================================ WARNING: inconsistent lock state 4.14.196-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor983/6374 [HC0[0]:SC1[1]:HE1:SE0] takes: (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}, at: [] spin_lock include/linux/spinlock.h:317 [inline] (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}, at: [] sco_sock_timeout+0x1a/0x150 net/bluetooth/sco.c:82 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] sco_conn_del+0xb0/0x1e0 net/bluetooth/sco.c:175 sco_disconn_cfm net/bluetooth/sco.c:1134 [inline] sco_disconn_cfm+0x50/0x60 net/bluetooth/sco.c:1127 hci_disconn_cfm include/net/bluetooth/hci_core.h:1226 [inline] hci_conn_hash_flush+0x114/0x220 net/bluetooth/hci_conn.c:1376 hci_dev_do_close+0x542/0xc50 net/bluetooth/hci_core.c:1620 hci_unregister_dev+0x170/0x7a0 net/bluetooth/hci_core.c:3191 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:354 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xa08/0x27f0 kernel/exit.c:865 do_group_exit+0x100/0x2e0 kernel/exit.c:962 get_signal+0x38d/0x1ca0 kernel/signal.c:2423 do_signal+0x7c/0x1550 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x160/0x200 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb irq event stamp: 40307810 hardirqs last enabled at (40307810): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (40307810): [] _raw_spin_unlock_irq+0x24/0x80 kernel/locking/spinlock.c:200 hardirqs last disabled at (40307809): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (40307809): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:168 softirqs last enabled at (40293892): [] __do_softirq+0x6ab/0xa1d kernel/softirq.c:314 softirqs last disabled at (40307807): [] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (40307807): [] irq_exit+0x193/0x240 kernel/softirq.c:409 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(slock-AF_BLUETOOTH-BTPROTO_SCO); lock(slock-AF_BLUETOOTH-BTPROTO_SCO); *** DEADLOCK *** 3 locks held by syz-executor983/6374: #0: (sb_writers#3){.+.+}, at: [] sb_start_write include/linux/fs.h:1549 [inline] #0: (sb_writers#3){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&type->i_mutex_dir_key#3/1){+.+.}, at: [] inode_lock_nested include/linux/fs.h:754 [inline] #1: (&type->i_mutex_dir_key#3/1){+.+.}, at: [] filename_create+0x12a/0x3f0 fs/namei.c:3674 #2: (((&sk->sk_timer))){+.-.}, at: [] lockdep_copy_map include/linux/lockdep.h:174 [inline] #2: (((&sk->sk_timer))){+.-.}, at: [] call_timer_fn+0xb8/0x650 kernel/time/timer.c:1270 stack backtrace: CPU: 1 PID: 6374 Comm: syz-executor983 Not tainted 4.14.196-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 print_usage_bug.cold+0x42e/0x570 kernel/locking/lockdep.c:2589 valid_state kernel/locking/lockdep.c:2602 [inline] mark_lock_irq kernel/locking/lockdep.c:2796 [inline] mark_lock+0xb4d/0x1050 kernel/locking/lockdep.c:3194 mark_irqflags kernel/locking/lockdep.c:3072 [inline] __lock_acquire+0xc81/0x3f20 kernel/locking/lockdep.c:3448 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:152 spin_lock include/linux/spinlock.h:317 [inline] sco_sock_timeout+0x1a/0x150 net/bluetooth/sco.c:82 call_timer_fn+0x14a/0x650 kernel/time/timer.c:1280 expire_timers+0x232/0x4d0 kernel/time/timer.c:1319 __run_timers kernel/time/timer.c:1644 [inline] run_timer_softirq+0x1d5/0x5a0 kernel/time/timer.c:1657 __do_softirq+0x254/0xa1d kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x193/0x240 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline] RIP: 0010:lock_release+0x41e/0x870 kernel/locking/lockdep.c:4020 RSP: 0018:ffff88809697fa10 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 RAX: 1ffffffff0fa2d21 RBX: 1ffff11012d2ff45 RCX: 1ffff11012dc2973 RDX: dffffc0000000000 RSI: 0000000000000003 RDI: 0000000000000286 RBP: ffff888096e142c0 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: ffff888096e142c0 R12: de2f78af65fdc14a R13: 0000000000000003 R14: ffff888096e142c0 R15: 0000000000000003 rcu_lock_release include/linux/rcupdate.h:247 [inline] rcu_read_unlock include/linux/rcupdate.h:685 [inline] ext4_get_group_desc+0x1b0/0x430 fs/ext4/balloc.c:294 recently_deleted fs/ext4/ialloc.c:689 [inline] find_inode_bit+0x18b/0x4e0 fs/ext4/ialloc.c:733 __ext4_new_inode+0x1379/0x4eb0 fs/ext4/ialloc.c:925 ext4_mkdir+0x2e4/0xba0 fs/ext4/namei.c:2675 vfs_mkdir+0x463/0x6e0 fs/namei.c:3849 SYSC_mkdirat fs/namei.c:3872 [inline] SyS_mkdirat+0x1fd/0x270 fs/namei.c:3856 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x44a477 RSP: 002b:00007ffdb1d22a78 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00000000001abc43 RCX: 000000000044a477 RDX: 00007ffdb1d22af6 RSI: 00000000000001ff RDI: 00007ffdb1d22af0 RBP: 0000000000002ed3 R08: 0000000000000000 R09: 0000000000000006 R10: 0000000000000064 R11: 0000000000000206 R12: 0000000000000f56 R13: 000000000040bb20 R14: 0000000000000000 R15: 0000000000000000