rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1):
(detected by 0, t=10503 jiffies, g=438561, q=40)
rcu: All QSes seen, last rcu_preempt kthread activity 10494 (4295207378-4295196884), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10495 jiffies! g438561 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:28864 pid: 14 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4681 [inline]
__schedule+0x93a/0x26f0 kernel/sched/core.c:5938
schedule+0xd3/0x270 kernel/sched/core.c:6017
schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
rcu_gp_fqs_loop kernel/rcu/tree.c:1996 [inline]
rcu_gp_kthread+0xd34/0x1980 kernel/rcu/tree.c:2169
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:
NMI backtrace for cpu 0
CPU: 0 PID: 27089 Comm: syz-executor.3 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
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_check_gp_kthread_starvation.cold+0x1d1/0x1d6 kernel/rcu/tree_stall.h:479
print_other_cpu_stall kernel/rcu/tree_stall.h:584 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:709 [inline]
rcu_pending kernel/rcu/tree.c:3922 [inline]
rcu_sched_clock_irq+0x2001/0x20c0 kernel/rcu/tree.c:2641
update_process_times+0x16d/0x200 kernel/time/timer.c:1785
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+0x1c0/0xe50 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+0x40/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x7/0x60 kernel/kcov.c:197
Code: fd 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 00 65 8b 05 09 47 8c 7e <89> c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 40 f0 01 00 a9
RSP: 0018:ffffc90000007d80 EFLAGS: 00000246
RAX: 0000000000000101 RBX: ffff88802cb44c40 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff888066ca3880 RDI: 0000000000000003
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff888841aa
R10: ffffffff88884213 R11: 0000000000000001 R12: ffff88802cb45fa0
R13: 0000000000000000 R14: ffff888016b5a7d8 R15: 0000000000000002
__iterate_interfaces+0x121/0x520 net/mac80211/util.c:786
ieee80211_iterate_active_interfaces_atomic+0x70/0x180 net/mac80211/util.c:829
mac80211_hwsim_beacon+0xd5/0x1a0 drivers/net/wireless/mac80211_hwsim.c:1861
__run_hrtimer kernel/time/hrtimer.c:1537 [inline]
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1601
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1618
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x16e/0x1c0 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:preempt_schedule_irq+0x49/0x90 kernel/sched/core.c:6326
Code: 55 53 65 48 8b 1c 25 40 f0 01 00 48 89 dd 48 c1 ed 03 48 01 c5 bf 01 00 00 00 e8 02 80 23 f8 e8 1d cc 4f f8 fb bf 01 00 00 00 d2 cd ff ff 9c 58 fa f6 c4 02 75 27 bf 01 00 00 00 e8 10 6f 23
RSP: 0018:ffffc90002d2edc8 EFLAGS: 00000206
RAX: 00000000000051bd RBX: ffff888066ca3880 RCX: 1ffffffff1fa4042
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffed100cd94710 R08: 0000000000000001 R09: ffffffff8fcd59a7
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
irqentry_exit+0x31/0x80 kernel/entry/common.c:427
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:lock_is_held_type+0xfd/0x140 kernel/locking/lockdep.c:5673
Code: 00 00 b8 ff ff ff ff 65 0f c1 05 9e 80 d7 76 83 f8 01 75 29 9c 58 f6 c4 02 75 3d 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 ed eb b9 0f 0b 48
RSP: 0018:ffffc90002d2ee98 EFLAGS: 00000282
RAX: 0000000000000046 RBX: 0000000000000001 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffffff8b97c280 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff87d798d1 R11: 0000000000000000 R12: ffff888066ca3880
R13: 0000000000000001 R14: 00000000ffffffff R15: ffff888066ca4298
fib6_node_lookup_1+0x245/0x910 net/ipv6/ip6_fib.c:1609
fib6_node_lookup+0xbe/0x170 net/ipv6/ip6_fib.c:1638
fib6_table_lookup+0xb7/0xa20 net/ipv6/route.c:2175
ip6_pol_route+0x1c5/0x11d0 net/ipv6/route.c:2218
pol_lookup_func include/net/ip6_fib.h:579 [inline]
fib6_rule_lookup+0x111/0x6f0 net/ipv6/fib6_rules.c:115
ip6_route_output_flags_noref+0x2e2/0x380 net/ipv6/route.c:2626
ip6_route_output_flags+0x72/0x320 net/ipv6/route.c:2639
ip6_dst_lookup_tail+0xa13/0x1620 net/ipv6/ip6_output.c:1120
ip6_dst_lookup_flow+0x8c/0x1d0 net/ipv6/ip6_output.c:1223
sctp_v6_get_dst+0x107e/0x1d60 net/sctp/ipv6.c:385
sctp_transport_route+0x125/0x350 net/sctp/transport.c:457
sctp_assoc_add_peer+0x6e6/0x14b0 net/sctp/associola.c:665
sctp_connect_new_asoc+0x1fc/0x770 net/sctp/socket.c:1096
sctp_sendmsg_new_asoc net/sctp/socket.c:1690 [inline]
sctp_sendmsg+0x13bc/0x1d30 net/sctp/socket.c:2000
inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821
sock_sendmsg_nosec net/socket.c:703 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:723
____sys_sendmsg+0x6e8/0x810 net/socket.c:2394
___sys_sendmsg+0xf3/0x170 net/socket.c:2448
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2477
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
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:00007f45439ea188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 00000000040420c4 RSI: 00000000200001c0 RDI: 0000000000000004
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffcde483c8f R14: 00007f45439ea300 R15: 0000000000022000
----------------
Code disassembly (best guess), 3 bytes skipped:
0: b9 ff ff ff ff mov $0xffffffff,%ecx
5: ba 08 00 00 00 mov $0x8,%edx
a: 4d 8b 03 mov (%r11),%r8
d: 48 0f bd ca bsr %rdx,%rcx
11: 49 8b 45 00 mov 0x0(%r13),%rax
15: 48 63 c9 movslq %ecx,%rcx
18: e9 64 ff ff ff jmpq 0xffffff81
1d: 0f 1f 00 nopl (%rax)
20: 65 8b 05 09 47 8c 7e mov %gs:0x7e8c4709(%rip),%eax # 0x7e8c4730
* 27: 89 c1 mov %eax,%ecx <-- trapping instruction
29: 48 8b 34 24 mov (%rsp),%rsi
2d: 81 e1 00 01 00 00 and $0x100,%ecx
33: 65 48 8b 14 25 40 f0 mov %gs:0x1f040,%rdx
3a: 01 00
3c: a9 .byte 0xa9