bridge0: port 1(bridge_slave_0) entered disabled state ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 0 PID: 7557 at kernel/locking/lockdep.c:232 check_wait_context kernel/locking/lockdep.c:4850 [inline] WARNING: CPU: 0 PID: 7557 at kernel/locking/lockdep.c:232 __lock_acquire+0x7b0/0x7904 kernel/locking/lockdep.c:5176 Modules linked in: CPU: 0 UID: 0 PID: 7557 Comm: kworker/u8:12 Tainted: G W 6.13.0-rc6-syzkaller-g577490b6abb9 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: netns cleanup_net pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4850 [inline] pc : __lock_acquire+0x7b0/0x7904 kernel/locking/lockdep.c:5176 lr : hlock_class kernel/locking/lockdep.c:232 [inline] lr : check_wait_context kernel/locking/lockdep.c:4850 [inline] lr : __lock_acquire+0x7a4/0x7904 kernel/locking/lockdep.c:5176 sp : ffff80009eff7040 x29: ffff80009eff7300 x28: ffff0000d7a60000 x27: ffff0000d7a60b40 x26: 1fffe0001af4c168 x25: 0000000000000000 x24: 0000000000000001 x23: ffff0000d7a60a78 x22: ffff0000d7a60b20 x21: ffff0000d7a60b44 x20: 00000000000015c5 x19: ffff8000931c7a78 x18: ffff80009eff6738 x17: 0000000000000000 x16: ffff8000803b4180 x15: 0000000000000001 x14: 1ffff00011f49f9c x13: dfff800000000000 x12: 0000000000000000 x11: 0000000000000003 x10: 0000000000ff0100 x9 : 0c98272ec0943100 x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff8000804a69fc x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008047cc34 x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000 Call trace: check_wait_context kernel/locking/lockdep.c:4850 [inline] (P) __lock_acquire+0x7b0/0x7904 kernel/locking/lockdep.c:5176 (P) lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849 __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:59 netpoll_poll_disable+0xe8/0x100 net/core/netpoll.c:222 __dev_close_many+0x104/0x3c8 net/core/dev.c:1532 dev_close_many+0x1e0/0x474 net/core/dev.c:1585 unregister_netdevice_many_notify+0x454/0x1c6c net/core/dev.c:11502 unregister_netdevice_many+0x28/0x38 net/core/dev.c:11592 cleanup_net+0x5c8/0xa34 net/core/net_namespace.c:643 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:862 irq event stamp: 489272 hardirqs last enabled at (489271): [] __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:394 hardirqs last disabled at (489272): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (489272): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (489270): [] pppoe_flush_dev drivers/net/ppp/pppoe.c:327 [inline] softirqs last enabled at (489270): [] pppoe_device_event+0x464/0x4a0 drivers/net/ppp/pppoe.c:346 softirqs last disabled at (489268): [] pppoe_flush_dev drivers/net/ppp/pppoe.c:279 [inline] softirqs last disabled at (489268): [] 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: 7557 Comm: kworker/u8:12 Tainted: G W 6.13.0-rc6-syzkaller-g577490b6abb9 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: netns cleanup_net pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4850 [inline] pc : __lock_acquire+0x574/0x7904 kernel/locking/lockdep.c:5176 lr : hlock_class kernel/locking/lockdep.c:232 [inline] lr : check_wait_context kernel/locking/lockdep.c:4850 [inline] lr : __lock_acquire+0x7a4/0x7904 kernel/locking/lockdep.c:5176 sp : ffff80009eff7040 x29: ffff80009eff7300 x28: ffff0000d7a60000 x27: ffff0000d7a60b40 x26: 1fffe0001af4c168 x25: 0000000000000000 x24: 0000000000000001 x23: ffff0000d7a60a78 x22: ffff0000d7a60b20 x21: 00000000000000c4 x20: 00000000000015c5 x19: ffff8000931c7a78 x18: ffff80009eff6738 x17: 0000000000000000 x16: ffff8000803b4180 x15: 0000000000000001 x14: 1ffff00011f49f9c x13: dfff800000000000 x12: 0000000000000000 x11: 0000000000000003 x10: 0000000000ff0100 x9 : 0c98272ec0943100 x8 : 0000000000000018 x7 : 4e5241575f534b43 x6 : ffff8000804a69fc x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008047cc34 x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000 Call trace: check_wait_context kernel/locking/lockdep.c:4850 [inline] (P) __lock_acquire+0x574/0x7904 kernel/locking/lockdep.c:5176 (P) lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5849 __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:59 netpoll_poll_disable+0xe8/0x100 net/core/netpoll.c:222 __dev_close_many+0x104/0x3c8 net/core/dev.c:1532 dev_close_many+0x1e0/0x474 net/core/dev.c:1585 unregister_netdevice_many_notify+0x454/0x1c6c net/core/dev.c:11502 unregister_netdevice_many+0x28/0x38 net/core/dev.c:11592 cleanup_net+0x5c8/0xa34 net/core/net_namespace.c:643 process_one_work+0x7a8/0x15cc kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x97c/0xeec kernel/workqueue.c:3391 kthread+0x288/0x310 kernel/kthread.c:389 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