rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=d8a4/1/0x4000000000000000 softirq=25745/25745 fqs=0
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5435/2:b..l
rcu: 	(detected by 1, t=29933 jiffies, g=17445, q=252 ncpus=2)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5617 Comm: syz-executor 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+0x110/0x2cf0
Code: 40 01 00 00 44 8b a4 24 30 01 00 00 89 d5 48 c7 c1 70 03 e2 93 48 29 c8 48 c1 f8 03 48 be 29 5c 8f c2 f5 28 5c 8f 48 0f af f0 <85> db 0f 85 52 01 00 00 85 ed 0f 84 4a 01 00 00 83 fd 31 0f 83 09
RSP: 0018:ffffc900000070d0 EFLAGS: 00000803
RAX: 00000000000000af RBX: 0000000000000000 RCX: ffffffff93e20370
RDX: 0000000000000003 RSI: 0000000000000007 RDI: ffffffff8e95cd60
RBP: 0000000000000003 R08: 0000000000000000 R09: ffffffff8e95cd60
R10: ffffc900000073d8 R11: ffffffff81b0ebd0 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
FS:  0000555571552500(0000) GS:ffff88818dc8d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000176f02000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000004800
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x106/0x350
 unwind_next_frame+0xc3/0x2550
 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:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 3d e7 f6 f5 f7 c3 00 02 00 00 74 05 e8 30 7d 22 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 14 68 e8 f5 65 8b 05 0d c0 8d 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0018:ffffc9000460fd78 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000286 RCX: 0000000000000002
RDX: 0000000000000007 RSI: ffffffff8dfa6762 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffffffff9030b6f7 R09: 1ffffffff20616de
R10: dffffc0000000000 R11: fffffbfff20616df R12: ffffffff818a07fd
R13: 0000000000000000 R14: ffff888113121bc0 R15: 0000000000000009
 group_send_sig_info+0x233/0x260
 __se_sys_kill+0x38f/0x460
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f082eb3e367
Code: 48 83 c4 08 c3 66 0f 1f 44 00 00 48 c7 c2 e8 ff ff ff 64 89 02 b8 ff ff ff ff eb e4 0f 1f 80 00 00 00 00 b8 3e 00 00 00 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:00007ffebc5e61e8 EFLAGS: 00000293 ORIG_RAX: 000000000000003e
RAX: ffffffffffffffda RBX: 0000000000000144 RCX: 00007f082eb3e367
RDX: 00000000000003dd RSI: 0000000000000009 RDI: 00000000fffffebc
RBP: 00007ffebc5e622c R08: 000000003aff82f4 R09: 0000000000000000
R10: 4000000000000000 R11: 0000000000000293 R12: 0000000000000054
R13: 0000000000000064 R14: 0000000000017f8a R15: 00007ffebc5e6280
 </TASK>
task:kworker/u8:2    state:R  running task     stack:23736 pid:5435  tgid:5435  ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: bat_events batadv_mcast_mla_update
Call Trace:
 <TASK>
 __schedule+0x1821/0x5740
 preempt_schedule_irq+0x4d/0xa0
 irqentry_exit+0x14f/0x760
 asm_sysvec_call_function_single+0x1a/0x20
RIP: 0010:lock_acquire+0x58/0x350
Code: 8b 05 ac 7e 97 11 48 89 44 24 58 0f 1f 44 00 00 65 8b 05 af 7e 97 11 83 f8 08 0f 83 83 01 00 00 89 c0 48 0f a3 05 58 05 8f 0e <73> 0d e8 11 28 09 00 84 c0 0f 84 ca 01 00 00 83 3d 12 38 8f 0e 00
RSP: 0000:ffffc90002a2f358 EFLAGS: 00000297
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e95cd60
RBP: ffffffff8176f256 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc90002a2f518 R11: ffffffff81b0ebd0 R12: 0000000000000002
R13: ffffffff8e95cd60 R14: 0000000000000000 R15: 0000000000000000
 unwind_next_frame+0xc3/0x2550
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x31c/0x660
 batadv_mcast_mla_update+0x190a/0x3740
 process_scheduled_works+0xb5d/0x1860
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 29932 jiffies! g17445 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=4056
rcu: rcu_preempt kthread starved for 29933 jiffies! g17445 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->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:I stack:27544 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+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: 6731 Comm: syz.1.254 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:vmx_read_guest_seg_base+0x384/0x580
Code: 48 8d 9b 24 b1 c4 8b 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 84 c0 0f 85 82 01 00 00 8b 1b 41 0f 78 de <0f> 86 d4 01 00 00 e8 b1 ec 69 00 4c 89 f8 48 c1 e8 03 48 b9 00 00
RSP: 0018:ffffc90008926e70 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000006808 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff888114e68297 R09: 1ffff110229cd052
R10: dffffc0000000000 R11: ffffed10229cd053 R12: ffff888114e6a340
R13: 1ffff110229cd468 R14: 0000000000000000 R15: ffff888114e6a368
FS:  00007f082f9e16c0(0000) GS:ffff8882a928d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001203a9000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __do_insn_fetch_bytes+0x38f/0x700
 x86_decode_insn+0x38e/0x5df0
 x86_emulate_instruction+0x64a/0x2100
 kvm_mmu_page_fault+0x91a/0xb70
 vmx_handle_exit+0xd70/0x16f0
 vcpu_run+0x5c77/0x7860
 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: 0033:0x7f082eb9cdd9
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:00007f082f9e1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f082ee15fa0 RCX: 00007f082eb9cdd9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007f082ec32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f082ee16038 R14: 00007f082ee15fa0 R15: 00007ffebc5e5e88
 </TASK>
