------------[ cut here ]------------ dst_release underflow WARNING: CPU: 1 PID: 90 at net/core/dst.c:173 dst_release net/core/dst.c:173 [inline] WARNING: CPU: 1 PID: 90 at net/core/dst.c:173 dst_release+0xd2/0xe0 net/core/dst.c:167 Modules linked in: CPU: 1 PID: 90 Comm: kworker/u4:3 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:dst_release net/core/dst.c:173 [inline] RIP: 0010:dst_release+0xd2/0xe0 net/core/dst.c:167 Code: 89 c3 89 c6 e8 8f 71 3d fa 85 db 74 a4 e9 17 bd 13 02 e8 61 6f 3d fa 48 c7 c7 40 fa ad 8a c6 05 82 ec 42 06 01 e8 d8 57 d4 01 <0f> 0b eb c6 66 2e 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 55 48 RSP: 0018:ffffc90001a9f9e8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888017ec1d00 RSI: ffffffff815f0ad8 RDI: fffff52000353f2f RBP: ffffe8ffffcdec80 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815ea87e R11: 0000000000000000 R12: ffffe8ffffcdec88 R13: 00000000ffffffff R14: 0000000000000007 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f60787429e0 CR3: 0000000018fe0000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dst_cache_destroy net/core/dst_cache.c:160 [inline] dst_cache_destroy+0xcb/0x190 net/core/dst_cache.c:152 ip_tunnel_dev_free+0x21/0x60 net/ipv4/ip_tunnel.c:1011 netdev_run_todo+0x6b4/0xa80 net/core/dev.c:9946 ip_tunnel_delete_nets+0x3a4/0x5b0 net/ipv4/ip_tunnel.c:1124 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295