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-1,10.128.0.48' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 69.368248] ------------[ cut here ]------------ [ 69.369106] WARNING: CPU: 0 PID: 6115 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 69.370556] Kernel panic - not syncing: panic_on_warn set ... [ 69.370556] [ 69.371575] CPU: 0 PID: 6115 Comm: modprobe Not tainted 4.14.0-rc5-mm1+ #20 [ 69.372520] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.373769] Call Trace: [ 69.374134] [ 69.374453] dump_stack+0x194/0x257 [ 69.374990] ? arch_local_irq_restore+0x53/0x53 [ 69.375655] ? vsnprintf+0x1ed/0x1900 [ 69.376192] panic+0x1e4/0x41c [ 69.376635] ? refcount_error_report+0x214/0x214 [ 69.377497] ? show_regs_print_info+0x65/0x65 [ 69.378148] ? __warn+0x1a9/0x1e0 [ 69.378639] ? free_kthread_struct+0xa2/0xe0 [ 69.379243] __warn+0x1c4/0x1e0 [ 69.379722] ? free_kthread_struct+0xa2/0xe0 [ 69.380332] report_bug+0x211/0x2d0 [ 69.380851] fixup_bug+0x40/0x90 [ 69.381324] do_trap+0x260/0x390 [ 69.381809] do_error_trap+0x120/0x390 [ 69.382348] ? save_stack+0xa3/0xd0 [ 69.382858] ? do_trap+0x390/0x390 [ 69.383402] ? delayed_put_task_struct+0xca/0x3d0 [ 69.384112] ? free_kthread_struct+0xa2/0xe0 [ 69.384716] ? smp_apic_timer_interrupt+0x16b/0x700 [ 69.385416] ? apic_timer_interrupt+0x9d/0xb0 [ 69.386031] ? lock_acquire+0x256/0x580 [ 69.386607] ? _raw_spin_lock+0x2a/0x40 [ 69.387156] ? unmap_page_range+0xc5d/0x22e0 [ 69.387760] ? unmap_single_vma+0x15f/0x2d0 [ 69.388387] ? unmap_vmas+0xf1/0x1b0 [ 69.392099] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 69.396937] do_invalid_op+0x1b/0x20 [ 69.400645] invalid_op+0x18/0x20 [ 69.404090] RIP: 0010:free_kthread_struct+0xa2/0xe0 [ 69.409088] RSP: 0018:ffff8801db207768 EFLAGS: 00010206 executing program executing program executing program [ 69.414445] RAX: ffff8801c27142c0 RBX: ffff8801c556af00 RCX: ffffffff8148d7e2 [ 69.421712] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801c556afb8 [ 69.428980] RBP: ffff8801db207770 R08: 0000000000000001 R09: 1ffff1003b640edc [ 69.436249] R10: ffff8801db2076a8 R11: 0000000000000002 R12: 1ffff1003b640ef0 [ 69.443518] R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0 [ 69.450794] ? free_kthread_struct+0xa2/0xe0 [ 69.455211] ? free_kthread_struct+0xa2/0xe0 [ 69.459624] free_task+0x134/0x1a0 [ 69.463172] ? arch_release_task_struct+0x10/0x10 executing program executing program executing program executing program [ 69.468023] ? atomic_notifier_call_chain+0xb9/0x140 [ 69.473137] __put_task_struct+0x229/0x3b0 [ 69.477380] ? free_task+0x1a0/0x1a0 [ 69.481119] delayed_put_task_struct+0xca/0x3d0 [ 69.485794] ? child_wait_callback+0x210/0x210 [ 69.490378] ? put_pid+0x183/0x1f0 [ 69.493920] ? task_active_pid_ns+0xd0/0xd0 [ 69.498242] ? trace_hardirqs_on_caller+0x19e/0x5c0 [ 69.503247] ? put_pid+0x1f0/0x1f0 [ 69.506773] ? child_wait_callback+0x210/0x210 [ 69.511352] rcu_process_callbacks+0xd74/0x17d0 executing program [ 69.516032] ? note_gp_changes+0x650/0x650 [ 69.520259] ? print_irqtrace_events+0x270/0x270 [ 69.525018] ? timerqueue_add+0x1e9/0x280 [ 69.529154] ? enqueue_hrtimer+0x162/0x490 [ 69.533358] ? __remove_hrtimer+0x190/0x190 [ 69.537667] ? check_noncircular+0x20/0x20 [ 69.541878] ? find_held_lock+0x35/0x1d0 [ 69.545917] ? lock_downgrade+0x990/0x990 [ 69.550558] ? __lock_is_held+0xb6/0x140 [ 69.554610] __do_softirq+0x2d7/0xb85 [ 69.558387] ? lock_downgrade+0x990/0x990 [ 69.562521] ? __irqentry_text_end+0x4/0x4 [ 69.566742] ? do_raw_spin_trylock+0x190/0x190 [ 69.571312] ? do_timer+0x50/0x50 [ 69.574749] ? native_apic_msr_write+0x5c/0x80 [ 69.579301] ? lapic_next_event+0x54/0x80 [ 69.583426] ? clockevents_program_event+0x108/0x2e0 [ 69.588501] ? tick_program_event+0x7f/0xd0 [ 69.592801] ? __lock_is_held+0xb6/0x140 [ 69.596844] irq_exit+0x1cc/0x200 [ 69.600276] smp_apic_timer_interrupt+0x16b/0x700 [ 69.605098] ? smp_call_function_single_interrupt+0x640/0x640 [ 69.610953] ? _raw_spin_lock+0x32/0x40 [ 69.614920] ? handle_edge_irq+0x2b4/0x7c0 [ 69.619164] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 69.623998] ? unmap_page_range+0xc5d/0x22e0 [ 69.628390] apic_timer_interrupt+0x9d/0xb0 [ 69.632685] [ 69.634908] RIP: 0010:lock_acquire+0x256/0x580 [ 69.639468] RSP: 0018:ffff8801c2937140 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff11 [ 69.647154] RAX: dffffc0000000000 RBX: ffff8801c27142c0 RCX: 0000000000000000 [ 69.654410] RDX: 1ffffffff0b58f39 RSI: 00000000a7a0a48d RDI: 0000000000000282 [ 69.661663] RBP: ffff8801c2937238 R08: ffffffff8197e6fd R09: 0000000000000004 [ 69.668915] R10: ffff8801c2937120 R11: 0000000000000002 R12: 1ffff10038526e2e [ 69.676162] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 [ 69.683429] ? unmap_page_range+0xc5d/0x22e0 [ 69.687842] ? lock_downgrade+0x990/0x990 [ 69.691985] ? lock_release+0xa40/0xa40 [ 69.695962] ? rcu_note_context_switch+0x710/0x710 [ 69.700878] ? trace_event_raw_event_sched_switch+0x8a0/0x8a0 [ 69.706764] _raw_spin_lock+0x2a/0x40 [ 69.710553] ? unmap_page_range+0xc5d/0x22e0 [ 69.714974] unmap_page_range+0xc5d/0x22e0 [ 69.719239] ? vm_normal_page_pmd+0x280/0x280 [ 69.723729] ? rcu_read_lock_sched_held+0x108/0x120 [ 69.728735] ? __pagevec_lru_add_fn+0x783/0xf40 [ 69.733403] ? get_kernel_page+0x110/0x110 [ 69.737626] ? check_noncircular+0x20/0x20 [ 69.741840] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 69.747027] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 69.752216] ? find_held_lock+0x35/0x1d0 [ 69.756278] ? pagevec_lru_move_fn+0x178/0x230 [ 69.760848] ? lock_downgrade+0x990/0x990 [ 69.764987] ? uprobe_munmap+0x127/0x430 [ 69.769040] ? uprobe_mmap+0xc90/0xc90 [ 69.772927] ? _raw_spin_unlock_irqrestore+0x31/0xba [ 69.778037] unmap_single_vma+0x15f/0x2d0 [ 69.782189] unmap_vmas+0xf1/0x1b0 [ 69.785728] exit_mmap+0x232/0x530 [ 69.789255] ? SyS_munmap+0x30/0x30 [ 69.792877] ? __might_sleep+0x95/0x190 [ 69.796838] mmput+0x223/0x6c0 [ 69.800017] ? get_task_exe_file+0xc0/0xc0 [ 69.804233] ? is_current_pgrp_orphaned+0xa0/0xa0 [ 69.809060] ? do_exit+0x8f4/0x1ad0 [ 69.812684] ? lock_downgrade+0x990/0x990 [ 69.816831] ? do_raw_spin_trylock+0x190/0x190 [ 69.821406] ? down_read+0x96/0x150 [ 69.825017] ? do_exit+0x4ad/0x1ad0 [ 69.828636] ? __down_interruptible+0x6b0/0x6b0 [ 69.833291] ? trace_hardirqs_on+0xd/0x10 [ 69.837429] ? _raw_spin_unlock_irq+0x27/0x70 [ 69.841925] do_exit+0x904/0x1ad0 [ 69.845379] ? kernel_text_address+0x91/0x140 [ 69.849859] ? mm_update_next_owner+0x930/0x930 [ 69.854509] ? __kernel_text_address+0xd/0x40 [ 69.858974] ? unwind_get_return_address+0x61/0xa0 [ 69.863888] ? __save_stack_trace+0x7e/0xd0 [ 69.868205] ? depot_save_stack+0x12c/0x490 [ 69.872522] ? putname+0xee/0x130 [ 69.875965] ? save_stack+0xa3/0xd0 [ 69.879580] ? save_stack+0x43/0xd0 [ 69.883189] ? kasan_slab_free+0x71/0xc0 [ 69.887236] ? kmem_cache_free+0x77/0x280 [ 69.891368] ? putname+0xee/0x130 [ 69.894804] ? do_sys_open+0x31b/0x6d0 [ 69.898676] ? SyS_open+0x2d/0x40 [ 69.902110] ? entry_SYSCALL_64_fastpath+0x1f/0xbe [ 69.907023] ? check_noncircular+0x20/0x20 [ 69.911247] ? _raw_spin_unlock+0x22/0x30 [ 69.915378] ? find_held_lock+0x35/0x1d0 [ 69.919433] ? put_unused_fd+0x62/0x70 [ 69.923310] ? lock_downgrade+0x990/0x990 [ 69.927457] ? rcu_pm_notify+0xc0/0xc0 [ 69.931341] ? putname+0xee/0x130 [ 69.934788] ? putname+0xee/0x130 [ 69.938230] ? rcu_read_lock_sched_held+0x108/0x120 [ 69.943235] ? kmem_cache_free+0x249/0x280 [ 69.947462] ? putname+0xf3/0x130 [ 69.950912] do_group_exit+0x149/0x400 [ 69.954785] ? SyS_exit+0x30/0x30 [ 69.958209] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 69.963211] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 69.967961] SyS_exit_group+0x1d/0x20 [ 69.971749] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 69.976485] RIP: 0033:0x7fa20bc591e8 [ 69.980175] RSP: 002b:00007ffdce4fde88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 69.987870] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fa20bc591e8 [ 69.995122] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 [ 70.002374] RBP: 0000000000000082 R08: 00000000000000e7 R09: ffffffffffffffa8 [ 70.009623] R10: 00007fa20bf34740 R11: 0000000000000246 R12: 00005583d465f090 [ 70.016873] R13: 00007ffdce4fcbc0 R14: 0000000000000000 R15: 0000000000000000 [ 70.024684] Dumping ftrace buffer: [ 70.028269] (ftrace buffer empty) [ 70.031946] Kernel Offset: disabled [ 70.035542] Rebooting in 86400 seconds..