rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (2 ticks this GP) idle=8444/1/0x4000000000000000 softirq=141407/141407 fqs=0
rcu: 	(detected by 1, t=29864 jiffies, g=109429, q=221 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 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:__lock_acquire+0x1821/0x2cf0
Code: 00 0f 83 8a 01 00 00 4e 8b 24 fd 40 c8 41 96 ff c0 25 ff 0f 00 00 89 05 1d 77 a0 14 4d 85 e4 0f 84 b2 01 00 00 49 8b 44 24 10 <48> 85 c0 0f 84 1c 0d 00 00 8b 0d 08 77 a0 14 39 48 5c 0f 84 67 ff
RSP: 0018:ffffc900001467a8 EFLAGS: 00000082
RAX: ffffffff93e2a900 RBX: 00000000000003fd RCX: ffffffff96d25238
RDX: ffffffff93e7f570 RSI: ffff888102ed31d0 RDI: 00000000000003fd
RBP: 78ce7d08c3861d94 R08: ffffc90000146770 R09: 0000000000000020
R10: 0000000000000003 R11: ffffffff81a22380 R12: ffffffff96d25238
R13: ffff888102ed31d0 R14: ffff888102ed2500 R15: 00000000000000ff
FS:  0000000000000000(0000) GS:ffff88818dc89000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001191ba000 CR4: 0000000000352ef0
DR0: 00000000000000e1 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 lock_acquire+0x106/0x350
 seqcount_lockdep_reader_access+0x55/0x100
 ktime_expiry_to_cycles+0x4e/0x1e0
 clockevents_program_event+0x199/0x630
 __hrtimer_rearm_deferred+0x270/0x450
 irqentry_exit+0x6d5/0x760
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:deref_stack_reg+0xa5/0x230
Code: 00 00 00 fc ff df 4c 89 74 24 08 4d 8b 77 10 4c 89 fd 48 c1 ed 03 0f b6 44 35 00 84 c0 0f 85 3c 01 00 00 41 83 3f 00 0f 95 c0 <4c> 39 c3 0f 96 c1 20 c1 4d 39 c6 0f 97 c0 20 c8 3c 01 75 18 49 8d
RSP: 0018:ffffc90000146c00 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffc90000140000 RCX: 0000000000000000
RDX: ffffc90000146d68 RSI: dffffc0000000000 RDI: ffffc90000146d28
RBP: 1ffff92000028da5 R08: ffffc90000147350 R09: 0000000000000000
R10: ffffc90000146d78 R11: fffff52000028db1 R12: 1ffff92000028da6
R13: 1ffff92000028da7 R14: ffffc90000148000 R15: ffffc90000146d28
 unwind_next_frame+0x19d5/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 kasan_save_free_info+0x46/0x50
 __kasan_slab_free+0x5c/0x80
 kfree+0x1c5/0x640
 skb_release_data+0x828/0xa60
 __kfree_skb+0x5d/0x210
 hsr_forward_skb+0x1bb9/0x2a80
 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
 run_ksoftirqd+0x36/0x60
 smpboot_thread_fn+0x541/0xa50
 kthread+0x389/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 29863 jiffies! g109429 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=25723
rcu: rcu_preempt kthread starved for 29864 jiffies! g109429 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+0x1821/0x5740
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x389/0x470
 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: 17641 Comm: syz.1.2866 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 62 ed 85 00 fb 4c 89 f0 <48> c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 db ff e8 00 49 ff 06
RSP: 0018:ffffc90002a9f5e0 EFLAGS: 00000206
RAX: ffff888119c7c720 RBX: 1ffff1102338f6bf RCX: 0000000080000001
RDX: 0000000000000006 RSI: ffffffff8dfac14f RDI: ffffffff8c28b660
RBP: ffffc90002a9f9b0 R08: ffffffff9030ccf7 R09: 1ffffffff206199e
R10: dffffc0000000000 R11: fffffbfff206199f R12: ffff888119c7b5fa
R13: ffff888119c7a9c0 R14: ffff888119c7c720 R15: dffffc0000000000
FS:  00007ff7852966c0(0000) GS:ffff8882a9289000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001191ba000 CR4: 0000000000352ef0
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: 0033:0x7ff78439ce59
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:00007ff785296028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff784615fa0 RCX: 00007ff78439ce59
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007ff784432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff784616038 R14: 00007ff784615fa0 R15: 00007fff3fc1dcd8
 </TASK>
