============================================
WARNING: possible recursive locking detected
6.9.0-rc5-syzkaller-01160-g2bd87951de65 #0 Not tainted
--------------------------------------------
syz-fuzzer/5082 is trying to acquire lock:
ffff888024fc6da0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff888024fc6da0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: hsr_dev_xmit+0x13e/0x1d0 net/hsr/hsr_device.c:228
but task is already holding lock:
ffff88802cb30da0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff88802cb30da0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: send_hsr_supervision_frame+0x276/0xad0 net/hsr/hsr_device.c:309
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&hsr->seqnr_lock);
lock(&hsr->seqnr_lock);
*** DEADLOCK ***
May be due to missing lock nesting notation
7 locks held by syz-fuzzer/5082:
#0: ffffc90000a08c00 ((&hsr->announce_timer)){+.-.}-{0:0}, at: call_timer_fn+0xc0/0x650 kernel/time/timer.c:1790
#1: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#1: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#1: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: hsr_announce+0xa3/0x370 net/hsr/hsr_device.c:386
#2: ffff88802cb30da0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#2: ffff88802cb30da0 (&hsr->seqnr_lock){+.-.}-{2:2}, at: send_hsr_supervision_frame+0x276/0xad0 net/hsr/hsr_device.c:309
#3: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#3: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#3: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: hsr_forward_skb+0xae/0x2400 net/hsr/hsr_forward.c:614
#4: ffffffff8e334d80 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#4: ffffffff8e334d80 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:833 [inline]
#4: ffffffff8e334d80 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x2c7/0x3ca0 net/core/dev.c:4304
#5: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#5: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#5: ffffffff8e334d20 (rcu_read_lock){....}-{1:2}, at: br_dev_xmit+0x1b9/0x1a10 net/bridge/br_device.c:44
#6: ffffffff8e334d80 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#6: ffffffff8e334d80 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:833 [inline]
#6: ffffffff8e334d80 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x2c7/0x3ca0 net/core/dev.c:4304
stack backtrace:
CPU: 1 PID: 5082 Comm: syz-fuzzer Not tainted 6.9.0-rc5-syzkaller-01160-g2bd87951de65 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
check_deadlock kernel/locking/lockdep.c:3062 [inline]
validate_chain+0x15c1/0x58e0 kernel/locking/lockdep.c:3856
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
hsr_dev_xmit+0x13e/0x1d0 net/hsr/hsr_device.c:228
__netdev_start_xmit include/linux/netdevice.h:4880 [inline]
netdev_start_xmit include/linux/netdevice.h:4894 [inline]
xmit_one net/core/dev.c:3564 [inline]
dev_hard_start_xmit+0x27a/0x7e0 net/core/dev.c:3580
__dev_queue_xmit+0x1ad1/0x3ca0 net/core/dev.c:4379
dev_queue_xmit include/linux/netdevice.h:3094 [inline]
br_dev_queue_push_xmit+0x701/0x8d0 net/bridge/br_forward.c:53
NF_HOOK+0x3a7/0x460 include/linux/netfilter.h:314
br_forward_finish+0xe5/0x140 net/bridge/br_forward.c:66
NF_HOOK+0x3a7/0x460 include/linux/netfilter.h:314
__br_forward+0x489/0x660 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xb3/0x150 net/bridge/br_forward.c:190
br_flood+0x2e4/0x660 net/bridge/br_forward.c:236
br_dev_xmit+0x118c/0x1a10
__netdev_start_xmit include/linux/netdevice.h:4880 [inline]
netdev_start_xmit include/linux/netdevice.h:4894 [inline]
xmit_one net/core/dev.c:3564 [inline]
dev_hard_start_xmit+0x27a/0x7e0 net/core/dev.c:3580
sch_direct_xmit+0x2b6/0x5f0 net/sched/sch_generic.c:343
qdisc_restart net/sched/sch_generic.c:408 [inline]
__qdisc_run+0xbfd/0x2170 net/sched/sch_generic.c:416
__dev_xmit_skb net/core/dev.c:3862 [inline]
__dev_queue_xmit+0x14c5/0x3ca0 net/core/dev.c:4345
dev_queue_xmit include/linux/netdevice.h:3094 [inline]
hsr_xmit net/hsr/hsr_forward.c:380 [inline]
hsr_forward_do net/hsr/hsr_forward.c:471 [inline]
hsr_forward_skb+0x183f/0x2400 net/hsr/hsr_forward.c:619
send_hsr_supervision_frame+0x548/0xad0 net/hsr/hsr_device.c:332
hsr_announce+0x1a9/0x370 net/hsr/hsr_device.c:388
call_timer_fn+0x18e/0x650 kernel/time/timer.c:1793
expire_timers kernel/time/timer.c:1844 [inline]
__run_timers kernel/time/timer.c:2418 [inline]
__run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2429
run_timer_base kernel/time/timer.c:2438 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2448
__do_softirq+0x2c6/0x980 kernel/softirq.c:554
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf2/0x1c0 kernel/softirq.c:633
irq_exit_rcu+0x9/0x30 kernel/softirq.c:645
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5283
Code: c9 50 e8 69 d3 0b 00 48 83 c4 08 4c 89 f7 e8 9d 38 00 00 0f 1f 44 00 00 4c 89 f7 e8 c0 10 25 0a e8 cb 96 36 00 fb 48 8b 5d c0 <48> 8d bb f0 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc
RSP: 0018:ffffc90003417968 EFLAGS: 00000286
RAX: fbcb24d3d479bc00 RBX: ffff88802000bc00 RCX: ffffffff94733603
RDX: dffffc0000000000 RSI: ffffffff8bcab8a0 RDI: ffffffff8c1f9740
RBP: ffffc900034179b0 R08: ffffffff8fa91aef R09: 1ffffffff1f5235d
R10: dffffc0000000000 R11: fffffbfff1f5235e R12: 1ffff110172a7e7f
R13: dffffc0000000000 R14: ffff8880b953e680 R15: ffff8880b953f3f8
context_switch kernel/sched/core.c:5412 [inline]
__schedule+0x17f0/0x4a50 kernel/sched/core.c:6746
__schedule_loop kernel/sched/core.c:6823 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6838
do_nanosleep+0x197/0x600 kernel/time/hrtimer.c:2051
hrtimer_nanosleep+0x227/0x470 kernel/time/hrtimer.c:2104
__do_sys_nanosleep kernel/time/hrtimer.c:2139 [inline]
__se_sys_nanosleep kernel/time/hrtimer.c:2125 [inline]
__x64_sys_nanosleep+0x26e/0x2d0 kernel/time/hrtimer.c:2125
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x472757
Code: 8b 44 24 20 b9 40 42 0f 00 f7 f1 48 89 04 24 b8 e8 03 00 00 f7 e2 48 89 44 24 08 48 89 e7 be 00 00 00 00 b8 23 00 00 00 0f 05 <48> 83 c4 10 5d c3 cc cc cc b8 ba 00 00 00 0f 05 89 44 24 08 c3 cc
RSP: 002b:000000c000069f18 EFLAGS: 00000206 ORIG_RAX: 0000000000000023
RAX: ffffffffffffffda RBX: 0000000000000140 RCX: 0000000000472757
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000c000069f18
RBP: 000000c000069f28 R08: 00000000000021fd R09: 00007fc0f54150b0
R10: 00007fc0f5415080 R11: 0000000000000206 R12: 000000c000069f18
R13: 000000c0003f8800 R14: 000000c0000064e0 R15: 0000000000000013
----------------
Code disassembly (best guess):
0: c9 leave
1: 50 push %rax
2: e8 69 d3 0b 00 call 0xbd370
7: 48 83 c4 08 add $0x8,%rsp
b: 4c 89 f7 mov %r14,%rdi
e: e8 9d 38 00 00 call 0x38b0
13: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
18: 4c 89 f7 mov %r14,%rdi
1b: e8 c0 10 25 0a call 0xa2510e0
20: e8 cb 96 36 00 call 0x3696f0
25: fb sti
26: 48 8b 5d c0 mov -0x40(%rbp),%rbx
* 2a: 48 8d bb f0 15 00 00 lea 0x15f0(%rbx),%rdi <-- trapping instruction
31: 48 89 f8 mov %rdi,%rax
34: 48 c1 e8 03 shr $0x3,%rax
38: 49 rex.WB
39: be 00 00 00 00 mov $0x0,%esi
3e: 00 fc add %bh,%ah