WARNING: ODEBUG bug in enqueue

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WARNING: ODEBUG bug in enqueue_hrtimer	0 (1)	2018/07/31 12:31

netlink: 20 bytes leftover after parsing attributes in process `syz-executor3'. ------------[ cut here ]------------ ODEBUG: activate not available (active state 0) object type: hrtimer hint: bcm_tx_timeout_handler+0x0/0x60 net/can/bcm.c:241 WARNING: CPU: 1 PID: 18 at lib/debugobjects.c:329 debug_print_object+0x16a/0x210 lib/debugobjects.c:326 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.18.0-rc7+ #170 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+0x1c9/0x2b4 lib/dump_stack.c:113 panic+0x238/0x4e7 kernel/panic.c:184 __warn.cold.8+0x163/0x1ba kernel/panic.c:536 report_bug+0x252/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992 RIP: 0010:debug_print_object+0x16a/0x210 lib/debugobjects.c:326 Code: 3a 87 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 92 00 00 00 48 8b 14 dd 20 74 3a 87 4c 89 f6 48 c7 c7 c0 69 3a 87 e8 c6 b0 e6 fd <0f> 0b 83 05 a9 e6 29 05 01 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f RSP: 0018:ffff8801d9f27680 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000000000 RDX: 0000000000000100 RSI: ffffffff81632481 RDI: 0000000000000001 RBP: ffff8801d9f276c0 R08: ffff8801d9f0c4c0 R09: ffffed003b623ec2 R10: ffffed003b623ec2 R11: ffff8801db11f617 R12: 0000000000000001 R13: ffffffff87fa0660 R14: ffffffff873a7040 R15: ffffffff816a48f0 debug_object_activate+0x359/0x690 lib/debugobjects.c:513 debug_hrtimer_activate kernel/time/hrtimer.c:416 [inline] debug_activate kernel/time/hrtimer.c:465 [inline] enqueue_hrtimer+0x9e/0x540 kernel/time/hrtimer.c:954 __hrtimer_start_range_ns kernel/time/hrtimer.c:1089 [inline] hrtimer_start_range_ns+0x616/0xd20 kernel/time/hrtimer.c:1115 hrtimer_start include/linux/hrtimer.h:398 [inline] bcm_tx_start_timer+0x11d/0x1b0 net/can/bcm.c:361 bcm_tx_timeout_tsklet+0x1ab/0x4b0 net/can/bcm.c:392 tasklet_action_common.isra.19+0x26f/0x720 kernel/softirq.c:522 tasklet_action+0x1d/0x20 kernel/softirq.c:540 __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 run_ksoftirqd+0x86/0x100 kernel/softirq.c:653 smpboot_thread_fn+0x417/0x870 kernel/smpboot.c:164 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 ====================================================== WARNING: possible circular locking dependency detected 4.18.0-rc7+ #170 Not tainted ------------------------------------------------------ ksoftirqd/1/18 is trying to acquire lock: 000000006298a4a7 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 0000000018a38b75 (hrtimer_bases.lock){-.-.}, at: lock_hrtimer_base.isra.18+0x75/0x130 kernel/time/hrtimer.c:174 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (hrtimer_bases.lock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 lock_hrtimer_base.isra.18+0x75/0x130 kernel/time/hrtimer.c:174 hrtimer_start_range_ns+0x128/0xd20 kernel/time/hrtimer.c:1113 hrtimer_start_expires include/linux/hrtimer.h:412 [inline] start_rt_bandwidth kernel/sched/rt.c:68 [inline] inc_rt_group kernel/sched/rt.c:1147 [inline] inc_rt_tasks kernel/sched/rt.c:1191 [inline] __enqueue_rt_entity kernel/sched/rt.c:1261 [inline] enqueue_rt_entity kernel/sched/rt.c:1305 [inline] enqueue_task_rt+0x96a/0xfd0 kernel/sched/rt.c:1335 enqueue_task+0xa2/0x1d0 kernel/sched/core.c:750 __sched_setscheduler+0xe80/0x20b0 kernel/sched/core.c:4365 _sched_setscheduler+0x20c/0x370 kernel/sched/core.c:4402 sched_setscheduler+0xe/0x10 kernel/sched/core.c:4417 watchdog_set_prio kernel/watchdog.c:455 [inline] watchdog_enable+0x12d/0x1a0 kernel/watchdog.c:477 smpboot_thread_fn+0x4c0/0x870 kernel/smpboot.c:145 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 -> #3 (&rt_b->rt_runtime_lock){-.-.}: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:144 start_rt_bandwidth kernel/sched/rt.c:56 [inline] inc_rt_group kernel/sched/rt.c:1147 [inline] inc_rt_tasks kernel/sched/rt.c:1191 [inline] __enqueue_rt_entity kernel/sched/rt.c:1261 [inline] enqueue_rt_entity kernel/sched/rt.c:1305 [inline] enqueue_task_rt+0x618/0xfd0 kernel/sched/rt.c:1335 enqueue_task+0xa2/0x1d0 kernel/sched/core.c:750 __sched_setscheduler+0xe80/0x20b0 kernel/sched/core.c:4365 _sched_setscheduler+0x20c/0x370 kernel/sched/core.c:4402 sched_setscheduler+0xe/0x10 kernel/sched/core.c:4417 watchdog_set_prio kernel/watchdog.c:455 [inline] watchdog_enable+0x12d/0x1a0 kernel/watchdog.c:477 smpboot_thread_fn+0x4c0/0x870 kernel/smpboot.c:145 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 -> #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:1812 [inline] task_fork_fair+0x93/0x680 kernel/sched/fair.c:9952 sched_fork+0x446/0xb40 kernel/sched/core.c:2381 copy_process.part.39+0x1bf5/0x70b0 kernel/fork.c:1796 copy_process kernel/fork.c:1639 [inline] _do_fork+0x291/0x12a0 kernel/fork.c:2122 kernel_thread+0x34/0x40 kernel/fork.c:2181 rest_init+0x22/0xe4 init/main.c:408 start_kernel+0x90e/0x949 init/main.c:738 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 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+0xd2/0x12a0 kernel/sched/core.c:1985 wake_up_process+0x10/0x20 kernel/sched/core.c:2148 __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:242 console_unlock+0x7a2/0x10b0 kernel/printk/printk.c:2411 vprintk_emit+0x6c6/0xdf0 kernel/printk/printk.c:1907 vprintk_default+0x28/0x30 kernel/printk/printk.c:1948 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:382 printk+0xa7/0xcf kernel/printk/printk.c:1981 load_umh+0x51/0xbd net/bpfilter/bpfilter_kern.c:98 do_one_initcall+0x127/0x913 init/main.c:884 do_initcall_level init/main.c:952 [inline] do_initcalls init/main.c:960 [inline] do_basic_setup init/main.c:978 [inline] kernel_init_freeable+0x49b/0x58e init/main.c:1135 kernel_init+0x11/0x1b3 init/main.c:1061 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 -> #0 ((console_sem).lock){-.-.}: lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924 __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+0xae/0x200 kernel/printk/printk.c:225 console_trylock+0x15/0xa0 kernel/printk/printk.c:2230 console_trylock_spinning kernel/printk/printk.c:1643 [inline] vprintk_emit+0x6ad/0xdf0 kernel/printk/printk.c:1906 vprintk_default+0x28/0x30 kernel/printk/printk.c:1948 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:382 printk+0xa7/0xcf kernel/printk/printk.c:1981 __warn_printk+0x8c/0xe0 kernel/panic.c:590 debug_print_object+0x16a/0x210 lib/debugobjects.c:326 debug_object_activate+0x359/0x690 lib/debugobjects.c:513 debug_hrtimer_activate kernel/time/hrtimer.c:416 [inline] debug_activate kernel/time/hrtimer.c:465 [inline] enqueue_hrtimer+0x9e/0x540 kernel/time/hrtimer.c:954 __hrtimer_start_range_ns kernel/time/hrtimer.c:1089 [inline] hrtimer_start_range_ns+0x616/0xd20 kernel/time/hrtimer.c:1115 hrtimer_start include/linux/hrtimer.h:398 [inline] bcm_tx_start_timer+0x11d/0x1b0 net/can/bcm.c:361 bcm_tx_timeout_tsklet+0x1ab/0x4b0 net/can/bcm.c:392 tasklet_action_common.isra.19+0x26f/0x720 kernel/softirq.c:522 tasklet_action+0x1d/0x20 kernel/softirq.c:540 __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 run_ksoftirqd+0x86/0x100 kernel/softirq.c:653 smpboot_thread_fn+0x417/0x870 kernel/smpboot.c:164 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 other info that might help us debug this: Chain exists of: (console_sem).lock --> &rt_b->rt_runtime_lock --> hrtimer_bases.lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(hrtimer_bases.lock); lock(&rt_b->rt_runtime_lock); lock(hrtimer_bases.lock); lock((console_sem).lock); *** DEADLOCK *** 1 lock held by ksoftirqd/1/18: #0: 0000000018a38b75 (hrtimer_bases.lock){-.-.}, at: lock_hrtimer_base.isra.18+0x75/0x130 kernel/time/hrtimer.c:174 stack backtrace: CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 4.18.0-rc7+ #170 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_circular_bug.isra.36.cold.57+0x1bd/0x27d kernel/locking/lockdep.c:1227 check_prev_add kernel/locking/lockdep.c:1867 [inline] check_prevs_add kernel/locking/lockdep.c:1980 [inline] validate_chain kernel/locking/lockdep.c:2421 [inline] __lock_acquire+0x3449/0x5020 kernel/locking/lockdep.c:3435 lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924 __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+0xae/0x200 kernel/printk/printk.c:225 console_trylock+0x15/0xa0 kernel/printk/printk.c:2230 console_trylock_spinning kernel/printk/printk.c:1643 [inline] vprintk_emit+0x6ad/0xdf0 kernel/printk/printk.c:1906 vprintk_default+0x28/0x30 kernel/printk/printk.c:1948 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:382 printk+0xa7/0xcf kernel/printk/printk.c:1981 __warn_printk+0x8c/0xe0 kernel/panic.c:590 debug_print_object+0x16a/0x210 lib/debugobjects.c:326 debug_object_activate+0x359/0x690 lib/debugobjects.c:513 debug_hrtimer_activate kernel/time/hrtimer.c:416 [inline] debug_activate kernel/time/hrtimer.c:465 [inline] enqueue_hrtimer+0x9e/0x540 kernel/time/hrtimer.c:954 __hrtimer_start_range_ns kernel/time/hrtimer.c:1089 [inline] hrtimer_start_range_ns+0x616/0xd20 kernel/time/hrtimer.c:1115 hrtimer_start include/linux/hrtimer.h:398 [inline] bcm_tx_start_timer+0x11d/0x1b0 net/can/bcm.c:361 bcm_tx_timeout_tsklet+0x1ab/0x4b0 net/can/bcm.c:392 tasklet_action_common.isra.19+0x26f/0x720 kernel/softirq.c:522 tasklet_action+0x1d/0x20 kernel/softirq.c:540 __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 run_ksoftirqd+0x86/0x100 kernel/softirq.c:653 smpboot_thread_fn+0x417/0x870 kernel/smpboot.c:164 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Shutting down cpus with NMI Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..