[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.610881] audit: type=1800 audit(1539239522.415:25): pid=5666 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 34.649415] audit: type=1800 audit(1539239522.415:26): pid=5666 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 34.679452] audit: type=1800 audit(1539239522.415:27): pid=5666 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 '10.128.0.107' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 46.947689] kasan: CONFIG_KASAN_INLINE enabled [ 46.952424] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 46.959824] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 46.966055] CPU: 0 PID: 5819 Comm: syz-executor039 Not tainted 4.19.0-rc6+ #136 [ 46.973935] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.983283] RIP: 0010:rb_erase+0x306/0x3710 [ 46.988288] 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 [ 47.007175] RSP: 0018:ffff8801d7096918 EFLAGS: 00010202 [ 47.012763] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 47.023112] RDX: 1ffff1003ae12d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 47.033733] RBP: ffff8801d7097320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 47.041050] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8ea11f0 [ 47.048313] R13: dffffc0000000000 R14: ffff8801d70972f8 R15: ffff8801d7097438 [ 47.056873] FS: 000000000079d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 47.067899] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.074027] CR2: 0000000020000080 CR3: 00000001d7c10000 CR4: 00000000001406f0 [ 47.081975] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.089226] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.096473] Call Trace: [ 47.099050] ? rb_insert_color+0x1460/0x1460 [ 47.103445] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 47.108356] ? lock_downgrade+0x900/0x900 [ 47.112490] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 47.118273] ? mark_held_locks+0x130/0x130 [ 47.123318] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 47.129276] ? rcu_bh_qs+0xc0/0xc0 [ 47.132800] ? unwind_dump+0x190/0x190 [ 47.136675] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.142197] ? mark_held_locks+0x130/0x130 [ 47.146420] ? mark_page_accessed+0xcb0/0x2040 [ 47.150984] ? activate_page+0x1040/0x1040 [ 47.155202] ? activate_page+0x1040/0x1040 [ 47.159477] ? mark_held_locks+0x130/0x130 [ 47.163705] ? kasan_kmalloc+0xc7/0xe0 [ 47.167578] ? kmem_cache_alloc_trace+0x152/0x750 [ 47.172841] ? ima_add_digest_entry+0xcb/0x6a0 [ 47.177413] ? ima_add_template_entry+0x466/0x7f0 [ 47.182237] ? ima_store_template+0x224/0x310 [ 47.186718] ? pagecache_get_page+0x2d8/0xf00 [ 47.191199] ? find_get_pages_contig+0x15b0/0x15b0 [ 47.196114] ? is_bpf_text_address+0xac/0x170 [ 47.200592] ? lock_downgrade+0x900/0x900 [ 47.204729] ? mark_held_locks+0x130/0x130 [ 47.208956] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 47.214742] ? mark_held_locks+0x130/0x130 [ 47.218965] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 47.224318] ? lock_downgrade+0x900/0x900 [ 47.228453] ? kasan_check_read+0x11/0x20 [ 47.232590] ? do_raw_spin_unlock+0xa7/0x2f0 [ 47.236986] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 47.241557] ? mark_held_locks+0x130/0x130 [ 47.245777] ? _raw_spin_unlock+0x2c/0x50 [ 47.249912] ? ext4_discard_preallocations+0x18a/0x13c0 [ 47.255264] ? trace_hardirqs_on+0xbd/0x310 [ 47.259579] ? ext4_exit_mballoc+0xc0/0xc0 [ 47.263808] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 47.268815] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 47.273665] ? modules_open+0xa0/0xa0 [ 47.277460] ? __es_tree_search.isra.12+0x1ba/0x220 [ 47.282765] ? __es_remove_extent+0x9a3/0xba0 [ 47.287860] ? mark_held_locks+0x130/0x130 [ 47.293325] ? lock_downgrade+0x900/0x900 [ 47.299218] ? ext4_es_scan+0x960/0x960 [ 47.305040] ? lock_release+0x970/0x970 [ 47.310774] ? trace_hardirqs_on+0xbd/0x310 [ 47.316943] ? kasan_check_read+0x11/0x20 [ 47.322941] ? clear_inode+0x114/0x3a0 [ 47.328359] ? do_raw_write_trylock+0x1c0/0x1c0 [ 47.335122] ? kasan_check_write+0x14/0x20 [ 47.341219] ? lock_acquire+0x1ed/0x520 [ 47.347032] ? integrity_inode_free+0x77/0x320 [ 47.353751] ? ext4_es_remove_extent+0x151/0x500 [ 47.360284] ? lock_release+0x970/0x970 [ 47.366127] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 47.373372] ? depot_save_stack+0x292/0x470 [ 47.379767] ? kasan_check_write+0x14/0x20 [ 47.385777] ? do_raw_write_lock+0xbd/0x1b0 [ 47.391946] integrity_inode_free+0x12f/0x320 [ 47.398296] security_inode_free+0x19/0x90 [ 47.403174] __destroy_inode+0x328/0x820 [ 47.407224] ? generic_update_time+0x450/0x450 [ 47.411790] ? evict+0x5d8/0x980 [ 47.415140] ? lock_downgrade+0x900/0x900 [ 47.419276] ? __inode_wait_for_writeback+0x2cf/0x380 [ 47.424654] destroy_inode+0xda/0x200 [ 47.428447] ? __destroy_inode+0x820/0x820 [ 47.432668] ? kasan_check_write+0x14/0x20 [ 47.436887] ? do_raw_spin_lock+0xc1/0x200 [ 47.441109] evict+0x5e0/0x980 [ 47.444287] ? jbd2_journal_stop+0x430/0x15d0 [ 47.448775] ? destroy_inode+0x200/0x200 [ 47.452822] ? do_raw_spin_lock+0xc1/0x200 [ 47.457217] ? iput+0x671/0xa90 [ 47.460480] ? lock_downgrade+0x900/0x900 [ 47.464613] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 47.470159] ? kasan_check_read+0x11/0x20 [ 47.474295] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 47.478863] ? lock_downgrade+0x900/0x900 [ 47.482997] ? ext4_ioctl+0x231b/0x4210 [ 47.486958] iput+0x679/0xa90 [ 47.490165] ? inode_add_lru+0x2a0/0x2a0 [ 47.494249] ? up_write+0x7b/0x220 [ 47.497772] ? up_read+0x110/0x110 [ 47.501297] ? up_read+0x110/0x110 [ 47.504864] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.510395] ? check_preemption_disabled+0x48/0x200 [ 47.515488] ext4_ioctl+0x236f/0x4210 [ 47.519311] ? is_bpf_text_address+0xac/0x170 [ 47.523793] ? ext4_ioctl_group_add+0x560/0x560 [ 47.528452] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 47.534236] ? kasan_check_read+0x11/0x20 [ 47.538371] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 47.543634] ? rcu_bh_qs+0xc0/0xc0 [ 47.548112] ? unwind_dump+0x190/0x190 [ 47.552429] ? is_bpf_text_address+0xd3/0x170 [ 47.556914] ? kernel_text_address+0x79/0xf0 [ 47.561368] ? __kernel_text_address+0xd/0x40 [ 47.565861] ? unwind_get_return_address+0x61/0xa0 [ 47.570789] ? __save_stack_trace+0x8d/0xf0 [ 47.575164] ? save_stack+0xa9/0xd0 [ 47.578781] ? save_stack+0x43/0xd0 [ 47.582453] ? __kasan_slab_free+0x102/0x150 [ 47.586855] ? kasan_slab_free+0xe/0x10 [ 47.590818] ? kmem_cache_free+0x83/0x290 [ 47.594951] ? putname+0xf2/0x130 [ 47.598390] ? do_sys_open+0x54d/0x700 [ 47.602268] ? __x64_sys_openat+0x9d/0x100 [ 47.606500] ? do_syscall_64+0x1b9/0x820 [ 47.610633] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.615996] ? trace_hardirqs_off+0xb8/0x310 [ 47.620391] ? kasan_check_read+0x11/0x20 [ 47.624531] ? do_raw_spin_unlock+0xa7/0x2f0 [ 47.628977] ? trace_hardirqs_on+0x310/0x310 [ 47.633377] ? kasan_check_write+0x14/0x20 [ 47.637695] ? trace_hardirqs_off+0xb8/0x310 [ 47.642088] ? trace_hardirqs_on+0x310/0x310 [ 47.647148] ? ext4_ioctl_group_add+0x560/0x560 [ 47.652277] do_vfs_ioctl+0x1de/0x1720 [ 47.656160] ? trace_hardirqs_on+0xbd/0x310 [ 47.660470] ? ioctl_preallocate+0x300/0x300 [ 47.664862] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.670386] ? __fget_light+0x2e9/0x430 [ 47.674349] ? fget_raw+0x20/0x20 [ 47.677783] ? putname+0xf2/0x130 [ 47.681219] ? kmem_cache_free+0x21a/0x290 [ 47.685555] ? putname+0xf7/0x130 [ 47.689016] ? security_file_ioctl+0x94/0xc0 [ 47.693425] ksys_ioctl+0xa9/0xd0 [ 47.696877] __x64_sys_ioctl+0x73/0xb0 [ 47.700757] do_syscall_64+0x1b9/0x820 [ 47.704636] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 47.709995] ? syscall_return_slowpath+0x5e0/0x5e0 [ 47.714917] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.719753] ? trace_hardirqs_on_caller+0x310/0x310 [ 47.724766] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 47.729776] ? prepare_exit_to_usermode+0x291/0x3b0 [ 47.734840] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.739684] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.744904] RIP: 0033:0x440009 [ 47.748094] 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 [ 47.767125] RSP: 002b:00007ffce1e749c8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 47.774829] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 47.782084] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 47.789343] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 47.796597] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 47.803848] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 47.811101] Modules linked in: [ 47.814421] ---[ end trace fd20081f2e32bccf ]--- [ 47.819212] RIP: 0010:rb_erase+0x306/0x3710 [ 47.823523] 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 [ 47.842743] RSP: 0018:ffff8801d7096918 EFLAGS: 00010202 [ 47.848254] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 47.855573] RDX: 1ffff1003ae12d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 47.862842] RBP: ffff8801d7097320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 47.870127] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b8ea11f0 [ 47.877418] R13: dffffc0000000000 R14: ffff8801d70972f8 R15: ffff8801d7097438 [ 47.884675] FS: 000000000079d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 47.892917] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.898810] CR2: 0000000020000080 CR3: 00000001d7c10000 CR4: 00000000001406f0 [ 47.906108] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.913463] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.920755] Kernel panic - not syncing: Fatal exception [ 47.927294] Kernel Offset: disabled [ 47.930915] Rebooting in 86400 seconds..