rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=b8bc/1/0x4000000000000000 softirq=574247/574247 fqs=0
rcu: 	(detected by 1, t=22041 jiffies, g=427953, q=258 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5049 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:unwind_next_frame+0xdc2/0x2550
Code: 00 00 00 00 fc ff df 41 80 7c 05 00 00 74 08 48 89 df e8 51 f8 b9 00 48 89 5c 24 60 4c 89 64 24 18 49 8d 5c 24 f8 4d 8b 66 10 <48> b8 00 00 00 00 00 fc ff df 48 8b 4c 24 20 0f b6 04 01 84 c0 0f
RSP: 0018:ffffc900000071b8 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffc90003427d10 RCX: ffffffff9049cf34
RDX: ffffffff90c5e852 RSI: 0000000000000002 RDI: ffffffff8c28ac00
RBP: 1ffff92000000e52 R08: 000000000000000a R09: ffffffff8e95cd60
R10: ffffc900000072d8 R11: ffffffff81b0f840 R12: ffffc90003428000
R13: 1ffff92000000e53 R14: ffffc90000007288 R15: ffffc90003420000
FS:  00007ff4bab66280(0000) GS:ffff88818dc90000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000016f4da000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000007000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_stack+0x3e/0x60
 kasan_record_aux_stack+0xbd/0xd0
 call_rcu+0xee/0x890
 __dev_queue_xmit+0x4e5/0x3950
 ip6_output+0x340/0x550
 ndisc_send_skb+0xd0b/0x1670
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x5e0
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x840
 __irq_exit_rcu+0xca/0x220
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_release+0x2d7/0x3c0
Code: 54 97 11 00 00 00 00 eb b5 e8 85 63 06 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 75 0e 97 11 48 3b 44 24 28 75 44 fb 48 83 c4 30 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 da 55 09 0a cc 48 8d 3d 02 10 92
RSP: 0018:ffffc90003427c08 EFLAGS: 00000282
RAX: daaac612f1abe000 RBX: 0000000000000202 RCX: 0000000000000046
RDX: 0000000000000003 RSI: ffffffff8e218a58 RDI: ffffffff8c28ac60
RBP: ffff88816f2d8c08 R08: ffffffff81c221b2 R09: ffffffff8e95cd60
R10: ffffc90003427e20 R11: fffff52000684fca R12: 0000000000000003
R13: 0000000000000003 R14: ffffffff8e95cd60 R15: ffff88816f2d8000
 auditd_test_task+0x22a/0x280
 audit_signal_info+0x72/0x1a0
 check_kill_permission+0x9e/0x520
 group_send_sig_info+0xea/0x260
 kill_pid_info_type+0xf8/0x1f0
 kill_proc_info+0xd9/0x180
 __se_sys_kill+0xd9/0x460
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff4ba686bf7
Code: bb 03 00 85 c0 74 0d 48 8b 15 2d a2 16 00 64 89 02 83 c8 ff 5a c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 b8 3e 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 01 a2 16 00 f7 d8 64 89 01 48
RSP: 002b:00007fffe5964b68 EFLAGS: 00000297 ORIG_RAX: 000000000000003e
RAX: ffffffffffffffda RBX: 00007fffe5964b78 RCX: 00007ff4ba686bf7
RDX: 0000000000000000 RSI: 000000000000000f RDI: 0000000000006892
RBP: 000000000000000b R08: 00000000ffffffff R09: 00007fffe5964b78
R10: 0000000000000008 R11: 0000000000000297 R12: 0000000000000bb8
R13: 0000000200000001 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 22040 jiffies! g427953 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=108108
rcu: rcu_preempt kthread starved for 22067 jiffies! g427953 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x200 ->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 stack:27536 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 27721 Comm: syz.0.11726 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:preempt_schedule_irq+0x48/0xa0
Code: 49 be 00 00 00 00 00 fc ff df eb 09 48 f7 03 10 00 00 00 74 53 bf 01 00 00 00 e8 e3 5b ea f5 e8 8e 6e 24 f6 fb bf 01 00 00 00 <e8> 13 a3 ff ff 9c 58 fa a9 00 02 00 00 74 05 e8 54 70 24 f6 bf 01
RSP: 0018:ffffc90004a074c0 EFLAGS: 00000206
RAX: 000000000040b355 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000007 RSI: ffffffff8dfa5c57 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff9030a7f7 R09: 1ffffffff20614fe
R10: dffffc0000000000 R11: fffffbfff20614ff R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007fe0564ba6c0(0000) GS:ffff8882a9290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001a3210000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000007000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 irqentry_exit+0x14f/0x730
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:vcpu_run+0x211d/0x7860
Code: 08 00 00 00 e8 24 47 e9 00 43 80 3c 3c 00 74 08 4c 89 f7 e8 a5 44 e9 00 49 8b 1e be 00 00 08 00 48 21 de 31 ff e8 03 0e 7e 00 <b8> 00 00 08 00 48 21 c3 75 07 e8 14 09 7e 00 eb 20 e8 0d 09 7e 00
RSP: 0018:ffffc90004a075e0 EFLAGS: 00000297
RAX: ffffffff8147c31d RBX: 0000000000004000 RCX: ffff88816c36ca00
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90004a079b0 R08: ffff8881b9b1803f R09: 1ffff11037363007
R10: dffffc0000000000 R11: ffffed1037363008 R12: 1ffff11037363007
R13: ffff8881b9b18000 R14: ffff8881b9b18038 R15: dffffc0000000000
 kvm_arch_vcpu_ioctl_run+0x11e6/0x20d0
 kvm_vcpu_ioctl+0xa62/0xfd0
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe05559cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe0564ba028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe055815fa0 RCX: 00007fe05559cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007fe055632d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe055816038 R14: 00007fe055815fa0 R15: 00007ffd5f38e3c8
 </TASK>
