[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.184685] audit: type=1800 audit(1538101798.160:25): pid=5899 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.209622] audit: type=1800 audit(1538101798.160:26): pid=5899 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.229464] audit: type=1800 audit(1538101798.170:27): pid=5899 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] 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 '10.128.0.2' (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 syzkaller login: [ 47.956336] kasan: CONFIG_KASAN_INLINE enabled [ 47.961045] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 47.968509] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.974835] CPU: 1 PID: 6221 Comm: syz-executor880 Not tainted 4.19.0-rc5-next-20180927+ #82 [ 47.983389] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.992736] RIP: 0010:memcmp+0x28/0x160 [ 47.996713] Code: 00 00 48 85 d2 0f 84 0a 01 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 f9 48 89 e5 48 c1 e9 03 41 54 53 48 89 fb 48 83 ec 18 <0f> b6 04 01 48 89 f9 83 e1 07 38 c8 7f 08 84 c0 0f 85 98 00 00 00 [ 48.015642] RSP: 0018:ffff8801d3a36f98 EFLAGS: 00010292 [ 48.020995] RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: 000000000836b156 [ 48.028247] RDX: 0000000000000002 RSI: ffffffff885fbf20 RDI: 0000000041b58ab3 [ 48.035627] RBP: ffff8801d3a36fc0 R08: ffff8801d53fe700 R09: 0000000000000000 [ 48.042932] R10: ffffed003a746e5a R11: 0000000000000000 R12: 0000000000000002 [ 48.050195] R13: ffffffff885fbf20 R14: ffff88021558fe03 R15: dffffc0000000000 [ 48.057462] FS: 00000000010c4880(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 [ 48.065674] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.071538] CR2: 00000000006cb090 CR3: 00000001d35d4000 CR4: 00000000001406e0 [ 48.078796] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.086059] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.093306] Call Trace: [ 48.095882] strnstr+0x4b/0x70 [ 48.099061] __aa_lookupn_ns+0xc1/0x570 [ 48.103020] ? free_one_page+0xcae/0x1700 [ 48.107153] ? aa_find_ns+0x30/0x30 [ 48.110767] ? lock_acquire+0x1ed/0x520 [ 48.114731] ? __aa_lookupn_ns+0x570/0x570 [ 48.118950] ? kasan_check_read+0x11/0x20 [ 48.123083] ? lock_release+0x970/0x970 [ 48.127039] ? mark_held_locks+0x130/0x130 [ 48.131267] ? __this_cpu_preempt_check+0x1c/0x1f [ 48.136094] ? mark_held_locks+0x130/0x130 [ 48.140316] ? _raw_spin_unlock+0x2c/0x50 [ 48.144450] aa_lookupn_ns+0x88/0x1e0 [ 48.148233] aa_fqlookupn_profile+0x1b9/0x1010 [ 48.152798] ? drain_local_pages_wq+0x40/0x40 [ 48.157384] ? aa_lookup_profile+0x30/0x30 [ 48.161612] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.166008] ? trace_hardirqs_on_caller+0x310/0x310 [ 48.171012] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.176540] ? refcount_inc_not_zero_checked+0x1e5/0x2f0 [ 48.181975] ? refcount_add_not_zero_checked+0x330/0x330 [ 48.187409] ? mark_held_locks+0x130/0x130 [ 48.191628] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.197156] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.202679] fqlookupn_profile+0x80/0xc0 [ 48.206722] aa_label_strn_parse+0xa3a/0x1230 [ 48.211201] ? aa_label_printk+0x850/0x850 [ 48.215419] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 48.220333] ? kasan_check_read+0x11/0x20 [ 48.224462] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 48.229722] ? rcu_softirq_qs+0x20/0x20 [ 48.233678] ? unwind_dump+0x190/0x190 [ 48.237549] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.243191] ? refcount_inc_not_zero_checked+0x1e5/0x2f0 [ 48.248639] ? refcount_add_not_zero_checked+0x330/0x330 [ 48.254074] ? unwind_get_return_address+0x61/0xa0 [ 48.258989] ? __save_stack_trace+0x8d/0xf0 [ 48.263295] aa_label_parse+0x42/0x50 [ 48.267086] aa_change_profile+0x513/0x3510 [ 48.271397] ? save_stack+0x43/0xd0 [ 48.275009] ? kasan_kmalloc+0xc7/0xe0 [ 48.278885] ? apparmor_setprocattr+0x2ab/0x1180 [ 48.283637] ? __vfs_write+0x119/0x9f0 [ 48.287507] ? __x64_sys_write+0x11/0xb0 [ 48.291549] ? do_syscall_64+0x1b9/0x820 [ 48.295602] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.301002] ? aa_change_hat+0x1a20/0x1a20 [ 48.305316] ? is_bpf_text_address+0xd3/0x170 [ 48.309821] ? lock_downgrade+0x900/0x900 [ 48.313964] ? trace_hardirqs_on+0xbd/0x310 [ 48.318273] ? apparmor_setprocattr+0x2ab/0x1180 [ 48.323021] ? kasan_unpoison_shadow+0x35/0x50 [ 48.327594] ? kasan_kmalloc+0xc7/0xe0 [ 48.331469] ? __kmalloc+0x31c/0x760 [ 48.335166] ? kmem_freepages.isra.35+0x426/0x640 [ 48.339993] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.344561] apparmor_setprocattr+0xa9e/0x1180 [ 48.349137] ? quarantine_reduce+0x163/0x1a0 [ 48.353531] ? apparmor_task_kill+0xcb0/0xcb0 [ 48.358012] ? lock_downgrade+0x900/0x900 [ 48.362144] ? ttwu_stat+0x5c0/0x5c0 [ 48.365851] security_setprocattr+0x66/0xc0 [ 48.370167] proc_pid_attr_write+0x301/0x540 [ 48.374558] __vfs_write+0x119/0x9f0 [ 48.378267] ? proc_loginuid_write+0x4f0/0x4f0 [ 48.382841] ? kernel_read+0x120/0x120 [ 48.386720] ? lock_release+0x970/0x970 [ 48.390691] ? ttwu_stat+0x5c0/0x5c0 [ 48.394389] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 48.399304] ? trace_find_mark+0x10/0xe0 [ 48.403350] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.408966] ? check_preemption_disabled+0x48/0x200 [ 48.413969] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.419490] ? __sb_start_write+0x1b2/0x370 [ 48.423794] vfs_write+0x1fc/0x560 [ 48.427318] ksys_write+0x101/0x260 [ 48.430927] ? __ia32_sys_read+0xb0/0xb0 [ 48.434972] ? trace_hardirqs_off_caller+0x300/0x300 [ 48.440058] __x64_sys_write+0x73/0xb0 [ 48.443941] do_syscall_64+0x1b9/0x820 [ 48.447831] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 48.453188] ? syscall_return_slowpath+0x5e0/0x5e0 [ 48.458102] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.462978] ? trace_hardirqs_off+0x310/0x310 [ 48.467564] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 48.472590] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.478126] ? prepare_exit_to_usermode+0x291/0x3b0 [ 48.483134] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.487960] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.493132] RIP: 0033:0x440d49 [ 48.496310] Code: e8 cc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 48.515200] RSP: 002b:00007ffebfefacd8 EFLAGS: 00000213 ORIG_RAX: 0000000000000001 [ 48.522896] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440d49 [ 48.530148] RDX: 000000000000002c RSI: 0000000020000000 RDI: 0000000000000003 [ 48.537401] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 48.544652] R10: 00000000010c4880 R11: 0000000000000213 R12: 000000000000bb44 [ 48.551908] R13: 0000000000401d20 R14: 0000000000000000 R15: 0000000000000000 [ 48.559175] Modules linked in: [ 48.562691] ---[ end trace 27f1c7707f42c623 ]--- [ 48.567460] RIP: 0010:memcmp+0x28/0x160 [ 48.571461] Code: 00 00 48 85 d2 0f 84 0a 01 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 f9 48 89 e5 48 c1 e9 03 41 54 53 48 89 fb 48 83 ec 18 <0f> b6 04 01 48 89 f9 83 e1 07 38 c8 7f 08 84 c0 0f 85 98 00 00 00 [ 48.590503] RSP: 0018:ffff8801d3a36f98 EFLAGS: 00010292 [ 48.595851] RAX: dffffc0000000000 RBX: 0000000041b58ab3 RCX: 000000000836b156 [ 48.603153] RDX: 0000000000000002 RSI: ffffffff885fbf20 RDI: 0000000041b58ab3 [ 48.610457] RBP: ffff8801d3a36fc0 R08: ffff8801d53fe700 R09: 0000000000000000 [ 48.617719] R10: ffffed003a746e5a R11: 0000000000000000 R12: 0000000000000002 [ 48.625009] R13: ffffffff885fbf20 R14: ffff88021558fe03 R15: dffffc0000000000 [ 48.632295] FS: 00000000010c4880(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 [ 48.640549] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.646438] CR2: 00000000006cb090 CR3: 00000001d35d4000 CR4: 00000000001406e0 [ 48.653731] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.661024] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.668357] Kernel panic - not syncing: Fatal exception [ 48.674675] Kernel Offset: disabled [ 48.678338] Rebooting in 86400 seconds..