[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.385316] audit: type=1800 audit(1539139239.915:25): pid=5671 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.405162] audit: type=1800 audit(1539139239.915:26): pid=5671 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.435549] audit: type=1800 audit(1539139239.915:27): pid=5671 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.10.18' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 47.666488] kasan: CONFIG_KASAN_INLINE enabled [ 47.671087] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 47.678486] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.684720] CPU: 1 PID: 5826 Comm: syz-executor569 Not tainted 4.19.0-rc7+ #52 [ 47.692062] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.701407] RIP: 0010:rb_erase+0x306/0x3710 [ 47.705716] 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 [ 47.724602] RSP: 0018:ffff8801c7a3e918 EFLAGS: 00010202 [ 47.729956] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 47.737230] RDX: 1ffff10038f47d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 47.744487] RBP: ffff8801c7a3f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 47.751742] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801c3c0b270 [ 47.758994] R13: dffffc0000000000 R14: ffff8801c7a3f2f8 R15: ffff8801c7a3f438 [ 47.766248] FS: 000000000178c880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 47.774480] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.780342] CR2: 0000000020000080 CR3: 00000001d3245000 CR4: 00000000001406e0 [ 47.787595] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.794865] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.802115] Call Trace: [ 47.804691] ? rb_insert_color+0x1460/0x1460 [ 47.809089] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 47.814004] ? lock_downgrade+0x900/0x900 [ 47.818144] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 47.823941] ? mark_held_locks+0x130/0x130 [ 47.828178] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 47.833457] ? rcu_bh_qs+0xc0/0xc0 [ 47.836983] ? unwind_dump+0x190/0x190 [ 47.840871] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.846394] ? mark_held_locks+0x130/0x130 [ 47.850612] ? mark_page_accessed+0xcb0/0x2040 [ 47.855195] ? activate_page+0x1040/0x1040 [ 47.859425] ? activate_page+0x1040/0x1040 [ 47.863647] ? mark_held_locks+0x130/0x130 [ 47.867864] ? kasan_kmalloc+0xc7/0xe0 [ 47.871733] ? kmem_cache_alloc_trace+0x152/0x750 [ 47.876556] ? ima_add_digest_entry+0xcb/0x6a0 [ 47.881119] ? ima_add_template_entry+0x466/0x7f0 [ 47.885944] ? ima_store_template+0x224/0x310 [ 47.890423] ? pagecache_get_page+0x2d8/0xf00 [ 47.894902] ? find_get_pages_contig+0x15b0/0x15b0 [ 47.899819] ? is_bpf_text_address+0xac/0x170 [ 47.904302] ? lock_downgrade+0x900/0x900 [ 47.908437] ? mark_held_locks+0x130/0x130 [ 47.912659] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 47.918440] ? mark_held_locks+0x130/0x130 [ 47.922660] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 47.928011] ? lock_downgrade+0x900/0x900 [ 47.932145] ? kasan_check_read+0x11/0x20 [ 47.936276] ? do_raw_spin_unlock+0xa7/0x2f0 [ 47.940671] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 47.945238] ? mark_held_locks+0x130/0x130 [ 47.949458] ? _raw_spin_unlock+0x2c/0x50 [ 47.953591] ? ext4_discard_preallocations+0x18a/0x13c0 [ 47.958941] ? trace_hardirqs_on+0xbd/0x310 [ 47.963267] ? ext4_exit_mballoc+0xc0/0xc0 [ 47.967485] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 47.972486] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 47.977226] ? modules_open+0xa0/0xa0 [ 47.981009] ? __es_tree_search.isra.12+0x1ba/0x220 [ 47.986021] ? __es_remove_extent+0x9a3/0xba0 [ 47.990503] ? mark_held_locks+0x130/0x130 [ 47.994720] ? lock_downgrade+0x900/0x900 [ 47.998847] ? ext4_es_scan+0x960/0x960 [ 48.002811] ? lock_release+0x970/0x970 [ 48.006770] ? trace_hardirqs_on+0xbd/0x310 [ 48.011080] ? kasan_check_read+0x11/0x20 [ 48.015210] ? clear_inode+0x114/0x3a0 [ 48.019082] ? do_raw_write_trylock+0x1c0/0x1c0 [ 48.023836] ? kasan_check_write+0x14/0x20 [ 48.028065] ? lock_acquire+0x1ed/0x520 [ 48.032025] ? integrity_inode_free+0x77/0x320 [ 48.036610] ? ext4_es_remove_extent+0x151/0x500 [ 48.041350] ? lock_release+0x970/0x970 [ 48.045312] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 48.050398] ? depot_save_stack+0x292/0x470 [ 48.054707] ? kasan_check_write+0x14/0x20 [ 48.058927] ? do_raw_write_lock+0xbd/0x1b0 [ 48.063232] integrity_inode_free+0x12f/0x320 [ 48.067711] security_inode_free+0x19/0x90 [ 48.071930] __destroy_inode+0x328/0x820 [ 48.075979] ? generic_update_time+0x450/0x450 [ 48.080544] ? evict+0x5d8/0x980 [ 48.083897] ? lock_downgrade+0x900/0x900 [ 48.088032] ? __inode_wait_for_writeback+0x2cf/0x380 [ 48.093209] destroy_inode+0xda/0x200 [ 48.096997] ? __destroy_inode+0x820/0x820 [ 48.101216] ? kasan_check_write+0x14/0x20 [ 48.105434] ? do_raw_spin_lock+0xc1/0x200 [ 48.109653] evict+0x5e0/0x980 [ 48.112830] ? jbd2_journal_stop+0x430/0x15d0 [ 48.117317] ? destroy_inode+0x200/0x200 [ 48.121363] ? do_raw_spin_lock+0xc1/0x200 [ 48.125582] ? iput+0x671/0xa90 [ 48.128844] ? lock_downgrade+0x900/0x900 [ 48.132979] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.138501] ? kasan_check_read+0x11/0x20 [ 48.142632] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 48.147200] ? lock_downgrade+0x900/0x900 [ 48.151344] ? ext4_ioctl+0x231b/0x4210 [ 48.155311] iput+0x679/0xa90 [ 48.158412] ? inode_add_lru+0x2a0/0x2a0 [ 48.162452] ? up_write+0x7b/0x220 [ 48.165973] ? up_read+0x110/0x110 [ 48.169491] ? up_read+0x110/0x110 [ 48.173032] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.178555] ? check_preemption_disabled+0x48/0x200 [ 48.183559] ext4_ioctl+0x236f/0x4210 [ 48.187344] ? is_bpf_text_address+0xac/0x170 [ 48.191826] ? ext4_ioctl_group_add+0x560/0x560 [ 48.196481] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 48.202261] ? kasan_check_read+0x11/0x20 [ 48.206392] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 48.211653] ? rcu_bh_qs+0xc0/0xc0 [ 48.215198] ? unwind_dump+0x190/0x190 [ 48.219075] ? is_bpf_text_address+0xd3/0x170 [ 48.223552] ? kernel_text_address+0x79/0xf0 [ 48.227942] ? __kernel_text_address+0xd/0x40 [ 48.232419] ? unwind_get_return_address+0x61/0xa0 [ 48.237335] ? __save_stack_trace+0x8d/0xf0 [ 48.241640] ? save_stack+0xa9/0xd0 [ 48.245249] ? save_stack+0x43/0xd0 [ 48.248859] ? __kasan_slab_free+0x102/0x150 [ 48.253247] ? kasan_slab_free+0xe/0x10 [ 48.257204] ? kmem_cache_free+0x83/0x290 [ 48.261331] ? putname+0xf2/0x130 [ 48.264766] ? do_sys_open+0x54d/0x700 [ 48.268646] ? __x64_sys_openat+0x9d/0x100 [ 48.272864] ? do_syscall_64+0x1b9/0x820 [ 48.276910] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.282257] ? trace_hardirqs_off+0xb8/0x310 [ 48.286646] ? kasan_check_read+0x11/0x20 [ 48.290777] ? do_raw_spin_unlock+0xa7/0x2f0 [ 48.295178] ? trace_hardirqs_on+0x310/0x310 [ 48.299571] ? kasan_check_write+0x14/0x20 [ 48.303792] ? trace_hardirqs_off+0xb8/0x310 [ 48.308187] ? trace_hardirqs_on+0x310/0x310 [ 48.312606] ? ext4_ioctl_group_add+0x560/0x560 [ 48.317259] do_vfs_ioctl+0x1de/0x1720 [ 48.321130] ? trace_hardirqs_on+0xbd/0x310 [ 48.325434] ? ioctl_preallocate+0x300/0x300 [ 48.329843] ? memset+0x31/0x40 [ 48.333107] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.338629] ? smack_file_ioctl+0x210/0x3c0 [ 48.342934] ? fget_raw+0x20/0x20 [ 48.346389] ? smack_file_lock+0x2e0/0x2e0 [ 48.350610] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.356149] ? security_file_ioctl+0x94/0xc0 [ 48.360543] ksys_ioctl+0xa9/0xd0 [ 48.363980] __x64_sys_ioctl+0x73/0xb0 [ 48.367851] do_syscall_64+0x1b9/0x820 [ 48.371722] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 48.377069] ? syscall_return_slowpath+0x5e0/0x5e0 [ 48.381979] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.386811] ? trace_hardirqs_on_caller+0x310/0x310 [ 48.391812] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 48.396813] ? prepare_exit_to_usermode+0x291/0x3b0 [ 48.401817] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.406646] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.411816] RIP: 0033:0x440089 [ 48.414993] 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 [ 48.433876] RSP: 002b:00007fff15557288 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 48.441567] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440089 [ 48.448822] RDX: 0000000000440089 RSI: 0000000000006611 RDI: 0000000000000003 [ 48.456073] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 48.463321] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401910 [ 48.470576] R13: 00000000004019a0 R14: 0000000000000000 R15: 0000000000000000 [ 48.477845] Modules linked in: [ 48.481131] ---[ end trace 4e71dab97f67af69 ]--- [ 48.485979] RIP: 0010:rb_erase+0x306/0x3710 [ 48.490305] 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 [ 48.509268] RSP: 0018:ffff8801c7a3e918 EFLAGS: 00010202 [ 48.514735] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 48.521993] RDX: 1ffff10038f47d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 48.529281] RBP: ffff8801c7a3f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 48.536571] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801c3c0b270 [ 48.543824] R13: dffffc0000000000 R14: ffff8801c7a3f2f8 R15: ffff8801c7a3f438 [ 48.551113] FS: 000000000178c880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 48.559350] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.565265] CR2: 0000000020000080 CR3: 00000001d3245000 CR4: 00000000001406e0 [ 48.572551] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.579841] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.587122] Kernel panic - not syncing: Fatal exception [ 48.593492] Kernel Offset: disabled [ 48.597117] Rebooting in 86400 seconds..