IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready ODEBUG: object is on stack, but not annotated WARNING: CPU: 1 PID: 5976 at lib/debugobjects.c:366 debug_object_is_on_stack lib/debugobjects.c:365 [inline] WARNING: CPU: 1 PID: 5976 at lib/debugobjects.c:366 __debug_object_init+0x637/0x1150 lib/debugobjects.c:392 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 5976 Comm: syz-executor3 Not tainted 4.16.0+ #14 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+0x1a7/0x27d lib/dump_stack.c:53 panic+0x1f8/0x42c kernel/panic.c:183 __warn+0x1dc/0x200 kernel/panic.c:547 report_bug+0x1f4/0x2b0 lib/bug.c:186 fixup_bug.part.10+0x37/0x80 arch/x86/kernel/traps.c:178 fixup_bug arch/x86/kernel/traps.c:247 [inline] do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:991 RIP: 0010:debug_object_is_on_stack lib/debugobjects.c:365 [inline] RIP: 0010:__debug_object_init+0x637/0x1150 lib/debugobjects.c:392 RSP: 0018:ffff8801b15f78e8 EFLAGS: 00010086 RAX: 000000000000002d RBX: 0000000000000001 RCX: 0000000000000000 RDX: 000000000000002d RSI: ffffc900072d2000 RDI: ffffed00362bef11 RBP: ffff8801b15f7b40 R08: ffffed003b624fb1 R09: ffffed003b624fb1 R10: 0000000000000001 R11: ffffed003b624fb0 R12: ffff8801d7ca9f18 R13: ffff8801d7ca9f28 R14: ffff8801b15f7ca0 R15: ffff8801b14e0140 debug_object_init+0x17/0x20 lib/debugobjects.c:429 debug_hrtimer_init kernel/time/hrtimer.c:410 [inline] debug_init kernel/time/hrtimer.c:458 [inline] hrtimer_init+0x8c/0x410 kernel/time/hrtimer.c:1259 alarm_init kernel/time/alarmtimer.c:339 [inline] alarm_timer_nsleep+0x164/0x4d0 kernel/time/alarmtimer.c:787 SYSC_clock_nanosleep kernel/time/posix-timers.c:1227 [inline] SyS_clock_nanosleep+0x235/0x330 kernel/time/posix-timers.c:1205 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4552d9 RSP: 002b:00007fac6a5f5c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 00007fac6a5f66d4 RCX: 00000000004552d9 RDX: 0000000020000080 RSI: 0000008000000000 RDI: 0800002000000009 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000004f R14: 00000000006f3808 R15: 0000000000000000 ====================================================== WARNING: possible circular locking dependency detected 4.16.0+ #14 Not tainted ------------------------------------------------------ syz-executor3/5976 is trying to acquire lock: 000000009957dbe4 ((console_sem).lock){....}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 000000003d3736c4 (&obj_hash[i].lock){-.-.}, at: __debug_object_init+0x123/0x1150 lib/debugobjects.c:381 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+0x96/0xc0 kernel/locking/spinlock.c:152 __debug_object_init+0x123/0x1150 lib/debugobjects.c:381 debug_object_init+0x17/0x20 lib/debugobjects.c:429 debug_hrtimer_init kernel/time/hrtimer.c:410 [inline] debug_init kernel/time/hrtimer.c:458 [inline] hrtimer_init+0x8c/0x410 kernel/time/hrtimer.c:1259 init_dl_task_timer+0x1b/0x50 kernel/sched/deadline.c:1056 __sched_fork+0x2b1/0xc20 kernel/sched/core.c:2163 init_idle+0x75/0x820 kernel/sched/core.c:5406 sched_init+0xbf0/0xd1a kernel/sched/core.c:6103 start_kernel+0x452/0x819 init/main.c:586 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:443 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:424 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242 -> #2 (&rq->lock){-.-.}: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 rq_lock kernel/sched/sched.h:1792 [inline] task_fork_fair+0x7a/0x690 kernel/sched/fair.c:9967 sched_fork+0x450/0xc10 kernel/sched/core.c:2379 copy_process.part.38+0x1866/0x6140 kernel/fork.c:1763 copy_process kernel/fork.c:1606 [inline] _do_fork+0x1f7/0xfa0 kernel/fork.c:2087 kernel_thread+0x34/0x40 kernel/fork.c:2146 rest_init+0x22/0xf0 init/main.c:403 start_kernel+0x7f1/0x819 init/main.c:717 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:443 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:424 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242 -> #1 (&p->pi_lock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 try_to_wake_up+0xc0/0x1300 kernel/sched/core.c:1963 wake_up_process+0x10/0x20 kernel/sched/core.c:2126 __up.isra.0+0x1cc/0x2c0 kernel/locking/semaphore.c:262 up+0x13b/0x1d0 kernel/locking/semaphore.c:187 __up_console_sem+0xb2/0x1a0 kernel/printk/printk.c:242 console_unlock+0x5af/0xfb0 kernel/printk/printk.c:2417 do_con_write+0x106e/0x1f70 drivers/tty/vt/vt.c:2433 con_write+0x25/0xb0 drivers/tty/vt/vt.c:2782 process_output_block drivers/tty/n_tty.c:579 [inline] n_tty_write+0x5ef/0xec0 drivers/tty/n_tty.c:2308 do_tty_write drivers/tty/tty_io.c:958 [inline] tty_write+0x3fa/0x840 drivers/tty/tty_io.c:1042 __vfs_write+0xef/0x970 fs/read_write.c:485 vfs_write+0x189/0x510 fs/read_write.c:549 ksys_write+0xef/0x220 fs/read_write.c:598 SYSC_write fs/read_write.c:610 [inline] SyS_write+0x24/0x30 fs/read_write.c:607 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 ((console_sem).lock){....}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xa2/0x1e0 kernel/printk/printk.c:225 console_trylock+0x15/0x70 kernel/printk/printk.c:2229 console_trylock_spinning kernel/printk/printk.c:1643 [inline] vprintk_emit+0x5b5/0xb90 kernel/printk/printk.c:1906 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947 vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 printk+0xaa/0xca kernel/printk/printk.c:1980 debug_object_is_on_stack lib/debugobjects.c:363 [inline] __debug_object_init+0x5f8/0x1150 lib/debugobjects.c:392 debug_object_init+0x17/0x20 lib/debugobjects.c:429 debug_hrtimer_init kernel/time/hrtimer.c:410 [inline] debug_init kernel/time/hrtimer.c:458 [inline] hrtimer_init+0x8c/0x410 kernel/time/hrtimer.c:1259 alarm_init kernel/time/alarmtimer.c:339 [inline] alarm_timer_nsleep+0x164/0x4d0 kernel/time/alarmtimer.c:787 SYSC_clock_nanosleep kernel/time/posix-timers.c:1227 [inline] SyS_clock_nanosleep+0x235/0x330 kernel/time/posix-timers.c:1205 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 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-executor3/5976: #0: 000000003d3736c4 (&obj_hash[i].lock){-.-.}, at: __debug_object_init+0x123/0x1150 lib/debugobjects.c:381 stack backtrace: CPU: 1 PID: 5976 Comm: syz-executor3 Not tainted 4.16.0+ #14 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+0x1a7/0x27d lib/dump_stack.c:53 print_circular_bug.isra.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2417 [inline] __lock_acquire+0x2f96/0x3c30 kernel/locking/lockdep.c:3431 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xa2/0x1e0 kernel/printk/printk.c:225 console_trylock+0x15/0x70 kernel/printk/printk.c:2229 console_trylock_spinning kernel/printk/printk.c:1643 [inline] vprintk_emit+0x5b5/0xb90 kernel/printk/printk.c:1906 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947 vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 printk+0xaa/0xca kernel/printk/printk.c:1980 debug_object_is_on_stack lib/debugobjects.c:363 [inline] __debug_object_init+0x5f8/0x1150 lib/debugobjects.c:392 debug_object_init+0x17/0x20 lib/debugobjects.c:429 debug_hrtimer_init kernel/time/hrtimer.c:410 [inline] debug_init kernel/time/hrtimer.c:458 [inline] hrtimer_init+0x8c/0x410 kernel/time/hrtimer.c:1259 alarm_init kernel/time/alarmtimer.c:339 [inline] alarm_timer_nsleep+0x164/0x4d0 kernel/time/alarmtimer.c:787 SYSC_clock_nanosleep kernel/time/posix-timers.c:1227 [inline] SyS_clock_nanosleep+0x235/0x330 kernel/time/posix-timers.c:1205 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4552d9 RSP: 002b:00007fac6a5f5c68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 00007fac6a5f66d4 RCX: 00000000004552d9 RDX: 0000000020000080 RSI: 0000008000000000 RDI: 0800002000000009 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000004f R14: 00000000006f3808 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..