[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.116064] audit: type=1800 audit(1538348115.978:25): pid=5661 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 35.150165] audit: type=1800 audit(1538348115.978:26): pid=5661 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 35.173348] audit: type=1800 audit(1538348115.978:27): pid=5661 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 '10.128.10.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.717807] kasan: CONFIG_KASAN_INLINE enabled [ 42.722423] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 42.729812] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 42.736051] CPU: 1 PID: 5813 Comm: syz-executor994 Not tainted 4.19.0-rc5+ #122 [ 42.743481] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.752827] RIP: 0010:rb_erase+0x306/0x3710 [ 42.757131] 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 [ 42.776015] RSP: 0018:ffff8801bc39e918 EFLAGS: 00010202 [ 42.781375] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 42.788632] RDX: 1ffff10037873d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 42.795893] RBP: ffff8801bc39f320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 42.803145] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b8f491f0 [ 42.810397] R13: dffffc0000000000 R14: ffff8801bc39f2f8 R15: ffff8801bc39f438 [ 42.817651] FS: 0000000001c2e880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 42.825858] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.831722] CR2: 0000000020000080 CR3: 00000001bbdf8000 CR4: 00000000001406e0 [ 42.838978] Call Trace: [ 42.841553] ? rb_insert_color+0x1460/0x1460 [ 42.845953] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 42.850868] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.856652] ? mark_held_locks+0x130/0x130 [ 42.860872] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 42.866132] ? rcu_bh_qs+0xc0/0xc0 [ 42.869651] ? unwind_dump+0x190/0x190 [ 42.873525] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 42.879046] ? mark_held_locks+0x130/0x130 [ 42.883264] ? mark_page_accessed+0xcb0/0x2040 [ 42.887825] ? activate_page+0x1040/0x1040 [ 42.892042] ? activate_page+0x1040/0x1040 [ 42.896266] ? mark_held_locks+0x130/0x130 [ 42.900483] ? kasan_kmalloc+0xc7/0xe0 [ 42.904352] ? kmem_cache_alloc_trace+0x152/0x750 [ 42.909175] ? ima_add_digest_entry+0xcb/0x6a0 [ 42.913746] ? ima_add_template_entry+0x466/0x7f0 [ 42.918570] ? ima_store_template+0x224/0x310 [ 42.923048] ? pagecache_get_page+0x2d8/0xf00 [ 42.927529] ? find_get_pages_contig+0x15b0/0x15b0 [ 42.932445] ? is_bpf_text_address+0xac/0x170 [ 42.936923] ? lock_downgrade+0x900/0x900 [ 42.941052] ? mark_held_locks+0x130/0x130 [ 42.945270] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 42.951052] ? mark_held_locks+0x130/0x130 [ 42.955297] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 42.960644] ? lock_downgrade+0x900/0x900 [ 42.964778] ? kasan_check_read+0x11/0x20 [ 42.968909] ? do_raw_spin_unlock+0xa7/0x2f0 [ 42.973299] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 42.977865] ? mark_held_locks+0x130/0x130 [ 42.982082] ? _raw_spin_unlock+0x2c/0x50 [ 42.986222] ? ext4_discard_preallocations+0x18a/0x13c0 [ 42.991571] ? trace_hardirqs_on+0xbd/0x310 [ 42.995881] ? ext4_exit_mballoc+0xc0/0xc0 [ 43.000105] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 43.005126] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 43.009869] ? modules_open+0xa0/0xa0 [ 43.013655] ? __es_tree_search.isra.12+0x1ba/0x220 [ 43.018655] ? __es_remove_extent+0x9a3/0xba0 [ 43.023137] ? mark_held_locks+0x130/0x130 [ 43.027354] ? lock_downgrade+0x900/0x900 [ 43.031487] ? ext4_es_scan+0x960/0x960 [ 43.035442] ? lock_release+0x970/0x970 [ 43.039401] ? trace_hardirqs_on+0xbd/0x310 [ 43.043705] ? kasan_check_read+0x11/0x20 [ 43.047838] ? clear_inode+0x114/0x3a0 [ 43.051707] ? do_raw_write_trylock+0x1c0/0x1c0 [ 43.056365] ? kasan_check_write+0x14/0x20 [ 43.060601] ? lock_acquire+0x1ed/0x520 [ 43.064555] ? integrity_inode_free+0x77/0x320 [ 43.069123] ? ext4_es_remove_extent+0x151/0x500 [ 43.073864] ? lock_release+0x970/0x970 [ 43.077822] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 43.082908] ? depot_save_stack+0x292/0x470 [ 43.087224] ? kasan_check_write+0x14/0x20 [ 43.091450] ? do_raw_write_lock+0xbd/0x1b0 [ 43.095756] integrity_inode_free+0x12f/0x320 [ 43.100248] security_inode_free+0x19/0x90 [ 43.104468] __destroy_inode+0x328/0x820 [ 43.108515] ? generic_update_time+0x450/0x450 [ 43.113081] ? evict+0x5d8/0x980 [ 43.116433] ? lock_downgrade+0x900/0x900 [ 43.120565] ? __inode_wait_for_writeback+0x2cf/0x380 [ 43.125744] destroy_inode+0xda/0x200 [ 43.129526] ? __destroy_inode+0x820/0x820 [ 43.133749] ? kasan_check_write+0x14/0x20 [ 43.137972] ? do_raw_spin_lock+0xc1/0x200 [ 43.142204] evict+0x5e0/0x980 [ 43.145383] ? jbd2_journal_stop+0x430/0x15d0 [ 43.149863] ? destroy_inode+0x200/0x200 [ 43.153910] ? do_raw_spin_lock+0xc1/0x200 [ 43.158130] ? iput+0x671/0xa90 [ 43.161393] ? lock_downgrade+0x900/0x900 [ 43.165530] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 43.171050] ? kasan_check_read+0x11/0x20 [ 43.175185] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 43.179760] ? lock_downgrade+0x900/0x900 [ 43.183893] ? ext4_ioctl+0x231b/0x4210 [ 43.187853] iput+0x679/0xa90 [ 43.190946] ? inode_add_lru+0x2a0/0x2a0 [ 43.195009] ? up_write+0x7b/0x220 [ 43.198542] ? up_read+0x110/0x110 [ 43.202063] ? up_read+0x110/0x110 [ 43.205606] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.211128] ? check_preemption_disabled+0x48/0x200 [ 43.216131] ext4_ioctl+0x236f/0x4210 [ 43.219916] ? is_bpf_text_address+0xac/0x170 [ 43.224393] ? ext4_ioctl_group_add+0x560/0x560 [ 43.229049] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 43.234830] ? kasan_check_read+0x11/0x20 [ 43.238967] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 43.244226] ? rcu_bh_qs+0xc0/0xc0 [ 43.247751] ? unwind_dump+0x190/0x190 [ 43.251626] ? is_bpf_text_address+0xd3/0x170 [ 43.256105] ? kernel_text_address+0x79/0xf0 [ 43.260493] ? __kernel_text_address+0xd/0x40 [ 43.264975] ? unwind_get_return_address+0x61/0xa0 [ 43.269922] ? __save_stack_trace+0x8d/0xf0 [ 43.274252] ? save_stack+0xa9/0xd0 [ 43.277861] ? save_stack+0x43/0xd0 [ 43.281468] ? __kasan_slab_free+0x102/0x150 [ 43.285860] ? kasan_slab_free+0xe/0x10 [ 43.290072] ? kmem_cache_free+0x83/0x290 [ 43.294207] ? putname+0xf2/0x130 [ 43.297647] ? do_sys_open+0x54d/0x700 [ 43.301513] ? __x64_sys_openat+0x9d/0x100 [ 43.305738] ? do_syscall_64+0x1b9/0x820 [ 43.309784] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.315133] ? trace_hardirqs_off+0xb8/0x310 [ 43.319525] ? kasan_check_read+0x11/0x20 [ 43.323656] ? do_raw_spin_unlock+0xa7/0x2f0 [ 43.328048] ? trace_hardirqs_on+0x310/0x310 [ 43.332437] ? kasan_check_write+0x14/0x20 [ 43.336655] ? trace_hardirqs_off+0xb8/0x310 [ 43.341045] ? trace_hardirqs_on+0x310/0x310 [ 43.345438] ? ext4_ioctl_group_add+0x560/0x560 [ 43.350092] do_vfs_ioctl+0x1de/0x1720 [ 43.353979] ? trace_hardirqs_on+0xbd/0x310 [ 43.358287] ? ioctl_preallocate+0x300/0x300 [ 43.362679] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.368208] ? __fget_light+0x2e9/0x430 [ 43.372186] ? fget_raw+0x20/0x20 [ 43.375747] ? putname+0xf2/0x130 [ 43.379210] ? kmem_cache_free+0x21a/0x290 [ 43.383428] ? putname+0xf7/0x130 [ 43.386869] ? security_file_ioctl+0x94/0xc0 [ 43.391262] ksys_ioctl+0xa9/0xd0 [ 43.394701] __x64_sys_ioctl+0x73/0xb0 [ 43.398578] do_syscall_64+0x1b9/0x820 [ 43.402448] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 43.407908] ? syscall_return_slowpath+0x5e0/0x5e0 [ 43.412820] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.417648] ? trace_hardirqs_on_caller+0x310/0x310 [ 43.422646] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 43.427647] ? prepare_exit_to_usermode+0x291/0x3b0 [ 43.432650] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.437493] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.442666] RIP: 0033:0x440019 [ 43.445846] 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 [ 43.464735] RSP: 002b:00007ffea5609168 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 43.472425] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440019 [ 43.479676] RDX: 0000000000440019 RSI: 0000000000006611 RDI: 0000000000000003 [ 43.486927] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 43.494178] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018a0 [ 43.501437] R13: 0000000000401930 R14: 0000000000000000 R15: 0000000000000000 [ 43.508692] Modules linked in: [ 43.512003] ---[ end trace ea282ddd00041883 ]--- [ 43.516919] RIP: 0010:rb_erase+0x306/0x3710 [ 43.521247] 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 [ 43.540184] RSP: 0018:ffff8801bc39e918 EFLAGS: 00010202 [ 43.545581] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 43.552837] RDX: 1ffff10037873d2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 43.560123] RBP: ffff8801bc39f320 R08: dffffc0000000000 R09: fffffbfff12d6a48 [ 43.567411] R10: fffffbfff12d6a48 R11: ffffffff896b5243 R12: ffff8801b8f491f0 [ 43.574667] R13: dffffc0000000000 R14: ffff8801bc39f2f8 R15: ffff8801bc39f438 [ 43.581955] FS: 0000000001c2e880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 43.590228] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.596133] CR2: 0000000020000080 CR3: 00000001bbdf8000 CR4: 00000000001406e0 [ 43.603406] Kernel panic - not syncing: Fatal exception [ 43.609697] Kernel Offset: disabled [ 43.613331] Rebooting in 86400 seconds..