================================ WARNING: inconsistent lock state 5.12.0-rc5-syzkaller #0 Not tainted -------------------------------- inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage. syz-executor.5/5934 [HC0[0]:SC0[0]:HE1:SE1] takes: ffff88804b9d90a0 (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff88804b9d90a0 (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}-{2:2}, at: sco_conn_del+0x134/0x2b0 net/bluetooth/sco.c:176 {IN-SOFTIRQ-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] sco_sock_timeout+0x33/0x1b0 net/bluetooth/sco.c:83 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1476 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758 __do_softirq+0x29b/0x9f6 kernel/softirq.c:345 invoke_softirq kernel/softirq.c:221 [inline] __irq_exit_rcu kernel/softirq.c:422 [inline] irq_exit_rcu+0x134/0x200 kernel/softirq.c:434 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 check_preemption_disabled+0x3e/0x150 lib/smp_processor_id.c:60 rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1217 [inline] rcu_lockdep_current_cpu_online+0x2d/0x150 kernel/rcu/tree.c:1208 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline] rcu_read_lock_held_common kernel/rcu/update.c:102 [inline] rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123 trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x5d3/0x720 kernel/locking/lockdep.c:5521 __might_fault mm/memory.c:5021 [inline] __might_fault+0x144/0x180 mm/memory.c:5006 strncpy_from_user+0x2f/0x3e0 lib/strncpy_from_user.c:117 getname_flags.part.0+0x95/0x4f0 fs/namei.c:149 getname_flags include/linux/audit.h:319 [inline] getname fs/namei.c:209 [inline] __do_sys_unlink fs/namei.c:4143 [inline] __se_sys_unlink fs/namei.c:4141 [inline] __x64_sys_unlink+0xb1/0x100 fs/namei.c:4141 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae irq event stamp: 3169 hardirqs last enabled at (3169): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (3169): [] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:199 hardirqs last disabled at (3168): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (3168): [] _raw_spin_lock_irq+0x41/0x50 kernel/locking/spinlock.c:167 softirqs last enabled at (2868): [] invoke_softirq kernel/softirq.c:221 [inline] softirqs last enabled at (2868): [] __irq_exit_rcu kernel/softirq.c:422 [inline] softirqs last enabled at (2868): [] irq_exit_rcu+0x134/0x200 kernel/softirq.c:434 softirqs last disabled at (2565): [] invoke_softirq kernel/softirq.c:221 [inline] softirqs last disabled at (2565): [] __irq_exit_rcu kernel/softirq.c:422 [inline] softirqs last disabled at (2565): [] irq_exit_rcu+0x134/0x200 kernel/softirq.c:434 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-executor.5/5934: #0: ffff88802b78cf48 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close+0x111/0x1110 net/bluetooth/hci_core.c:1728 #1: ffff88802b78c078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_do_close+0x26f/0x1110 net/bluetooth/hci_core.c:1765 #2: ffffffff8d874bc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1483 [inline] #2: ffffffff8d874bc8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xda/0x260 net/bluetooth/hci_conn.c:1598 stack backtrace: CPU: 1 PID: 5934 Comm: syz-executor.5 Not tainted 5.12.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 print_usage_bug kernel/locking/lockdep.c:202 [inline] valid_state kernel/locking/lockdep.c:3818 [inline] mark_lock_irq kernel/locking/lockdep.c:4021 [inline] mark_lock.cold+0x61/0x8e kernel/locking/lockdep.c:4478 mark_usage kernel/locking/lockdep.c:4391 [inline] __lock_acquire+0x885/0x54c0 kernel/locking/lockdep.c:4854 lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] sco_conn_del+0x134/0x2b0 net/bluetooth/sco.c:176 sco_disconn_cfm+0x74/0xb0 net/bluetooth/sco.c:1189 hci_disconn_cfm include/net/bluetooth/hci_core.h:1486 [inline] hci_conn_hash_flush+0x127/0x260 net/bluetooth/hci_conn.c:1598 hci_dev_do_close+0x569/0x1110 net/bluetooth/hci_core.c:1778 hci_unregister_dev+0x263/0x1130 net/bluetooth/hci_core.c:3989 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:340 __fput+0x288/0x920 fs/file_table.c:280 task_work_run+0xdd/0x1a0 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xbfc/0x2a60 kernel/exit.c:825 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2150 kernel/signal.c:2781 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 Code: Unable to access opcode bytes at RIP 0x46642f. RSP: 002b:00007fac124a8218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000056bf68 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf68 RBP: 000000000056bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf6c R13: 00007fff8f1ceb5f R14: 00007fac124a8300 R15: 0000000000022000