rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=c64c/1/0x4000000000000000 softirq=23442/23442 fqs=3
rcu: 	(detected by 1, t=29986 jiffies, g=17377, q=16 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6617 Comm: syz.2.234 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+0x1b71/0x2550
Code: 4c 8b 7c 24 50 4c 8b 6c 24 20 41 0f b6 44 2d 00 84 c0 0f 85 81 02 00 00 41 c7 06 00 00 00 00 31 db e8 73 dd 30 0a 85 c0 74 3a <e8> 8a c9 33 00 84 c0 75 31 e8 61 dd 30 0a 85 c0 74 28 80 3d e4 71
RSP: 0018:ffffc90000006db8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff90c99101 RCX: ffff888106b32500
RDX: ffffc90000006e01 RSI: dffffc0000000000 RDI: ffffc90000006e90
RBP: dffffc0000000000 R08: ffffc90000007ef8 R09: 0000000000000000
R10: ffffc90000006ed8 R11: fffff52000000ddd R12: ffffc90000007f08
R13: ffffc90000000000 R14: ffffc90000006e88 R15: ffffffff8176e256
FS:  0000555561667500(0000) GS:ffff88818dc93000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 0000000110104000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000003 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x384/0x690
 __alloc_skb+0x27d/0x7d0
 __pskb_copy_fclone+0xa9/0x1120
 hsr_create_tagged_frame+0x24e/0xe10
 hsr_forward_skb+0x112b/0x2a80
 hsr_dev_xmit+0x242/0x360
 dev_hard_start_xmit+0x2cd/0x830
 __dev_queue_xmit+0x14d9/0x3950
 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:__slab_free+0xc3/0x2c0
Code: c0 74 41 45 31 e4 41 f6 46 0a 20 74 66 48 89 de 48 8b 5c 24 30 48 8b 4c 24 38 48 8b 44 24 40 48 8b 54 24 48 f0 48 0f c7 4e 20 <48> 89 f3 0f 84 e8 00 00 00 48 89 44 24 40 48 89 54 24 48 f3 90 e9
RSP: 0018:ffffc90004a37ae0 EFLAGS: 00000242
RAX: ffff888170064580 RBX: ffff888170064080 RCX: 0000000800200016
RDX: 0000000800200017 RSI: ffffea0005c01900 RDI: ffff8881000418c0
RBP: ffffc90004a37b68 R08: 0000000000000000 R09: ffffffff8230f91e
R10: dffffc0000000000 R11: fffffbfff206131f R12: 0000000000000000
R13: ffff888170064580 R14: ffff8881000418c0 R15: 0000000000000000
 qlist_free_all+0x99/0x100
 kasan_quarantine_reduce+0x148/0x160
 __kasan_slab_alloc+0x22/0x80
 __kmalloc_cache_noprof+0x2ba/0x660
 kvm_uevent_notify_change+0xc6/0x3a0
 kvm_put_kvm+0xaa/0xa50
 kvm_vm_release+0x43/0x50
 __fput+0x44f/0xa60
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xed/0x480
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7cdd39cdd9
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:00007ffcd12caab8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f7cdd617da0 RCX: 00007f7cdd39cdd9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f7cdd617da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f7cdd617cb0 R11: 0000000000000246 R12: 0000000000019da3
R13: 00007f7cdd615fac R14: 0000000000019aba R15: 00007ffcd12cabc0
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 29979 jiffies! g17377 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=4584
rcu: rcu_preempt kthread starved for 30016 jiffies! g17377 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: 6624 Comm: syz.0.236 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:vcpu_run+0x5a02/0x7860
Code: 4c 8b a4 24 28 01 00 00 4c 89 e3 48 c1 eb 03 42 0f b6 04 3b 84 c0 0f 85 1c 0b 00 00 41 c6 04 24 01 e8 92 db 85 00 fb 4c 89 f0 <48> c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 0b eb e8 00 49 ff 06
RSP: 0018:ffffc900064bf5e0 EFLAGS: 00000206
RAX: ffff8881105af0e0 RBX: 1ffff110220b5bf7 RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfa3d4e RDI: ffffffff8c28ab60
RBP: ffffc900064bf9b0 R08: ffffffff903098f7 R09: 1ffffffff206131e
R10: dffffc0000000000 R11: fffffbfff206131f R12: ffff8881105adfba
R13: ffff8881105ad380 R14: ffff8881105af0e0 R15: dffffc0000000000
FS:  00007f31ca13b6c0(0000) GS:ffff8882a9293000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 000000016c27e000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000003 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 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: 0033:0x7f31c919cdd9
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:00007f31ca13b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f31c9415fa0 RCX: 00007f31c919cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 00007f31c9232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f31c9416038 R14: 00007f31c9415fa0 R15: 00007ffd25de4198
 </TASK>
