------------[ cut here ]------------
!rcu_read_lock_held()
WARNING: ./include/net/dst.h:326 at skb_dst_force include/net/dst.h:326 [inline], CPU#1: syz.8.8171/5726
WARNING: ./include/net/dst.h:326 at xfrm_output_one net/xfrm/xfrm_output.c:549 [inline], CPU#1: syz.8.8171/5726
WARNING: ./include/net/dst.h:326 at xfrm_output_resume+0x41d9/0x64e0 net/xfrm/xfrm_output.c:597, CPU#1: syz.8.8171/5726
Modules linked in:
CPU: 1 UID: 0 PID: 5726 Comm: syz.8.8171 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 20 fb 53 8d e8 40 fb 06 f7 e9 aa fc ff ff e8 96 a9 2b f7 90 0f 0b 90 e9 7e ed ff ff e8 88 a9 2b f7 90 <0f> 0b 90 e9 44 e0 ff ff 48 89 df e8 87 05 52 fa 84 c0 0f 84 e1 00
RSP: 0018:ffffc90000a088c0 EFLAGS: 00010246
RAX: ffffffff8a9d67e8 RBX: 0000000000000000 RCX: ffff88804d1cbe80
RDX: 0000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffffc90000a08b50 R08: 0000000000000100 R09: 1ffffffff237bfb7
R10: dffffc0000000000 R11: fffffbfff237bfb8 R12: dffffc0000000000
R13: ffff888059db37d8 R14: ffff888055683210 R15: ffff8880275adb00
FS:  000055555dbaa500(0000) GS:ffff888123509000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001bc0 CR3: 0000000075388000 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 kernel/softirq.c:703 [inline]
 invoke_softirq kernel/softirq.c:542 [inline]
 __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:809
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x232/0x350 kernel/locking/lockdep.c:5947
Code: ff ff ff e8 30 ce 61 0a f7 44 24 10 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 32 58 3d 13 48 3b 44 24 50 75 33 fb 48 83 c4 58 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 4f e1 64 0a cc 48 8d 3d 07 20 1d
RSP: 0018:ffffc90007297118 EFLAGS: 00000286
RAX: c0f5b5f0c2c34200 RBX: 0000000000000001 RCX: 0000000000000046
RDX: 00000000ed8ae75a RSI: ffffffff8e934d46 RDI: ffffffff8c8ea180
RBP: ffff88804d1cbe80 R08: ffffffff822f9fe4 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed100743c551 R12: ffff88802bdcbcd0
R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000246
 down_read+0x45/0x320 kernel/locking/rwsem.c:1574
 anon_vma_lock_read mm/internal.h:315 [inline]
 validate_mm+0x1e4/0x4c0 mm/vma.c:714
 vms_complete_munmap_vmas+0x93b/0xc10 mm/vma.c:1461
 __mmap_complete mm/vma.c:2805 [inline]
 __mmap_region mm/vma.c:3100 [inline]
 mmap_region+0x1693/0x2800 mm/vma.c:3173
 do_mmap+0xe0a/0x1300 mm/mmap.c:573
 vm_mmap_pgoff+0x27a/0x520 mm/util.c:581
 ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619
 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: 0033:0x7f8bad3a9242
Code: 81 01 00 0f 1f 44 00 00 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 3b 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 6e 5b 5d c3 0f 1f 00 48 c7 c0 e8 ff ff ff 64
RSP: 002b:00007fff82191e98 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f8baadf4000 RCX: 00007f8bad3a9242
RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007f8baadf4000
RBP: 0000000000000011 R08: 00000000000000dc R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000206 R12: 0000000000000003
R13: 0000000000000002 R14: 0000000000000000 R15: 00007f8bad625fa0
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	ff                   	ljmp   (bad)
   1:	e8 30 ce 61 0a       	call   0xa61ce36
   6:	f7 44 24 10 00 02 00 	testl  $0x200,0x10(%rsp)
   d:	00
   e:	0f 84 38 ff ff ff    	je     0xffffff4c
  14:	65 48 8b 05 32 58 3d 	mov    %gs:0x133d5832(%rip),%rax        # 0x133d584e
  1b:	13
  1c:	48 3b 44 24 50       	cmp    0x50(%rsp),%rax
  21:	75 33                	jne    0x56
  23:	fb                   	sti
  24:	48 83 c4 58          	add    $0x58,%rsp
* 28:	5b                   	pop    %rbx <-- trapping instruction
  29:	41 5c                	pop    %r12
  2b:	41 5d                	pop    %r13
  2d:	41 5e                	pop    %r14
  2f:	41 5f                	pop    %r15
  31:	5d                   	pop    %rbp
  32:	e9 4f e1 64 0a       	jmp    0xa64e186
  37:	cc                   	int3
  38:	48                   	rex.W
  39:	8d                   	.byte 0x8d
  3a:	3d                   	.byte 0x3d
  3b:	07                   	(bad)
  3c:	20                   	.byte 0x20
  3d:	1d                   	.byte 0x1d