IPVS: ftp: loaded support on port[0] = 21 kasan: CONFIG_KASAN_INLINE enabled kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 164097 Comm:  Not tainted 4.16.0-rc7+ #368 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:85 [inline] RIP: 0010:account_group_system_time include/linux/sched/cputime.h:149 [inline] RIP: 0010:account_system_index_time+0xdd/0x5e0 kernel/sched/cputime.c:172 RSP: 0018:ffff8801db207930 EFLAGS: 00010006 RAX: 0002810100028101 RBX: ffff8801b22d0300 RCX: 0000502020005047 RDX: dffffc0000000000 RSI: 00000000000f4240 RDI: 0002810100028239 RBP: ffff8801db207a10 R08: 0000000000028101 R09: fffffbfff0f6a2bb R10: ffff8801db2079e8 R11: fffffbfff0f6a2ba R12: 1ffff1003b640f29 R13: 000000000002c5c0 R14: 00000000000f4240 R15: 0000000000000002 FS: 00000000019fd880(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000421d60 CR3: 00000001b1963003 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: account_system_time+0x7f/0xb0 kernel/sched/cputime.c:203 account_process_tick+0xd4/0x3e0 kernel/sched/cputime.c:502 update_process_times+0x23/0x60 kernel/time/timer.c:1634 tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162 tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1194 __run_hrtimer kernel/time/hrtimer.c:1349 [inline] __hrtimer_run_queues+0x39c/0xec0 kernel/time/hrtimer.c:1411 hrtimer_interrupt+0x2a5/0x6f0 kernel/time/hrtimer.c:1469 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:857 Code: ea 03 80 3c 02 00 0f 85 8b 04 00 00 48 8b 83 f8 06 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d b8 38 01 00 00 48 89 f9 48 c1 e9 03 <0f> b6 14 11 48 89 f9 83 e1 07 38 ca 7f 08 84 d2 0f 85 90 03 00 RIP: __read_once_size include/linux/compiler.h:188 [inline] RSP: ffff8801db207930 RIP: get_running_cputimer include/linux/sched/cputime.h:85 [inline] RSP: ffff8801db207930 RIP: account_group_system_time include/linux/sched/cputime.h:149 [inline] RSP: ffff8801db207930 RIP: account_system_index_time+0xdd/0x5e0 kernel/sched/cputime.c:172 RSP: ffff8801db207930 ====================================================== WARNING: possible circular locking dependency detected 4.16.0-rc7+ #368 Not tainted ------------------------------------------------------ rcu_sched/8 is trying to acquire lock: ((console_sem).lock){..-.}, at: [<0000000011a525fb>] down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: (&rq->lock){-.-.}, at: [<000000004637b5ed>] rq_lock_irqsave kernel/sched/sched.h:1744 [inline] (&rq->lock){-.-.}, at: [<000000004637b5ed>] load_balance+0xb10/0x34c0 kernel/sched/fair.c:8548 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #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:1760 [inline] task_fork_fair+0x7a/0x690 kernel/sched/fair.c:9471 sched_fork+0x450/0xc10 kernel/sched/core.c:2405 copy_process.part.38+0x17c9/0x4bd0 kernel/fork.c:1763 copy_process kernel/fork.c:1606 [inline] _do_fork+0x1f7/0xf70 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:378 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:239 -> #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+0xbc/0x15f0 kernel/sched/core.c:1989 wake_up_process+0x10/0x20 kernel/sched/core.c:2152 __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:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 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 kasan_die_handler+0x31/0x3f arch/x86/mm/kasan_init_64.c:247 notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x77/0x140 kernel/notifier.c:193 notify_die+0x18c/0x280 kernel/notifier.c:549 do_general_protection+0x331/0x3e0 arch/x86/kernel/traps.c:558 general_protection+0x25/0x50 arch/x86/entry/entry_64.S:1150 task_group kernel/sched/sched.h:1203 [inline] can_migrate_task+0xe2/0x1c20 kernel/sched/fair.c:7102 detach_tasks kernel/sched/fair.c:7251 [inline] load_balance+0xdab/0x34c0 kernel/sched/fair.c:8555 idle_balance kernel/sched/fair.c:8837 [inline] pick_next_task_fair+0xe03/0x1630 kernel/sched/fair.c:6757 pick_next_task kernel/sched/core.c:3286 [inline] __schedule+0x4fc/0x1ec0 kernel/sched/core.c:3414 schedule+0xf5/0x430 kernel/sched/core.c:3499 schedule_timeout+0x118/0x230 kernel/time/timer.c:1801 rcu_gp_kthread+0x9dd/0x18e0 kernel/rcu/tree.c:2230 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406 other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->lock); lock(&p->pi_lock); lock(&rq->lock); lock((console_sem).lock); *** DEADLOCK *** 3 locks held by rcu_sched/8: #0: (rcu_read_lock){....}, at: [<0000000024de6645>] rcu_read_lock+0x0/0x70 include/linux/compiler.h:188 #1: (&rq->lock){-.-.}, at: [<000000004637b5ed>] rq_lock_irqsave kernel/sched/sched.h:1744 [inline] #1: (&rq->lock){-.-.}, at: [<000000004637b5ed>] load_balance+0xb10/0x34c0 kernel/sched/fair.c:8548 #2: (rcu_read_lock){....}, at: [<00000000c60bf25c>] rcu_read_unlock include/linux/rcupdate.h:682 [inline] #2: (rcu_read_lock){....}, at: [<00000000c60bf25c>] atomic_notifier_call_chain+0x0/0x140 kernel/notifier.c:184 stack backtrace: CPU: 1 PID: 8 Comm: rcu_sched Not tainted 4.16.0-rc7+ #368 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+0x194/0x24d 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+0x30a8/0x3e00 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 kasan_die_handler+0x31/0x3f arch/x86/mm/kasan_init_64.c:247 notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x77/0x140 kernel/notifier.c:193 notify_die+0x18c/0x280 kernel/notifier.c:549 do_general_protection+0x331/0x3e0 arch/x86/kernel/traps.c:558 general_protection+0x25/0x50 arch/x86/entry/entry_64.S:1150 RIP: 0010:task_group kernel/sched/sched.h:1203 [inline] RIP: 0010:can_migrate_task+0xe2/0x1c20 kernel/sched/fair.c:7102 RSP: 0018:ffff8801d9af6c88 EFLAGS: 00010006 RAX: dffffc0000000000 RBX: 0002810100028101 RCX: ffff8801d9af7098 RDX: ffff8801d9af6d30 RSI: 000050202000503c RDI: 00028101000281e1 RBP: ffff8801d9af6d58 R08: 1ffff1003b35ed9a R09: ffff88021fff8048 R10: 0000000000000001 R11: ffff88021fff805d R12: ffff8801b22d0300 R13: ffffffff87d5df20 R14: ffff8801b22d0300 R15: ffff8801b22d03f0 detach_tasks kernel/sched/fair.c:7251 [inline] load_balance+0xdab/0x34c0 kernel/sched/fair.c:8555 idle_balance kernel/sched/fair.c:8837 [inline] pick_next_task_fair+0xe03/0x1630 kernel/sched/fair.c:6757 pick_next_task kernel/sched/core.c:3286 [inline] __schedule+0x4fc/0x1ec0 kernel/sched/core.c:3414 schedule+0xf5/0x430 kernel/sched/core.c:3499 schedule_timeout+0x118/0x230 kernel/time/timer.c:1801 rcu_gp_kthread+0x9dd/0x18e0 kernel/rcu/tree.c:2230 ? __schedule+0x1 Lost 10 message(s)! ---[ end trace 948581b189460493 ]--- general protection fault: 0000 [#2] SMP KASAN Dumping ftrace buffer: