rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (0 ticks this GP) idle=d904/1/0x4000000000000000 softirq=597043/597043 fqs=0
rcu: 	(detected by 1, t=13975 jiffies, g=444957, q=91 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5345 Comm: dhcpcd 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:debug_lockdep_rcu_enabled+0x2c/0x40
Code: 1e fa 31 c0 83 3d 63 4e 88 04 00 74 1d 83 3d 1a 80 88 04 00 74 14 65 48 8b 0d 58 a5 90 07 31 c0 83 b9 8c 0b 00 00 00 0f 94 c0 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90
RSP: 0018:ffffc900000072b0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffffffff819503f7 RCX: ffff8881113a8000
RDX: 0000000082b5193f RSI: ffffffff8e218a58 RDI: ffffffff8c28ac60
RBP: dffffc0000000000 R08: ffffffff81770256 R09: ffffffff8e95cd60
R10: ffffc900000073d8 R11: ffffffff81b0f840 R12: ffffc900000073c0
R13: 1ffff92000000e71 R14: ffffc90000007388 R15: ffffffff81770256
FS:  00007f01ecde2740(0000) GS:ffff88818dc90000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000110121000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000007 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 unwind_next_frame+0xcc/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x31c/0x660
 ref_tracker_alloc+0x15a/0x4c0
 dst_init+0xd9/0x480
 dst_alloc+0x12a/0x170
 icmp6_dst_alloc+0x75/0x440
 ndisc_send_skb+0x44a/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:finish_task_switch+0x427/0xbe0
Code: 41 c7 84 24 e0 0d 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 a6 fa 15 0a e8 b1 f3 38 00 fb 49 8d bd a8 16 00 00 <48> 89 f8 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 7b 03 00 00 41 80
RSP: 0018:ffffc900039473f0 EFLAGS: 00000206
RAX: 00000000001f0c93 RBX: 1ffff11024207784 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8dfa5c57 RDI: ffff8881113a96a8
RBP: ffffc90003947450 R08: ffffffff9030a7f7 R09: 1ffffffff20614fe
R10: dffffc0000000000 R11: fffffbfff20614ff R12: ffff88812103ae88
R13: ffff8881113a8000 R14: ffff8881108d8000 R15: dffffc0000000000
 __schedule+0x17bc/0x5680
 schedule+0x164/0x360
 schedule_hrtimeout_range_clock+0x1f2/0x330
 poll_schedule_timeout+0xd0/0x1a0
 do_sys_poll+0x7eb/0x10e0
 __se_sys_ppoll+0x209/0x2b0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f01eceafad5
Code: 85 d2 74 0d 0f 10 02 48 8d 54 24 20 0f 11 44 24 20 64 8b 04 25 18 00 00 00 85 c0 75 27 41 b8 08 00 00 00 b8 0f 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 75 48 8b 15 24 73 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe18f2c740 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: ffffffffffffffda RBX: 00005575f3be0dc0 RCX: 00007f01eceafad5
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 00005575f3be0da0
RBP: 00007ffe18f2ca90 R08: 0000000000000008 R09: 00007ffe18f1c5f8
R10: 00007ffe18f2ca90 R11: 0000000000000246 R12: 0000000000000000
R13: 00005575e17e4610 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
task:dhcpcd          state:R  running task     stack:24472 pid:5344  tgid:5344  ppid:1      task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x17b4/0x5680
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x730
 asm_common_interrupt+0x26/0x40
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:ffffc90003937060 EFLAGS: 00000286
RAX: e443d43f7d673e00 RBX: 0000000000000202 RCX: 0000000000000046
RDX: 0000000000000000 RSI: ffffffff8e218a58 RDI: ffffffff8c28ac60
RBP: ffff8881108d8b90 R08: ffffc90003937c10 R09: 0000000000000000
R10: ffffc900039371b8 R11: fffff52000726e39 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8e95cd60 R15: ffff8881108d8000
 unwind_next_frame+0x1bba/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_node_track_caller_noprof+0x4db/0x7b0
 __alloc_skb+0x2c1/0x7d0
 alloc_skb_with_frags+0xc8/0x760
 sock_alloc_send_pskb+0x878/0x990
 unix_dgram_sendmsg+0x460/0x18d0
 sock_write_iter+0x49b/0x4f0
 do_iter_readv_writev+0x619/0x8c0
 vfs_writev+0x33c/0x990
 do_writev+0x154/0x2e0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f01eceb0e03
RSP: 002b:00007ffe18f2c4e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007ffe18f2c848 RCX: 00007f01eceb0e03
RDX: 0000000000000005 RSI: 00007ffe18f2c500 RDI: 000000000000000a
RBP: 000000000000012c R08: 000000000000000a R09: 00007ffe18f2c540
R10: 00007ffe18f2c548 R11: 0000000000000246 R12: 00005575f3bea710
R13: 00005575e17b4f88 R14: 00000000ffffffff R15: 0000000000000001
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 13974 jiffies! g444957 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=109648
rcu: rcu_preempt kthread starved for 13975 jiffies! g444957 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: 30067 Comm: syz.1.12619 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 a2 fb 85 00 fb 4c 89 f0 <48> c1 e8 03 42 80 3c 38 00 74 08 4c 89 f7 e8 9b 0b e9 00 49 ff 06
RSP: 0018:ffffc90003a675e0 EFLAGS: 00000206
RAX: ffff88816e934720 RBX: 1ffff1102dd266bf RCX: 0000000000000001
RDX: 0000000000000006 RSI: ffffffff8dfa5c57 RDI: ffffffff8c28ac60
RBP: ffffc90003a679b0 R08: ffffffff9030a7f7 R09: 1ffffffff20614fe
R10: dffffc0000000000 R11: fffffbfff20614ff R12: ffff88816e9335fa
R13: ffff88816e9329c0 R14: ffff88816e934720 R15: dffffc0000000000
FS:  00007f869c0c36c0(0000) GS:ffff8882a9290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000010a579000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000007 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: 0033:0x7f869b19cdd9
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:00007f869c0c3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f869b415fa0 RCX: 00007f869b19cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f869b232d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f869b416038 R14: 00007f869b415fa0 R15: 00007ffd6277acf8
 </TASK>
