------------[ cut here ]------------
WARNING: CPU: 0 PID: 16327 at net/xfrm/xfrm_state.
WARNING: CPU: 0 PID: 16327 at net/xfrm/xfrm_state.c:3306 xfrm_state_fini+0xd4/0x15c net/xfrm/xfrm_state.c:3306
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 0 UID: 0 PID: 16327 Comm: kworker/u8:0 Not tainted syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Workqueue: netns cleanup_net
Call trace: 
[<80201a24>] (dump_backtrace) from [<80201b20>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:822406c0 r6:85a80000 r5:00000000 r4:822523c8
[<80201b08>] (show_stack) from [<8021f920>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201b08>] (show_stack) from [<8021f920>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021f8cc>] (dump_stack_lvl) from [<8021f960>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a78d18
[<8021f948>] (dump_stack) from [<802025f8>] (vpanic+0xe0/0x2e8 kernel/panic.c:489)
[<80202518>] (vpanic) from [<80202834>] (trace_suspend_resume+0x0/0xd8 kernel/panic.c:626)
 r7:818203d0
[<80202800>] (panic) from [<80252948>] (check_panic_on_warn kernel/panic.c:376 [inline])
[<80202800>] (panic) from [<80252948>] (get_taint+0x0/0x1c kernel/panic.c:371)
 r3:8280c684 r2:00000001 r1:82238c24 r0:822406c0
[<802528d0>] (check_panic_on_warn) from [<80252aac>] (__warn+0x80/0x188 kernel/panic.c:897)
[<80252a2c>] (__warn) from [<80252d2c>] (warn_slowpath_fmt+0x178/0x1f4 kernel/panic.c:924)
 r8:00000009 r7:8242ed74 r6:eb865dd4 r5:85a80000 r4:00000000
[<80252bb8>] (warn_slowpath_fmt) from [<818203d0>] (xfrm_state_fini+0xd4/0x15c net/xfrm/xfrm_state.c:3306)
 r10:00000001 r9:00000001 r8:829de39c r7:829f0410 r6:829de39c r5:8556e900
 r4:8556e900
[<818202fc>] (xfrm_state_fini) from [<81812840>] (xfrm_net_exit+0x2c/0x40 net/xfrm/xfrm_policy.c:4354)
 r5:8556e900 r4:8556e900
[<81812814>] (xfrm_net_exit) from [<815770d8>] (ops_exit_list net/core/net_namespace.c:199 [inline])
[<81812814>] (xfrm_net_exit) from [<815770d8>] (ops_undo_list+0xe8/0x238 net/core/net_namespace.c:252)
 r5:8556e900 r4:eb865e98
[<81576ff0>] (ops_undo_list) from [<81579270>] (cleanup_net+0x220/0x3a0 net/core/net_namespace.c:695)
 r10:00000000 r9:ffffffd4 r8:8556da00 r7:829de380 r6:829de358 r5:82c2c240
 r4:8556e920
[<81579050>] (cleanup_net) from [<802785a0>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3263)
 r10:8300f470 r9:8301c815 r8:85a80000 r7:8300e600 r6:8301c800 r5:829de370
 r4:861ade00
[<802783ec>] (process_one_work) from [<802791e8>] (process_scheduled_works kernel/workqueue.c:3346 [inline])
[<802783ec>] (process_one_work) from [<802791e8>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3427)
 r10:61c88647 r9:85a80000 r8:861ade2c r7:82804d40 r6:8300e600 r5:8300e620
 r4:861ade00
[<80278fec>] (worker_thread) from [<8028020c>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:861ade00 r8:80278fec r7:df9f9e60 r6:85228380 r5:85a80000
 r4:00000001
[<802800e0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xeb865fb0 to 0xeb865ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802800e0
 r4:85912c00
Rebooting in 86400 seconds..