------------[ cut here ]------------
dst_release underflow
WARNING: CPU: 0 PID: 577 at net/core/dst.c:173 dst_release+0xd8/0xe0 net/core/dst.c:173
Modules linked in:
CPU: 0 PID: 577 Comm: syz-executor.1 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:dst_release+0xd8/0xe0 net/core/dst.c:173
Code: 4c 89 f2 89 d9 31 c0 5b 41 5e 5d e9 2a 32 45 f9 e8 6d ec 5f f9 c6 05 9d be c6 05 01 48 c7 c7 40 3b 99 8b 31 c0 e8 68 c5 29 f9 <0f> 0b eb 85 0f 1f 40 00 53 48 89 fb e8 47 ec 5f f9 48 83 c3 a8 48
RSP: 0018:ffffc9000414f720 EFLAGS: 00010246
RAX: 115bbb65883b3400 RBX: 00000000ffffffff RCX: 0000000000040000
RDX: ffffc9000b7a0000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 0000000000000000 R08: ffffffff8169fe02 R09: ffffed1017344f2c
R10: ffffed1017344f2c R11: 0000000000000000 R12: 0000607f4623fc80
R13: 1ffffffff1bfd20d R14: ffff88801a8d3400 R15: dffffc0000000000
FS:  00007f6f96bc2700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555557023708 CR3: 000000009a66d000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000010 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 dst_cache_destroy+0x107/0x1e0 net/core/dst_cache.c:160
 ipip6_dev_free net/ipv6/sit.c:1414 [inline]
 sit_init_net+0x229/0x550 net/ipv6/sit.c:1936
 ops_init+0x313/0x430 net/core/net_namespace.c:140
 setup_net+0x35b/0x9d0 net/core/net_namespace.c:326
 copy_net_ns+0x359/0x5c0 net/core/net_namespace.c:470
 create_new_namespaces+0x4ce/0xa00 kernel/nsproxy.c:110
 copy_namespaces+0x333/0x390 kernel/nsproxy.c:178
 copy_process+0x2968/0x5ca0 kernel/fork.c:2194
 kernel_clone+0x22a/0x7e0 kernel/fork.c:2582
 __do_sys_clone kernel/fork.c:2699 [inline]
 __se_sys_clone kernel/fork.c:2683 [inline]
 __x64_sys_clone+0x245/0x2b0 kernel/fork.c:2683
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f6f9964cae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6f96bc2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f6f9975ff60 RCX: 00007f6f9964cae9
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 000000004c20a70a
RBP: 00007f6f996a6f6d R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffea28ecb9f R14: 00007f6f96bc2300 R15: 0000000000022000
 </TASK>