[....] 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. [ 27.319858] kauditd_printk_skb: 7 callbacks suppressed [ 27.319869] audit: type=1800 audit(1541594073.316:29): pid=5521 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 [ 27.365704] audit: type=1800 audit(1541594073.326:30): pid=5521 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 syzkaller login: [ 47.542262] sshd (5664) used greatest stack depth: 15744 bytes left Warning: Permanently added '10.128.0.95' (ECDSA) to the list of known hosts. executing program [ 53.918361] kasan: CONFIG_KASAN_INLINE enabled [ 53.923018] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 53.930437] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 53.936676] CPU: 0 PID: 5678 Comm: syz-executor207 Not tainted 4.20.0-rc1-next-20181107+ #107 [ 53.945314] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.954660] RIP: 0010:__x86_indirect_thunk_rbx+0x10/0x20 [ 53.960094] 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 [ 53.978979] RSP: 0018:ffff8801d70872b0 EFLAGS: 00010293 [ 53.984324] RAX: ffff8801ba6f42c0 RBX: 894cdffffc000000 RCX: ffffffff81ed555d [ 53.991584] RDX: 0000000000000000 RSI: ffffffff81ed5c9e RDI: ffff8801d7087338 [ 53.998850] RBP: ffff8801d70874a0 R08: ffff8801ba6f42c0 R09: ffffed003b5c5b67 [ 54.006106] R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801d1e8e800 [ 54.013377] R13: ffff8801d7087338 R14: 1ffff1003ae10e5b R15: dffffc0000000000 [ 54.020636] FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 54.028848] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 54.034767] CR2: 00007ffea75b7038 CR3: 000000000946a000 CR4: 00000000001406f0 [ 54.042027] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 54.049277] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 54.056525] Call Trace: [ 54.059100] ? locks_remove_flock+0x236/0x350 [ 54.063587] ? flock_lock_inode+0x11c0/0x11c0 [ 54.068067] ? mark_held_locks+0x130/0x130 [ 54.072283] ? unwind_dump+0x190/0x190 [ 54.076172] ? is_bpf_text_address+0xd3/0x170 [ 54.080652] ? kernel_text_address+0x79/0xf0 [ 54.085048] ? __kernel_text_address+0xd/0x40 [ 54.089524] ? unwind_get_return_address+0x61/0xa0 [ 54.094436] ? __save_stack_trace+0x8d/0xf0 [ 54.098741] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.104265] locks_remove_file+0x148/0x5c0 [ 54.108484] ? fcntl_setlk+0xfc0/0xfc0 [ 54.112356] ? fsnotify_first_mark+0x350/0x350 [ 54.116926] ? __fsnotify_parent+0xcc/0x420 [ 54.121230] ? perf_trace_sched_process_exec+0x860/0x860 [ 54.126663] ? fsnotify+0xf20/0xf20 [ 54.130279] ? __might_sleep+0x95/0x190 [ 54.134239] __fput+0x2f0/0xa70 [ 54.137502] ? get_max_files+0x20/0x20 [ 54.141373] ? trace_hardirqs_on+0xbd/0x310 [ 54.145678] ? kasan_check_read+0x11/0x20 [ 54.149806] ? task_work_run+0x1af/0x2a0 [ 54.153861] ? trace_hardirqs_off_caller+0x300/0x300 [ 54.158967] ____fput+0x15/0x20 [ 54.162229] task_work_run+0x1e8/0x2a0 [ 54.166098] ? task_work_cancel+0x240/0x240 [ 54.170406] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 54.175928] ? switch_task_namespaces+0x9d/0xd0 [ 54.180595] do_exit+0x1ad1/0x26d0 [ 54.184121] ? lock_downgrade+0x900/0x900 [ 54.188251] ? check_preemption_disabled+0x48/0x280 [ 54.193265] ? rcu_read_unlock_special+0x181/0x1c0 [ 54.198181] ? mm_update_next_owner+0x990/0x990 [ 54.202828] ? rcu_softirq_qs+0x20/0x20 [ 54.206791] ? rcu_softirq_qs+0x20/0x20 [ 54.210750] ? unwind_dump+0x190/0x190 [ 54.214627] ? is_bpf_text_address+0xd3/0x170 [ 54.219119] ? kernel_text_address+0x79/0xf0 [ 54.223512] ? __kernel_text_address+0xd/0x40 [ 54.227991] ? unwind_get_return_address+0x61/0xa0 [ 54.232903] ? __save_stack_trace+0x8d/0xf0 [ 54.237210] ? save_stack+0xa9/0xd0 [ 54.240818] ? save_stack+0x43/0xd0 [ 54.244433] ? __kasan_slab_free+0x102/0x150 [ 54.248820] ? kasan_slab_free+0xe/0x10 [ 54.252783] ? kmem_cache_free+0x83/0x290 [ 54.256913] ? locks_free_lock+0x295/0x420 [ 54.261126] ? __x64_sys_flock+0x289/0x350 [ 54.265344] ? do_syscall_64+0x1b9/0x820 [ 54.269404] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.274754] ? trace_hardirqs_off+0xb8/0x310 [ 54.279142] ? kasan_check_read+0x11/0x20 [ 54.283278] ? do_raw_spin_unlock+0xa7/0x330 [ 54.287686] ? trace_hardirqs_off+0xb8/0x310 [ 54.292078] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.297599] ? check_preemption_disabled+0x48/0x280 [ 54.302601] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 54.308126] ? rcu_pm_notify+0xc0/0xc0 [ 54.311995] ? locks_free_lock+0x295/0x420 [ 54.316214] ? locks_free_lock+0x295/0x420 [ 54.320430] ? rcu_read_lock_sched_held+0x14f/0x180 [ 54.325430] ? kmem_cache_free+0x24f/0x290 [ 54.329646] ? locks_free_lock+0x295/0x420 [ 54.333863] ? leases_conflict+0x190/0x190 [ 54.338110] ? locks_mandatory_area+0x6a0/0x6a0 [ 54.342760] ? apparmor_path_rmdir+0x30/0x30 [ 54.347153] do_group_exit+0x177/0x440 [ 54.351022] ? trace_hardirqs_on+0xbd/0x310 [ 54.355361] ? __ia32_sys_exit+0x50/0x50 [ 54.359405] ? trace_hardirqs_off_caller+0x300/0x300 [ 54.364493] __x64_sys_exit_group+0x3e/0x50 [ 54.368801] do_syscall_64+0x1b9/0x820 [ 54.373555] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 54.378909] ? syscall_return_slowpath+0x5e0/0x5e0 [ 54.383822] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.388651] ? trace_hardirqs_on_caller+0x310/0x310 [ 54.393650] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 54.398650] ? prepare_exit_to_usermode+0x291/0x3b0 [ 54.403648] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.408475] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.413648] RIP: 0033:0x43ec48 [ 54.416831] Code: Bad RIP value. [ 54.420178] RSP: 002b:00007ffea75ab848 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 54.427882] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ec48 [ 54.435135] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 54.442385] RBP: 00000000004be508 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 54.449636] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 54.456890] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 54.464146] Modules linked in: [ 54.467425] ---[ end trace bab34570fa3e8732 ]--- [ 54.472198] RIP: 0010:__x86_indirect_thunk_rbx+0x10/0x20 [ 54.477706] 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 [ 54.496632] RSP: 0018:ffff8801d70872b0 EFLAGS: 00010293 [ 54.501991] RAX: ffff8801ba6f42c0 RBX: 894cdffffc000000 RCX: ffffffff81ed555d [ 54.509276] RDX: 0000000000000000 RSI: ffffffff81ed5c9e RDI: ffff8801d7087338 [ 54.516582] RBP: ffff8801d70874a0 R08: ffff8801ba6f42c0 R09: ffffed003b5c5b67 [ 54.523939] R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801d1e8e800 [ 54.531223] R13: ffff8801d7087338 R14: 1ffff1003ae10e5b R15: dffffc0000000000 [ 54.538535] FS: 0000000000dca880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 54.546939] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 54.552808] CR2: 000000000043ec1e CR3: 000000000946a000 CR4: 00000000001406f0 [ 54.560094] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 54.567379] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 54.574678] Kernel panic - not syncing: Fatal exception [ 54.580911] Kernel Offset: disabled [ 54.584534] Rebooting in 86400 seconds..