====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc4-syzkaller-ge0f4c8dd9d2d #0 Not tainted ------------------------------------------------------ syz.6.356/8630 is trying to acquire lock: ffff8000925bf5b8 (nr_neigh_list_lock){+...}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff8000925bf5b8 (nr_neigh_list_lock){+...}-{3:3}, at: nr_remove_neigh+0x30/0xec net/netrom/nr_route.c:307 but task is already holding lock: ffff0000d8af1870 (&nr_node->node_lock){+...}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff0000d8af1870 (&nr_node->node_lock){+...}-{3:3}, at: nr_node_lock include/net/netrom.h:152 [inline] ffff0000d8af1870 (&nr_node->node_lock){+...}-{3:3}, at: nr_add_node+0xd8c/0x21b0 net/netrom/nr_route.c:214 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&nr_node->node_lock){+...}-{3:3}: __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x48/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] nr_node_lock include/net/netrom.h:152 [inline] nr_rt_device_down+0x128/0x660 net/netrom/nr_route.c:519 nr_device_event+0x138/0x164 net/netrom/af_netrom.c:126 notifier_call_chain+0x1b8/0x4e4 kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info net/core/dev.c:2176 [inline] call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] dev_close_many+0x2d4/0x448 net/core/dev.c:1731 netif_close+0x148/0x1f8 net/core/dev.c:1744 dev_close+0xf8/0x1e4 net/core/dev_api.c:219 bpq_device_event+0x308/0x5fc drivers/net/hamradio/bpqether.c:528 notifier_call_chain+0x1b8/0x4e4 kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info net/core/dev.c:2176 [inline] call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] dev_close_many+0x2d4/0x448 net/core/dev.c:1731 netif_close+0x148/0x1f8 net/core/dev.c:1744 dev_close+0xf8/0x1e4 net/core/dev_api.c:219 bond_setup_by_slave+0x70/0x374 drivers/net/bonding/bond_main.c:1627 bond_enslave+0x61c/0x2dd8 drivers/net/bonding/bond_main.c:2039 bond_do_ioctl+0x5b0/0x96c drivers/net/bonding/bond_main.c:4684 dev_siocbond net/core/dev_ioctl.c:502 [inline] dev_ifsioc+0x5ec/0xb90 net/core/dev_ioctl.c:650 dev_ioctl+0x4b0/0xc74 net/core/dev_ioctl.c:821 sock_do_ioctl+0x200/0x2b4 net/socket.c:1204 sock_ioctl+0x57c/0x84c net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #1 (nr_node_list_lock){+...}-{3:3}: __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x48/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] nr_rt_device_down+0xb4/0x660 net/netrom/nr_route.c:517 nr_device_event+0x138/0x164 net/netrom/af_netrom.c:126 notifier_call_chain+0x1b8/0x4e4 kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info net/core/dev.c:2176 [inline] call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] dev_close_many+0x2d4/0x448 net/core/dev.c:1731 netif_close+0x148/0x1f8 net/core/dev.c:1744 dev_close+0xf8/0x1e4 net/core/dev_api.c:219 bpq_device_event+0x308/0x5fc drivers/net/hamradio/bpqether.c:528 notifier_call_chain+0x1b8/0x4e4 kernel/notifier.c:85 raw_notifier_call_chain+0x3c/0x50 kernel/notifier.c:453 call_netdevice_notifiers_info net/core/dev.c:2176 [inline] call_netdevice_notifiers_extack net/core/dev.c:2214 [inline] call_netdevice_notifiers net/core/dev.c:2228 [inline] dev_close_many+0x2d4/0x448 net/core/dev.c:1731 netif_close+0x148/0x1f8 net/core/dev.c:1744 dev_close+0xf8/0x1e4 net/core/dev_api.c:219 bond_setup_by_slave+0x70/0x374 drivers/net/bonding/bond_main.c:1627 bond_enslave+0x61c/0x2dd8 drivers/net/bonding/bond_main.c:2039 bond_do_ioctl+0x5b0/0x96c drivers/net/bonding/bond_main.c:4684 dev_siocbond net/core/dev_ioctl.c:502 [inline] dev_ifsioc+0x5ec/0xb90 net/core/dev_ioctl.c:650 dev_ioctl+0x4b0/0xc74 net/core/dev_ioctl.c:821 sock_do_ioctl+0x200/0x2b4 net/socket.c:1204 sock_ioctl+0x57c/0x84c net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 -> #0 (nr_neigh_list_lock){+...}-{3:3}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x48/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] nr_remove_neigh+0x30/0xec net/netrom/nr_route.c:307 nr_add_node+0x19d0/0x21b0 net/netrom/nr_route.c:249 nr_rt_ioctl+0x904/0x9d8 net/netrom/nr_route.c:651 nr_ioctl+0x1c4/0x500 net/netrom/af_netrom.c:1254 sock_do_ioctl+0xf4/0x2b4 net/socket.c:1190 sock_ioctl+0x57c/0x84c net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 other info that might help us debug this: Chain exists of: nr_neigh_list_lock --> nr_node_list_lock --> &nr_node->node_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&nr_node->node_lock); lock(nr_node_list_lock); lock(&nr_node->node_lock); lock(nr_neigh_list_lock); *** DEADLOCK *** 1 lock held by syz.6.356/8630: #0: ffff0000d8af1870 (&nr_node->node_lock){+...}-{3:3}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] #0: ffff0000d8af1870 (&nr_node->node_lock){+...}-{3:3}, at: nr_node_lock include/net/netrom.h:152 [inline] #0: ffff0000d8af1870 (&nr_node->node_lock){+...}-{3:3}, at: nr_add_node+0xd8c/0x21b0 net/netrom/nr_route.c:214 stack backtrace: CPU: 0 UID: 0 PID: 8630 Comm: syz.6.356 Not tainted 6.15.0-rc4-syzkaller-ge0f4c8dd9d2d #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_circular_bug+0x324/0x32c kernel/locking/lockdep.c:2079 check_noncircular+0x154/0x174 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain kernel/locking/lockdep.c:3909 [inline] __lock_acquire+0x1728/0x3058 kernel/locking/lockdep.c:5235 lock_acquire+0x14c/0x2e0 kernel/locking/lockdep.c:5866 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x48/0x60 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] nr_remove_neigh+0x30/0xec net/netrom/nr_route.c:307 nr_add_node+0x19d0/0x21b0 net/netrom/nr_route.c:249 nr_rt_ioctl+0x904/0x9d8 net/netrom/nr_route.c:651 nr_ioctl+0x1c4/0x500 net/netrom/af_netrom.c:1254 sock_do_ioctl+0xf4/0x2b4 net/socket.c:1190 sock_ioctl+0x57c/0x84c net/socket.c:1311 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl fs/ioctl.c:892 [inline] __arm64_sys_ioctl+0x14c/0x1c4 fs/ioctl.c:892 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600