============================================
WARNING: possible recursive locking detected
6.14.0-syzkaller-13305-g61f96e684edd #0 Not tainted
--------------------------------------------
syz.4.242/6950 is trying to acquire lock:
ffff888053a66f30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff888053a66f30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x18a/0x210 net/hsr/hsr_device.c:234
but task is already holding lock:
ffff888032ec4f30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff888032ec4f30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x18a/0x210 net/hsr/hsr_device.c:234
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
15 locks held by syz.4.242/6950:
#0: ffffffff900efe90 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:514
#1: ffffffff8fe63b90 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x19c/0x280 drivers/infiniband/core/device.c:1178
#2: ffffffff8fe63d50 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x1ea/0x280 drivers/infiniband/core/device.c:1183
#3: ffff88807e7ecf60 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x10d/0x7a0 drivers/infiniband/core/device.c:942
#4: ffff88801bef7148 (&root->kernfs_rwsem){++++}-{4:4}, at: kernfs_add_one+0x41/0x530 fs/kernfs/dir.c:791
#5: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#5: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#5: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
#5: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: kernfs_root+0x1c/0x230 fs/kernfs/kernfs-internal.h:73
#6: ffffc90000007bc0 ((&ndev->rs_timer)){+.-.}-{0:0}, at: call_timer_fn+0xc2/0x650 kernel/time/timer.c:1786
#7: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#7: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#7: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: ndisc_send_skb+0x1ef/0x1560 net/ipv6/ndisc.c:484
#8: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#8: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#8: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: ip6_finish_output2+0x701/0x1750 net/ipv6/ip6_output.c:126
#9: ffffffff8ed3e040 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#9: ffffffff8ed3e040 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:892 [inline]
#9: ffffffff8ed3e040 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x2f9/0x3f60 net/core/dev.c:4561
#10: ffff888032ec4f30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#10: ffff888032ec4f30 (&hsr->seqnr_lock){+.-.}-{3:3}, at: hsr_dev_xmit+0x18a/0x210 net/hsr/hsr_device.c:234
#11: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#11: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#11: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: hsr_forward_skb+0xb8/0x2d20 net/hsr/hsr_forward.c:728
#12: ffffffff8ed3e040 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#12: ffffffff8ed3e040 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:892 [inline]
#12: ffffffff8ed3e040 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x2f9/0x3f60 net/core/dev.c:4561
#13: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#13: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#13: ffffffff8ed3dfe0 (rcu_read_lock){....}-{1:3}, at: br_dev_xmit+0x220/0x1c00 net/bridge/br_device.c:52
#14: ffffffff8ed3e040 (rcu_read_lock_bh){....}-{1:3}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
#14: ffffffff8ed3e040 (rcu_read_lock_bh){....}-{1:3}, at: rcu_read_lock_bh include/linux/rcupdate.h:892 [inline]
#14: ffffffff8ed3e040 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x2f9/0x3f60 net/core/dev.c:4561
stack backtrace:
CPU: 0 UID: 0 PID: 6950 Comm: syz.4.242 Not tainted 6.14.0-syzkaller-13305-g61f96e684edd #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_deadlock_bug+0x2be/0x2d0 kernel/locking/lockdep.c:3042
check_deadlock kernel/locking/lockdep.c:3094 [inline]
validate_chain+0x928/0x24e0 kernel/locking/lockdep.c:3896
__lock_acquire+0xad5/0xd80 kernel/locking/lockdep.c:5235
lock_acquire+0x116/0x2f0 kernel/locking/lockdep.c:5866
__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+0x18a/0x210 net/hsr/hsr_device.c:234
__netdev_start_xmit include/linux/netdevice.h:5201 [inline]
netdev_start_xmit include/linux/netdevice.h:5210 [inline]
xmit_one net/core/dev.c:3783 [inline]
dev_hard_start_xmit+0x2d4/0x840 net/core/dev.c:3799
__dev_queue_xmit+0x1b80/0x3f60 net/core/dev.c:4636
dev_queue_xmit include/linux/netdevice.h:3350 [inline]
br_dev_queue_push_xmit+0x771/0x950 net/bridge/br_forward.c:53
NF_HOOK+0x3ac/0x460 include/linux/netfilter.h:314
br_forward_finish+0xd8/0x130 net/bridge/br_forward.c:66
NF_HOOK+0x3ac/0x460 include/linux/netfilter.h:314
__br_forward+0x46a/0x640 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+0x2e4/0x680 net/bridge/br_forward.c:237
br_dev_xmit+0x12ac/0x1c00 net/bridge/br_device.c:-1
__netdev_start_xmit include/linux/netdevice.h:5201 [inline]
netdev_start_xmit include/linux/netdevice.h:5210 [inline]
xmit_one net/core/dev.c:3783 [inline]
dev_hard_start_xmit+0x2d4/0x840 net/core/dev.c:3799
__dev_queue_xmit+0x1b80/0x3f60 net/core/dev.c:4636
dev_queue_xmit include/linux/netdevice.h:3350 [inline]
hsr_xmit net/hsr/hsr_forward.c:430 [inline]
hsr_forward_do net/hsr/hsr_forward.c:571 [inline]
hsr_forward_skb+0x184c/0x2d20 net/hsr/hsr_forward.c:733
hsr_dev_xmit+0x195/0x210 net/hsr/hsr_device.c:235
__netdev_start_xmit include/linux/netdevice.h:5201 [inline]
netdev_start_xmit include/linux/netdevice.h:5210 [inline]
xmit_one net/core/dev.c:3783 [inline]
dev_hard_start_xmit+0x2d4/0x840 net/core/dev.c:3799
__dev_queue_xmit+0x1b80/0x3f60 net/core/dev.c:4636
neigh_output include/net/neighbour.h:539 [inline]
ip6_finish_output2+0x1296/0x1750 net/ipv6/ip6_output.c:141
__ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]
ip6_finish_output+0x421/0x840 net/ipv6/ip6_output.c:226
NF_HOOK include/linux/netfilter.h:314 [inline]
ndisc_send_skb+0xb58/0x1560 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x380/0x680 net/ipv6/addrconf.c:4037
call_timer_fn+0x189/0x650 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1840 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x66e/0x8e0 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2445
handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x167/0x2f0 arch/x86/include/asm/irqflags.h:-1
Code: c7 44 24 10 00 00 00 00 9c 8f 44 24 10 f7 44 24 10 00 02 00 00 0f 85 fd 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 65 48 8b 45 00 <48> 3b 44 24 38 0f 85 72 01 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e
RSP: 0018:ffffc9000484f3f8 EFLAGS: 00000206
RAX: 60424aacb0edd400 RBX: ffffffff8ed3dfe0 RCX: 60424aacb0edd400
RDX: 0000000000000000 RSI: ffffffff8e4fce8a RDI: ffffffff8ca1b120
RBP: ffffffff9368a020 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000246 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
kernfs_root+0x39/0x230 fs/kernfs/kernfs-internal.h:73
kernfs_root_is_locked fs/kernfs/kernfs-internal.h:107 [inline]
kernfs_rcu_name fs/kernfs/kernfs-internal.h:112 [inline]
kernfs_sd_compare fs/kernfs/dir.c:349 [inline]
kernfs_link_sibling+0xf1/0x3b0 fs/kernfs/dir.c:380
kernfs_add_one+0x1ef/0x530 fs/kernfs/dir.c:810
__kernfs_create_file+0x22e/0x2e0 fs/kernfs/file.c:1067
sysfs_add_file_mode_ns+0x24a/0x310 fs/sysfs/file.c:319
create_files fs/sysfs/group.c:76 [inline]
internal_create_group+0x7ea/0x1320 fs/sysfs/group.c:183
internal_create_groups fs/sysfs/group.c:223 [inline]
sysfs_create_groups+0x56/0x120 fs/sysfs/group.c:249
setup_port drivers/infiniband/core/sysfs.c:1247 [inline]
ib_setup_port_attrs+0xfc7/0x2490 drivers/infiniband/core/sysfs.c:1433
add_one_compat_dev+0x59e/0x7a0 drivers/infiniband/core/device.c:968
rdma_dev_init_net+0x1f5/0x280 drivers/infiniband/core/device.c:1184
ops_init+0x349/0x5b0 net/core/net_namespace.c:138
setup_net+0x289/0x9f0 net/core/net_namespace.c:364
copy_net_ns+0x33f/0x570 net/core/net_namespace.c:518
create_new_namespaces+0x425/0x7b0 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
ksys_unshare+0x5e2/0xad0 kernel/fork.c:3375
__do_sys_unshare kernel/fork.c:3446 [inline]
__se_sys_unshare kernel/fork.c:3444 [inline]
__x64_sys_unshare+0x38/0x40 kernel/fork.c:3444
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f412398d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f412473d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f4123ba5fa0 RCX: 00007f412398d169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000062040200
RBP: 00007f4123a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4123ba5fa0 R15: 00007ffe4ef6c8e8
----------------
Code disassembly (best guess):
0: c7 44 24 10 00 00 00 movl $0x0,0x10(%rsp)
7: 00
8: 9c pushf
9: 8f 44 24 10 pop 0x10(%rsp)
d: f7 44 24 10 00 02 00 testl $0x200,0x10(%rsp)
14: 00
15: 0f 85 fd 00 00 00 jne 0x118
1b: 41 f7 c6 00 02 00 00 test $0x200,%r14d
22: 74 01 je 0x25
24: fb sti
25: 65 48 8b 45 00 mov %gs:0x0(%rbp),%rax
* 2a: 48 3b 44 24 38 cmp 0x38(%rsp),%rax <-- trapping instruction
2f: 0f 85 72 01 00 00 jne 0x1a7
35: 48 83 c4 40 add $0x40,%rsp
39: 5b pop %rbx
3a: 41 5c pop %r12
3c: 41 5d pop %r13
3e: 41 5e pop %r14