[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 31.056389] audit: type=1800 audit(1539238575.914:25): pid=5635 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 31.081381] audit: type=1800 audit(1539238575.924:26): pid=5635 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 31.110234] audit: type=1800 audit(1539238575.924:27): pid=5635 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 '10.128.0.20' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 41.998721] kasan: CONFIG_KASAN_INLINE enabled [ 42.003309] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.010703] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.016944] CPU: 1 PID: 5790 Comm: syz-executor895 Not tainted 4.19.0-rc6+ #254 [ 42.024399] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.033755] RIP: 0010:rb_erase+0x306/0x3710 [ 42.038058] Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9 65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00 0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00 [ 42.056961] RSP: 0018:ffff8801bbede918 EFLAGS: 00010202 [ 42.062321] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 42.069573] RDX: 1ffff100377dbd2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 42.076840] RBP: ffff8801bbedf320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 42.084098] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801b8f561f0 [ 42.091384] R13: dffffc0000000000 R14: ffff8801bbedf2f8 R15: ffff8801bbedf438 [ 42.098638] FS: 00000000019ba880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 42.106842] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.112699] CR2: 0000000020000080 CR3: 00000001bbe12000 CR4: 00000000001406e0 [ 42.119953] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.127204] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.134451] Call Trace: [ 42.137032] ? rb_insert_color+0x1460/0x1460 [ 42.141428] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 42.146338] ? do_raw_spin_lock+0xc1/0x200 [ 42.150557] ? mark_held_locks+0x130/0x130 [ 42.154777] ? trace_hardirqs_off+0xb8/0x310 [ 42.159169] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.164688] ? mark_held_locks+0x130/0x130 [ 42.168902] ? mark_page_accessed+0xcb0/0x2040 [ 42.173467] ? activate_page+0x1040/0x1040 [ 42.177681] ? activate_page+0x1040/0x1040 [ 42.182162] ? trace_hardirqs_off+0xb8/0x310 [ 42.186555] ? do_raw_spin_unlock+0xa7/0x2f0 [ 42.190945] ? trace_hardirqs_on+0x310/0x310 [ 42.195337] ? kasan_check_write+0x14/0x20 [ 42.199561] ? pagecache_get_page+0x2d8/0xf00 [ 42.204040] ? find_get_pages_contig+0x15b0/0x15b0 [ 42.208956] ? is_bpf_text_address+0xac/0x170 [ 42.213433] ? lock_downgrade+0x900/0x900 [ 42.217560] ? mark_held_locks+0x130/0x130 [ 42.222349] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.228137] ? mark_held_locks+0x130/0x130 [ 42.232357] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 42.237701] ? lock_downgrade+0x900/0x900 [ 42.241831] ? kasan_check_read+0x11/0x20 [ 42.245964] ? do_raw_spin_unlock+0xa7/0x2f0 [ 42.250361] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 42.254927] ? mark_held_locks+0x130/0x130 [ 42.259148] ? _raw_spin_unlock+0x2c/0x50 [ 42.263293] ? ext4_discard_preallocations+0x18a/0x13c0 [ 42.268641] ? trace_hardirqs_on+0xbd/0x310 [ 42.272945] ? ext4_exit_mballoc+0xc0/0xc0 [ 42.277164] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 42.282179] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 42.286937] ? modules_open+0xa0/0xa0 [ 42.290723] ? __es_tree_search.isra.12+0x1ba/0x220 [ 42.295723] ? __es_remove_extent+0x9a3/0xba0 [ 42.300201] ? mark_held_locks+0x130/0x130 [ 42.304415] ? lock_downgrade+0x900/0x900 [ 42.308558] ? ext4_es_scan+0x960/0x960 [ 42.312512] ? lock_release+0x970/0x970 [ 42.316483] ? trace_hardirqs_on+0xbd/0x310 [ 42.320788] ? kasan_check_read+0x11/0x20 [ 42.325264] ? clear_inode+0x114/0x3a0 [ 42.329136] ? do_raw_write_trylock+0x1c0/0x1c0 [ 42.333785] ? kasan_check_write+0x14/0x20 [ 42.338003] ? lock_acquire+0x1ed/0x520 [ 42.342062] ? integrity_inode_free+0x77/0x320 [ 42.346626] ? ext4_es_remove_extent+0x151/0x500 [ 42.351362] ? lock_release+0x970/0x970 [ 42.355317] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 42.360399] ? depot_save_stack+0x292/0x470 [ 42.365095] ? kasan_check_write+0x14/0x20 [ 42.369315] ? do_raw_write_lock+0xbd/0x1b0 [ 42.373895] integrity_inode_free+0x12f/0x320 [ 42.378383] security_inode_free+0x19/0x90 [ 42.382603] __destroy_inode+0x328/0x820 [ 42.386876] ? generic_update_time+0x450/0x450 [ 42.391441] ? evict+0x5d8/0x980 [ 42.394798] ? lock_downgrade+0x900/0x900 [ 42.398930] ? __inode_wait_for_writeback+0x2cf/0x380 [ 42.404107] destroy_inode+0xda/0x200 [ 42.407899] ? __destroy_inode+0x820/0x820 [ 42.412124] ? kasan_check_write+0x14/0x20 [ 42.416822] ? do_raw_spin_lock+0xc1/0x200 [ 42.421965] evict+0x5e0/0x980 [ 42.425147] ? jbd2_journal_stop+0x430/0x15d0 [ 42.429623] ? destroy_inode+0x200/0x200 [ 42.433675] ? do_raw_spin_lock+0xc1/0x200 [ 42.438256] ? iput+0x671/0xa90 [ 42.441590] ? lock_downgrade+0x900/0x900 [ 42.445826] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 42.451369] ? kasan_check_read+0x11/0x20 [ 42.455513] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 42.460088] ? lock_downgrade+0x900/0x900 [ 42.464236] ? ext4_ioctl+0x231b/0x4210 [ 42.468197] iput+0x679/0xa90 [ 42.471637] ? inode_add_lru+0x2a0/0x2a0 [ 42.475812] ? up_write+0x7b/0x220 [ 42.479337] ? up_read+0x110/0x110 [ 42.482859] ? up_read+0x110/0x110 [ 42.486514] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.492048] ? check_preemption_disabled+0x48/0x200 [ 42.497065] ext4_ioctl+0x236f/0x4210 [ 42.500929] ? is_bpf_text_address+0xac/0x170 [ 42.505425] ? ext4_ioctl_group_add+0x560/0x560 [ 42.510087] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.515877] ? kasan_check_read+0x11/0x20 [ 42.520024] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 42.525290] ? rcu_bh_qs+0xc0/0xc0 [ 42.528818] ? unwind_dump+0x190/0x190 [ 42.532697] ? is_bpf_text_address+0xd3/0x170 [ 42.537179] ? kernel_text_address+0x79/0xf0 [ 42.541575] ? __kernel_text_address+0xd/0x40 [ 42.546062] ? unwind_get_return_address+0x61/0xa0 [ 42.551045] ? __save_stack_trace+0x8d/0xf0 [ 42.555361] ? save_stack+0xa9/0xd0 [ 42.558970] ? save_stack+0x43/0xd0 [ 42.562584] ? __kasan_slab_free+0x102/0x150 [ 42.567051] ? kasan_slab_free+0xe/0x10 [ 42.571416] ? kmem_cache_free+0x83/0x290 [ 42.575601] ? putname+0xf2/0x130 [ 42.579042] ? do_sys_open+0x54d/0x700 [ 42.582919] ? __x64_sys_openat+0x9d/0x100 [ 42.587140] ? do_syscall_64+0x1b9/0x820 [ 42.591191] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.596735] ? trace_hardirqs_off+0xb8/0x310 [ 42.601130] ? kasan_check_read+0x11/0x20 [ 42.605267] ? do_raw_spin_unlock+0xa7/0x2f0 [ 42.609660] ? trace_hardirqs_on+0x310/0x310 [ 42.614057] ? kasan_check_write+0x14/0x20 [ 42.618281] ? trace_hardirqs_off+0xb8/0x310 [ 42.622690] ? trace_hardirqs_on+0x310/0x310 [ 42.627082] ? ext4_ioctl_group_add+0x560/0x560 [ 42.631779] do_vfs_ioctl+0x1de/0x1720 [ 42.635664] ? trace_hardirqs_on+0xbd/0x310 [ 42.639972] ? ioctl_preallocate+0x300/0x300 [ 42.644424] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 42.652351] ? __fget_light+0x2e9/0x430 [ 42.657784] ? fget_raw+0x20/0x20 [ 42.662703] ? putname+0xf2/0x130 [ 42.666829] ? kmem_cache_free+0x21a/0x290 [ 42.671050] ? putname+0xf7/0x130 [ 42.674501] ? security_file_ioctl+0x94/0xc0 [ 42.678893] ksys_ioctl+0xa9/0xd0 [ 42.682338] __x64_sys_ioctl+0x73/0xb0 [ 42.686217] do_syscall_64+0x1b9/0x820 [ 42.690092] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 42.695450] ? syscall_return_slowpath+0x5e0/0x5e0 [ 42.700370] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.705206] ? trace_hardirqs_on_caller+0x310/0x310 [ 42.710210] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 42.715210] ? prepare_exit_to_usermode+0x291/0x3b0 [ 42.720610] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.725978] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 42.731153] RIP: 0033:0x440009 [ 42.734338] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 42.753259] RSP: 002b:00007ffca8ba2698 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 42.761960] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 42.769226] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 42.776486] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 42.783742] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 42.790990] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 42.798254] Modules linked in: [ 42.801627] ---[ end trace 1a2338adda6608d7 ]--- [ 42.806390] RIP: 0010:rb_erase+0x306/0x3710 [ 42.810826] Code: c7 81 28 01 00 00 f2 f2 f2 f2 c7 81 2c 01 00 00 00 f2 f2 f2 48 89 f9 65 48 8b 1c 25 28 00 00 00 48 89 5d d0 31 db 48 c1 e9 03 <42> 80 3c 01 00 0f 85 41 1c 00 00 4c 8d 48 10 4c 8b 78 08 48 b9 00 [ 42.831804] RSP: 0018:ffff8801bbede918 EFLAGS: 00010202 [ 42.837868] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 42.845140] RDX: 1ffff100377dbd2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 42.852452] RBP: ffff8801bbedf320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 42.859745] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801b8f561f0 [ 42.868262] R13: dffffc0000000000 R14: ffff8801bbedf2f8 R15: ffff8801bbedf438 [ 42.875533] FS: 00000000019ba880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 42.883781] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.889686] CR2: 0000000020000080 CR3: 00000001bbe12000 CR4: 00000000001406e0 [ 42.896995] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.904280] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.911586] Kernel panic - not syncing: Fatal exception [ 42.918140] Kernel Offset: disabled [ 42.921762] Rebooting in 86400 seconds..