------------[ cut here ]------------
!rcu_read_lock_held()
WARNING: ./include/net/dst.h:326 at skb_dst_force include/net/dst.h:326 [inline], CPU#0: syz.3.2926/17271
WARNING: ./include/net/dst.h:326 at xfrm_output_one net/xfrm/xfrm_output.c:549 [inline], CPU#0: syz.3.2926/17271
WARNING: ./include/net/dst.h:326 at xfrm_output_resume+0x41d9/0x64e0 net/xfrm/xfrm_output.c:597, CPU#0: syz.3.2926/17271
Modules linked in:
CPU: 0 UID: 0 PID: 17271 Comm: syz.3.2926 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:skb_dst_force include/net/dst.h:326 [inline]
RIP: 0010:xfrm_output_one net/xfrm/xfrm_output.c:549 [inline]
RIP: 0010:xfrm_output_resume+0x41d9/0x64e0 net/xfrm/xfrm_output.c:597
Code: be b5 01 00 00 48 c7 c2 c0 fa 53 8d e8 40 1b 07 f7 e9 aa fc ff ff e8 96 c9 2b f7 90 0f 0b 90 e9 7e ed ff ff e8 88 c9 2b f7 90 <0f> 0b 90 e9 44 e0 ff ff 48 89 df e8 87 25 52 fa 84 c0 0f 84 e1 00
RSP: 0018:ffffc90000007900 EFLAGS: 00010246
RAX: ffffffff8a9d47e8 RBX: 0000000000000000 RCX: ffff888030723e80
RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffffc90000007b90 R08: 0000000000000100 R09: 1ffffffff237bf97
R10: dffffc0000000000 R11: fffffbfff237bf98 R12: dffffc0000000000
R13: ffff888083834cd8 R14: ffff888051d06550 R15: ffff88807e644f00
FS:  00007f1d7ea2e6c0(0000) GS:ffff888123409000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b35121ff8 CR3: 0000000033b26000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 iptfs_output_queued net/xfrm/xfrm_iptfs.c:2325 [inline]
 iptfs_delay_timer+0x3803/0x4310 net/xfrm/xfrm_iptfs.c:2362
 __run_hrtimer kernel/time/hrtimer.c:2079 [inline]
 __hrtimer_run_queues+0x3bc/0xa10 kernel/time/hrtimer.c:2136
 hrtimer_run_softirq+0x1e3/0x2e0 kernel/time/hrtimer.c:2153
 handle_softirqs+0x265/0x8d0 kernel/softirq.c:669
 do_softirq+0x77/0xd0 kernel/softirq.c:569
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 pppol2tp_sendmsg+0x419/0x610 net/l2tp/l2tp_ppp.c:304
 sock_sendmsg_nosec+0x14e/0x190 net/socket.c:800
 __sock_sendmsg net/socket.c:818 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2715
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2769
 __sys_sendmsg net/socket.c:2801 [inline]
 __do_sys_sendmsg net/socket.c:2806 [inline]
 __se_sys_sendmsg net/socket.c:2804 [inline]
 __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2804
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1d7dba8f19
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1d7ea2e028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f1d7de25fa0 RCX: 00007f1d7dba8f19
RDX: 0000000000000801 RSI: 0000200000000380 RDI: 0000000000000003
RBP: 00007f1d7dc37f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1d7de26038 R14: 00007f1d7de25fa0 R15: 00007ffc4c1e73a8
 </TASK>