======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
kworker/u8:24/25046 is trying to acquire lock:
ffff88805268d070 (&hsr->seqnr_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:348 [inline]
ffff88805268d070 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x237/0x360 net/hsr/hsr_device.c:235

but task is already holding lock:
ffff88806a228558 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: spin_lock include/linux/spinlock.h:342 [inline]
ffff88806a228558 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: __netif_tx_lock include/linux/netdevice.h:4809 [inline]
ffff88806a228558 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x15f/0x4c0 net/sched/sch_generic.c:370

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}:
       __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]
       __netif_tx_lock include/linux/netdevice.h:4809 [inline]
       sch_direct_xmit+0x15f/0x4c0 net/sched/sch_generic.c:370
       __dev_xmit_skb net/core/dev.c:4211 [inline]
       __dev_queue_xmit+0x1754/0x37f0 net/core/dev.c:4833
       dev_queue_xmit include/linux/netdevice.h:3446 [inline]
       hsr_xmit net/hsr/hsr_forward.c:440 [inline]
       hsr_forward_do net/hsr/hsr_forward.c:581 [inline]
       hsr_forward_skb+0x152a/0x28c0 net/hsr/hsr_forward.c:743
       send_hsr_supervision_frame+0x733/0xcf0 net/hsr/hsr_device.c:364
       hsr_announce+0x1db/0x370 net/hsr/hsr_device.c:421
       call_timer_fn+0x192/0x5e0 kernel/time/timer.c:1748
       expire_timers kernel/time/timer.c:1799 [inline]
       __run_timers kernel/time/timer.c:2374 [inline]
       __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2386
       run_timer_base kernel/time/timer.c:2395 [inline]
       run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2405
       handle_softirqs+0x225/0x840 kernel/softirq.c:622
       __do_softirq kernel/softirq.c:656 [inline]
       invoke_softirq kernel/softirq.c:496 [inline]
       __irq_exit_rcu+0xca/0x220 kernel/softirq.c:735
       irq_exit_rcu+0x9/0x30 kernel/softirq.c:752
       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
       asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
       __sanitizer_cov_trace_const_cmp4+0x0/0x90 kernel/kcov.c:309
       rcu_read_unlock include/linux/rcupdate.h:869 [inline]
       __d_lookup+0x648/0x790 fs/dcache.c:2633
       lookup_fast+0x82/0x5d0 fs/namei.c:1878
       walk_component fs/namei.c:2278 [inline]
       link_path_walk+0x71f/0x1910 fs/namei.c:2656
       path_openat+0x236/0x3830 fs/namei.c:4855
       do_file_open+0x23e/0x4a0 fs/namei.c:4888
       do_sys_openat2+0x115/0x200 fs/open.c:1368
       do_sys_open fs/open.c:1374 [inline]
       __do_sys_openat fs/open.c:1390 [inline]
       __se_sys_openat fs/open.c:1385 [inline]
       __x64_sys_openat+0x138/0x170 fs/open.c:1385
       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

-> #0 (&hsr->seqnr_lock){+.-.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x1520/0x2cf0 kernel/locking/lockdep.c:5237
       lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
       __raw_spin_lock_bh include/linux/spinlock_api_smp.h:150 [inline]
       _raw_spin_lock_bh+0x36/0x50 kernel/locking/spinlock.c:182
       spin_lock_bh include/linux/spinlock.h:348 [inline]
       hsr_dev_xmit+0x237/0x360 net/hsr/hsr_device.c:235
       __netdev_start_xmit include/linux/netdevice.h:5400 [inline]
       netdev_start_xmit include/linux/netdevice.h:5409 [inline]
       xmit_one net/core/dev.c:3889 [inline]
       dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:3905
       __dev_queue_xmit+0x1435/0x37f0 net/core/dev.c:4872
       NF_HOOK+0x33a/0x3c0 include/linux/netfilter.h:-1
       arp_xmit+0x16c/0x270 net/ipv4/arp.c:665
       arp_solicit+0xbdc/0xe40 net/ipv4/arp.c:392
       neigh_probe net/core/neighbour.c:1093 [inline]
       __neigh_event_send+0xf0c/0x1510 net/core/neighbour.c:1273
       neigh_event_send_probe include/net/neighbour.h:480 [inline]
       neigh_event_send include/net/neighbour.h:486 [inline]
       neigh_resolve_output+0x1a1/0x720 net/core/neighbour.c:1600
       neigh_output include/net/neighbour.h:560 [inline]
       ip_finish_output2+0xc4b/0x10b0 net/ipv4/ip_output.c:236
       NF_HOOK_COND include/linux/netfilter.h:307 [inline]
       ip_output+0x29f/0x450 net/ipv4/ip_output.c:437
       iptunnel_xmit+0x626/0xd10 net/ipv4/ip_tunnel_core.c:97
       ip_tunnel_xmit+0x195b/0x2040 net/ipv4/ip_tunnel.c:848
       __gre_xmit+0x19e/0x240 net/ipv4/ip_gre.c:491
       erspan_xmit+0xad5/0x1590 net/ipv4/ip_gre.c:750
       __netdev_start_xmit include/linux/netdevice.h:5400 [inline]
       netdev_start_xmit include/linux/netdevice.h:5409 [inline]
       xmit_one net/core/dev.c:3889 [inline]
       dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:3905
       sch_direct_xmit+0x257/0x4c0 net/sched/sch_generic.c:372
       __dev_xmit_skb net/core/dev.c:4211 [inline]
       __dev_queue_xmit+0x1754/0x37f0 net/core/dev.c:4833
       dev_queue_xmit include/linux/netdevice.h:3446 [inline]
       alb_send_lp_vid+0x348/0x550 drivers/net/bonding/bond_alb.c:949
       alb_send_learning_packets+0x12c/0x300 drivers/net/bonding/bond_alb.c:1012
       bond_alb_monitor+0x3d0/0x17c0 drivers/net/bonding/bond_alb.c:1563
       process_one_work kernel/workqueue.c:3322 [inline]
       process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
       worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
       kthread+0x388/0x470 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

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 ***

11 locks held by kworker/u8:24/25046:
 #0: ffff88807d733140 ((wq_completion)bond6#4){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
 #0: ffff88807d733140 ((wq_completion)bond6#4){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
 #1: ffffc9000434fc40 ((work_completion)(&(&bond->alb_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
 #1: ffffc9000434fc40 ((work_completion)(&(&bond->alb_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
 #2: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #2: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #2: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: bond_alb_monitor+0xf3/0x17c0 drivers/net/bonding/bond_alb.c:1546
 #3: ffffffff8e959c80 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
 #3: ffffffff8e959c80 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:893 [inline]
 #3: ffffffff8e959c80 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x29b/0x37f0 net/core/dev.c:4793
 #4: ffff88807ebfd228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5){+...}-{3:3}, at: spin_trylock include/linux/spinlock.h:354 [inline]
 #4: ffff88807ebfd228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5){+...}-{3:3}, at: qdisc_run_begin include/net/sch_generic.h:205 [inline]
 #4: ffff88807ebfd228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5){+...}-{3:3}, at: __dev_xmit_skb net/core/dev.c:4198 [inline]
 #4: ffff88807ebfd228 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#5){+...}-{3:3}, at: __dev_queue_xmit+0x112b/0x37f0 net/core/dev.c:4833
 #5: ffff88806a228558 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: spin_lock include/linux/spinlock.h:342 [inline]
 #5: ffff88806a228558 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: __netif_tx_lock include/linux/netdevice.h:4809 [inline]
 #5: ffff88806a228558 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x15f/0x4c0 net/sched/sch_generic.c:370
 #6: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #6: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #6: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: ip_output+0x5a/0x450 net/ipv4/ip_output.c:432
 #7: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #7: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #7: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2+0x3de/0x10b0 net/ipv4/ip_output.c:229
 #8: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #8: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #8: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: arp_xmit+0x23/0x270 net/ipv4/arp.c:663
 #9: ffffffff8e959c80 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
 #9: ffffffff8e959c80 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:893 [inline]
 #9: ffffffff8e959c80 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x29b/0x37f0 net/core/dev.c:4793
 #10: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #10: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
 #10: ffffffff8e959c20 (rcu_read_lock){....}-{1:3}, at: hsr_dev_xmit+0x2d/0x360 net/hsr/hsr_device.c:229

stack backtrace:
CPU: 0 UID: 0 PID: 25046 Comm: kworker/u8:24 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: bond6 bond_alb_monitor
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x1520/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:150 [inline]
 _raw_spin_lock_bh+0x36/0x50 kernel/locking/spinlock.c:182
 spin_lock_bh include/linux/spinlock.h:348 [inline]
 hsr_dev_xmit+0x237/0x360 net/hsr/hsr_device.c:235
 __netdev_start_xmit include/linux/netdevice.h:5400 [inline]
 netdev_start_xmit include/linux/netdevice.h:5409 [inline]
 xmit_one net/core/dev.c:3889 [inline]
 dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:3905
 __dev_queue_xmit+0x1435/0x37f0 net/core/dev.c:4872
 NF_HOOK+0x33a/0x3c0 include/linux/netfilter.h:-1
 arp_xmit+0x16c/0x270 net/ipv4/arp.c:665
 arp_solicit+0xbdc/0xe40 net/ipv4/arp.c:392
 neigh_probe net/core/neighbour.c:1093 [inline]
 __neigh_event_send+0xf0c/0x1510 net/core/neighbour.c:1273
 neigh_event_send_probe include/net/neighbour.h:480 [inline]
 neigh_event_send include/net/neighbour.h:486 [inline]
 neigh_resolve_output+0x1a1/0x720 net/core/neighbour.c:1600
 neigh_output include/net/neighbour.h:560 [inline]
 ip_finish_output2+0xc4b/0x10b0 net/ipv4/ip_output.c:236
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip_output+0x29f/0x450 net/ipv4/ip_output.c:437
 iptunnel_xmit+0x626/0xd10 net/ipv4/ip_tunnel_core.c:97
 ip_tunnel_xmit+0x195b/0x2040 net/ipv4/ip_tunnel.c:848
 __gre_xmit+0x19e/0x240 net/ipv4/ip_gre.c:491
 erspan_xmit+0xad5/0x1590 net/ipv4/ip_gre.c:750
 __netdev_start_xmit include/linux/netdevice.h:5400 [inline]
 netdev_start_xmit include/linux/netdevice.h:5409 [inline]
 xmit_one net/core/dev.c:3889 [inline]
 dev_hard_start_xmit+0x2cd/0x830 net/core/dev.c:3905
 sch_direct_xmit+0x257/0x4c0 net/sched/sch_generic.c:372
 __dev_xmit_skb net/core/dev.c:4211 [inline]
 __dev_queue_xmit+0x1754/0x37f0 net/core/dev.c:4833
 dev_queue_xmit include/linux/netdevice.h:3446 [inline]
 alb_send_lp_vid+0x348/0x550 drivers/net/bonding/bond_alb.c:949
 alb_send_learning_packets+0x12c/0x300 drivers/net/bonding/bond_alb.c:1012
 bond_alb_monitor+0x3d0/0x17c0 drivers/net/bonding/bond_alb.c:1563
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 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>