[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.825244] audit: type=1800 audit(1539051738.824:25): pid=5665 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 36.844761] audit: type=1800 audit(1539051738.824:26): pid=5665 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.877734] audit: type=1800 audit(1539051738.824:27): pid=5665 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 '10.128.10.38' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.533745] kasan: CONFIG_KASAN_INLINE enabled [ 49.538430] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 49.545865] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 49.552105] CPU: 0 PID: 5816 Comm: syz-executor921 Not tainted 4.19.0-rc6+ #134 [ 49.559587] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.568945] RIP: 0010:rb_erase+0x306/0x3710 [ 49.573254] 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 [ 49.592144] RSP: 0018:ffff8801bc61e918 EFLAGS: 00010202 [ 49.597499] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.604756] RDX: 1ffff100378c3d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 49.612010] RBP: ffff8801bc61f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 49.619262] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b924e1f0 [ 49.626515] R13: dffffc0000000000 R14: ffff8801bc61f2f8 R15: ffff8801bc61f438 [ 49.633770] FS: 0000000001b1f880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 49.641983] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.647852] CR2: 0000000020000080 CR3: 00000001d7b90000 CR4: 00000000001406f0 [ 49.655109] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.662367] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.669672] Call Trace: [ 49.672255] ? rb_insert_color+0x1460/0x1460 [ 49.676742] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 49.681717] ? lock_downgrade+0x900/0x900 [ 49.685856] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.691642] ? mark_held_locks+0x130/0x130 [ 49.695868] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 49.701196] ? rcu_bh_qs+0xc0/0xc0 [ 49.704725] ? unwind_dump+0x190/0x190 [ 49.708648] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.714176] ? mark_held_locks+0x130/0x130 [ 49.718394] ? mark_page_accessed+0xcb0/0x2040 [ 49.722954] ? activate_page+0x1040/0x1040 [ 49.727168] ? activate_page+0x1040/0x1040 [ 49.731409] ? mark_held_locks+0x130/0x130 [ 49.735637] ? kasan_kmalloc+0xc7/0xe0 [ 49.739505] ? kmem_cache_alloc_trace+0x152/0x750 [ 49.744402] ? ima_add_digest_entry+0xcb/0x6a0 [ 49.748970] ? ima_add_template_entry+0x466/0x7f0 [ 49.753796] ? ima_store_template+0x224/0x310 [ 49.758274] ? pagecache_get_page+0x2d8/0xf00 [ 49.762799] ? find_get_pages_contig+0x15b0/0x15b0 [ 49.767722] ? is_bpf_text_address+0xac/0x170 [ 49.772201] ? lock_downgrade+0x900/0x900 [ 49.776330] ? mark_held_locks+0x130/0x130 [ 49.780546] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 49.786326] ? mark_held_locks+0x130/0x130 [ 49.790545] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 49.795964] ? lock_downgrade+0x900/0x900 [ 49.800103] ? kasan_check_read+0x11/0x20 [ 49.804235] ? do_raw_spin_unlock+0xa7/0x2f0 [ 49.808625] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 49.813190] ? mark_held_locks+0x130/0x130 [ 49.817404] ? _raw_spin_unlock+0x2c/0x50 [ 49.821538] ? ext4_discard_preallocations+0x18a/0x13c0 [ 49.826886] ? trace_hardirqs_on+0xbd/0x310 [ 49.831302] ? ext4_exit_mballoc+0xc0/0xc0 [ 49.835521] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 49.840526] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 49.845311] ? modules_open+0xa0/0xa0 [ 49.849101] ? __es_tree_search.isra.12+0x1ba/0x220 [ 49.854104] ? __es_remove_extent+0x9a3/0xba0 [ 49.858589] ? mark_held_locks+0x130/0x130 [ 49.862806] ? lock_downgrade+0x900/0x900 [ 49.866934] ? ext4_es_scan+0x960/0x960 [ 49.870888] ? lock_release+0x970/0x970 [ 49.874846] ? trace_hardirqs_on+0xbd/0x310 [ 49.879146] ? kasan_check_read+0x11/0x20 [ 49.883273] ? clear_inode+0x114/0x3a0 [ 49.887141] ? do_raw_write_trylock+0x1c0/0x1c0 [ 49.891790] ? kasan_check_write+0x14/0x20 [ 49.896005] ? lock_acquire+0x1ed/0x520 [ 49.899956] ? integrity_inode_free+0x77/0x320 [ 49.904524] ? ext4_es_remove_extent+0x151/0x500 [ 49.909259] ? lock_release+0x970/0x970 [ 49.913216] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 49.918303] ? depot_save_stack+0x292/0x470 [ 49.922609] ? kasan_check_write+0x14/0x20 [ 49.926826] ? do_raw_write_lock+0xbd/0x1b0 [ 49.931131] integrity_inode_free+0x12f/0x320 [ 49.935617] security_inode_free+0x19/0x90 [ 49.939832] __destroy_inode+0x328/0x820 [ 49.943875] ? generic_update_time+0x450/0x450 [ 49.948437] ? evict+0x5d8/0x980 [ 49.951789] ? lock_downgrade+0x900/0x900 [ 49.955915] ? __inode_wait_for_writeback+0x2cf/0x380 [ 49.961085] destroy_inode+0xda/0x200 [ 49.964868] ? __destroy_inode+0x820/0x820 [ 49.969082] ? kasan_check_write+0x14/0x20 [ 49.973301] ? do_raw_spin_lock+0xc1/0x200 [ 49.977524] evict+0x5e0/0x980 [ 49.980699] ? jbd2_journal_stop+0x430/0x15d0 [ 49.985177] ? destroy_inode+0x200/0x200 [ 49.989218] ? do_raw_spin_lock+0xc1/0x200 [ 49.993433] ? iput+0x671/0xa90 [ 49.996698] ? lock_downgrade+0x900/0x900 [ 50.000825] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 50.006346] ? kasan_check_read+0x11/0x20 [ 50.010483] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 50.015049] ? lock_downgrade+0x900/0x900 [ 50.019187] ? ext4_ioctl+0x231b/0x4210 [ 50.023144] iput+0x679/0xa90 [ 50.026233] ? inode_add_lru+0x2a0/0x2a0 [ 50.030272] ? up_write+0x7b/0x220 [ 50.033791] ? up_read+0x110/0x110 [ 50.037389] ? up_read+0x110/0x110 [ 50.040920] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.046443] ? check_preemption_disabled+0x48/0x200 [ 50.051480] ext4_ioctl+0x236f/0x4210 [ 50.055474] ? is_bpf_text_address+0xac/0x170 [ 50.059959] ? ext4_ioctl_group_add+0x560/0x560 [ 50.064619] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 50.070403] ? kasan_check_read+0x11/0x20 [ 50.074539] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 50.079796] ? rcu_bh_qs+0xc0/0xc0 [ 50.083315] ? unwind_dump+0x190/0x190 [ 50.087190] ? is_bpf_text_address+0xd3/0x170 [ 50.091668] ? kernel_text_address+0x79/0xf0 [ 50.096057] ? __kernel_text_address+0xd/0x40 [ 50.100533] ? unwind_get_return_address+0x61/0xa0 [ 50.105447] ? __save_stack_trace+0x8d/0xf0 [ 50.109857] ? save_stack+0xa9/0xd0 [ 50.113476] ? save_stack+0x43/0xd0 [ 50.117084] ? __kasan_slab_free+0x102/0x150 [ 50.121481] ? kasan_slab_free+0xe/0x10 [ 50.125433] ? kmem_cache_free+0x83/0x290 [ 50.129561] ? putname+0xf2/0x130 [ 50.132995] ? do_sys_open+0x54d/0x700 [ 50.136860] ? __x64_sys_openat+0x9d/0x100 [ 50.141075] ? do_syscall_64+0x1b9/0x820 [ 50.145120] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.150473] ? trace_hardirqs_off+0xb8/0x310 [ 50.154861] ? kasan_check_read+0x11/0x20 [ 50.158988] ? do_raw_spin_unlock+0xa7/0x2f0 [ 50.163378] ? trace_hardirqs_on+0x310/0x310 [ 50.167765] ? kasan_check_write+0x14/0x20 [ 50.171983] ? trace_hardirqs_off+0xb8/0x310 [ 50.176370] ? trace_hardirqs_on+0x310/0x310 [ 50.180760] ? ext4_ioctl_group_add+0x560/0x560 [ 50.185413] do_vfs_ioctl+0x1de/0x1720 [ 50.189286] ? trace_hardirqs_on+0xbd/0x310 [ 50.193592] ? ioctl_preallocate+0x300/0x300 [ 50.197983] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.203503] ? __fget_light+0x2e9/0x430 [ 50.207462] ? fget_raw+0x20/0x20 [ 50.210896] ? putname+0xf2/0x130 [ 50.214332] ? kmem_cache_free+0x21a/0x290 [ 50.218546] ? putname+0xf7/0x130 [ 50.221983] ? security_file_ioctl+0x94/0xc0 [ 50.226379] ksys_ioctl+0xa9/0xd0 [ 50.229821] __x64_sys_ioctl+0x73/0xb0 [ 50.233699] do_syscall_64+0x1b9/0x820 [ 50.237568] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 50.242913] ? syscall_return_slowpath+0x5e0/0x5e0 [ 50.247824] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.252650] ? trace_hardirqs_on_caller+0x310/0x310 [ 50.257646] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 50.262642] ? prepare_exit_to_usermode+0x291/0x3b0 [ 50.267640] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.272477] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.277655] RIP: 0033:0x440009 [ 50.280842] 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 [ 50.299733] RSP: 002b:00007ffeabad52f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 50.307429] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440009 [ 50.314680] RDX: 0000000000440009 RSI: 0000000000006611 RDI: 0000000000000003 [ 50.321932] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 50.329246] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401890 [ 50.336513] R13: 0000000000401920 R14: 0000000000000000 R15: 0000000000000000 [ 50.343901] Modules linked in: [ 50.347210] ---[ end trace 35fe4ad96f829d6f ]--- [ 50.352074] RIP: 0010:rb_erase+0x306/0x3710 [ 50.356385] 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 [ 50.375543] RSP: 0018:ffff8801bc61e918 EFLAGS: 00010202 [ 50.380925] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 50.388213] RDX: 1ffff100378c3d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 50.395508] RBP: ffff8801bc61f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 50.402796] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801b924e1f0 [ 50.410065] R13: dffffc0000000000 R14: ffff8801bc61f2f8 R15: ffff8801bc61f438 [ 50.417365] FS: 0000000001b1f880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 50.425615] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.431598] CR2: 0000000020000080 CR3: 00000001d7b90000 CR4: 00000000001406f0 [ 50.438873] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.446160] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.453523] Kernel panic - not syncing: Fatal exception [ 50.459832] Kernel Offset: disabled [ 50.463453] Rebooting in 86400 seconds..