------------[ cut here ]------------
WARNING: CPU: 1 PID: 9000 at net/ipv6/xfrm6_tunnel.c:341 xfrm6_tunnel_net_exit+0xa4/0x170 net/ipv6/xfrm6_tunnel.c:341
Modules linked in:
CPU: 1 UID: 0 PID: 9000 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT 
Hardware name: riscv-virtio,qemu (DT)
Workqueue: netns cleanup_net
epc : xfrm6_tunnel_net_exit+0xa4/0x170 net/ipv6/xfrm6_tunnel.c:341
 ra : xfrm6_tunnel_net_exit+0xa4/0x170 net/ipv6/xfrm6_tunnel.c:341
epc : ffffffff85e108dc ra : ffffffff85e108dc sp : ffff8f800d6877f0
 gp : ffffffff89e99e80 tp : ffffaf8012318000 t0 : 0000000000000001
 t1 : fffffffef223aa05 t2 : 0000000000000008 s0 : ffff8f800d687830
 s1 : ffffaf8019608000 a0 : 0000000000000000 a1 : ffffaf8012319000
 a2 : 0000000000000000 a3 : ffffffff817db0d6 a4 : 0000000000000002
 a5 : 0000000000000000 a6 : fffffffef223aa06 a7 : ffffffff911d502b
 s2 : 0000000000000000 s3 : ffffaf8019608000 s4 : ffffaf8019608000
 s5 : 0000000000000100 s6 : dfffffff00000000 s7 : fffffffef138c924
 s8 : ffffffff89a71040 s9 : ffffffff877e5a40 s10: ffffffff89c64920
 s11: fffff1ef01ad0f34 t3 : 9601f9e700000000 t4 : fffffffef223aa05
 t5 : fffffffef223aa06 t6 : 0000000000000002
status: 0000000200000120 badaddr: ffffffff85e108dc cause: 0000000000000003
[<ffffffff85e108dc>] xfrm6_tunnel_net_exit+0xa4/0x170 net/ipv6/xfrm6_tunnel.c:341
[<ffffffff85197bc0>] ops_exit_list net/core/net_namespace.c:198 [inline]
[<ffffffff85197bc0>] ops_undo_list+0x262/0x9dc net/core/net_namespace.c:251
[<ffffffff8519cf9e>] cleanup_net+0x3ee/0x7ec net/core/net_namespace.c:682
[<ffffffff801cf50c>] process_one_work+0x842/0x1ea4 kernel/workqueue.c:3236
[<ffffffff801d1bb8>] process_scheduled_works kernel/workqueue.c:3319 [inline]
[<ffffffff801d1bb8>] worker_thread+0x5d2/0xdec kernel/workqueue.c:3400
[<ffffffff801ec406>] kthread+0x3a4/0x7e0 kernel/kthread.c:463
[<ffffffff8006a9c4>] ret_from_fork_kernel+0x2a/0xbb4 arch/riscv/kernel/process.c:214
[<ffffffff86432ece>] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:328