------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: kernel/locking/lockdep.c:238 at hlock_class kernel/locking/lockdep.c:238 [inline], CPU#1: ipvs-m:1:0/8552
WARNING: kernel/locking/lockdep.c:238 at check_wait_context kernel/locking/lockdep.c:4870 [inline], CPU#1: ipvs-m:1:0/8552
WARNING: kernel/locking/lockdep.c:238 at __lock_acquire+0x3b7/0x2e50 kernel/locking/lockdep.c:5204, CPU#1: ipvs-m:1:0/8552
Modules linked in:
CPU: 1 UID: 0 PID: 8552 Comm: ipvs-m:1:0 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:hlock_class kernel/locking/lockdep.c:238 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4870 [inline]
RIP: 0010:__lock_acquire+0x3be/0x2e50 kernel/locking/lockdep.c:5204
Code: fa 18 00 74 04 31 c0 eb 2d 90 e8 cd 92 37 03 85 c0 74 1c 83 3d 56 28 d7 0e 00 75 13 48 8d 3d e9 30 da 0e 48 c7 c6 5e d9 59 8e <67> 48 0f b9 3a 90 31 c0 48 8b 3c 24 0f b6 98 c4 00 00 00 49 8b 46
RSP: 0018:ffffc90000a189b8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff888020bb1f40
RDX: 8000000000000100 RSI: ffffffff8e59d95e RDI: ffffffff907d5220
RBP: 0000000000000000 R08: 0000000000000100 R09: 1ffffffff20f4930
R10: dffffc0000000000 R11: fffffbfff20f4931 R12: 0000000000000e6a
R13: ffff888020bb2af0 R14: ffff888020bb2b40 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff888124dd8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000000755d2000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908
 __raw_spin_lock include/linux/spinlock_api_smp.h:190 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:173
 spin_lock include/linux/spinlock.h:347 [inline]
 tcp_tsq_handler+0x29/0x200 net/ipv4/tcp_output.c:1291
 tcp_tsq_workfn+0x384/0x410 net/ipv4/tcp_output.c:1325
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 bh_worker+0x451/0x870 kernel/workqueue.c:3782
 tasklet_action+0xc/0x70 kernel/softirq.c:997
 handle_softirqs+0x226/0x860 kernel/softirq.c:645
 do_softirq+0x77/0xd0 kernel/softirq.c:546
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
 spin_unlock_bh include/linux/spinlock.h:407 [inline]
 sb_dequeue net/netfilter/ipvs/ip_vs_sync.c:319 [inline]
 next_sync_buff net/netfilter/ipvs/ip_vs_sync.c:1639 [inline]
 sync_thread_master+0x3a8/0x11b0 net/netfilter/ipvs/ip_vs_sync.c:1659
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	fa                   	cli
   1:	18 00                	sbb    %al,(%rax)
   3:	74 04                	je     0x9
   5:	31 c0                	xor    %eax,%eax
   7:	eb 2d                	jmp    0x36
   9:	90                   	nop
   a:	e8 cd 92 37 03       	call   0x33792dc
   f:	85 c0                	test   %eax,%eax
  11:	74 1c                	je     0x2f
  13:	83 3d 56 28 d7 0e 00 	cmpl   $0x0,0xed72856(%rip)        # 0xed72870
  1a:	75 13                	jne    0x2f
  1c:	48 8d 3d e9 30 da 0e 	lea    0xeda30e9(%rip),%rdi        # 0xeda310c
  23:	48 c7 c6 5e d9 59 8e 	mov    $0xffffffff8e59d95e,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	90                   	nop
  30:	31 c0                	xor    %eax,%eax
  32:	48 8b 3c 24          	mov    (%rsp),%rdi
  36:	0f b6 98 c4 00 00 00 	movzbl 0xc4(%rax),%ebx
  3d:	49                   	rex.WB
  3e:	8b                   	.byte 0x8b
  3f:	46                   	rex.RX