernel/sched/core.c:5147
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5535
 irqentry_exit+0x31/0x80 kernel/entry/common.c:426
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:find_vma+0xe7/0x180 mm/mmap.c:2321
Code: 00 48 8b 5b 10 e8 39 8a ca ff 48 85 db 74 4c e8 2f 8a ca ff 48 8d 7b e8 48 89 f8 48 c1 e8 03 42 80 3c 30 00 75 60 4c 8b 6b e8 <48> 89 ee 4c 89 ef e8 4e 90 ca ff 49 39 ed 0f 87 79 ff ff ff e8 00
RSP: 0018:ffffc9000184fc88 EFLAGS: 00000246
RAX: 1ffff11003791ea6 RBX: ffff88801bc8f548 RCX: ffffc9001427a000
RDX: 0000000000040000 RSI: ffffffff81a9d3e1 RDI: ffff88801bc8f530
RBP: 0000000000000000 R08: 0000000000401000 R09: ffffffff901b18c7
R10: ffffffff81a9d3ae R11: 0000000000000000 R12: ffff88801bc8fa50
R13: 0000000000401000 R14: dffffc0000000000 R15: ffff888024723100
 do_user_addr_fault+0x2d7/0x1210 arch/x86/mm/fault.c:1351
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577
RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
RIP: 0010:strncpy_from_user+0x1dc/0x3e0 lib/strncpy_from_user.c:139
Code: ed 08 4d 89 74 1d 00 bf 07 00 00 00 48 83 c3 08 48 89 ee e8 46 3d 90 fd 48 83 fd 07 0f 86 bd 01 00 00 e8 17 35 90 fd 45 31 ff <4d> 8b 34 1c 31 ff 44 89 fe e8 b6 3c 90 fd 45 85 ff 0f 84 55 ff ff
RSP: 0018:ffffc9000184fe00 EFLAGS: 00050246
RAX: 0000000000000470 RBX: 0000000000000000 RCX: ffffc9001427a000
RDX: 0000000000040000 RSI: ffffffff83e428f9 RDI: 0000000000000003
RBP: 0000000000000020 R08: 0000000000000007 R09: ffffffff81c1403b
R10: ffffffff83e42859 R11: 0000000000000002 R12: 0000000000000000
R13: ffffc9000184fe78 R14: 0000000000000020 R15: 0000000000000000
 key_get_type_from_user security/keys/keyctl.c:51 [inline]
 keyctl_keyring_search+0x85/0x430 security/keys/keyctl.c:727
 __do_sys_keyctl+0x1f9/0x500 security/keys/keyctl.c:1905
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb0c10de188 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa
RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000a
RBP: 00000000004bfce1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000180 R11: 0000000000000246 R12: 000000000056c0b0
R13: 00007fff9ed0da6f R14: 00007fb0c10de300 R15: 0000000000022000
NMI backtrace for cpu 1
CPU: 1 PID: 11560 Comm: syz-executor.5 Not tainted 5.12.0-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+0x141/0x1d7 lib/dump_stack.c:120
 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/0x3e0 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+0x3f1/0x74b 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:1373
 __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+0x146/0x540 arch/x86/kernel/apic/apic.c:1106
 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:197
Code: ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 40 00 65 8b 05 a9 91 8d 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9
RSP: 0000:ffffc90000dc0cc8 EFLAGS: 00000212
RAX: 0000000000000101 RBX: 0000000000b69ebb RCX: 0000000000b69ebb
RDX: 0000000000000000 RSI: ffff8880788dd4c0 RDI: 0000000000000003
RBP: 0000000000011500 R08: 00000206eb41f0da R09: 0000000000000001
R10: ffffffff8164dbac R11: 0000000000000000 R12: ffffffffff496144
R13: dffffc0000000000 R14: ffffffff8bf97308 R15: 00000206eb41f0da
 timekeeping_delta_to_ns kernel/time/timekeeping.c:376 [inline]
 timekeeping_get_ns kernel/time/timekeeping.c:387 [inline]
 ktime_get_with_offset+0x31a/0x500 kernel/time/timekeeping.c:872
 ktime_get_real include/linux/timekeeping.h:78 [inline]
 mac80211_hwsim_get_tsf_raw drivers/net/wireless/mac80211_hwsim.c:976 [inline]
 mac80211_hwsim_beacon_tx+0x2e8/0x910 drivers/net/wireless/mac80211_hwsim.c:1814
 __iterate_interfaces+0x1e5/0x520 net/mac80211/util.c:793
 ieee80211_iterate_active_interfaces_atomic+0x8d/0x170 net/mac80211/util.c:829
 mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1852
 __run_hrtimer kernel/time/hrtimer.c:1537 [inline]
 __hrtimer_run_queues+0x609/0xe40 kernel/time/hrtimer.c:1601
 hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1618
 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559
 invoke_softirq kernel/softirq.c:433 [inline]
 __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:5535
Code: 55 53 65 48 8b 1c 25 00 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 32 95 44 f8 e8 1d 2b 70 f8 fb bf 01 00 00 00 <e8> 62 ce ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 70 83 44
RSP: 0000:ffffc900016afe68 EFLAGS: 00000202
RAX: 0000000000006cc7 RBX: ffff8880788dd4c0 RCX: 1ffffffff1b8d4e1
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed100f11ba98 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817a4d98 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit+0x31/0x80 kernel/entry/common.c:426
 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:658
RIP: 0010:exit_to_user_mode_loop kernel/entry/common.c:161 [inline]
RIP: 0010:exit_to_user_mode_prepare+0x137/0x280 kernel/entry/common.c:208
Code: f6 c4 02 0f 85 0f 01 00 00 65 48 8b 04 25 00 f0 01 00 48 8b 18 f7 c3 0e 30 02 00 0f 84 0a ff ff ff e8 cd 9e 17 00 fb f6 c3 08 <74> bf e8 22 66 a7 07 f6 c7 10 74 ba 48 89 ef e8 25 fa 32 00 f7 c3
RSP: 0000:ffffc900016aff30 EFLAGS: 00000202
RAX: 0000000000006cc5 RBX: 0000000000000008 RCX: 1ffffffff1b8d4e1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900016aff58 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817a4d98 R11: 0000000000000001 R12: ffff8880788dd4c0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 irqentry_exit_to_user_mode+0x5/0x40 kernel/entry/common.c:314
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632
RIP: 0033:0x4032f8
Code: 20 c7 44 24 0c 30 00 00 00 48 89 44 24 18 e8 af ee 01 00 48 8b 3d 00 42 14 00 e8 63 5f 02 00 44 89 23 48 81 c4 d0 00 00 00 5b <5d> 41 5c c3 0f 1f 40 00 0f b6 02 83 e0 60 74 40 3c 40 75 13 0f b6
RSP: 002b:00007fb0c1120188 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004c1031
RDX: 000000000000dd82 RSI: 000000000000654b RDI: 00000000004bf54e
RBP: 00000000004bf54e R08: 0000000000000000 R09: 000000000000000e
R10: 000000000000c2ce R11: 0000000000000246 R12: 000000000056bf60
R13: 00007fff9ed0da6f R14: 00007fb0c1120300 R15: 0000000000022000