Debian GNU/Linux 7 syzkaller ttyS0 2017/08/22 19:07:46 fuzzer started 2017/08/22 19:07:46 dialing manager at 10.0.2.10:34489 syzkaller login: [ 36.055089] watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [swapper/2:0] [ 36.055731] Modules linked in: [ 36.056008] irq event stamp: 24413099 [ 36.056334] hardirqs last enabled at (24413098): [] _raw_spin_unlock_irq+0x27/0x70 [ 36.057115] hardirqs last disabled at (24413099): [] apic_timer_interrupt+0x98/0xb0 [ 36.057888] softirqs last enabled at (83718): [] _local_bh_enable+0x1c/0x30 [ 36.058626] softirqs last disabled at (83719): [] irq_exit+0x1d3/0x210 [ 36.059312] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.13.0-rc6-next-20170822+ #6 [ 36.059953] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 36.060634] task: ffff88006dac6040 task.stack: ffff88006dac8000 [ 36.061142] RIP: 0010:_raw_spin_unlock_irq+0x56/0x70 [ 36.061565] RSP: 0018:ffff88006de07a90 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 [ 36.062210] RAX: dffffc0000000000 RBX: ffff88006de1c200 RCX: 0000000000000000 [ 36.062814] RDX: 1ffffffff0b5915f RSI: 0000000000000000 RDI: ffffffff85ac8af8 [ 36.063412] RBP: ffff88006de07a98 R08: ffff88006de073f8 R09: 0000000000000000 [ 36.064010] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88006de25200 [ 36.064606] R13: dffffc0000000000 R14: ffffffff8145b7a0 R15: ffff88006de07d70 [ 36.065205] FS: 0000000000000000(0000) GS:ffff88006de00000(0000) knlGS:0000000000000000 [ 36.065883] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.066372] CR2: 00007f26d4d461b0 CR3: 0000000069697000 CR4: 00000000000006e0 [ 36.066969] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.067573] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.068173] Call Trace: [ 36.068393] [ 36.068582] __run_timers+0x7ef/0xb90 [ 36.068910] ? msleep_interruptible+0x170/0x170 [ 36.069304] ? lock_acquire+0x1d5/0x580 [ 36.069639] ? __hrtimer_run_queues+0x385/0xe10 [ 36.070036] ? find_held_lock+0x39/0x1d0 [ 36.070391] ? lock_downgrade+0x990/0x990 [ 36.070748] ? lock_acquire+0x1d5/0x580 [ 36.071079] ? clockevents_program_event+0x163/0x2e0 [ 36.071513] ? pvclock_read_flags+0x160/0x160 [ 36.071891] ? rcu_pm_notify+0xc0/0xc0 [ 36.072225] run_timer_softirq+0x67/0x80 [ 36.072565] __do_softirq+0x2bb/0xbd0 [ 36.072896] ? __softirqentry_text_start+0x8/0x8 [ 36.073290] ? native_apic_msr_write+0x5c/0x80 [ 36.073669] ? lapic_next_event+0x5a/0x90 [ 36.074020] ? clockevents_program_event+0x108/0x2e0 [ 36.074414] ? tick_program_event+0x7f/0xd0 [ 36.074720] ? hrtimer_interrupt+0x489/0x5f0 [ 36.075271] irq_exit+0x1d3/0x210 [ 36.075558] smp_apic_timer_interrupt+0x76/0xa0 [ 36.075949] apic_timer_interrupt+0x9d/0xb0 [ 36.076309] [ 36.076502] RIP: 0010:native_safe_halt+0x6/0x10 [ 36.076891] RSP: 0018:ffff88006dacfdb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 [ 36.077536] RAX: dffffc0000000000 RBX: 1ffff1000db59fb9 RCX: 0000000000000000 [ 36.078135] RDX: 1ffffffff0b59160 RSI: 0000000000000001 RDI: ffffffff85ac8b00 [ 36.078743] RBP: ffff88006dacfdb0 R08: ffffffff85804a90 R09: 0000000000000000 [ 36.079341] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85ac8af0 [ 36.079937] R13: ffff88006dacfe68 R14: 0000000000000000 R15: ffff88006dac6040 [ 36.080565] default_idle+0xbf/0x460 [ 36.080882] ? __sched_text_end+0x4/0x4 [ 36.081226] ? tick_nohz_idle_enter+0xde/0x160 [ 36.081619] arch_cpu_idle+0xa/0x10 [ 36.081928] default_idle_call+0x36/0x90 [ 36.082267] do_idle+0x256/0x3b0 [ 36.082560] cpu_startup_entry+0x18/0x20 [ 36.082903] start_secondary+0x277/0x310 [ 36.083246] secondary_startup_64+0xa5/0xa5 [ 36.083624] Code: 8a ac 85 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 1d 48 83 3d 0b 10 d3 00 00 74 11 fb 66 0f 1f 44 00 00 <65> ff 0d d3 e9 27 7b 5b 5d c3 0f 0b e8 b9 c8 c8 fc eb dc 0f 1f [ 36.085534] Kernel panic - not syncing: softlockup: hung tasks [ 36.086030] CPU: 2 PID: 0 Comm: swapper/2 Tainted: G L 4.13.0-rc6-next-20170822+ #6 [ 36.086764] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 36.087432] Call Trace: [ 36.087648] [ 36.087833] dump_stack+0x194/0x257 [ 36.088136] ? arch_local_irq_restore+0x53/0x53 [ 36.088519] ? vprintk_default+0x28/0x30 [ 36.088860] ? vprintk_func+0x5e/0xc0 [ 36.089180] panic+0x1e4/0x41c [ 36.089450] ? refcount_error_report+0x214/0x214 [ 36.089864] watchdog_timer_fn+0x401/0x410 [ 36.090218] ? watchdog_park_threads+0x240/0x240 [ 36.090629] __hrtimer_run_queues+0x349/0xe10 [ 36.091008] ? watchdog_park_threads+0x240/0x240 [ 36.091408] ? hrtimer_cancel+0x40/0x40 [ 36.091748] ? pvclock_read_flags+0x160/0x160 [ 36.092124] ? lock_downgrade+0x990/0x990 [ 36.092481] ? kvm_clock_get_cycles+0x25/0x30 [ 36.092856] ? ktime_get_update_offsets_now+0x34a/0x520 [ 36.093308] ? do_timer+0x50/0x50 [ 36.093617] hrtimer_interrupt+0x1d4/0x5f0 [ 36.093986] ? destroy_worker+0x580/0x580 [ 36.094338] local_apic_timer_interrupt+0x6b/0xa0 [ 36.094744] smp_apic_timer_interrupt+0x71/0xa0 [ 36.095134] apic_timer_interrupt+0x9d/0xb0 [ 36.095474] RIP: 0010:_raw_spin_unlock_irq+0x56/0x70 [ 36.096090] RSP: 0018:ffff88006de07a90 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 [ 36.096713] RAX: dffffc0000000000 RBX: ffff88006de1c200 RCX: 0000000000000000 [ 36.097310] RDX: 1ffffffff0b5915f RSI: 0000000000000000 RDI: ffffffff85ac8af8 [ 36.097909] RBP: ffff88006de07a98 R08: ffff88006de073f8 R09: 0000000000000000 [ 36.098513] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88006de25200 [ 36.099112] R13: dffffc0000000000 R14: ffffffff8145b7a0 R15: ffff88006de07d70 [ 36.099714] ? destroy_worker+0x580/0x580 [ 36.100080] __run_timers+0x7ef/0xb90 [ 36.100411] ? msleep_interruptible+0x170/0x170 [ 36.100801] ? lock_acquire+0x1d5/0x580 [ 36.101129] ? __hrtimer_run_queues+0x385/0xe10 [ 36.101528] ? find_held_lock+0x39/0x1d0 [ 36.101882] ? lock_downgrade+0x990/0x990 [ 36.102234] ? lock_acquire+0x1d5/0x580 [ 36.102572] ? clockevents_program_event+0x163/0x2e0 [ 36.103012] ? pvclock_read_flags+0x160/0x160 [ 36.103388] ? rcu_pm_notify+0xc0/0xc0 [ 36.103727] run_timer_softirq+0x67/0x80 [ 36.104065] __do_softirq+0x2bb/0xbd0 [ 36.104397] ? __softirqentry_text_start+0x8/0x8 [ 36.104797] ? native_apic_msr_write+0x5c/0x80 [ 36.105178] ? lapic_next_event+0x5a/0x90 [ 36.105529] ? clockevents_program_event+0x108/0x2e0 [ 36.105961] ? tick_program_event+0x7f/0xd0 [ 36.106327] ? hrtimer_interrupt+0x489/0x5f0 [ 36.106713] irq_exit+0x1d3/0x210 [ 36.107006] smp_apic_timer_interrupt+0x76/0xa0 [ 36.107396] apic_timer_interrupt+0x9d/0xb0 [ 36.107752] [ 36.107944] RIP: 0010:native_safe_halt+0x6/0x10 [ 36.108324] RSP: 0018:ffff88006dacfdb0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10 [ 36.108966] RAX: dffffc0000000000 RBX: 1ffff1000db59fb9 RCX: 0000000000000000 [ 36.109561] RDX: 1ffffffff0b59160 RSI: 0000000000000001 RDI: ffffffff85ac8b00 [ 36.110157] RBP: ffff88006dacfdb0 R08: ffffffff85804a90 R09: 0000000000000000 [ 36.110759] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff85ac8af0 [ 36.111359] R13: ffff88006dacfe68 R14: 0000000000000000 R15: ffff88006dac6040 [ 36.111979] default_idle+0xbf/0x460 [ 36.112286] ? __sched_text_end+0x4/0x4 [ 36.112630] ? tick_nohz_idle_enter+0xde/0x160 [ 36.113020] arch_cpu_idle+0xa/0x10 [ 36.113326] default_idle_call+0x36/0x90 [ 36.113668] do_idle+0x256/0x3b0 [ 36.113958] cpu_startup_entry+0x18/0x20 [ 36.114303] start_secondary+0x277/0x310 [ 36.114648] secondary_startup_64+0xa5/0xa5 [ 36.115155] Dumping ftrace buffer: [ 36.115504] (ftrace buffer empty) [ 36.115815] Kernel Offset: disabled [ 36.116131] Rebooting in 86400 seconds..