======================================================
WARNING: possible circular locking dependency detected
6.16.0-rc3-syzkaller-00159-g223e2288f4b8 #0 Not tainted
------------------------------------------------------
syz-executor/5816 is trying to acquire lock:
ffff888039e48f30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x19a/0x220

but task is already holding lock:
ffff88810f2d5958 (&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
       hsr_dev_xmit+0x1a5/0x220
       dev_hard_start_xmit+0x2d7/0x830
       __dev_queue_xmit+0x1adf/0x3a70
       ip6_finish_output2+0x11fe/0x16a0
       ip6_finish_output+0x234/0x7d0
       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

-> #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
       NF_HOOK+0x310/0x3a0
       arp_xmit+0x16c/0x270
       arp_solicit+0xc1d/0xe60
       __neigh_event_send+0xf70/0x1560
       neigh_resolve_output+0x198/0x750
       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
       bond_start_xmit+0x1207/0x1a90
       dev_hard_start_xmit+0x2d7/0x830
       __dev_queue_xmit+0x1adf/0x3a70
       ip6_finish_output2+0x11bc/0x16a0
       ip6_finish_output+0x234/0x7d0
       ndisc_send_skb+0xb47/0x1400
       addrconf_rs_timer+0x369/0x670
       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
       lock_acquire+0xcd/0x360
       pfn_valid+0xd6/0x490
       page_table_check_set+0x25/0x730
       copy_pmd_range+0x4262/0x7000
       copy_page_range+0xc46/0x1270
       dup_mmap+0xf57/0x1ac0
       copy_mm+0x13c/0x4b0
       copy_process+0x1706/0x3c00
       kernel_clone+0x21e/0x870
       __x64_sys_clone+0x18b/0x1e0
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

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 ***

18 locks held by syz-executor/5816:
 #0: ffffffff8e1f8130 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x131/0x4b0
 #1: ffff88810ec557e0 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x12e/0x1ac0
 #2: ffff88810ec537a0 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x217/0x1ac0
 #3: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: ___pte_offset_map+0x29/0x2c0
 #4: ffff888022987eb8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: __pte_offset_map_lock+0x13e/0x210
 #5: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: ___pte_offset_map+0x29/0x2c0
 #6: ffff88801a475b58 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pmd_range+0x6bf/0x7000
 #7: ffffc90000007be0 ((&ndev->rs_timer)){+.-.}-{0:0}, at: call_timer_fn+0xbe/0x5f0
 #8: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: ndisc_send_skb+0x208/0x1400
 #9: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: ip6_finish_output2+0x701/0x16a0
 #10: ffffffff8e13eec0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #11: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: bond_start_xmit+0x101/0x1a90
 #12: ffffffff8e13eec0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70
 #13: ffff888110728258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock#2){+...}-{3:3}, at: __dev_queue_xmit+0x1300/0x3a70
 #14: ffff88810f2d5958 (&qdisc_xmit_lock_key#4){+.-.}-{3:3}, at: sch_direct_xmit+0x153/0x4b0
 #15: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2+0x452/0x1160
 #16: ffffffff8e13ee60 (rcu_read_lock){....}-{1:3}, at: arp_xmit+0x23/0x270
 #17: ffffffff8e13eec0 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x27e/0x3a70

stack backtrace:
CPU: 0 UID: 0 PID: 5816 Comm: syz-executor Not tainted 6.16.0-rc3-syzkaller-00159-g223e2288f4b8 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <IRQ>
 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
 NF_HOOK+0x310/0x3a0
 arp_xmit+0x16c/0x270
 arp_solicit+0xc1d/0xe60
 __neigh_event_send+0xf70/0x1560
 neigh_resolve_output+0x198/0x750
 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
 bond_start_xmit+0x1207/0x1a90
 dev_hard_start_xmit+0x2d7/0x830
 __dev_queue_xmit+0x1adf/0x3a70
 ip6_finish_output2+0x11bc/0x16a0
 ip6_finish_output+0x234/0x7d0
 ndisc_send_skb+0xb47/0x1400
 addrconf_rs_timer+0x369/0x670
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:lock_acquire+0xcd/0x360
Code: 0f 85 eb 00 00 00 65 48 8b 04 25 08 00 9d 92 83 b8 ec 0a 00 00 00 0f 85 d5 00 00 00 48 c7 44 24 30 00 00 00 00 9c 8f 44 24 30 <4c> 89 74 24 10 4d 89 fe 4c 8b 7c 24 30 fa 48 c7 c7 bc 5a 99 8d e8
RSP: 0018:ffffc9000313f290 EFLAGS: 00000246
RAX: ffff88810f1f9cc0 RBX: 0000000000000000 RCX: dfe0eba78a5ba400
RDX: 0000000000000000 RSI: ffffffff822f09b6 RDI: 1ffffffff1c27de4
RBP: ffffffff822f099a R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff9400089ea79 R12: 0000000000000002
R13: ffffffff8e13ef20 R14: 0000000000000000 R15: 0000000000000000
 pfn_valid+0xd6/0x490
 page_table_check_set+0x25/0x730
 copy_pmd_range+0x4262/0x7000
 copy_page_range+0xc46/0x1270
 dup_mmap+0xf57/0x1ac0
 copy_mm+0x13c/0x4b0
 copy_process+0x1706/0x3c00
 kernel_clone+0x21e/0x870
 __x64_sys_clone+0x18b/0x1e0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff51ff85193
Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffcced344e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff51ff85193
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 00005555577207d0 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000927c0 R14: 00000000000317cc R15: 00007ffcced34680
 </TASK>
