------------[ cut here ]------------
DEBUG_LOCKS_WARN_ON(1)
WARNING: kernel/locking/lockdep.c:238 at hlock_class kernel/locking/lockdep.c:238 [inline], CPU#0: syz.5.73/6082
WARNING: kernel/locking/lockdep.c:238 at check_wait_context kernel/locking/lockdep.c:4854 [inline], CPU#0: syz.5.73/6082
WARNING: kernel/locking/lockdep.c:238 at __lock_acquire+0x382/0x2cf0 kernel/locking/lockdep.c:5187, CPU#0: syz.5.73/6082
Modules linked in:
CPU: 0 UID: 0 PID: 6082 Comm: syz.5.73 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:hlock_class kernel/locking/lockdep.c:238 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4854 [inline]
RIP: 0010:__lock_acquire+0x389/0x2cf0 kernel/locking/lockdep.c:5187
Code: 83 3d da 46 d6 18 00 75 27 90 e8 62 fd 2d 03 85 c0 74 1c 83 3d 8b fd b4 0e 00 75 13 48 8d 3d 0e 5a b8 0e 48 c7 c6 83 5c 35 8e <67> 48 0f b9 3a 90 31 c0 0f b6 98 c4 00 00 00 41 8b 45 20 25 ff 1f
RSP: 0018:ffffc900000079f8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000042000 RCX: ffff888020355dc0
RDX: 0000000000000100 RSI: ffffffff8e355c83 RDI: ffffffff905b18d0
RBP: 0000000000000001 R08: ffffffff9057bc43 R09: 1ffffffff20af788
R10: dffffc0000000000 R11: fffffbfff20af789 R12: 0000000000000976
R13: ffff8880203569e0 R14: ffff888020355dc0 R15: ffff888020356968
FS:  00007f81b32ca6c0(0000) GS:ffff888124f45000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33416ff8 CR3: 00000000346c1000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 __raw_spin_lock include/linux/spinlock_api_smp.h:158 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:158
 spin_lock include/linux/spinlock.h:342 [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:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 bh_worker+0x44e/0x840 kernel/workqueue.c:3708
 tasklet_action+0xc/0x70 kernel/softirq.c:965
 handle_softirqs+0x225/0x840 kernel/softirq.c:622
 do_softirq+0x76/0xd0 kernel/softirq.c:523
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:914 [inline]
 __dev_queue_xmit+0x1edc/0x3820 net/core/dev.c:4913
 dev_queue_xmit include/linux/netdevice.h:3448 [inline]
 pppoe_sendmsg+0x5e3/0x830 drivers/net/ppp/pppoe.c:833
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2709
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2763
 __sys_sendmmsg+0x273/0x4d0 net/socket.c:2852
 __do_sys_sendmmsg net/socket.c:2879 [inline]
 __se_sys_sendmmsg net/socket.c:2876 [inline]
 __x64_sys_sendmmsg+0xa0/0xc0 net/socket.c:2876
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f81b239e0d9
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:00007f81b32ca028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f81b2625fa0 RCX: 00007f81b239e0d9
RDX: 0000000000034000 RSI: 00002000000008c0 RDI: 0000000000000007
RBP: 00007f81b2435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f81b2626038 R14: 00007f81b2625fa0 R15: 00007ffc1ca22218
 </TASK>
----------------
Code disassembly (best guess):
   0:	83 3d da 46 d6 18 00 	cmpl   $0x0,0x18d646da(%rip)        # 0x18d646e1
   7:	75 27                	jne    0x30
   9:	90                   	nop
   a:	e8 62 fd 2d 03       	call   0x32dfd71
   f:	85 c0                	test   %eax,%eax
  11:	74 1c                	je     0x2f
  13:	83 3d 8b fd b4 0e 00 	cmpl   $0x0,0xeb4fd8b(%rip)        # 0xeb4fda5
  1a:	75 13                	jne    0x2f
  1c:	48 8d 3d 0e 5a b8 0e 	lea    0xeb85a0e(%rip),%rdi        # 0xeb85a31
  23:	48 c7 c6 83 5c 35 8e 	mov    $0xffffffff8e355c83,%rsi
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	90                   	nop
  30:	31 c0                	xor    %eax,%eax
  32:	0f b6 98 c4 00 00 00 	movzbl 0xc4(%rax),%ebx
  39:	41 8b 45 20          	mov    0x20(%r13),%eax
  3d:	25                   	.byte 0x25
  3e:	ff 1f                	lcall  *(%rdi)