INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-mmots-kasan-gce-2,10.128.15.202' (ECDSA) to the list of known hosts. 2017/09/29 03:27:48 parsed 1 programs 2017/09/29 03:27:48 executed programs: 0 syzkaller login: [ 26.813101] ------------[ cut here ]------------ [ 26.813958] WARNING: CPU: 0 PID: 4042 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 26.815473] Kernel panic - not syncing: panic_on_warn set ... [ 26.815473] [ 26.816470] CPU: 0 PID: 4042 Comm: syz-executor3 Not tainted 4.14.0-rc2-mm1+ #10 [ 26.817500] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.818753] Call Trace: [ 26.819278] [ 26.819652] dump_stack+0x194/0x257 [ 26.820175] ? arch_local_irq_restore+0x53/0x53 [ 26.820861] panic+0x1e4/0x417 [ 26.821316] ? __warn+0x1d9/0x1d9 [ 26.821985] ? show_regs_print_info+0x65/0x65 [ 26.822743] ? free_kthread_struct+0xa2/0xe0 [ 26.823373] __warn+0x1c4/0x1d9 [ 26.823838] ? free_kthread_struct+0xa2/0xe0 [ 26.824456] report_bug+0x211/0x2d0 [ 26.824976] fixup_bug+0x40/0x90 [ 26.825476] do_trap+0x260/0x390 [ 26.825966] do_error_trap+0x120/0x390 [ 26.826528] ? save_stack+0xa3/0xd0 [ 26.827047] ? do_trap+0x390/0x390 [ 26.827578] ? free_kthread_struct+0xa2/0xe0 [ 26.828210] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.828906] do_invalid_op+0x1b/0x20 [ 26.829565] invalid_op+0x18/0x20 [ 26.830057] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 26.830763] RSP: 0018:ffff8801db207768 EFLAGS: 00010206 [ 26.831505] RAX: ffff8801d1ad0200 RBX: ffff8801d562a300 RCX: 1ffff1003b640ee1 [ 26.832582] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801d562a488 [ 26.835799] RBP: ffff8801db207770 R08: 0000000000000000 R09: 1ffff1003b640ed4 [ 26.843061] R10: ffff8801d1ad0200 R11: 0000000000000001 R12: 1ffff1003b640ef0 [ 26.850318] R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0 [ 26.857624] ? free_kthread_struct+0xa2/0xe0 [ 26.862025] free_task+0x134/0x1a0 [ 26.865561] ? arch_release_task_struct+0x10/0x10 [ 26.870408] ? atomic_notifier_call_chain+0xb9/0x140 [ 26.875509] __put_task_struct+0x229/0x3b0 [ 26.879739] ? free_task+0x1a0/0x1a0 [ 26.883466] delayed_put_task_struct+0xca/0x3d0 [ 26.888134] ? child_wait_callback+0x210/0x210 [ 26.892708] ? put_pid+0x184/0x1f0 [ 26.896247] ? task_active_pid_ns+0xd0/0xd0 [ 26.900573] ? rcu_process_callbacks+0x115c/0x17d0 [ 26.905499] ? put_pid+0x1f0/0x1f0 [ 26.909033] ? child_wait_callback+0x210/0x210 [ 26.913615] rcu_process_callbacks+0xd74/0x17d0 [ 26.918300] ? note_gp_changes+0x650/0x650 [ 26.922537] ? timerqueue_add+0x1e9/0x280 [ 26.926690] ? find_held_lock+0x39/0x1d0 [ 26.930766] ? lock_downgrade+0x990/0x990 [ 26.934920] ? lock_acquire+0x1d5/0x580 [ 26.938889] ? clockevents_program_event+0x163/0x2e0 [ 26.944008] ? rcu_pm_notify+0xc0/0xc0 [ 26.947917] __do_softirq+0x29d/0xbb2 [ 26.951733] ? __irqentry_text_end+0x4/0x4 [ 26.955961] ? do_raw_spin_trylock+0x190/0x190 [ 26.960536] ? do_timer+0x50/0x50 [ 26.963985] ? native_apic_msr_write+0x5c/0x80 [ 26.968563] ? lapic_next_event+0x54/0x80 [ 26.972707] ? clockevents_program_event+0x108/0x2e0 [ 26.977808] ? tick_program_event+0x7f/0xd0 [ 26.982129] ? hrtimer_interrupt+0x489/0x5f0 [ 26.986535] ? rcu_pm_notify+0xc0/0xc0 [ 26.990436] irq_exit+0x1d3/0x210 [ 26.993886] smp_apic_timer_interrupt+0x16b/0x700 [ 26.998721] ? smp_reschedule_interrupt+0xe6/0x670 [ 27.003639] ? smp_call_function_single_interrupt+0x640/0x640 [ 27.009525] ? _raw_spin_lock+0x32/0x40 [ 27.013508] ? handle_edge_irq+0x2b4/0x7c0 [ 27.017756] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.022607] ? kvfree+0x36/0x60 [ 27.025880] apic_timer_interrupt+0x9d/0xb0 [ 27.030187] [ 27.032418] RIP: 0010:kfree+0xf7/0x250 [ 27.036292] RSP: 0018:ffff8801d39870b0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11 [ 27.044010] RAX: 0000000000000007 RBX: ffff8801b4760d40 RCX: 0000000000000000 [ 27.051279] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000286 [ 27.058539] RBP: ffff8801d39870d0 R08: 0000000000000000 R09: 0000000000000000 [ 27.065796] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 [ 27.073059] R13: ffff8801dac02500 R14: ffffffff8192b526 R15: ffff8801b4720da8 [ 27.080334] ? kvfree+0x36/0x60 [ 27.083641] kvfree+0x36/0x60 [ 27.086752] kvm_free_memslots+0xaf/0xd0 [ 27.090817] kvm_put_kvm+0x916/0xde0 [ 27.094541] ? kvm_clear_guest+0xb0/0xb0 [ 27.098642] ? fcntl_setlk+0x10d0/0x10d0 [ 27.102708] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.107217] ? kvm_irqfd_release+0xdd/0x120 [ 27.111531] ? kvm_irqfd_release+0xdd/0x120 [ 27.115850] ? kvm_put_kvm+0xde0/0xde0 [ 27.119731] kvm_vm_release+0x42/0x50 [ 27.123529] __fput+0x333/0x7f0 [ 27.126814] ? fput+0x140/0x140 [ 27.130096] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.134599] ____fput+0x15/0x20 [ 27.137875] task_work_run+0x199/0x270 [ 27.141762] ? task_work_cancel+0x210/0x210 [ 27.146083] ? _raw_spin_unlock+0x22/0x30 [ 27.150225] ? switch_task_namespaces+0x87/0xc0 [ 27.154897] do_exit+0x9c8/0x1b00 [ 27.158347] ? __might_sleep+0x95/0x190 [ 27.162330] ? mm_update_next_owner+0x930/0x930 [ 27.167003] ? mutex_unlock+0xd/0x10 [ 27.170711] ? kvm_arch_vm_ioctl+0x64e/0x1cf0 [ 27.175204] ? kvm_vm_ioctl_irq_line+0x150/0x150 [ 27.179958] ? __lock_acquire+0x732/0x4620 [ 27.184184] ? pvclock_read_flags+0x160/0x160 [ 27.188691] ? __lock_is_held+0xbc/0x140 [ 27.192749] ? check_noncircular+0x20/0x20 [ 27.196981] ? debug_check_no_locks_freed+0x3d0/0x3d0 [ 27.202172] ? ctx_sched_in+0xca/0x1610 [ 27.206167] ? find_held_lock+0x39/0x1d0 [ 27.210245] ? lock_downgrade+0x990/0x990 [ 27.214387] ? recalc_sigpending_tsk+0x117/0x150 [ 27.219141] ? recalc_sigpending+0x103/0x160 [ 27.223547] ? recalc_sigpending_tsk+0x150/0x150 [ 27.228291] ? get_signal+0x2b2/0x16d0 [ 27.232201] do_group_exit+0x149/0x400 [ 27.236087] ? __lock_is_held+0xbc/0x140 [ 27.240144] ? SyS_exit+0x30/0x30 [ 27.243593] ? _raw_spin_unlock_irq+0x27/0x70 [ 27.248089] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.253106] get_signal+0x73f/0x16d0 [ 27.256834] ? ptrace_notify+0x130/0x130 [ 27.260891] ? find_held_lock+0x39/0x1d0 [ 27.264965] ? lock_downgrade+0x990/0x990 [ 27.269125] ? __fget+0xbb/0x580 [ 27.272498] do_signal+0x94/0x1ee0 [ 27.276029] ? lock_release+0xd70/0xd70 [ 27.280001] ? __lock_is_held+0xbc/0x140 [ 27.284061] ? setup_sigcontext+0x7d0/0x7d0 [ 27.288393] ? __fget+0x362/0x580 [ 27.291888] ? exit_to_usermode_loop+0x8c/0x310 [ 27.296566] exit_to_usermode_loop+0x214/0x310 [ 27.301150] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 27.306679] ? selinux_capable+0x40/0x40 [ 27.310752] syscall_return_slowpath+0x42f/0x510 [ 27.315508] ? prepare_exit_to_usermode+0x2d0/0x2d0 [ 27.320524] ? entry_SYSCALL_64_fastpath+0x91/0xbe [ 27.325451] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.330463] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 27.335224] entry_SYSCALL_64_fastpath+0xbc/0xbe [ 27.339969] RIP: 0033:0x4520a9 [ 27.343147] RSP: 002b:00007f9024112c08 EFLAGS: 00000216 ORIG_RAX: 0000000000000010 [ 27.350856] RAX: fffffffffffffff4 RBX: 0000000000718000 RCX: 00000000004520a9 [ 27.358117] RDX: 000000002057afc0 RSI: 000000004040ae77 RDI: 0000000000000007 [ 27.365378] RBP: 0000000000002240 R08: 0000000000000000 R09: 0000000000000000 [ 27.372639] R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004b8bfa [ 27.379900] R13: 00000000ffffffff R14: 0000000000000007 R15: 000000004040ae77 [ 27.387796] Dumping ftrace buffer: [ 27.391381] (ftrace buffer empty) [ 27.395060] Kernel Offset: disabled [ 27.398662] Rebooting in 86400 seconds..