------------[ cut here ]------------
WARNING: CPU: 0 PID: 4620 at net/xfrm/xfrm_state.c:3303 xfrm_state_fini+0xd4/0x15c net/xfrm/xfrm_state.c:3303
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 0 UID: 0 PID: 4620 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)
 r7:00000000 r6:8281f77c r5:00000000 r4:82260d04
[<80201b08>] (show_stack) from [<8021fc50>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201b08>] (show_stack) from [<8021fc50>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021fbfc>] (dump_stack_lvl) from [<8021fc90>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a77d18
[<8021fc78>] (dump_stack) from [<80202624>] (vpanic+0x10c/0x30c kernel/panic.c:430)
[<80202518>] (vpanic) from [<80202858>] (trace_suspend_resume+0x0/0xd8 kernel/panic.c:566)
 r7:81801674
[<80202824>] (panic) from [<80254960>] (check_panic_on_warn kernel/panic.c:323 [inline])
[<80202824>] (panic) from [<80254960>] (get_taint+0x0/0x1c kernel/panic.c:318)
 r3:8280c684 r2:00000001 r1:82247720 r0:8224f19c
[<802548e8>] (check_panic_on_warn) from [<80254ac4>] (__warn+0x80/0x188 kernel/panic.c:837)
[<80254a44>] (__warn) from [<80254d44>] (warn_slowpath_fmt+0x178/0x1f4 kernel/panic.c:864)
 r8:00000009 r7:8243ee48 r6:dfb35dd4 r5:841d3c00 r4:00000000
[<80254bd0>] (warn_slowpath_fmt) from [<81801674>] (xfrm_state_fini+0xd4/0x15c net/xfrm/xfrm_state.c:3303)
 r10:00000001 r9:00000001 r8:829dd028 r7:829eee90 r6:829dd028 r5:855a0ec0
 r4:855a0ec0
[<818015a0>] (xfrm_state_fini) from [<817f2820>] (xfrm_net_exit+0x2c/0x40 net/xfrm/xfrm_policy.c:4348)
 r5:855a0ec0 r4:855a0ec0
[<817f27f4>] (xfrm_net_exit) from [<81564f60>] (ops_exit_list net/core/net_namespace.c:198 [inline])
[<817f27f4>] (xfrm_net_exit) from [<81564f60>] (ops_undo_list+0xe8/0x238 net/core/net_namespace.c:251)
 r5:855a0ec0 r4:dfb35e98
[<81564e78>] (ops_undo_list) from [<81567124>] (cleanup_net+0x20c/0x384 net/core/net_namespace.c:682)
 r10:00000000 r9:ffffffd4 r8:855a49c0 r7:829dd00c r6:829dcfe4 r5:82c1e640
 r4:855a0ee0
[<81566f18>] (cleanup_net) from [<8027a398>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3236)
 r10:8300f270 r9:8301c615 r8:841d3c00 r7:8300e600 r6:8301c600 r5:829dcffc
 r4:8603eb00
[<8027a1e4>] (process_one_work) from [<8027afe0>] (process_scheduled_works kernel/workqueue.c:3319 [inline])
[<8027a1e4>] (process_one_work) from [<8027afe0>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3400)
 r10:61c88647 r9:841d3c00 r8:8603eb2c r7:82804d40 r6:8300e600 r5:8300e620
 r4:8603eb00
[<8027ade4>] (worker_thread) from [<80281fcc>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:8603eb00 r8:8027ade4 r7:ec1b1e60 r6:8603eb80 r5:841d3c00
 r4:00000001
[<80281ea0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfb35fb0 to 0xdfb35ff8)
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 r5:80281ea0
 r4:8606ffc0
Rebooting in 86400 seconds..