================================ WARNING: inconsistent lock state 5.9.0-rc1-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor878/16778 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff8880a2ec00a0 (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffff8880a2ec00a0 (slock-AF_BLUETOOTH-BTPROTO_SCO){+.?.}-{2:2}, at: sco_sock_timeout+0x24/0x140 net/bluetooth/sco.c:83 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:5005 __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+0x128/0x270 net/bluetooth/sco.c:176 sco_disconn_cfm net/bluetooth/sco.c:1178 [inline] sco_disconn_cfm+0x62/0x80 net/bluetooth/sco.c:1171 hci_disconn_cfm include/net/bluetooth/hci_core.h:1438 [inline] hci_conn_hash_flush+0x114/0x220 net/bluetooth/hci_conn.c:1557 hci_dev_do_close+0x5c6/0x1080 net/bluetooth/hci_core.c:1770 hci_unregister_dev+0x1bd/0xe30 net/bluetooth/hci_core.c:3790 vhci_release+0x70/0xe0 drivers/bluetooth/hci_vhci.c:340 __fput+0x285/0x920 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:141 exit_task_work include/linux/task_work.h:25 [inline] do_exit+0xb7d/0x29f0 kernel/exit.c:806 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x428/0x1f00 kernel/signal.c:2757 arch_do_signal+0x82/0x2520 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:135 [inline] exit_to_user_mode_prepare+0x15d/0x1c0 kernel/entry/common.c:166 syscall_exit_to_user_mode+0x59/0x2b0 kernel/entry/common.c:241 entry_SYSCALL_64_after_hwframe+0x44/0xa9 irq event stamp: 336 hardirqs last enabled at (336): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (336): [] _raw_spin_unlock_irq+0x1f/0x80 kernel/locking/spinlock.c:199 hardirqs last disabled at (335): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (335): [] _raw_spin_lock_irq+0x35/0x80 kernel/locking/spinlock.c:167 softirqs last enabled at (318): [] memcpy include/linux/string.h:406 [inline] softirqs last enabled at (318): [] fpu__copy+0x176/0x750 arch/x86/kernel/fpu/core.c:240 softirqs last disabled at (329): [] asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 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 *** 1 lock held by syz-executor878/16778: #0: ffffc90000da8d68 ((&sk->sk_timer)){+.-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:35 [inline] #0: ffffc90000da8d68 ((&sk->sk_timer)){+.-.}-{0:0}, at: call_timer_fn+0xdb/0x760 kernel/time/timer.c:1403 stack backtrace: CPU: 1 PID: 16778 Comm: syz-executor878 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_usage_bug kernel/locking/lockdep.c:4020 [inline] valid_state kernel/locking/lockdep.c:3361 [inline] mark_lock_irq kernel/locking/lockdep.c:3560 [inline] mark_lock.cold+0x7a/0x7f kernel/locking/lockdep.c:4006 mark_usage kernel/locking/lockdep.c:3905 [inline] __lock_acquire+0x1437/0x5640 kernel/locking/lockdep.c:4380 lock_acquire+0x1f1/0xad0 kernel/locking/lockdep.c:5005 __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+0x24/0x140 net/bluetooth/sco.c:83 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:slab_alloc mm/slab.c:3305 [inline] RIP: 0010:kmem_cache_alloc+0x100/0x3a0 mm/slab.c:3482 Code: 41 f7 c4 00 02 00 00 4c 89 7c 24 08 0f 84 d2 00 00 00 e8 03 11 c6 ff 48 83 3d e3 3e 02 08 00 0f 84 9b 02 00 00 4c 89 e7 57 9d <0f> 1f 44 00 00 4c 8b 44 24 08 41 0f 18 08 e9 99 01 00 00 f6 c7 01 RSP: 0018:ffffc90016407ad0 EFLAGS: 00000282 RAX: 0000000000000147 RBX: 0000000000000cc0 RCX: 1ffffffff1563bd1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000282 RBP: ffff8880aa06f900 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000282 R13: 0000000000000cc0 R14: ffff8880aa06f900 R15: ffff8881e9251d00 prepare_creds+0x39/0x6c0 kernel/cred.c:258 copy_creds+0x9f/0x770 kernel/cred.c:358 copy_process+0x11e2/0x6920 kernel/fork.c:1949 _do_fork+0xe8/0xb10 kernel/fork.c:2428 __do_sys_clone+0xc8/0x110 kernel/fork.c:2545 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x44a669 Code: e8 4c e7 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 3b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fe5fde8bdb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00000000006e6a08 RCX: 000000000044a669 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000080000100 RBP: 00000000006e6a00 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e6a0c R13: 00007fff8c07a36f R14: 00007fe5fde8c9c0 R15: 0000000000000064