[....] 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. [ 27.936517] kauditd_printk_skb: 8 callbacks suppressed [ 27.936529] audit: type=1800 audit(1541599041.416:29): pid=5575 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 27.961501] audit: type=1800 audit(1541599041.416:30): pid=5575 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.38' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 72.009911] kasan: CONFIG_KASAN_INLINE enabled [ 72.014876] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 72.022296] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 72.028529] CPU: 1 PID: 5731 Comm: syz-executor772 Not tainted 4.20.0-rc1-next-20181107+ #107 [ 72.037180] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.046694] RIP: 0010:__x86_indirect_thunk_rbx+0x10/0x20 [ 72.052442] Code: 90 0f ae e8 eb f9 48 89 04 24 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e8 07 00 00 00 f3 90 0f ae e8 eb f9 48 89 1c 24 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e8 07 00 00 00 f3 [ 72.071769] RSP: 0018:ffff8801b9d972b0 EFLAGS: 00010293 [ 72.077252] RAX: ffff8801d3afc700 RBX: 894cdffffc000000 RCX: ffffffff81ed555d [ 72.084927] RDX: 0000000000000000 RSI: ffffffff81ed5c9e RDI: ffff8801b9d97338 [ 72.092194] RBP: ffff8801b9d974a0 R08: ffff8801d3afc700 R09: ffffed003b5e5b67 [ 72.099571] R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff8801d3994540 [ 72.106833] R13: ffff8801b9d97338 R14: 1ffff100373b2e5b R15: dffffc0000000000 [ 72.114362] FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 72.122699] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 72.128580] CR2: 0000000020000000 CR3: 000000000946a000 CR4: 00000000001406e0 [ 72.135958] Call Trace: [ 72.138546] ? locks_remove_flock+0x236/0x350 [ 72.143175] ? flock_lock_inode+0x11c0/0x11c0 [ 72.147775] ? mark_held_locks+0x130/0x130 [ 72.152018] ? unwind_dump+0x190/0x190 [ 72.156151] ? is_bpf_text_address+0xd3/0x170 [ 72.160892] ? kernel_text_address+0x79/0xf0 [ 72.165302] ? __kernel_text_address+0xd/0x40 [ 72.169915] ? unwind_get_return_address+0x61/0xa0 [ 72.175190] ? __save_stack_trace+0x8d/0xf0 [ 72.179661] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.185325] locks_remove_file+0x148/0x5c0 [ 72.189563] ? fcntl_setlk+0xfc0/0xfc0 [ 72.193447] ? fsnotify_first_mark+0x350/0x350 [ 72.198022] ? __fsnotify_parent+0xcc/0x420 [ 72.202424] ? perf_trace_sched_process_exec+0x860/0x860 [ 72.207883] ? fsnotify+0xf20/0xf20 [ 72.211625] ? __might_sleep+0x95/0x190 [ 72.215835] __fput+0x2f0/0xa70 [ 72.219115] ? get_max_files+0x20/0x20 [ 72.223000] ? trace_hardirqs_on+0xbd/0x310 [ 72.227324] ? kasan_check_read+0x11/0x20 [ 72.231655] ? task_work_run+0x1af/0x2a0 [ 72.235722] ? trace_hardirqs_off_caller+0x300/0x300 [ 72.240822] ____fput+0x15/0x20 [ 72.244101] task_work_run+0x1e8/0x2a0 [ 72.247987] ? task_work_cancel+0x240/0x240 [ 72.252304] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 72.257830] ? switch_task_namespaces+0x9d/0xd0 [ 72.262501] do_exit+0x1ad1/0x26d0 [ 72.266033] ? lock_downgrade+0x900/0x900 [ 72.270170] ? check_preemption_disabled+0x48/0x280 [ 72.275179] ? rcu_read_unlock_special+0x181/0x1c0 [ 72.280208] ? mm_update_next_owner+0x990/0x990 [ 72.284868] ? rcu_softirq_qs+0x20/0x20 [ 72.288830] ? rcu_softirq_qs+0x20/0x20 [ 72.292786] ? unwind_dump+0x190/0x190 [ 72.296663] ? is_bpf_text_address+0xd3/0x170 [ 72.301185] ? kernel_text_address+0x79/0xf0 [ 72.305660] ? __kernel_text_address+0xd/0x40 [ 72.310143] ? unwind_get_return_address+0x61/0xa0 [ 72.315068] ? __save_stack_trace+0x8d/0xf0 [ 72.319386] ? save_stack+0xa9/0xd0 [ 72.322997] ? save_stack+0x43/0xd0 [ 72.326614] ? __kasan_slab_free+0x102/0x150 [ 72.331021] ? kasan_slab_free+0xe/0x10 [ 72.334982] ? kmem_cache_free+0x83/0x290 [ 72.339164] ? locks_free_lock+0x295/0x420 [ 72.343429] ? __x64_sys_flock+0x289/0x350 [ 72.347664] ? do_syscall_64+0x1b9/0x820 [ 72.351711] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 72.357066] ? trace_hardirqs_off+0xb8/0x310 [ 72.361475] ? kasan_check_read+0x11/0x20 [ 72.365616] ? do_raw_spin_unlock+0xa7/0x330 [ 72.370140] ? trace_hardirqs_off+0xb8/0x310 [ 72.374656] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.380233] ? check_preemption_disabled+0x48/0x280 [ 72.385255] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 72.390780] ? rcu_pm_notify+0xc0/0xc0 [ 72.394660] ? locks_free_lock+0x295/0x420 [ 72.398879] ? locks_free_lock+0x295/0x420 [ 72.403098] ? rcu_read_lock_sched_held+0x14f/0x180 [ 72.408102] ? kmem_cache_free+0x24f/0x290 [ 72.412321] ? locks_free_lock+0x295/0x420 [ 72.416548] ? leases_conflict+0x190/0x190 [ 72.420771] ? locks_mandatory_area+0x6a0/0x6a0 [ 72.425431] ? apparmor_path_rmdir+0x30/0x30 [ 72.429828] do_group_exit+0x177/0x440 [ 72.433716] ? trace_hardirqs_on+0xbd/0x310 [ 72.438027] ? __ia32_sys_exit+0x50/0x50 [ 72.442081] ? trace_hardirqs_off_caller+0x300/0x300 [ 72.447177] __x64_sys_exit_group+0x3e/0x50 [ 72.451495] do_syscall_64+0x1b9/0x820 [ 72.455376] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 72.460844] ? syscall_return_slowpath+0x5e0/0x5e0 [ 72.465769] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 72.470603] ? trace_hardirqs_on_caller+0x310/0x310 [ 72.475916] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 72.480931] ? prepare_exit_to_usermode+0x291/0x3b0 [ 72.485947] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 72.491117] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 72.496567] RIP: 0033:0x43ec48 [ 72.499845] Code: Bad RIP value. [ 72.503209] RSP: 002b:00007ffcf2929878 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 72.511273] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ec48 [ 72.518553] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 72.525915] RBP: 00000000004be508 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 72.533807] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 72.541443] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 72.548977] Modules linked in: [ 72.552970] ---[ end trace 97b94408e1f327ab ]--- [ 72.557877] RIP: 0010:__x86_indirect_thunk_rbx+0x10/0x20 [ 72.563992] Code: 90 0f ae e8 eb f9 48 89 04 24 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e8 07 00 00 00 f3 90 0f ae e8 eb f9 48 89 1c 24 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e8 07 00 00 00 f3 [ 72.583154] RSP: 0018:ffff8801b9d972b0 EFLAGS: 00010293 [ 72.588655] RAX: ffff8801d3afc700 RBX: 894cdffffc000000 RCX: ffffffff81ed555d [ 72.596096] RDX: 0000000000000000 RSI: ffffffff81ed5c9e RDI: ffff8801b9d97338 [ 72.603399] RBP: ffff8801b9d974a0 R08: ffff8801d3afc700 R09: ffffed003b5e5b67 [ 72.610973] R10: ffffed003b5e5b67 R11: ffff8801daf2db3b R12: ffff8801d3994540 [ 72.618485] R13: ffff8801b9d97338 R14: 1ffff100373b2e5b R15: dffffc0000000000 [ 72.625795] FS: 00000000023da880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 72.634060] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 72.640084] CR2: 000000000043ec1e CR3: 000000000946a000 CR4: 00000000001406e0 [ 72.647394] Kernel panic - not syncing: Fatal exception [ 72.653896] Kernel Offset: disabled [ 72.657533] Rebooting in 86400 seconds..