------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 1 PID: 3064 at kernel/locking/lockdep.c:231 check_wait_context kernel/locking/lockdep.c:4727 [inline] WARNING: CPU: 1 PID: 3064 at kernel/locking/lockdep.c:231 __lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003 Modules linked in: CPU: 1 PID: 3064 Comm: syz-executor.2 Not tainted 6.0.0-rc6-syzkaller-17727-gaa49f95768a9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4727 [inline] pc : __lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003 lr : hlock_class kernel/locking/lockdep.c:231 [inline] lr : check_wait_context kernel/locking/lockdep.c:4727 [inline] lr : __lock_acquire+0x298/0x30a4 kernel/locking/lockdep.c:5003 sp : ffff80001281b720 x29: ffff80001281b800 x28: 0000000000000001 x27: ffff0000ccb7cfa8 x26: ffff0000fb585578 x25: ffff0000ccb7d9d8 x24: 0000000000000000 x23: 0000000000000000 x22: 0000000000000001 x21: 0000000000000000 x20: 0000000000000000 x19: aaaaaa00013cd90a x18: 0000000000000035 x17: 0000000000000008 x16: ffff80000db59158 x15: ffff0000ccb7cf80 x14: 0000000000000000 x13: 0000000000000012 x12: ffff80000d5ff920 x11: ff808000081c30a4 x10: ffff80000dd1b198 x9 : fe05af66d7e42700 x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff8000081976e4 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000001 x0 : 0000000000000016 Call trace: check_wait_context kernel/locking/lockdep.c:4727 [inline] __lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 __mutex_lock_common+0xd4/0xca8 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 tee_netdev_event+0x54/0x1a8 net/netfilter/xt_TEE.c:68 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0x7c/0x108 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1945 [inline] call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] netdev_wait_allrefs_any net/core/dev.c:10250 [inline] netdev_run_todo+0x340/0x6f0 net/core/dev.c:10364 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147 tun_detach drivers/net/tun.c:704 [inline] tun_chr_close+0xe8/0xfc drivers/net/tun.c:3455 __fput+0x198/0x3dc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:353 task_work_run+0xc4/0x14c kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x26c/0xbe0 kernel/exit.c:795 do_group_exit+0x70/0xe8 kernel/exit.c:925 get_signal+0xb0c/0xb40 kernel/signal.c:2857 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 irq event stamp: 5851069 hardirqs last enabled at (5851069): [] __local_bh_enable_ip+0x13c/0x1a4 kernel/softirq.c:401 hardirqs last disabled at (5851067): [] __local_bh_enable_ip+0xc4/0x1a4 kernel/softirq.c:378 softirqs last enabled at (5851068): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (5851068): [] rt_flush_dev+0x32c/0x374 net/ipv4/route.c:1557 softirqs last disabled at (5851066): [] spin_lock_bh include/linux/spinlock.h:354 [inline] softirqs last disabled at (5851066): [] rt_flush_dev+0x114/0x374 net/ipv4/route.c:1548 ---[ end trace 0000000000000000 ]--- Unable to handle kernel NULL pointer dereference at virtual address 00000000000000b8 Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=00000001440db000 [00000000000000b8] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 3064 Comm: syz-executor.2 Tainted: G W 6.0.0-rc6-syzkaller-17727-gaa49f95768a9 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4727 [inline] pc : __lock_acquire+0x2d0/0x30a4 kernel/locking/lockdep.c:5003 lr : hlock_class kernel/locking/lockdep.c:231 [inline] lr : check_wait_context kernel/locking/lockdep.c:4727 [inline] lr : __lock_acquire+0x298/0x30a4 kernel/locking/lockdep.c:5003 sp : ffff80001281b720 x29: ffff80001281b800 x28: 0000000000000001 x27: ffff0000ccb7cfa8 x26: ffff0000fb585578 x25: ffff0000ccb7d9d8 x24: 0000000000000000 x23: 0000000000000000 x22: 0000000000000001 x21: 0000000000000000 x20: 0000000000000000 x19: aaaaaa00013cd90a x18: 0000000000000035 x17: 0000000000000008 x16: ffff80000db59158 x15: ffff0000ccb7cf80 x14: 0000000000000000 x13: 0000000000000012 x12: ffff80000d5ff920 x11: ff808000081c30a4 x10: ffff80000dd1b198 x9 : 000000000004190a x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff8000081976e4 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000001 x0 : 0000000000000016 Call trace: hlock_class kernel/locking/lockdep.c:222 [inline] check_wait_context kernel/locking/lockdep.c:4728 [inline] __lock_acquire+0x2d0/0x30a4 kernel/locking/lockdep.c:5003 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 __mutex_lock_common+0xd4/0xca8 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 tee_netdev_event+0x54/0x1a8 net/netfilter/xt_TEE.c:68 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0x7c/0x108 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1945 [inline] call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] netdev_wait_allrefs_any net/core/dev.c:10250 [inline] netdev_run_todo+0x340/0x6f0 net/core/dev.c:10364 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147 tun_detach drivers/net/tun.c:704 [inline] tun_chr_close+0xe8/0xfc drivers/net/tun.c:3455 __fput+0x198/0x3dc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:353 task_work_run+0xc4/0x14c kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x26c/0xbe0 kernel/exit.c:795 do_group_exit+0x70/0xe8 kernel/exit.c:925 get_signal+0xb0c/0xb40 kernel/signal.c:2857 do_signal+0x128/0x438 arch/arm64/kernel/signal.c:1071 do_notify_resume+0xc0/0x1f0 arch/arm64/kernel/signal.c:1124 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 Code: f002dbea 91056210 9106614a b9400329 (3942e114) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f002dbea adrp x10, 0x5b7f000 4: 91056210 add x16, x16, #0x158 8: 9106614a add x10, x10, #0x198 c: b9400329 ldr w9, [x25] * 10: 3942e114 ldrb w20, [x8, #184] <-- trapping instruction