================================ WARNING: inconsistent lock state 6.0.0-rc4-syzkaller-17255-ga6b443748715 #0 Not tainted -------------------------------- inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage. syz-executor.2/14343 [HC0[0]:SC0[0]:HE1:SE1] takes: ffff0000fc177978 ((&llc->ack_timer.timer)){+.?.}-{0:0}, at: tee_netdev_event+0x54/0x1a8 net/netfilter/xt_TEE.c:68 {IN-SOFTIRQ-W} state was registered at: lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 call_timer_fn+0x7c/0x144 kernel/time/timer.c:1471 expire_timers kernel/time/timer.c:1519 [inline] __run_timers+0x280/0x374 kernel/time/timer.c:1790 run_timer_softirq+0x34/0x5c kernel/time/timer.c:1803 _stext+0x168/0x37c run_ksoftirqd+0x4c/0x21c kernel/softirq.c:934 smpboot_thread_fn+0x248/0x3e4 kernel/smpboot.c:164 kthread+0x12c/0x158 kernel/kthread.c:376 ret_from_fork+0x10/0x20 irq event stamp: 50429 hardirqs last enabled at (50429): [] __local_bh_enable_ip+0x13c/0x1a4 kernel/softirq.c:401 hardirqs last disabled at (50427): [] __local_bh_enable_ip+0xc4/0x1a4 kernel/softirq.c:378 softirqs last enabled at (50428): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (50428): [] rt_flush_dev+0x32c/0x374 net/ipv4/route.c:1557 softirqs last disabled at (50426): [] spin_lock_bh include/linux/spinlock.h:354 [inline] softirqs last disabled at (50426): [] rt_flush_dev+0x114/0x374 net/ipv4/route.c:1548 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock((&llc->ack_timer.timer)); lock((&llc->ack_timer.timer)); *** DEADLOCK *** 1 lock held by syz-executor.2/14343: #0: ffff80000d81a928 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 stack backtrace: CPU: 1 PID: 14343 Comm: syz-executor.2 Not tainted 6.0.0-rc4-syzkaller-17255-ga6b443748715 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_usage_bug+0x39c/0x3cc kernel/locking/lockdep.c:3961 mark_lock_irq+0x4a8/0x4b4 mark_lock+0x154/0x1b4 kernel/locking/lockdep.c:4632 __lock_acquire+0x618/0x30a4 kernel/locking/lockdep.c:5007 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:625 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 14343 at net/ipv6/ip6_fib.c:2068 fib6_walk_continue+0x278/0x2b0 net/ipv6/ip6_fib.c:2068 Modules linked in: CPU: 1 PID: 14343 Comm: syz-executor.2 Not tainted 6.0.0-rc4-syzkaller-17255-ga6b443748715 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : fib6_walk_continue+0x278/0x2b0 net/ipv6/ip6_fib.c:2068 lr : fib6_walk_continue+0x278/0x2b0 net/ipv6/ip6_fib.c:2068 sp : ffff800014543790 x29: ffff800014543790 x28: 0000000000000000 x27: ffff0000fc263800 x26: ffff0000f8662510 x25: ffff0000fc263818 x24: ffff0000f8662510 x23: ffff0000f8662520 x22: ffff0000f8661a80 x21: ffff80000b773830 x20: 0000000000000000 x19: ffff8000145437f8 x18: 0000000000000071 x17: 6e69676e45206574 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000015 x12: ffff80000d8511f0 x11: ff8080000b78751c x10: 0000000000000000 x9 : ffff80000b78751c x8 : ffff0000f5be4f80 x7 : 545b5d3730373135 x6 : ffff80000b785d78 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0000f5be4f80 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: fib6_walk_continue+0x278/0x2b0 net/ipv6/ip6_fib.c:2068 fib6_walk net/ipv6/ip6_fib.c:2161 [inline] fib6_clean_tree net/ipv6/ip6_fib.c:2241 [inline] __fib6_clean_all+0x16c/0x2c4 net/ipv6/ip6_fib.c:2257 fib6_clean_all+0x3c/0x50 net/ipv6/ip6_fib.c:2268 rt6_sync_down_dev net/ipv6/route.c:4894 [inline] rt6_disable_ip+0x80/0xc8 net/ipv6/route.c:4899 addrconf_ifdown+0x90/0xc30 net/ipv6/addrconf.c:3746 addrconf_notify+0x234/0x7f0 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:625 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 irq event stamp: 50429 hardirqs last enabled at (50429): [] __local_bh_enable_ip+0x13c/0x1a4 kernel/softirq.c:401 hardirqs last disabled at (50427): [] __local_bh_enable_ip+0xc4/0x1a4 kernel/softirq.c:378 softirqs last enabled at (50428): [] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (50428): [] rt_flush_dev+0x32c/0x374 net/ipv4/route.c:1557 softirqs last disabled at (50426): [] spin_lock_bh include/linux/spinlock.h:354 [inline] softirqs last disabled at (50426): [] rt_flush_dev+0x114/0x374 net/ipv4/route.c:1548 ---[ end trace 0000000000000000 ]--- Unable to handle kernel NULL pointer dereference at virtual address 00000000000001a0 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 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=0000000140d86000 [00000000000001a0] pgd=0800000143390003, p4d=0800000143390003, pud=0000000000000000 Internal error: Oops: 96000005 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 14343 Comm: syz-executor.2 Tainted: G W 6.0.0-rc4-syzkaller-17255-ga6b443748715 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : nf_tables_flowtable_event+0x74/0x1bc lr : nf_tables_flowtable_event+0x60/0x1bc net/netfilter/nf_tables_api.c:8158 sp : ffff8000145439e0 x29: ffff8000145439e0 x28: ffff0000fc40c5a0 x27: ffff800014543aa8 x26: ffff80000d839160 x25: 0000000000000001 x24: dead000000000122 x23: 0000000000000000 x22: ffff0000fc40c000 x21: 0000000000000006 x20: ffff0000fc177700 x19: ffff0000fc177740 x18: 00000000000001f7 x17: ffff80000c00d6bc x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 000000000000000b x12: ffff80000d838730 x11: ff808000095a2e3c x10: ffff80000d339358 x9 : 0aa49d18a90bda00 x8 : 0aa49d18a90bda00 x7 : 0000000000000000 x6 : ffff80000b4762fc x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : ffff0000f5be4f80 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: nf_tables_flowtable_event+0x74/0x1bc 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:625 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 Code: eb1402ff 54000920 d2802458 f2fbd5b8 (f940d2f9) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: eb1402ff cmp x23, x20 4: 54000920 b.eq 0x128 // b.none 8: d2802458 mov x24, #0x122 // #290 c: f2fbd5b8 movk x24, #0xdead, lsl #48 * 10: f940d2f9 ldr x25, [x23, #416] <-- trapping instruction