bridge0: port 1(bridge_slave_0) entered disabled state ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 0 PID: 7345 at kernel/locking/lockdep.c:234 hlock_class kernel/locking/lockdep.c:-1 [inline] WARNING: CPU: 0 PID: 7345 at kernel/locking/lockdep.c:234 check_wait_context kernel/locking/lockdep.c:4852 [inline] WARNING: CPU: 0 PID: 7345 at kernel/locking/lockdep.c:234 __lock_acquire+0x7b0/0x7904 kernel/locking/lockdep.c:5178 Modules linked in: CPU: 0 UID: 0 PID: 7345 Comm: kworker/u8:17 Not tainted 6.14.0-syzkaller-gd6b13dbd03b7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: netns cleanup_net pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : hlock_class kernel/locking/lockdep.c:-1 [inline] pc : check_wait_context kernel/locking/lockdep.c:4852 [inline] pc : __lock_acquire+0x7b0/0x7904 kernel/locking/lockdep.c:5178 lr : hlock_class kernel/locking/lockdep.c:234 [inline] lr : check_wait_context kernel/locking/lockdep.c:4852 [inline] lr : __lock_acquire+0x7a4/0x7904 kernel/locking/lockdep.c:5178 sp : ffff8000a2ec7000 x29: ffff8000a2ec72c0 x28: ffff0000da1a0000 x27: ffff0000da1a0b50 x26: 1fffe0001b43416a x25: 0000000000000000 x24: 0000000000000001 x23: ffff0000da1a0a88 x22: ffff0000da1a0b30 x21: ffff0000da1a0b54 x20: 0000000000001fc5 x19: ffff80009374abb8 x18: ffff8000a2ec6788 x17: 0000000000000000 x16: ffff8000832bccd4 x15: 0000000000000001 x14: 1fffe000366e6ef2 x13: dfff800000000000 x12: 0000000000000000 x11: 0000000000000003 x10: 0000000000ff0100 x9 : f23d24d144097e00 x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff8000804af3b8 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800080746fc0 x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000 Call trace: hlock_class kernel/locking/lockdep.c:-1 [inline] (P) check_wait_context kernel/locking/lockdep.c:4852 [inline] (P) __lock_acquire+0x7b0/0x7904 kernel/locking/lockdep.c:5178 (P) lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162 down+0x3c/0xe8 kernel/locking/semaphore.c:60 netpoll_poll_disable+0xe8/0x100 net/core/netpoll.c:222 __dev_close_many+0x104/0x408 net/core/dev.c:1691 dev_close_many+0x1e0/0x474 net/core/dev.c:1744 unregister_netdevice_many_notify+0x448/0x1c7c net/core/dev.c:11859 unregister_netdevice_many+0x28/0x38 net/core/dev.c:11951 cleanup_net+0x5d4/0xa48 net/core/net_namespace.c:647 process_one_work+0x810/0x1638 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3400 kthread+0x65c/0x7b0 kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 irq event stamp: 2271144 hardirqs last enabled at (2271143): [] __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:394 hardirqs last disabled at (2271144): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (2271144): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (2271142): [] pppoe_flush_dev drivers/net/ppp/pppoe.c:327 [inline] softirqs last enabled at (2271142): [] pppoe_device_event+0x464/0x4a0 drivers/net/ppp/pppoe.c:346 softirqs last disabled at (2271140): [] pppoe_flush_dev drivers/net/ppp/pppoe.c:279 [inline] softirqs last disabled at (2271140): [] pppoe_device_event+0xe8/0x4a0 drivers/net/ppp/pppoe.c:346 ---[ end trace 0000000000000000 ]--- Unable to handle kernel paging request at virtual address dfff800000000018 KASAN: null-ptr-deref in range [0x00000000000000c0-0x00000000000000c7] Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 [dfff800000000018] address between user and kernel address ranges Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP Modules linked in: CPU: 0 UID: 0 PID: 7345 Comm: kworker/u8:17 Tainted: G W 6.14.0-syzkaller-gd6b13dbd03b7 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: netns cleanup_net pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4852 [inline] pc : __lock_acquire+0x574/0x7904 kernel/locking/lockdep.c:5178 lr : hlock_class kernel/locking/lockdep.c:234 [inline] lr : check_wait_context kernel/locking/lockdep.c:4852 [inline] lr : __lock_acquire+0x7a4/0x7904 kernel/locking/lockdep.c:5178 sp : ffff8000a2ec7000 x29: ffff8000a2ec72c0 x28: ffff0000da1a0000 x27: ffff0000da1a0b50 x26: 1fffe0001b43416a x25: 0000000000000000 x24: 0000000000000001 x23: ffff0000da1a0a88 x22: ffff0000da1a0b30 x21: 00000000000000c4 x20: 0000000000001fc5 x19: ffff80009374abb8 x18: ffff8000a2ec6788 x17: 0000000000000000 x16: ffff8000832bccd4 x15: 0000000000000001 x14: 1fffe000366e6ef2 x13: dfff800000000000 x12: 0000000000000000 x11: 0000000000000003 x10: 0000000000ff0100 x9 : f23d24d144097e00 x8 : 0000000000000018 x7 : 4e5241575f534b43 x6 : ffff8000804af3b8 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff800080746fc0 x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000 Call trace: check_wait_context kernel/locking/lockdep.c:4852 [inline] (P) __lock_acquire+0x574/0x7904 kernel/locking/lockdep.c:5178 (P) lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x5c/0x7c kernel/locking/spinlock.c:162 down+0x3c/0xe8 kernel/locking/semaphore.c:60 netpoll_poll_disable+0xe8/0x100 net/core/netpoll.c:222 __dev_close_many+0x104/0x408 net/core/dev.c:1691 dev_close_many+0x1e0/0x474 net/core/dev.c:1744 unregister_netdevice_many_notify+0x448/0x1c7c net/core/dev.c:11859 unregister_netdevice_many+0x28/0x38 net/core/dev.c:11951 cleanup_net+0x5d4/0xa48 net/core/net_namespace.c:647 process_one_work+0x810/0x1638 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3400 kthread+0x65c/0x7b0 kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 Code: 34000fa8 aa1f03e8 91031115 d343fea8 (38ed6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 34000fa8 cbz w8, 0x1f4 4: aa1f03e8 mov x8, xzr 8: 91031115 add x21, x8, #0xc4 c: d343fea8 lsr x8, x21, #3 * 10: 38ed6908 ldrsb w8, [x8, x13] <-- trapping instruction