================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.3.166/5216 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88807040c648 ((work_completion)(&(&host->detect)->work)){+.?.}-{0:0}, at: __flush_work+0x109/0xac0 kernel/workqueue.c:3072 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5678 process_one_work+0x7ec/0x1160 kernel/workqueue.c:2268 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 irq event stamp: 4594 hardirqs last enabled at (4594): [] __cancel_work_timer+0x36a/0x560 kernel/workqueue.c:3156 hardirqs last disabled at (4593): [] try_to_grab_pending+0xfa/0x890 kernel/workqueue.c:1267 softirqs last enabled at (4030): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last enabled at (4030): [] netif_tx_lock_bh include/linux/netdevice.h:4425 [inline] softirqs last enabled at (4030): [] dev_watchdog_down net/sched/sch_generic.c:576 [inline] softirqs last enabled at (4030): [] dev_deactivate_many+0x242/0xcd0 net/sched/sch_generic.c:1338 softirqs last disabled at (4031): [] do_softirq+0x142/0x210 kernel/softirq.c:497 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock((work_completion)(&(&host->detect)->work)); lock((work_completion)(&(&host->detect)->work)); *** DEADLOCK *** 2 locks held by syz.3.166/5216: #0: ffffffff8dd550a8 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff8dd550a8 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3d/0x1b0 drivers/net/tun.c:3506 #1: ffffc90000007c80 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0xcf/0x670 kernel/time/timer.c:1698 stack backtrace: CPU: 0 PID: 5216 Comm: syz.3.166 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 valid_state+0x13b/0x1d0 kernel/locking/lockdep.c:3974 mark_lock_irq+0xa9/0x900 kernel/locking/lockdep.c:4177 mark_lock+0x208/0x320 kernel/locking/lockdep.c:4633 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0xce0/0x7c40 kernel/locking/lockdep.c:5017 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5678 __flush_work+0x122/0xac0 kernel/workqueue.c:3072 __cancel_work_timer+0x3f4/0x560 kernel/workqueue.c:3163 mmc_free_host+0x15/0x30 drivers/mmc/core/host.c:672 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x291/0x910 kernel/softirq.c:596 do_softirq+0x142/0x210 kernel/softirq.c:497 __local_bh_enable_ip+0x180/0x1c0 kernel/softirq.c:421 local_bh_enable include/linux/bottom_half.h:33 [inline] netif_tx_unlock_bh include/linux/netdevice.h:4434 [inline] dev_watchdog_down net/sched/sch_generic.c:579 [inline] dev_deactivate_many+0x533/0xcd0 net/sched/sch_generic.c:1338 __dev_close_many+0x162/0x2b0 net/core/dev.c:1572 dev_close_many+0x21c/0x400 net/core/dev.c:1610 unregister_netdevice_many_notify+0x497/0x1990 net/core/dev.c:10997 unregister_netdevice_many net/core/dev.c:11077 [inline] unregister_netdevice_queue+0x2e5/0x330 net/core/dev.c:10960 unregister_netdevice include/linux/netdevice.h:3077 [inline] __tun_detach+0xdb7/0x1590 drivers/net/tun.c:685 tun_detach drivers/net/tun.c:701 [inline] tun_chr_close+0x109/0x1b0 drivers/net/tun.c:3506 __fput+0x20a/0x8b0 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213 __syscall_exit_to_user_mode_work kernel/entry/common.c:295 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:306 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff58799e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe68851d28 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffe68851e10 RCX: 00007ff58799e159 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000002278e R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b2ef20000 R11: 0000000000000246 R12: 00007ffe68851e50 R13: 00007ff587c25fac R14: 00000000000227ff R15: 00007ff587c25fa0 BUG: sleeping function called from invalid context at kernel/workqueue.c:3013 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5216, name: syz.3.166 preempt_count: 101, expected: 0 RCU nest depth: 0, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [] local_bh_disable include/linux/bottom_half.h:20 [inline] [] netif_tx_lock_bh include/linux/netdevice.h:4425 [inline] [] dev_watchdog_down net/sched/sch_generic.c:576 [inline] [] dev_deactivate_many+0x251/0xcd0 net/sched/sch_generic.c:1338 CPU: 0 PID: 5216 Comm: syz.3.166 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 __might_resched+0x489/0x5f0 kernel/sched/core.c:9970 start_flush_work kernel/workqueue.c:3013 [inline] __flush_work+0x142/0xac0 kernel/workqueue.c:3075 __cancel_work_timer+0x3f4/0x560 kernel/workqueue.c:3163 mmc_free_host+0x15/0x30 drivers/mmc/core/host.c:672 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x291/0x910 kernel/softirq.c:596 do_softirq+0x142/0x210 kernel/softirq.c:497 __local_bh_enable_ip+0x180/0x1c0 kernel/softirq.c:421 local_bh_enable include/linux/bottom_half.h:33 [inline] netif_tx_unlock_bh include/linux/netdevice.h:4434 [inline] dev_watchdog_down net/sched/sch_generic.c:579 [inline] dev_deactivate_many+0x533/0xcd0 net/sched/sch_generic.c:1338 __dev_close_many+0x162/0x2b0 net/core/dev.c:1572 dev_close_many+0x21c/0x400 net/core/dev.c:1610 unregister_netdevice_many_notify+0x497/0x1990 net/core/dev.c:10997 unregister_netdevice_many net/core/dev.c:11077 [inline] unregister_netdevice_queue+0x2e5/0x330 net/core/dev.c:10960 unregister_netdevice include/linux/netdevice.h:3077 [inline] __tun_detach+0xdb7/0x1590 drivers/net/tun.c:685 tun_detach drivers/net/tun.c:701 [inline] tun_chr_close+0x109/0x1b0 drivers/net/tun.c:3506 __fput+0x20a/0x8b0 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213 __syscall_exit_to_user_mode_work kernel/entry/common.c:295 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:306 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff58799e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe68851d28 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffe68851e10 RCX: 00007ff58799e159 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000002278e R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b2ef20000 R11: 0000000000000246 R12: 00007ffe68851e50 R13: 00007ff587c25fac R14: 00000000000227ff R15: 00007ff587c25fa0 ODEBUG: object ffffc90000007a60 is NOT on stack ffffc9000e5b0000, but annotated. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5216 at lib/debugobjects.c:558 debug_object_is_on_stack lib/debugobjects.c:-1 [inline] WARNING: CPU: 0 PID: 5216 at lib/debugobjects.c:558 lookup_object_or_alloc lib/debugobjects.c:591 [inline] WARNING: CPU: 0 PID: 5216 at lib/debugobjects.c:558 __debug_object_init+0x18e/0x440 lib/debugobjects.c:672 Modules linked in: CPU: 0 PID: 5216 Comm: syz.3.166 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:debug_object_is_on_stack lib/debugobjects.c:558 [inline] RIP: 0010:lookup_object_or_alloc lib/debugobjects.c:591 [inline] RIP: 0010:__debug_object_init+0x18e/0x440 lib/debugobjects.c:672 Code: 24 04 74 2f 41 ff c6 44 89 35 7e 6a dd 12 48 c7 c1 40 71 df 8a 48 c7 c7 a0 71 df 8a 84 c0 48 0f 45 f9 48 89 de e8 f2 b9 0c 06 <0f> 0b eb 05 4c 8b 7c 24 18 4d 8d 65 10 4d 89 e6 49 c1 ee 03 41 0f RSP: 0018:ffffc900000079c8 EFLAGS: 00010046 RAX: 0000000000000050 RBX: ffffc90000007a60 RCX: 839d10e2f214d300 RDX: 0000000000000100 RSI: 0000000000000102 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffc90000007647 R09: 1ffff92000000ec8 R10: dffffc0000000000 R11: fffff52000000ec9 R12: ffff88802ca43c20 R13: ffff888017771a80 R14: 0000000000000001 R15: ffffffff8a8d3120 FS: 000055555bf3d500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000140 CR3: 000000005283b000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __synchronize_srcu+0x227/0x350 kernel/rcu/srcutree.c:1241 wakeup_source_remove drivers/base/power/wakeup.c:198 [inline] wakeup_source_unregister+0x112/0x190 drivers/base/power/wakeup.c:242 mmc_host_classdev_release+0x43/0xf0 drivers/mmc/core/host.c:77 device_release+0x92/0x1c0 drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x217/0x450 lib/kobject.c:729 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x56c/0x810 kernel/time/timer.c:2023 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x291/0x910 kernel/softirq.c:596 do_softirq+0x142/0x210 kernel/softirq.c:497 __local_bh_enable_ip+0x180/0x1c0 kernel/softirq.c:421 local_bh_enable include/linux/bottom_half.h:33 [inline] netif_tx_unlock_bh include/linux/netdevice.h:4434 [inline] dev_watchdog_down net/sched/sch_generic.c:579 [inline] dev_deactivate_many+0x533/0xcd0 net/sched/sch_generic.c:1338 __dev_close_many+0x162/0x2b0 net/core/dev.c:1572 dev_close_many+0x21c/0x400 net/core/dev.c:1610 unregister_netdevice_many_notify+0x497/0x1990 net/core/dev.c:10997 unregister_netdevice_many net/core/dev.c:11077 [inline] unregister_netdevice_queue+0x2e5/0x330 net/core/dev.c:10960 unregister_netdevice include/linux/netdevice.h:3077 [inline] __tun_detach+0xdb7/0x1590 drivers/net/tun.c:685 tun_detach drivers/net/tun.c:701 [inline] tun_chr_close+0x109/0x1b0 drivers/net/tun.c:3506 __fput+0x20a/0x8b0 fs/file_table.c:320 task_work_run+0x1d0/0x260 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213 __syscall_exit_to_user_mode_work kernel/entry/common.c:295 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:306 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff58799e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe68851d28 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007ffe68851e10 RCX: 00007ff58799e159 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 000000000002278e R08: 0000000000000001 R09: 0000000000000000 R10: 0000001b2ef20000 R11: 0000000000000246 R12: 00007ffe68851e50 R13: 00007ff587c25fac R14: 00000000000227ff R15: 00007ff587c25fa0