------------[ cut here ]------------ ODEBUG: free active (active state 1) object type: rcu_head hint: (null) WARNING: CPU: 1 PID: 5675 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 lib/debugobjects.c:326 kobject: 'loop0' (0000000041e1a21b): kobject_uevent_env Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 5675 Comm: syz-executor3 Not tainted 4.19.0-rc8-next-20181016+ #95 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 kobject: 'loop0' (0000000041e1a21b): fill_kobj_path: path = '/devices/virtual/block/loop0' Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 report_bug+0x254/0x2d0 lib/bug.c:186 kobject: 'kvm' (00000000fb87e086): kobject_uevent_env fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969 RIP: 0010:debug_print_object+0x16a/0x210 lib/debugobjects.c:326 Code: 40 88 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd 80 fc 40 88 4c 89 fe 48 c7 c7 20 f2 40 88 e8 96 25 b5 fd <0f> 0b 83 05 79 6a 60 06 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f kobject: 'kvm' (00000000fb87e086): kobject_uevent_env RSP: 0018:ffff8801c6d6ef08 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81647515 RDI: 0000000000000005 RBP: ffff8801c6d6ef48 R08: ffff8801c6d666c0 R09: ffffed003b5e3eda R10: ffffed003b5e3eda R11: ffff8801daf1f6d7 R12: 0000000000000001 R13: ffffffff8939a4e0 R14: 0000000000000000 R15: ffffffff8840f6c0 kobject: 'kvm' (00000000fb87e086): fill_kobj_path: path = '/devices/virtual/misc/kvm' __debug_check_no_obj_freed lib/debugobjects.c:786 [inline] debug_check_no_obj_freed+0x3ae/0x58d lib/debugobjects.c:818 kmem_cache_free+0x202/0x290 mm/slab.c:3759 free_task_struct kernel/fork.c:163 [inline] free_task+0x16e/0x1f0 kernel/fork.c:457 kobject: 'kvm' (00000000fb87e086): fill_kobj_path: path = '/devices/virtual/misc/kvm' __put_task_struct+0x2e6/0x620 kernel/fork.c:730 kobject: 'loop0' (0000000041e1a21b): kobject_uevent_env kobject: 'loop0' (0000000041e1a21b): fill_kobj_path: path = '/devices/virtual/block/loop0' put_task_struct include/linux/sched/task.h:96 [inline] finish_task_switch+0x66b/0x920 kernel/sched/core.c:2715 context_switch kernel/sched/core.c:2834 [inline] __schedule+0x8d7/0x21d0 kernel/sched/core.c:3480 preempt_schedule_irq+0xb9/0x140 kernel/sched/core.c:3707 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline] RIP: 0010:lock_release+0x4ea/0xa10 kernel/locking/lockdep.c:3867 Code: 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 1d 04 00 00 48 83 3d a5 96 d1 07 00 0f 84 80 02 00 00 48 8b bd e0 fe ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 RSP: 0018:ffff8801c6d6f5d8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10038dadec0 RCX: 1ffff10038dacde6 RDX: 1ffffffff1263eae RSI: 1ffff10038dacde8 RDI: 0000000000000282 RBP: ffff8801c6d6f708 R08: 1ffff10038dadec4 R09: 0000000000000008 R10: 0000000000000001 R11: ffff8801c6d666c0 R12: ffff8801c6d666c0 R13: 0000000000000000 R14: ffff8801c6d666c0 R15: ffff8801c6d6f620 __fs_reclaim_release mm/page_alloc.c:3731 [inline] fs_reclaim_release.part.101+0x1c/0x20 mm/page_alloc.c:3744 fs_reclaim_release+0x14/0x20 mm/page_alloc.c:3745 slab_pre_alloc_hook mm/slab.h:419 [inline] slab_alloc mm/slab.c:3378 [inline] kmem_cache_alloc_trace+0x34/0x750 mm/slab.c:3618 kmalloc include/linux/slab.h:546 [inline] kzalloc include/linux/slab.h:741 [inline] apparmor_sk_alloc_security+0x86/0xf0 security/apparmor/lsm.c:872 security_sk_alloc+0x60/0xc0 security/security.c:1515 sk_prot_alloc+0xac/0x2e0 net/core/sock.c:1471 sk_alloc+0x10d/0x1690 net/core/sock.c:1522 inet6_create+0x501/0x1230 net/ipv6/af_inet6.c:183 __sock_create+0x536/0x930 net/socket.c:1278 sock_create net/socket.c:1318 [inline] __sys_socket+0x106/0x260 net/socket.c:1348 __do_sys_socket net/socket.c:1357 [inline] __se_sys_socket net/socket.c:1355 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1355 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a0d7 Code: 00 00 00 49 89 ca b8 36 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7a 88 fb ff c3 66 0f 1f 84 00 00 00 00 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 5d 88 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc3df03e88 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000707b00 RCX: 000000000045a0d7 RDX: 0000000000000006 RSI: 0000000000000001 RDI: 000000000000000a RBP: 0000000000000003 R08: 0000000000006000 R09: 0000000000004000 R10: 00007ffc3df03fb0 R11: 0000000000000246 R12: 0000000000000003 R13: 00000000000c7472 R14: 0000000000000029 R15: 0000000000000003 ====================================================== WARNING: possible circular locking dependency detected 4.19.0-rc8-next-20181016+ #95 Not tainted ------------------------------------------------------ syz-executor3/5675 is trying to acquire lock: 000000002a51a0b6 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 00000000ab2f0e7f (&obj_hash[i].lock){-.-.}, at: __debug_check_no_obj_freed lib/debugobjects.c:777 [inline] 00000000ab2f0e7f (&obj_hash[i].lock){-.-.}, at: debug_check_no_obj_freed+0x17a/0x58d lib/debugobjects.c:818 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&obj_hash[i].lock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 __debug_object_init+0x127/0x1290 lib/debugobjects.c:384 debug_object_init+0x16/0x20 lib/debugobjects.c:432 debug_hrtimer_init kernel/time/hrtimer.c:410 [inline] debug_init kernel/time/hrtimer.c:458 [inline] hrtimer_init+0x97/0x490 kernel/time/hrtimer.c:1308 init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1057 __sched_fork+0x2ae/0x590 kernel/sched/core.c:2166 init_idle+0x75/0x740 kernel/sched/core.c:5382 sched_init+0xb33/0xc02 kernel/sched/core.c:6065 start_kernel+0x4be/0xa2b init/main.c:608 x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:472 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:451 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 -> #2 (&rq->lock){-.-.}: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144 rq_lock kernel/sched/sched.h:1127 [inline] task_fork_fair+0xb0/0x6d0 kernel/sched/fair.c:9768 sched_fork+0x443/0xba0 kernel/sched/core.c:2359 copy_process+0x2585/0x8770 kernel/fork.c:1887 _do_fork+0x1cb/0x11c0 kernel/fork.c:2216 kernel_thread+0x34/0x40 kernel/fork.c:2275 rest_init+0x28/0x372 init/main.c:409 arch_call_rest_init+0xe/0x1b start_kernel+0x9f0/0xa2b init/main.c:745 x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:472 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:451 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243 -> #1 (&p->pi_lock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 try_to_wake_up+0xd2/0x12e0 kernel/sched/core.c:1965 wake_up_process+0x10/0x20 kernel/sched/core.c:2129 __up.isra.1+0x1c0/0x2a0 kernel/locking/semaphore.c:262 up+0x13c/0x1c0 kernel/locking/semaphore.c:187 __up_console_sem+0xbe/0x1b0 kernel/printk/printk.c:236 console_unlock+0x80c/0x1190 kernel/printk/printk.c:2432 vprintk_emit+0x391/0x990 kernel/printk/printk.c:1922 vprintk_default+0x28/0x30 kernel/printk/printk.c:1964 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1997 fill_kobj_path lib/kobject.c:151 [inline] kobject_get_path.cold.8+0x38/0x47 lib/kobject.c:174 kobject_uevent_env+0x314/0x101e lib/kobject_uevent.c:519 call_crda net/wireless/reg.c:556 [inline] reg_query_database+0x283/0x400 net/wireless/reg.c:1104 reg_process_hint_core net/wireless/reg.c:2339 [inline] reg_process_hint+0x189/0xec0 net/wireless/reg.c:2677 reg_process_pending_hints net/wireless/reg.c:2767 [inline] reg_todo+0x49a/0xc20 net/wireless/reg.c:2844 process_one_work+0xc8b/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 -> #0 ((console_sem).lock){-.-.}: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3845 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xae/0x1f0 kernel/printk/printk.c:219 console_trylock+0x15/0xa0 kernel/printk/printk.c:2247 console_trylock_spinning kernel/printk/printk.c:1653 [inline] vprintk_emit+0x372/0x990 kernel/printk/printk.c:1921 vprintk_default+0x28/0x30 kernel/printk/printk.c:1964 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1997 __warn_printk+0x8c/0xe0 kernel/panic.c:594 debug_print_object+0x16a/0x210 lib/debugobjects.c:326 __debug_check_no_obj_freed lib/debugobjects.c:786 [inline] debug_check_no_obj_freed+0x3ae/0x58d lib/debugobjects.c:818 kmem_cache_free+0x202/0x290 mm/slab.c:3759 free_task_struct kernel/fork.c:163 [inline] free_task+0x16e/0x1f0 kernel/fork.c:457 __put_task_struct+0x2e6/0x620 kernel/fork.c:730 put_task_struct include/linux/sched/task.h:96 [inline] finish_task_switch+0x66b/0x920 kernel/sched/core.c:2715 context_switch kernel/sched/core.c:2834 [inline] __schedule+0x8d7/0x21d0 kernel/sched/core.c:3480 preempt_schedule_irq+0xb9/0x140 kernel/sched/core.c:3707 retint_kernel+0x1b/0x2d arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline] lock_release+0x4ea/0xa10 kernel/locking/lockdep.c:3867 __fs_reclaim_release mm/page_alloc.c:3731 [inline] fs_reclaim_release.part.101+0x1c/0x20 mm/page_alloc.c:3744 fs_reclaim_release+0x14/0x20 mm/page_alloc.c:3745 slab_pre_alloc_hook mm/slab.h:419 [inline] slab_alloc mm/slab.c:3378 [inline] kmem_cache_alloc_trace+0x34/0x750 mm/slab.c:3618 kmalloc include/linux/slab.h:546 [inline] kzalloc include/linux/slab.h:741 [inline] apparmor_sk_alloc_security+0x86/0xf0 security/apparmor/lsm.c:872 security_sk_alloc+0x60/0xc0 security/security.c:1515 sk_prot_alloc+0xac/0x2e0 net/core/sock.c:1471 sk_alloc+0x10d/0x1690 net/core/sock.c:1522 inet6_create+0x501/0x1230 net/ipv6/af_inet6.c:183 __sock_create+0x536/0x930 net/socket.c:1278 sock_create net/socket.c:1318 [inline] __sys_socket+0x106/0x260 net/socket.c:1348 __do_sys_socket net/socket.c:1357 [inline] __se_sys_socket net/socket.c:1355 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1355 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: (console_sem).lock --> &rq->lock --> &obj_hash[i].lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&obj_hash[i].lock); lock(&rq->lock); lock(&obj_hash[i].lock); lock((console_sem).lock); *** DEADLOCK *** 1 lock held by syz-executor3/5675: #0: 00000000ab2f0e7f (&obj_hash[i].lock){-.-.}, at: __debug_check_no_obj_freed lib/debugobjects.c:777 [inline] #0: 00000000ab2f0e7f (&obj_hash[i].lock){-.-.}, at: debug_check_no_obj_freed+0x17a/0x58d lib/debugobjects.c:818 stack backtrace: CPU: 1 PID: 5675 Comm: syz-executor3 Not tainted 4.19.0-rc8-next-20181016+ #95 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+0x244/0x39d lib/dump_stack.c:113 print_circular_bug.isra.35.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1864 [inline] check_prevs_add kernel/locking/lockdep.c:1977 [inline] validate_chain kernel/locking/lockdep.c:2348 [inline] __lock_acquire+0x3399/0x4c20 kernel/locking/lockdep.c:3342 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3845 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xae/0x1f0 kernel/printk/printk.c:219 console_trylock+0x15/0xa0 kernel/printk/printk.c:2247 console_trylock_spinning kernel/printk/printk.c:1653 [inline] vprintk_emit+0x372/0x990 kernel/printk/printk.c:1921 vprintk_default+0x28/0x30 kernel/printk/printk.c:1964 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1997 __warn_printk+0x8c/0xe0 kernel/panic.c:594 debug_print_object+0x16a/0x210 lib/debugobjects.c:326 __debug_check_no_obj_freed lib/debugobjects.c:786 [inline] debug_check_no_obj_freed+0x3ae/0x58d lib/debugobjects.c:818 kmem_cache_free+0x202/0x290 mm/slab.c:3759 free_task_struct kernel/fork.c:163 [inline] free_task+0x16e/0x1f0 kernel/fork.c:457 __put_task_struct+0x2e6/0x620 kernel/fork.c:730 put_task_struct include/linux/sched/task.h:96 [inline] finish_task_switch+0x66b/0x920 kernel/sched/core.c:2715 context_switch kernel/sched/core.c:2834 [inline] __schedule+0x8d7/0x21d0 kernel/sched/core.c:3480 preempt_schedule_irq+0xb9/0x140 kernel/sched/core.c:3707 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:761 [inline] RIP: 0010:lock_release+0x4ea/0xa10 kernel/locking/lockdep.c:3867 Code: 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 1d 04 00 00 48 83 3d a5 96 d1 07 00 0f 84 80 02 00 00 48 8b bd e0 fe ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 RSP: 0018:ffff8801c6d6f5d8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 1ffff10038dadec0 RCX: 1ffff10038dacde6 RDX: 1ffffffff1263eae RSI: 1ffff10038dacde8 RDI: 0000000000000282 RBP: ffff8801c6d6f708 R08: 1ffff10038dadec4 R09: 0000000000000008 R10: 0000000000000001 R11: ffff8801c6d666c0 R12: ffff8801c6d666c0 R13: 0000000000000000 R14: ffff8801c6d666c0 R15: ffff8801c6d6f620 __fs_reclaim_release mm/page_alloc.c:3731 [inline] fs_reclaim_release.part.101+0x1c/0x20 mm/page_alloc.c:3744 fs_reclaim_release+0x14/0x20 mm/page_alloc.c:3745 kmem_c Lost 53 message(s)! Kernel Offset: disabled Rebooting in 86400 seconds..