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-3,10.128.15.200' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz2.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 net.ipv6.conf.syz4.router_solicitations = 0 net.ipv6.conf.syz6.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 67.326083] ------------[ cut here ]------------ [ 67.326862] WARNING: CPU: 0 PID: 4918 at kernel/kthread.c:87 free_kthread_struct+0xa2/0xe0 [ 67.328403] Kernel panic - not syncing: panic_on_warn set ... [ 67.328403] [ 67.329418] CPU: 0 PID: 4918 Comm: modprobe Not tainted 4.14.0-rc5-mm1+ #20 [ 67.330479] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.331729] Call Trace: [ 67.332090] [ 67.332402] dump_stack+0x194/0x257 [ 67.332910] ? arch_local_irq_restore+0x53/0x53 [ 67.334038] ? vsnprintf+0x1ed/0x1900 [ 67.334623] panic+0x1e4/0x41c [ 67.335107] ? refcount_error_report+0x214/0x214 [ 67.336018] ? show_regs_print_info+0x65/0x65 [ 67.336867] ? __warn+0x1a9/0x1e0 [ 67.337374] ? free_kthread_struct+0xa2/0xe0 [ 67.338003] __warn+0x1c4/0x1e0 [ 67.338563] ? free_kthread_struct+0xa2/0xe0 [ 67.339192] report_bug+0x211/0x2d0 [ 67.339710] fixup_bug+0x40/0x90 [ 67.340182] do_trap+0x260/0x390 [ 67.340665] do_error_trap+0x120/0x390 [ 67.341220] ? save_stack+0xa3/0xd0 [ 67.341733] ? do_trap+0x390/0x390 [ 67.342243] ? delayed_put_task_struct+0xca/0x3d0 [ 67.342907] ? free_kthread_struct+0xa2/0xe0 [ 67.343530] ? smp_apic_timer_interrupt+0x16b/0x700 [ 67.344211] ? apic_timer_interrupt+0x9d/0xb0 [ 67.344827] ? alloc_set_pte+0x71a/0x1880 [ 67.345422] ? filemap_map_pages+0x1080/0x15d0 [ 67.346049] ? __handle_mm_fault+0x1f57/0x39c0 [ 67.346676] ? handle_mm_fault+0x334/0x8d0 [ 67.350895] ? __do_page_fault+0x5bd/0xd60 [ 67.355122] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 67.359950] do_invalid_op+0x1b/0x20 [ 67.363636] invalid_op+0x18/0x20 [ 67.367067] RIP: 0010:free_kthread_struct+0xa2/0xe0 executing program executing program [ 67.372065] RSP: 0000:ffff8801db207768 EFLAGS: 00010206 [ 67.377413] RAX: ffff8801c431e680 RBX: ffff8801c548f400 RCX: ffffffff8148d7e2 [ 67.384659] RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8801c548f4b8 [ 67.391908] RBP: ffff8801db207770 R08: 0000000000000001 R09: 1ffff1003b640edc [ 67.399162] R10: ffff8801db2076a8 R11: 0000000000000004 R12: 1ffff1003b640ef0 [ 67.406415] R13: 1ffff1003b640ef4 R14: 0000000000000000 R15: ffff8801db2077e0 [ 67.413678] ? free_kthread_struct+0xa2/0xe0 [ 67.418064] ? free_kthread_struct+0xa2/0xe0 [ 67.422442] free_task+0x134/0x1a0 executing program [ 67.425965] ? arch_release_task_struct+0x10/0x10 [ 67.430805] ? atomic_notifier_call_chain+0xb9/0x140 [ 67.435890] __put_task_struct+0x229/0x3b0 [ 67.440107] ? free_task+0x1a0/0x1a0 [ 67.443831] delayed_put_task_struct+0xca/0x3d0 [ 67.448490] ? child_wait_callback+0x210/0x210 [ 67.453057] ? put_pid+0x183/0x1f0 [ 67.456583] ? task_active_pid_ns+0xd0/0xd0 [ 67.460902] ? rcu_process_callbacks+0x115c/0x17d0 [ 67.465811] ? put_pid+0x1f0/0x1f0 [ 67.469325] ? child_wait_callback+0x210/0x210 executing program executing program [ 67.473889] rcu_process_callbacks+0xd74/0x17d0 [ 67.478560] ? note_gp_changes+0x650/0x650 [ 67.482778] ? print_irqtrace_events+0x270/0x270 [ 67.487521] ? timerqueue_add+0x1e9/0x280 [ 67.491660] ? enqueue_hrtimer+0x162/0x490 [ 67.495882] ? __remove_hrtimer+0x190/0x190 [ 67.500203] ? check_noncircular+0x20/0x20 [ 67.504431] ? find_held_lock+0x35/0x1d0 [ 67.508494] ? clockevents_program_event+0x163/0x2e0 [ 67.513583] ? lock_downgrade+0x990/0x990 [ 67.517720] ? __lock_is_held+0xb6/0x140 [ 67.521777] __do_softirq+0x2d7/0xb85 executing program executing program [ 67.525555] ? lock_downgrade+0x990/0x990 [ 67.529675] ? __irqentry_text_end+0x4/0x4 [ 67.533880] ? do_raw_spin_trylock+0x190/0x190 [ 67.538441] ? do_timer+0x50/0x50 [ 67.541881] ? native_apic_msr_write+0x5c/0x80 [ 67.546452] ? lapic_next_event+0x54/0x80 [ 67.550601] ? clockevents_program_event+0x108/0x2e0 [ 67.555706] ? tick_program_event+0x7f/0xd0 [ 67.560024] ? __lock_is_held+0xb6/0x140 [ 67.564091] irq_exit+0x1cc/0x200 [ 67.567537] smp_apic_timer_interrupt+0x16b/0x700 executing program executing program [ 67.572356] ? smp_call_function_single_interrupt+0x640/0x640 [ 67.578211] ? _raw_spin_lock+0x32/0x40 [ 67.582159] ? handle_edge_irq+0x2b4/0x7c0 [ 67.586377] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 67.591198] apic_timer_interrupt+0x9d/0xb0 [ 67.595490] [ 67.597713] RIP: 0010:alloc_set_pte+0x71a/0x1880 [ 67.602447] RSP: 0000:ffff8801c402f3e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff11 [ 67.610144] RAX: dffffc0000000000 RBX: ffff8801c402fb80 RCX: ffffffff81987189 [ 67.617398] RDX: 1ffff10038805e98 RSI: ffffea00076cb000 RDI: ffffea00076cb020 executing program executing program executing program [ 67.624646] RBP: ffff8801c402f528 R08: 0000000000000001 R09: 1ffff10038805e0a [ 67.631887] R10: ffff8801c402ef88 R11: 0000000000000003 R12: 1ffff10038805e84 [ 67.639131] R13: 1ffff10038805e98 R14: 0000000000000025 R15: ffffea00076cafe0 [ 67.646393] ? alloc_set_pte+0x6a9/0x1880 [ 67.650545] ? do_swap_page+0x2c50/0x2c50 [ 67.654682] ? print_irqtrace_events+0x270/0x270 [ 67.659430] ? unlock_page+0x19f/0x270 [ 67.663315] ? __lock_is_held+0xb6/0x140 [ 67.667385] filemap_map_pages+0x1080/0x15d0 [ 67.671803] ? find_get_entries_tag+0xeb0/0xeb0 executing program executing program [ 67.676459] ? __lock_acquire+0x6aa/0x3d50 [ 67.680665] ? __lock_acquire+0x6aa/0x3d50 [ 67.684875] ? get_mem_cgroup_from_mm+0x49b/0x710 [ 67.689704] ? __lru_cache_add+0x2a4/0x410 [ 67.693930] ? __pagevec_lru_add+0x30/0x30 [ 67.698167] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 67.703346] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 67.708534] ? __lock_is_held+0xb6/0x140 [ 67.712592] ? check_noncircular+0x20/0x20 [ 67.716813] ? lru_cache_add+0x1c7/0x3a0 [ 67.720854] ? get_mem_cgroup_from_mm+0x710/0x710 executing program executing program [ 67.725668] ? lru_cache_add_file+0x20/0x20 [ 67.729979] ? __mem_cgroup_threshold+0x8f0/0x8f0 [ 67.734809] ? mark_held_locks+0xaf/0x100 [ 67.738934] ? find_held_lock+0x35/0x1d0 [ 67.742998] ? __handle_mm_fault+0x247c/0x39c0 [ 67.747569] ? lock_downgrade+0x990/0x990 [ 67.751714] ? do_raw_spin_trylock+0x190/0x190 [ 67.756288] ? lock_release+0xa40/0xa40 [ 67.760243] ? compat_start_thread+0x80/0x80 [ 67.764643] ? check_noncircular+0x20/0x20 [ 67.768875] __handle_mm_fault+0x1f57/0x39c0 [ 67.773281] ? __pmd_alloc+0x4e0/0x4e0 executing program executing program executing program [ 67.777152] ? preempt_notifier_dec+0x20/0x20 [ 67.781623] ? find_held_lock+0x35/0x1d0 [ 67.785662] ? handle_mm_fault+0x248/0x8d0 [ 67.789868] ? lock_downgrade+0x990/0x990 [ 67.794015] handle_mm_fault+0x334/0x8d0 [ 67.798062] ? down_read_trylock+0xdb/0x170 [ 67.802370] ? __do_page_fault+0x31e/0xd60 [ 67.806593] ? __handle_mm_fault+0x39c0/0x39c0 [ 67.811159] ? vmacache_find+0x5f/0x280 [ 67.815115] ? find_vma+0x30/0x150 [ 67.818642] __do_page_fault+0x5bd/0xd60 [ 67.822690] ? __schedule+0x2060/0x2060 executing program executing program executing program [ 67.826667] ? mm_fault_error+0x2c0/0x2c0 [ 67.830817] ? exit_to_usermode_loop+0x8c/0x310 [ 67.835478] do_page_fault+0xee/0x720 [ 67.839266] ? trace_hardirqs_off+0xd/0x10 [ 67.843487] ? __do_page_fault+0xd60/0xd60 [ 67.847703] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 67.853226] ? syscall_return_slowpath+0x2b3/0x510 [ 67.858153] ? retint_user+0x18/0x20 [ 67.861876] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 67.866718] page_fault+0x22/0x30 [ 67.870145] RIP: 0033:0x7fe25f595390 executing program [ 67.873837] RSP: 002b:00007ffeb59a5f08 EFLAGS: 00010202 [ 67.879182] RAX: 0000000000000000 RBX: 00007ffeb59a72a8 RCX: 0000563871b59660 [ 67.886425] RDX: 00005638719547f0 RSI: 00007ffeb59a72a8 RDI: 0000000000000004 [ 67.893680] RBP: 00007ffeb59a72a8 R08: 00007ffeb59a5f7c R09: 0000000000000000 [ 67.900928] R10: 0000000000000000 R11: 00007fe25f595390 R12: 0000000000000004 [ 67.908179] R13: 0000563871954608 R14: 0000000000000000 R15: 0000000000000000 [ 67.916013] Dumping ftrace buffer: [ 67.919582] (ftrace buffer empty) [ 67.923259] Kernel Offset: disabled [ 67.926856] Rebooting in 86400 seconds..