rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (9479 ticks this GP) idle=09dc/1/0x4000000000000000 softirq=286239/286245 fqs=434
rcu: 	(t=10500 jiffies g=295437 q=1700 ncpus=2)
rcu: rcu_preempt kthread starved for 9601 jiffies! g295437 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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  running task     stack:27432 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_timeout+0x158/0x2c0
 rcu_gp_fqs_loop+0x312/0x11d0
 rcu_gp_kthread+0x9e/0x2b0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5553 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:native_queued_spin_lock_slowpath+0xb5/0x960
Code: 0c 04 04 c7 44 24 60 00 00 00 00 0f 1f 44 00 00 4c 8d 74 24 60 49 89 df 49 c1 ef 03 41 bd 01 00 00 00 eb 06 89 44 24 60 f3 90 <48> 89 df be 04 00 00 00 e8 4e 50 7f f6 48 b8 00 00 00 00 00 fc ff
RSP: 0018:ffffc90003cb7620 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff8e91d440 RCX: ffffffff8bb09b72
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff8e91d440
RBP: ffffc90003cb7710 R08: ffffffff8e91d443 R09: 1ffffffff1d23a88
R10: dffffc0000000000 R11: fffffbfff1d23a89 R12: 1ffff92000796ecc
R13: 0000000000000001 R14: ffffc90003cb7680 R15: 1ffffffff1d23a88
FS:  00007f64efd0f740(0000) GS:ffff8882a9463000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000556c58a83028 CR3: 00000001738d2000 CR4: 00000000000006f0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 do_raw_spin_lock+0x26c/0x2f0
 proc_sys_permission+0xbe/0x500
 inode_permission+0x46f/0x5f0
 link_path_walk+0xaad/0x18d0
 path_openat+0x2c3/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f64efdd99a4
Code: 24 20 48 8d 44 24 30 48 89 44 24 28 64 8b 04 25 18 00 00 00 85 c0 75 2c 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 60 48 8b 15 55 a4 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffe75b65880 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f64efd0f6c0 RCX: 00007f64efdd99a4
RDX: 0000000000000241 RSI: 00007ffe75b75b18 RDI: 00000000ffffff9c
RBP: 00007ffe75b75b18 R08: 0000000000000000 R09: 00007ffe75b75a88
R10: 00000000000001b4 R11: 0000000000000246 R12: 0000000000000241
R13: 00007ffe75b75b3f R14: 0000000000000003 R15: 00000000000001b4
 </TASK>
CPU: 0 UID: 0 PID: 31411 Comm: syz.1.17118 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:kasan_check_range+0x81/0x2c0
Code: ff df 4f 8d 1c 17 49 ff c8 4d 89 c1 49 c1 e9 03 48 bb 01 00 00 00 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 <4d> 85 e4 0f 84 3d 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00
RSP: 0018:ffffc900000072a0 EFLAGS: 00000283
RAX: 0000000000000001 RBX: dffffc0000000001 RCX: ffffffff81a0d6d2
RDX: 0000000000000000 RSI: 000000000000000d RDI: ffffffff8bce0080
RBP: ffffc90000007400 R08: ffffffff8bce008c R09: 1ffffffff179c011
R10: dffffc0000000000 R11: fffffbfff179c010 R12: 0000000000000002
R13: 000000000000000e R14: fffffbfff179c012 R15: 1ffffffff179c010
FS:  00007f025cb976c0(0000) GS:ffff88818de63000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9604b13ff8 CR3: 0000000116caa000 CR4: 00000000000006f0
DR0: 0010000010000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000090602
Call Trace:
 <IRQ>
 __asan_memcpy+0x29/0x70
 perf_trace_lock+0x2b2/0x410
 lock_release+0x392/0x3d0
 unwind_next_frame+0x1aaa/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 kasan_save_track+0x3e/0x80
 __kasan_kmalloc+0x93/0xb0
 __kmalloc_cache_noprof+0x31c/0x660
 dst_cow_metrics_generic+0x56/0x1c0
 icmp6_dst_alloc+0x265/0x440
 ndisc_send_skb+0x44a/0x1670
 addrconf_rs_timer+0x395/0x6d0
 call_timer_fn+0x192/0x640
 __run_timer_base+0x652/0x8b0
 run_timer_softirq+0xb7/0x170
 handle_softirqs+0x22a/0x870
 __irq_exit_rcu+0x5f/0x150
 irq_exit_rcu+0x9/0x30
 sysvec_apic_timer_interrupt+0xa6/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x5c/0x70
Code: 70 16 00 00 83 fa 02 75 21 48 8b 91 78 16 00 00 48 8b 32 48 8d 7e 01 8b 89 74 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 <e9> 8f 3a eb 09 cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc90003d874a8 EFLAGS: 00000283
RAX: ffffffff826dfb45 RBX: ffff88802d0c3058 RCX: 0000000000080000
RDX: ffffc900248cc000 RSI: 000000000006a914 RDI: 000000000006a915
RBP: ffffffff8ce83540 R08: 0000000000000000 R09: 0000000000000000
R10: ffff88802d0c3060 R11: ffffed1005a1860e R12: 000000000000000d
R13: 0000000000000007 R14: 0000000000000007 R15: ffff888112f96058
 insert_header+0xbd5/0x1220
 __register_sysctl_table+0x11da/0x1340
 __devinet_sysctl_register+0x386/0x490
 devinet_init_net+0x390/0x7c0
 ops_init+0x35c/0x5c0
 setup_net+0x118/0x340
 copy_net_ns+0x50e/0x730
 create_new_namespaces+0x3e7/0x6a0
 copy_namespaces+0x438/0x4b0
 copy_process+0x18e2/0x3cf0
 kernel_clone+0x248/0x8e0
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f025bd9c799
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:00007f025cb96fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f025c015fa0 RCX: 00007f025bd9c799
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000630c1000
RBP: 00007f025be32c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f025c016038 R14: 00007f025c015fa0 R15: 00007ffeda502408
 </TASK>
