============================================
WARNING: possible recursive locking detected
5.15.162-syzkaller #0 Not tainted
--------------------------------------------
udevd/2963 is trying to acquire lock:
ffff888076b36d88 (&hsr->seqnr_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:368 [inline]
ffff888076b36d88 (&hsr->seqnr_lock){+.-.}-{2:2}, at: hsr_dev_xmit+0x13a/0x1e0 net/hsr/hsr_device.c:222
but task is already holding lock:
ffff88807f4e0d88 (&hsr->seqnr_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:368 [inline]
ffff88807f4e0d88 (&hsr->seqnr_lock){+.-.}-{2:2}, at: send_hsr_supervision_frame+0x272/0xad0 net/hsr/hsr_device.c:303
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
8 locks held by udevd/2963:
#0: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
#1: ffffc90000dd0be0 ((&hsr->announce_timer)){+.-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:45 [inline]
#1: ffffc90000dd0be0 ((&hsr->announce_timer)){+.-.}-{0:0}, at: call_timer_fn+0xbe/0x560 kernel/time/timer.c:1441
#2: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
#3: ffff88807f4e0d88 (&hsr->seqnr_lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:368 [inline]
#3: ffff88807f4e0d88 (&hsr->seqnr_lock){+.-.}-{2:2}, at: send_hsr_supervision_frame+0x272/0xad0 net/hsr/hsr_device.c:303
#4: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
#5: ffffffff8c91fb80 (rcu_read_lock_bh){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:312
#6: ffffffff8c91fb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
#7: ffffffff8c91fb80 (rcu_read_lock_bh){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:312
stack backtrace:
CPU: 1 PID: 2963 Comm: udevd Not tainted 5.15.162-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
print_deadlock_bug kernel/locking/lockdep.c:2946 [inline]
check_deadlock kernel/locking/lockdep.c:2989 [inline]
validate_chain+0x46d2/0x5930 kernel/locking/lockdep.c:3775
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
_raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:368 [inline]
hsr_dev_xmit+0x13a/0x1e0 net/hsr/hsr_device.c:222
__netdev_start_xmit include/linux/netdevice.h:5019 [inline]
netdev_start_xmit include/linux/netdevice.h:5033 [inline]
xmit_one net/core/dev.c:3617 [inline]
dev_hard_start_xmit+0x298/0x7a0 net/core/dev.c:3633
__dev_queue_xmit+0x1cee/0x3230 net/core/dev.c:4248
br_dev_queue_push_xmit+0x6e1/0x8a0 net/bridge/br_forward.c:53
NF_HOOK+0x36c/0x420 include/linux/netfilter.h:302
br_forward_finish+0x74/0x80 net/bridge/br_forward.c:66
NF_HOOK+0x36c/0x420 include/linux/netfilter.h:302
__br_forward+0x430/0x5f0 net/bridge/br_forward.c:115
deliver_clone net/bridge/br_forward.c:131 [inline]
maybe_deliver+0xb3/0x150 net/bridge/br_forward.c:189
br_flood+0x2e7/0x440 net/bridge/br_forward.c:231
br_dev_xmit+0xfb3/0x1520
__netdev_start_xmit include/linux/netdevice.h:5019 [inline]
netdev_start_xmit include/linux/netdevice.h:5033 [inline]
xmit_one net/core/dev.c:3617 [inline]
dev_hard_start_xmit+0x298/0x7a0 net/core/dev.c:3633
__dev_queue_xmit+0x1cee/0x3230 net/core/dev.c:4248
hsr_xmit net/hsr/hsr_forward.c:338 [inline]
hsr_forward_do net/hsr/hsr_forward.c:429 [inline]
hsr_forward_skb+0x133c/0x1b50 net/hsr/hsr_forward.c:577
send_hsr_supervision_frame+0x540/0xad0 net/hsr/hsr_device.c:326
hsr_announce+0x176/0x300 net/hsr/hsr_device.c:382
call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
__do_softirq kernel/softirq.c:592 [inline]
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:native_irq_enable arch/x86/include/asm/irqflags.h:45 [inline]
RIP: 0010:arch_local_irq_enable arch/x86/include/asm/irqflags.h:80 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:140 [inline]
RIP: 0010:seqcount_lockdep_reader_access+0x1d2/0x220 include/linux/seqlock.h:105
Code: 5e e8 e2 d5 a6 ff 4d 85 f6 48 bb 00 00 00 00 00 fc ff df 75 07 e8 ce d5 a6 ff eb 06 e8 c7 d5 a6 ff fb 48 c7 04 24 0e 36 e0 45 <4a> c7 04 23 00 00 00 00 66 42 c7 44 23 09 00 00 42 c6 44 23 0b 00
RSP: 0018:ffffc90002517820 EFLAGS: 00000293
RAX: ffffffff81d98599 RBX: dffffc0000000000 RCX: ffff88807d9c5940
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900025178c8 R08: ffffffff81d98574 R09: fffffbfff1bc8e76
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920004a2f04
R13: ffffc90002517840 R14: 0000000000000200 R15: 0000000000000046
set_root+0x175/0x3b0 fs/namei.c:942
nd_jump_root+0x2a6/0x410 fs/namei.c:963
path_init+0x36d/0x1190 fs/namei.c:2365
path_lookupat+0x27/0x450 fs/namei.c:2445
filename_lookup+0x230/0x5c0 fs/namei.c:2484
user_path_at_empty+0x40/0x180 fs/namei.c:2883
user_path_at include/linux/namei.h:57 [inline]
vfs_statx+0x106/0x3b0 fs/stat.c:221
vfs_fstatat fs/stat.c:243 [inline]
__do_sys_newfstatat fs/stat.c:411 [inline]
__se_sys_newfstatat fs/stat.c:405 [inline]
__x64_sys_newfstatat+0x12c/0x1b0 fs/stat.c:405
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f93d55835f4
Code: 64 c7 00 09 00 00 00 83 c8 ff c3 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 00 00 00 00 41 89 ca b8 06 01 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 10 48 8b 15 03 a8 0d 00 f7 d8 41 83 c8
RSP: 002b:00007fffc08a4618 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007fffc08a5fb8 RCX: 00007f93d55835f4
RDX: 00007fffc08a4628 RSI: 00007fffc08a4ab8 RDI: 00000000ffffff9c
RBP: 00007fffc08a46b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffc08a4ab8
R13: 00007fffc08a4628 R14: 000055fe69e32910 R15: 0000000000000000
----------------
Code disassembly (best guess):
0: 5e pop %rsi
1: e8 e2 d5 a6 ff call 0xffa6d5e8
6: 4d 85 f6 test %r14,%r14
9: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx
10: fc ff df
13: 75 07 jne 0x1c
15: e8 ce d5 a6 ff call 0xffa6d5e8
1a: eb 06 jmp 0x22
1c: e8 c7 d5 a6 ff call 0xffa6d5e8
21: fb sti
22: 48 c7 04 24 0e 36 e0 movq $0x45e0360e,(%rsp)
29: 45
* 2a: 4a c7 04 23 00 00 00 movq $0x0,(%rbx,%r12,1) <-- trapping instruction
31: 00
32: 66 42 c7 44 23 09 00 movw $0x0,0x9(%rbx,%r12,1)
39: 00
3a: 42 c6 44 23 0b 00 movb $0x0,0xb(%rbx,%r12,1)