RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000080000500
RDX: 000000000000001c RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
------------[ cut here ]------------
1
WARNING: net/sched/act_ct.c:437 at tcf_ct_flow_table_add net/sched/act_ct.c:437 [inline], CPU#0: syz.3.1665/10828
WARNING: net/sched/act_ct.c:437 at tcf_ct_flow_table_process_conn+0x449/0x7c0 net/sched/act_ct.c:513, CPU#0: syz.3.1665/10828
Modules linked in:
CPU: 0 UID: 0 PID: 10828 Comm: syz.3.1665 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:tcf_ct_flow_table_add net/sched/act_ct.c:437 [inline]
RIP: 0010:tcf_ct_flow_table_process_conn+0x449/0x7c0 net/sched/act_ct.c:513
Code: 85 81 02 00 00 41 0f b7 2f 31 ff 89 ee e8 af dd e9 f7 85 ed 0f 84 7c 01 00 00 e8 62 d9 e9 f7 e9 e0 01 00 00 e8 58 d9 e9 f7 90 <0f> 0b 90 e9 b2 01 00 00 e8 4a d9 e9 f7 4d 89 f7 40 84 ed 74 27 e8
RSP: 0018:ffffc90006016ed8 EFLAGS: 00010293
RAX: ffffffff89ddf138 RBX: ffff8880330b1800 RCX: ffff88802825be80
RDX: 0000000000000000 RSI: ffffffff8c6d9a60 RDI: ffffffff8c6d9a20
RBP: 0000000000000000 R08: 00000000ffffffff R09: 1ffffffff1dd5cee
R10: dffffc0000000000 R11: fffffbfff1dd5cef R12: dffffc0000000000
R13: 1ffff1100661631e R14: ffff8880330b18c0 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888124cd2000(0063) knlGS:00000000f53f6b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000080001000 CR3: 000000004e87a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 tcf_ct_act+0x2a75/0x4050 net/sched/act_ct.c:1123
 tc_act include/net/tc_wrapper.h:131 [inline]
 tcf_action_exec+0x185/0x8d0 net/sched/act_api.c:1162
 tcf_exts_exec include/net/pkt_cls.h:361 [inline]
 basic_classify+0x1b2/0x2d0 net/sched/cls_basic.c:54
 tc_classify include/net/tc_wrapper.h:198 [inline]
 __tcf_classify net/sched/cls_api.c:1779 [inline]
 tcf_classify+0x43d/0x1160 net/sched/cls_api.c:1875
 tc_run+0x42d/0x750 net/core/dev.c:4463
 sch_handle_ingress net/core/dev.c:4538 [inline]
 __netif_receive_skb_core+0x1443/0x30c0 net/core/dev.c:6115
 __netif_receive_skb_one_core net/core/dev.c:6262 [inline]
 __netif_receive_skb net/core/dev.c:6377 [inline]
 netif_receive_skb_internal net/core/dev.c:6463 [inline]
 netif_receive_skb+0x1fe/0xbf0 net/core/dev.c:6522
 tun_rx_batched+0x1de/0x790 drivers/net/tun.c:1571
 tun_get_user+0x2be0/0x44d0 drivers/net/tun.c:2045
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:2091
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x27a/0x6a0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf7f380ec
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8
RSP: 002b:00000000f53f650c EFLAGS: 00000206 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000080000500
RDX: 000000000000001c RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	85 d2                	test   %edx,%edx
   3:	74 0a                	je     0xf
   5:	89 ce                	mov    %ecx,%esi
   7:	81 e6 ff 0f 00 00    	and    $0xfff,%esi
   d:	89 32                	mov    %esi,(%rdx)
   f:	85 c0                	test   %eax,%eax
  11:	74 05                	je     0x18
  13:	c1 e9 0c             	shr    $0xc,%ecx
  16:	89 08                	mov    %ecx,(%rax)
  18:	31 c0                	xor    %eax,%eax
  1a:	5e                   	pop    %rsi
  1b:	5d                   	pop    %rbp
  1c:	c3                   	ret
  1d:	90                   	nop
  1e:	0f 1f 00             	nopl   (%rax)
  21:	51                   	push   %rcx
  22:	52                   	push   %rdx
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter
  28:	cd 80                	int    $0x80
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	ret
  2e:	90                   	nop
  2f:	90                   	nop
  30:	90                   	nop
  31:	90                   	nop
  32:	90                   	nop
  33:	90                   	nop
  34:	90                   	nop
  35:	90                   	nop
  36:	90                   	nop
  37:	90                   	nop
  38:	90                   	nop
  39:	90                   	nop
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	58                   	pop    %rax
  3f:	b8                   	.byte 0xb8