Debian GNU/Linux 7 syzkaller ttyS0 2017/11/02 12:17:13 parsed 1 programs 2017/11/02 12:17:13 executed programs: 0 syzkaller login: [ 27.346104] ------------[ cut here ]------------ [ 27.346570] WARNING: CPU: 3 PID: 3143 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 27.347359] Kernel panic - not syncing: panic_on_warn set ... [ 27.347359] [ 27.348018] CPU: 3 PID: 3143 Comm: syz-executor5 Not tainted 4.14.0-rc7-next-20171102+ #9 [ 27.348748] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 27.349476] Call Trace: [ 27.349793] [ 27.349997] dump_stack+0x194/0x257 [ 27.350337] ? arch_local_irq_restore+0x53/0x53 [ 27.350769] ? vsnprintf+0x1ed/0x1900 [ 27.351126] panic+0x1e4/0x41c [ 27.351421] ? refcount_error_report+0x214/0x214 [ 27.351846] ? show_regs_print_info+0x65/0x65 [ 27.352285] ? __warn+0x1a9/0x1e0 [ 27.352616] ? free_kthread_struct+0xa2/0xe0 [ 27.353021] __warn+0x1c4/0x1e0 [ 27.353329] ? free_kthread_struct+0xa2/0xe0 [ 27.353799] report_bug+0x211/0x2d0 [ 27.354142] fixup_bug+0x40/0x90 [ 27.354453] do_trap+0x260/0x390 [ 27.354795] do_error_trap+0x120/0x390 [ 27.355150] ? save_stack+0xa3/0xd0 [ 27.355501] ? do_trap+0x390/0x390 [ 27.355832] ? free_kthread_struct+0xa2/0xe0 [ 27.356258] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.356708] do_invalid_op+0x1b/0x20 [ 27.357048] invalid_op+0x18/0x20 [ 27.357359] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 27.357816] RSP: 0018:ffff88006df07768 EFLAGS: 00010206 [ 27.358296] RAX: ffff880068c28080 RBX: ffff88006afcc840 RCX: ffffffff814937d2 [ 27.359001] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff88006afcc9c8 [ 27.359642] RBP: ffff88006df07770 R08: ffff88006df1f568 R09: 1ffff1000dbe0ed4 [ 27.360271] R10: ffff880068c28080 R11: 0000000000000003 R12: 1ffff1000dbe0ef0 [ 27.360912] R13: 1ffff1000dbe0ef4 R14: 0000000000000000 R15: ffff88006df077e0 [ 27.361586] ? free_kthread_struct+0xa2/0xe0 [ 27.362009] ? free_kthread_struct+0xa2/0xe0 [ 27.362411] free_task+0x134/0x1a0 [ 27.362735] ? arch_release_task_struct+0x10/0x10 [ 27.363175] ? atomic_notifier_call_chain+0xb9/0x140 [ 27.363641] __put_task_struct+0x229/0x3b0 [ 27.364022] ? free_task+0x1a0/0x1a0 [ 27.364385] delayed_put_task_struct+0xca/0x3d0 [ 27.364810] ? child_wait_callback+0x210/0x210 [ 27.365230] ? put_pid+0x183/0x1f0 [ 27.365460] ? task_active_pid_ns+0xd0/0xd0 [ 27.366134] ? rcu_read_lock_sched_held+0x108/0x120 [ 27.366602] ? kmem_cache_free+0x249/0x280 [ 27.366996] ? put_pid+0x1f0/0x1f0 [ 27.367327] ? child_wait_callback+0x210/0x210 [ 27.367756] rcu_process_callbacks+0xd74/0x17d0 [ 27.368209] ? rcu_gp_kthread+0x18e0/0x18e0 [ 27.368612] ? print_usage_bug+0x480/0x480 [ 27.369086] ? perf_trace_lock+0x4d6/0x900 [ 27.369490] ? timerqueue_add+0x1e9/0x280 [ 27.369958] ? find_held_lock+0x39/0x1d0 [ 27.370706] ? check_noncircular+0x20/0x20 [ 27.371120] ? lock_downgrade+0x990/0x990 [ 27.371546] ? lock_acquire+0x1d5/0x580 [ 27.371888] ? clockevents_program_event+0x163/0x2e0 [ 27.372360] ? __lock_is_held+0xbc/0x140 [ 27.372761] __do_softirq+0x29d/0xbb2 [ 27.373116] ? __irqentry_text_end+0x4/0x4 [ 27.373516] ? do_raw_spin_trylock+0x190/0x190 [ 27.373955] ? do_timer+0x50/0x50 [ 27.374273] ? native_apic_msr_write+0x5c/0x80 [ 27.374681] ? lapic_next_event+0x54/0x80 [ 27.375044] ? clockevents_program_event+0x108/0x2e0 [ 27.375495] ? tick_program_event+0x7f/0xd0 [ 27.375879] ? __lock_is_held+0xbc/0x140 [ 27.376253] irq_exit+0x1d3/0x210 [ 27.376561] smp_apic_timer_interrupt+0x16b/0x700 [ 27.376982] ? smp_reschedule_interrupt+0xe6/0x670 [ 27.377413] ? smp_call_function_single_interrupt+0x640/0x640 [ 27.378030] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.378471] apic_timer_interrupt+0x9d/0xb0 [ 27.378849] [ 27.379053] RIP: 0010:qlist_free_all+0xa9/0x160 [ 27.379453] RSP: 0018:ffff8800682b76c8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11 [ 27.380116] RAX: 0000000000000007 RBX: 0000000000000286 RCX: 0000000000000006 [ 27.380742] RDX: 0000000000000000 RSI: ffff880068c28938 RDI: 0000000000000286 [ 27.381414] RBP: ffff8800682b7700 R08: ffff88006df1f4c0 R09: 0000000000000000 [ 27.382025] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 27.382641] R13: ffff88006d831c40 R14: ffff88003a67d148 R15: ffffffff85ecb380 [ 27.383333] quarantine_reduce+0x141/0x170 [ 27.383717] kasan_kmalloc+0xca/0xe0 [ 27.384058] kasan_slab_alloc+0x12/0x20 [ 27.384416] kmem_cache_alloc+0x11b/0x760 [ 27.384779] ? __lookup_hash+0x38/0x190 [ 27.385145] alloc_inode+0x128/0x180 [ 27.385472] new_inode_pseudo+0x69/0x190 [ 27.385876] ? prune_icache_sb+0x1a0/0x1a0 [ 27.386190] ? down_read+0x150/0x150 [ 27.386456] ? mntput+0x66/0x90 [ 27.386769] new_inode+0x1c/0x40 [ 27.387064] debugfs_get_inode+0x1b/0x120 [ 27.387439] __debugfs_create_file+0x99/0x3e0 [ 27.387830] ? kmem_cache_alloc_trace+0x459/0x750 [ 27.388271] debugfs_create_file+0x57/0x70 [ 27.388659] kvm_dev_ioctl+0xbb2/0x1890 [ 27.389021] ? install_new_memslots+0x420/0x420 [ 27.389423] ? lock_release+0xd70/0xd70 [ 27.390150] ? avc_has_extended_perms+0x7fa/0x12c0 [ 27.390917] ? lock_downgrade+0x990/0x990 [ 27.391303] ? avc_ss_reset+0x110/0x110 [ 27.391638] ? lock_release+0xd70/0xd70 [ 27.391992] ? __lock_is_held+0xbc/0x140 [ 27.392401] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 27.392898] ? get_unused_fd_flags+0x190/0x190 [ 27.393350] ? install_new_memslots+0x420/0x420 [ 27.393796] do_vfs_ioctl+0x1b1/0x1530 [ 27.394156] ? _cond_resched+0x14/0x30 [ 27.394526] ? ioctl_preallocate+0x2b0/0x2b0 [ 27.394918] ? selinux_capable+0x40/0x40 [ 27.395297] ? SyS_futex+0x269/0x390 [ 27.395660] ? security_file_ioctl+0x89/0xb0 [ 27.396056] SyS_ioctl+0x8f/0xc0 [ 27.396384] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 27.396811] RIP: 0033:0x447c89 [ 27.397102] RSP: 002b:00007ff4f83c4bd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 27.398374] RAX: ffffffffffffffda RBX: 00007ff4f83c56cc RCX: 0000000000447c89 [ 27.399078] RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 000000000000000a [ 27.399720] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 [ 27.400363] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 27.401013] R13: 0000000000000000 R14: 00007ff4f83c59c0 R15: 00007ff4f83c5700 [ 27.401833] Dumping ftrace buffer: [ 27.402252] (ftrace buffer empty) [ 27.402581] Kernel Offset: disabled [ 27.402899] Rebooting in 86400 seconds..