[ 23.531233] audit: type=1800 audit(1541647325.175:21): pid=5475 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2419 res=0 [ 23.551537] audit: type=1800 audit(1541647325.175:22): pid=5475 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2447 res=0 [....] Starting enhanced syslogd: rsyslogd[ 23.892663] rsyslogd (5501) used greatest stack depth: 15824 bytes left [?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 syzkaller login: [ 42.535496] sshd (5618) used greatest stack depth: 15744 bytes left Warning: Permanently added '10.128.0.25' (ECDSA) to the list of known hosts. executing program [ 53.350021] hrtimer: interrupt took 62791 ns [ 53.355945] kasan: CONFIG_KASAN_INLINE enabled [ 53.360823] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 53.368283] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 53.374663] CPU: 0 PID: 5632 Comm: syz-executor756 Not tainted 4.20.0-rc1-next-20181107+ #107 [ 53.383322] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.392686] RIP: 0010:locks_remove_flock+0x216/0x350 [ 53.397780] Code: 00 0f 85 3a 01 00 00 48 8b 5b 98 48 85 db 74 3a e8 1f 41 92 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 17 01 00 00 48 8b 5b 08 48 85 db 74 0d e8 f2 40 [ 53.416672] RSP: 0018:ffff8801bc5972c0 EFLAGS: 00010206 [ 53.422018] RAX: dffffc0000000000 RBX: 1ffff100378b2e89 RCX: ffffffff81ed555d [ 53.429272] RDX: 03fffe2006f165d2 RSI: ffffffff81ed5c71 RDI: 1ffff100378b2e91 [ 53.436525] RBP: ffff8801bc5974a0 R08: ffff8801d74dc200 R09: ffffed003b5c5b67 [ 53.443789] R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801d74c2000 [ 53.451054] R13: ffff8801bc597338 R14: 1ffff100378b2e5b R15: dffffc0000000000 [ 53.458760] FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 53.466978] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 53.472843] CR2: 000000002001d000 CR3: 000000000946a000 CR4: 00000000001406f0 [ 53.480115] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 53.487374] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.494640] Call Trace: [ 53.497231] ? flock_lock_inode+0x11c0/0x11c0 [ 53.501722] ? mark_held_locks+0x130/0x130 [ 53.506003] ? unwind_dump+0x190/0x190 [ 53.509916] ? is_bpf_text_address+0xd3/0x170 [ 53.514420] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 53.519010] ? retint_kernel+0x2d/0x2d [ 53.522890] ? trace_hardirqs_on_caller+0xc0/0x310 [ 53.527824] ? __save_stack_trace+0x8d/0xf0 [ 53.532143] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.536898] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.542437] locks_remove_file+0x148/0x5c0 [ 53.546819] ? fcntl_setlk+0xfc0/0xfc0 [ 53.550708] ? fsnotify_first_mark+0x350/0x350 [ 53.555293] ? __fsnotify_parent+0xcc/0x420 [ 53.559606] ? fsnotify+0xf20/0xf20 [ 53.563220] ? __fput+0x268/0xa70 [ 53.566658] __fput+0x2f0/0xa70 [ 53.569926] ? get_max_files+0x20/0x20 [ 53.573796] ? trace_hardirqs_on+0xbd/0x310 [ 53.578099] ? kasan_check_read+0x11/0x20 [ 53.582296] ? task_work_run+0x1af/0x2a0 [ 53.586369] ? trace_hardirqs_off_caller+0x300/0x300 [ 53.591476] ____fput+0x15/0x20 [ 53.594747] task_work_run+0x1e8/0x2a0 [ 53.598623] ? task_work_cancel+0x240/0x240 [ 53.602939] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 53.608463] ? switch_task_namespaces+0x9d/0xd0 [ 53.613116] do_exit+0x1ad1/0x26d0 [ 53.616636] ? lock_downgrade+0x900/0x900 [ 53.620921] ? check_preemption_disabled+0x48/0x280 [ 53.625943] ? rcu_read_unlock_special+0x181/0x1c0 [ 53.630881] ? mm_update_next_owner+0x990/0x990 [ 53.635540] ? rcu_softirq_qs+0x20/0x20 [ 53.639499] ? rcu_softirq_qs+0x20/0x20 [ 53.643456] ? unwind_dump+0x190/0x190 [ 53.647337] ? is_bpf_text_address+0xd3/0x170 [ 53.651822] ? kernel_text_address+0x79/0xf0 [ 53.656213] ? __kernel_text_address+0xd/0x40 [ 53.660690] ? unwind_get_return_address+0x61/0xa0 [ 53.665604] ? __save_stack_trace+0x8d/0xf0 [ 53.669914] ? save_stack+0xa9/0xd0 [ 53.673520] ? save_stack+0x43/0xd0 [ 53.677127] ? __kasan_slab_free+0x102/0x150 [ 53.681513] ? kasan_slab_free+0xe/0x10 [ 53.685466] ? kmem_cache_free+0x83/0x290 [ 53.689594] ? locks_free_lock+0x295/0x420 [ 53.693810] ? __x64_sys_flock+0x289/0x350 [ 53.698028] ? do_syscall_64+0x1b9/0x820 [ 53.702163] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.706926] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 53.711511] ? retint_kernel+0x2d/0x2d [ 53.715393] ? trace_hardirqs_on_caller+0xc0/0x310 [ 53.720312] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 53.725765] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.731301] ? check_preemption_disabled+0x48/0x280 [ 53.736322] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 53.741856] ? rcu_pm_notify+0xc0/0xc0 [ 53.745734] ? locks_free_lock+0x295/0x420 [ 53.749967] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.754825] ? lockdep_hardirqs_on+0x3bb/0x5b0 [ 53.759493] ? retint_kernel+0x2d/0x2d [ 53.763380] ? trace_hardirqs_on_caller+0xc0/0x310 [ 53.768301] ? locks_free_lock+0x295/0x420 [ 53.772528] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 53.777271] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 53.782707] ? locks_mandatory_area+0x6a0/0x6a0 [ 53.787370] do_group_exit+0x177/0x440 [ 53.791252] ? __ia32_sys_exit+0x50/0x50 [ 53.795300] __x64_sys_exit_group+0x3e/0x50 [ 53.799604] do_syscall_64+0x1b9/0x820 [ 53.803474] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 53.808825] ? syscall_return_slowpath+0x5e0/0x5e0 [ 53.813736] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.818562] ? trace_hardirqs_on_caller+0x310/0x310 [ 53.823558] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 53.828557] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 53.834077] ? prepare_exit_to_usermode+0x291/0x3b0 [ 53.839075] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 53.843904] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.849074] RIP: 0033:0x43ede8 [ 53.852263] Code: Bad RIP value. [ 53.855620] RSP: 002b:00007ffd8fd5fb08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 53.863327] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ede8 [ 53.870585] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 53.877842] RBP: 00000000004beea8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 53.885096] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 53.892401] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 53.899679] Modules linked in: [ 53.904306] ---[ end trace c3a7af4bd87175e0 ]--- [ 53.909191] RIP: 0010:locks_remove_flock+0x216/0x350 [ 53.914673] Code: 00 0f 85 3a 01 00 00 48 8b 5b 98 48 85 db 74 3a e8 1f 41 92 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 17 01 00 00 48 8b 5b 08 48 85 db 74 0d e8 f2 40 [ 53.933867] RSP: 0018:ffff8801bc5972c0 EFLAGS: 00010206 [ 53.939368] RAX: dffffc0000000000 RBX: 1ffff100378b2e89 RCX: ffffffff81ed555d [ 53.946740] RDX: 03fffe2006f165d2 RSI: ffffffff81ed5c71 RDI: 1ffff100378b2e91 [ 53.954260] RBP: ffff8801bc5974a0 R08: ffff8801d74dc200 R09: ffffed003b5c5b67 [ 53.961642] R10: ffffed003b5c5b67 R11: ffff8801dae2db3b R12: ffff8801d74c2000 [ 53.969171] R13: ffff8801bc597338 R14: 1ffff100378b2e5b R15: dffffc0000000000 [ 53.976583] FS: 0000000000e8d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 53.984948] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 53.990891] CR2: 000000000043edbe CR3: 000000000946a000 CR4: 00000000001406f0 [ 53.998947] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 54.006324] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 54.013696] Kernel panic - not syncing: Fatal exception [ 54.020269] Kernel Offset: disabled [ 54.023902] Rebooting in 86400 seconds..