======================================================
WARNING: possible circular locking dependency detected
6.16.0-rc5-syzkaller-00212-g9f735b6f8a77-dirty #0 Not tainted
------------------------------------------------------
kworker/1:4/5901 is trying to acquire lock:
ffff8881251ecf30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x19a/0x220

but task is already holding lock:
ffff888026976558 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x153/0x4b0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}:
       lock_acquire+0x120/0x360
       _raw_spin_lock+0x2e/0x40
       sch_direct_xmit+0x153/0x4b0
       __dev_queue_xmit+0x17b6/0x3a70
       hsr_forward_skb+0x158b/0x2860
       send_prp_supervision_frame+0x35b/0x6c0
       hsr_announce+0x1d5/0x360
       call_timer_fn+0x17e/0x5f0
       __run_timer_base+0x61a/0x860
       run_timer_softirq+0xb7/0x180
       handle_softirqs+0x286/0x870
       __irq_exit_rcu+0xca/0x1f0
       irq_exit_rcu+0x9/0x30
       sysvec_apic_timer_interrupt+0xa6/0xc0
       asm_sysvec_apic_timer_interrupt+0x1a/0x20
       pv_native_safe_halt+0x13/0x20
       default_idle+0x13/0x20
       default_idle_call+0x74/0xb0
       do_idle+0x1e8/0x510
       cpu_startup_entry+0x44/0x60
       rest_init+0x2de/0x300
       start_kernel+0x47d/0x500
       x86_64_start_reservations+0x24/0x30
       x86_64_start_kernel+0x143/0x1c0
       common_startup_64+0x13e/0x147

-> #0 (&hsr->seqnr_lock){+.-.}-{3:3}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       _raw_spin_lock_bh+0x36/0x50
       hsr_dev_xmit+0x19a/0x220
       dev_hard_start_xmit+0x2d7/0x830
       __dev_queue_xmit+0x1adf/0x3a70
       ip_finish_output2+0xd40/0x1160
       iptunnel_xmit+0x571/0xa00
       ip_tunnel_xmit+0x1c3c/0x2380
       gre_tap_xmit+0x590/0x7a0
       dev_hard_start_xmit+0x2d7/0x830
       sch_direct_xmit+0x241/0x4b0
       __dev_queue_xmit+0x17b6/0x3a70
       ip6_finish_output2+0x11bc/0x16a0
       NF_HOOK+0x9e/0x380
       mld_sendpack+0x800/0xd80
       mld_ifc_work+0x835/0xde0
       process_scheduled_works+0xae1/0x17b0
       worker_thread+0x8a0/0xda0
       kthread+0x711/0x8a0
       ret_from_fork+0x3fc/0x770
       ret_from_fork_asm+0x1a/0x30

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&qdisc_xmit_lock_key#4);
                               lock(&hsr->seqnr_lock);
                               lock(&qdisc_xmit_lock_key#4);
  lock(&hsr->seqnr_lock);

 *** DEADLOCK ***

10 locks held by kworker/1:4/5901:
 #0: ffff88801fe10148 ((wq_completion)mld){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000377fbc0 ((work_completion)(&(&idev->mc_ifc_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff8880280da538 (&idev->mc_lock){+.+.}-{4:4}, at: mld_ifc_work+0x2d/0xde0
 #3: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: mld_sendpack+0x1de/0xd80
 #4: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: ip6_finish_output2+0x701/0x16a0
 #5: ffffffff8e13f1c0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #6: ffff88802fe2f258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#2){+.-.}-{3:3}, at: __dev_queue_xmit+0x1300/0x3a70
 #7: ffff888026976558 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x153/0x4b0
 #8: ffffffff8e13f160 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2+0x452/0x1160
 #9: ffffffff8e13f1c0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70

stack backtrace:
CPU: 1 UID: 0 PID: 5901 Comm: kworker/1:4 Not tainted 6.16.0-rc5-syzkaller-00212-g9f735b6f8a77-dirty #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: mld mld_ifc_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250
 print_circular_bug+0x2ee/0x310
 check_noncircular+0x134/0x160
 validate_chain+0xb9b/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 _raw_spin_lock_bh+0x36/0x50
 hsr_dev_xmit+0x19a/0x220
 dev_hard_start_xmit+0x2d7/0x830
 __dev_queue_xmit+0x1adf/0x3a70
 ip_finish_output2+0xd40/0x1160
 iptunnel_xmit+0x571/0xa00
 ip_tunnel_xmit+0x1c3c/0x2380
 gre_tap_xmit+0x590/0x7a0
 dev_hard_start_xmit+0x2d7/0x830
 sch_direct_xmit+0x241/0x4b0
 __dev_queue_xmit+0x17b6/0x3a70
 ip6_finish_output2+0x11bc/0x16a0
 NF_HOOK+0x9e/0x380
 mld_sendpack+0x800/0xd80
 mld_ifc_work+0x835/0xde0
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
