bridge0: port 1(bridge_slave_0) entered disabled state ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 1 PID: 137 at kernel/locking/lockdep.c:231 check_wait_context kernel/locking/lockdep.c:4772 [inline] WARNING: CPU: 1 PID: 137 at kernel/locking/lockdep.c:231 __lock_acquire+0x78c/0x779c kernel/locking/lockdep.c:5092 Modules linked in: CPU: 1 UID: 0 PID: 137 Comm: kworker/u8:4 Not tainted 6.11.0-rc3-syzkaller-g5c43d43bad35 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: netns cleanup_net pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4772 [inline] pc : __lock_acquire+0x78c/0x779c kernel/locking/lockdep.c:5092 lr : hlock_class kernel/locking/lockdep.c:231 [inline] lr : check_wait_context kernel/locking/lockdep.c:4772 [inline] lr : __lock_acquire+0x780/0x779c kernel/locking/lockdep.c:5092 sp : ffff8000982f7060 x29: ffff8000982f7320 x28: ffff0000c5f83c80 x27: ffff0000c5f847e8 x26: 1fffe00018bf08fd x25: ffff800092cb4500 x24: 0000000000000001 x23: ffff0000c5f846f8 x22: ffff0000c5f847c8 x21: ffff0000c5f847ec x20: 0000000000001e95 x19: ffff800092cb48d0 x18: ffff8000982f6798 x17: 0000000000000000 x16: ffff80008029a3e4 x15: 0000000000000001 x14: 1ffff00011edc650 x13: dfff800000000000 x12: 0000000000000000 x11: 0000000000000003 x10: 0000000000ff0100 x9 : e5dbd8c3b21ec100 x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff800080385e68 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008035e5d4 x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000 Call trace: check_wait_context kernel/locking/lockdep.c:4772 [inline] __lock_acquire+0x78c/0x779c kernel/locking/lockdep.c:5092 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759 __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+0xec/0x1b0 net/core/netpoll.c:228 __dev_close_many+0x104/0x3c8 net/core/dev.c:1530 dev_close_many+0x1e0/0x474 net/core/dev.c:1583 unregister_netdevice_many_notify+0x460/0x1bc0 net/core/dev.c:11319 unregister_netdevice_many+0x28/0x38 net/core/dev.c:11406 cleanup_net+0x5c8/0x9b4 net/core/net_namespace.c:635 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x938/0xebc kernel/workqueue.c:3390 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 irq event stamp: 748420 hardirqs last enabled at (748419): [] __local_bh_enable_ip+0x224/0x44c kernel/softirq.c:387 hardirqs last disabled at (748420): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (748420): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (748418): [] pppoe_flush_dev drivers/net/ppp/pppoe.c:327 [inline] softirqs last enabled at (748418): [] pppoe_device_event+0x464/0x4a0 drivers/net/ppp/pppoe.c:346 softirqs last disabled at (748416): [] pppoe_flush_dev drivers/net/ppp/pppoe.c:279 [inline] softirqs last disabled at (748416): [] 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: 1 UID: 0 PID: 137 Comm: kworker/u8:4 Tainted: G W 6.11.0-rc3-syzkaller-g5c43d43bad35 #0 Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Workqueue: netns cleanup_net pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4772 [inline] pc : __lock_acquire+0x574/0x779c kernel/locking/lockdep.c:5092 lr : hlock_class kernel/locking/lockdep.c:231 [inline] lr : check_wait_context kernel/locking/lockdep.c:4772 [inline] lr : __lock_acquire+0x780/0x779c kernel/locking/lockdep.c:5092 sp : ffff8000982f7060 x29: ffff8000982f7320 x28: ffff0000c5f83c80 x27: ffff0000c5f847e8 x26: 1fffe00018bf08fd x25: ffff800092cb4500 x24: 0000000000000001 x23: ffff0000c5f846f8 x22: ffff0000c5f847c8 x21: 00000000000000c4 x20: 0000000000001e95 x19: ffff800092cb48d0 x18: ffff8000982f6798 x17: 0000000000000000 x16: ffff80008029a3e4 x15: 0000000000000001 x14: 1ffff00011edc650 x13: dfff800000000000 x12: 0000000000000000 x11: 0000000000000003 x10: 0000000000ff0100 x9 : e5dbd8c3b21ec100 x8 : 0000000000000018 x7 : 4e5241575f534b43 x6 : ffff800080385e68 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008035e5d4 x2 : 0000000000000001 x1 : 0000000100000001 x0 : 0000000000000000 Call trace: check_wait_context kernel/locking/lockdep.c:4772 [inline] __lock_acquire+0x574/0x779c kernel/locking/lockdep.c:5092 lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5759 __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+0xec/0x1b0 net/core/netpoll.c:228 __dev_close_many+0x104/0x3c8 net/core/dev.c:1530 dev_close_many+0x1e0/0x474 net/core/dev.c:1583 unregister_netdevice_many_notify+0x460/0x1bc0 net/core/dev.c:11319 unregister_netdevice_many+0x28/0x38 net/core/dev.c:11406 cleanup_net+0x5c8/0x9b4 net/core/net_namespace.c:635 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x938/0xebc kernel/workqueue.c:3390 kthread+0x288/0x310 kernel/kthread.c:389 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Code: 34000e88 aa1f03e8 91031115 d343fea8 (38ed6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 34000e88 cbz w8, 0x1d0 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