ODEBUG: object 000000009e6303b0 is on stack 000000004013cbf5, but NOT annotated. WARNING: CPU: 0 PID: 7664 at lib/debugobjects.c:369 debug_object_is_on_stack lib/debugobjects.c:363 [inline] WARNING: CPU: 0 PID: 7664 at lib/debugobjects.c:369 __debug_object_init.cold.14+0x51/0xdf lib/debugobjects.c:395 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7664 Comm: syz-executor5 Not tainted 4.19.0-rc8-next-20181019+ #98 kobject: 'loop1' (00000000040c35d3): kobject_uevent_env 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 kobject: 'loop1' (00000000040c35d3): fill_kobj_path: path = '/devices/virtual/block/loop1' panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 report_bug+0x254/0x2d0 lib/bug.c:186 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_object_is_on_stack lib/debugobjects.c:363 [inline] RIP: 0010:__debug_object_init.cold.14+0x51/0xdf lib/debugobjects.c:395 Code: ea 03 80 3c 02 00 75 7c 49 8b 54 24 18 48 89 de 48 c7 c7 c0 f1 40 88 4c 89 85 d0 fd ff ff e8 09 8c d1 fd 4c 8b 85 d0 fd ff ff <0f> 0b e9 09 d6 ff ff 41 83 c4 01 b8 ff ff 37 00 44 89 25 b7 4e 66 kobject: 'loop1' (00000000040c35d3): kobject_uevent_env RSP: 0018:ffff88017e3ef308 EFLAGS: 00010086 RAX: 0000000000000050 RBX: ffff88017e3efaf8 RCX: ffffc9000bee6000 RDX: 0000000000000000 RSI: ffffffff816585a5 RDI: 0000000000000005 RBP: ffff88017e3ef560 R08: ffff8801b8e2a630 R09: ffffed003b5c5008 R10: ffffed003b5c5008 R11: ffff8801dae28047 R12: ffff88017e3e45c0 R13: 00000000000a2f80 R14: ffff88017e3e45c0 R15: ffff8801b8e2a620 kobject: 'loop1' (00000000040c35d3): fill_kobj_path: path = '/devices/virtual/block/loop1' kobject: 'loop2' (00000000b96f3c98): kobject_uevent_env kobject: 'loop2' (00000000b96f3c98): fill_kobj_path: path = '/devices/virtual/block/loop2' debug_object_init+0x16/0x20 lib/debugobjects.c:432 debug_timer_init kernel/time/timer.c:704 [inline] debug_init kernel/time/timer.c:757 [inline] init_timer_key+0xa9/0x480 kernel/time/timer.c:806 sock_init_data+0xe1/0xdc0 net/core/sock.c:2696 kobject: 'loop0' (0000000047882c75): kobject_uevent_env bpf_prog_test_run_skb+0x255/0xc40 net/bpf/test_run.c:144 kobject: 'loop0' (0000000047882c75): fill_kobj_path: path = '/devices/virtual/block/loop0' kobject: 'loop2' (00000000b96f3c98): kobject_uevent_env bpf_prog_test_run+0x130/0x1a0 kernel/bpf/syscall.c:1790 __do_sys_bpf kernel/bpf/syscall.c:2427 [inline] __se_sys_bpf kernel/bpf/syscall.c:2371 [inline] __x64_sys_bpf+0x3d8/0x510 kernel/bpf/syscall.c:2371 kobject: 'loop2' (00000000b96f3c98): fill_kobj_path: path = '/devices/virtual/block/loop2' do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 kobject: 'loop2' (00000000b96f3c98): kobject_uevent_env RSP: 002b:00007f88c8052c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000000000028 RSI: 0000000020000540 RDI: 000000000000000a RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f88c80536d4 R13: 00000000004bd892 R14: 00000000004cc208 R15: 00000000ffffffff ====================================================== WARNING: possible circular locking dependency detected 4.19.0-rc8-next-20181019+ #98 Not tainted ------------------------------------------------------ syz-executor5/7664 is trying to acquire lock: 00000000925b8d89 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 0000000012e54820 (&obj_hash[i].lock){-.-.}, at: __debug_object_init+0x127/0x1290 lib/debugobjects.c:384 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 check_stack_usage kernel/exit.c:755 [inline] do_exit.cold.18+0x57/0x16f kernel/exit.c:916 do_group_exit+0x177/0x440 kernel/exit.c:970 __do_sys_exit_group kernel/exit.c:981 [inline] __se_sys_exit_group kernel/exit.c:979 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:979 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 ((console_sem).lock){-.-.}: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844 __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 debug_object_is_on_stack lib/debugobjects.c:363 [inline] __debug_object_init.cold.14+0x4a/0xdf lib/debugobjects.c:395 debug_object_init+0x16/0x20 lib/debugobjects.c:432 debug_timer_init kernel/time/timer.c:704 [inline] debug_init kernel/time/timer.c:757 [inline] init_timer_key+0xa9/0x480 kernel/time/timer.c:806 sock_init_data+0xe1/0xdc0 net/core/sock.c:2696 bpf_prog_test_run_skb+0x255/0xc40 net/bpf/test_run.c:144 bpf_prog_test_run+0x130/0x1a0 kernel/bpf/syscall.c:1790 __do_sys_bpf kernel/bpf/syscall.c:2427 [inline] __se_sys_bpf kernel/bpf/syscall.c:2371 [inline] __x64_sys_bpf+0x3d8/0x510 kernel/bpf/syscall.c:2371 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-executor5/7664: #0: 0000000012e54820 (&obj_hash[i].lock){-.-.}, at: __debug_object_init+0x127/0x1290 lib/debugobjects.c:384 stack backtrace: CPU: 0 PID: 7664 Comm: syz-executor5 Not tainted 4.19.0-rc8-next-20181019+ #98 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:1221 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2347 [inline] __lock_acquire+0x3399/0x4c20 kernel/locking/lockdep.c:3341 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3844 __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 debug_object_is_on_stack lib/debugobjects.c:363 [inline] __debug_object_init.cold.14+0x4a/0xdf lib/debugobjects.c:395 debug_object_init+0x16/0x20 lib/debugobjects.c:432 debug_timer_init kernel/time/timer.c:704 [inline] debug_init kernel/time/timer.c:757 [inline] init_timer_key+0xa9/0x480 kernel/time/timer.c:806 sock_init_data+0xe1/0xdc0 net/core/sock.c:2696 bpf_prog_test_run_skb+0x255/0xc40 net/bpf/test_run.c:144 bpf_prog_test_run+0x130/0x1a0 kernel/bpf/syscall.c:1790 __do_sys_bpf kernel/bpf/syscall.c:2427 [inline] __se_sys_bpf kernel/bpf/syscall.c:2371 [inline] __x64_sys_bpf+0x3d8/0x510 kernel/bpf/syscall.c:2371 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457569 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f88c8052c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 RDX: 0000000000000028 RSI: 0000000020000540 RDI: 000000000000000a RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f88c80536d4 R13: 00000000004bd892 R14: 00000000004cc208 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..