[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.414660] audit: type=1800 audit(1539377561.750:25): pid=5627 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 33.439808] audit: type=1800 audit(1539377561.750:26): pid=5627 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 33.465709] audit: type=1800 audit(1539377561.760:27): pid=5627 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 '10.128.0.4' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 61.193755] kasan: CONFIG_KASAN_INLINE enabled [ 61.198350] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 61.205791] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 61.212068] CPU: 0 PID: 5780 Comm: syz-executor198 Not tainted 4.19.0-rc6+ #258 [ 61.219512] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.228872] RIP: 0010:rb_erase+0x306/0x3710 [ 61.233180] 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 [ 61.252162] RSP: 0018:ffff8801bc386918 EFLAGS: 00010202 [ 61.257506] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 61.264758] RDX: 1ffff10037870d2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 61.272012] RBP: ffff8801bc387320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 61.279262] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801b8efa1f0 [ 61.286511] R13: dffffc0000000000 R14: ffff8801bc3872f8 R15: ffff8801bc387438 [ 61.293767] FS: 000000000131d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 61.301979] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 61.307841] CR2: 0000000020000180 CR3: 00000001bc1fd000 CR4: 00000000001406f0 [ 61.315093] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 61.322343] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 61.329593] Call Trace: [ 61.332173] ? rb_insert_color+0x1460/0x1460 [ 61.336570] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 61.341484] ? lock_downgrade+0x900/0x900 [ 61.345625] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 61.351409] ? mark_held_locks+0x130/0x130 [ 61.355634] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 61.360894] ? rcu_bh_qs+0xc0/0xc0 [ 61.364417] ? unwind_dump+0x190/0x190 [ 61.368355] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 61.373884] ? mark_held_locks+0x130/0x130 [ 61.378102] ? mark_page_accessed+0xcb0/0x2040 [ 61.382667] ? activate_page+0x1040/0x1040 [ 61.386893] ? activate_page+0x1040/0x1040 [ 61.391119] ? mark_held_locks+0x130/0x130 [ 61.395436] ? kasan_kmalloc+0xc7/0xe0 [ 61.399310] ? kmem_cache_alloc_trace+0x152/0x750 [ 61.404244] ? ima_add_digest_entry+0xcb/0x6a0 [ 61.408819] ? ima_add_template_entry+0x466/0x7f0 [ 61.413647] ? ima_store_template+0x224/0x310 [ 61.418126] ? mark_held_locks+0x130/0x130 [ 61.422349] ? find_get_pages_contig+0x15b0/0x15b0 [ 61.427330] ? mark_held_locks+0x130/0x130 [ 61.431555] ? lock_downgrade+0x900/0x900 [ 61.435702] ? mark_held_locks+0x130/0x130 [ 61.439928] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 61.445716] ? mark_held_locks+0x130/0x130 [ 61.449946] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 61.455293] ? lock_downgrade+0x900/0x900 [ 61.459426] ? kasan_check_read+0x11/0x20 [ 61.463600] ? do_raw_spin_unlock+0xa7/0x2f0 [ 61.468009] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 61.472576] ? mark_held_locks+0x130/0x130 [ 61.476860] ? _raw_spin_unlock+0x2c/0x50 [ 61.480999] ? ext4_discard_preallocations+0x18a/0x13c0 [ 61.486346] ? ext4_exit_mballoc+0xc0/0xc0 [ 61.490565] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 61.495575] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 61.500323] ? modules_open+0xa0/0xa0 [ 61.504110] ? __es_tree_search.isra.12+0x1ba/0x220 [ 61.509109] ? __es_remove_extent+0x9a3/0xba0 [ 61.513589] ? mark_held_locks+0x130/0x130 [ 61.517811] ? lock_downgrade+0x900/0x900 [ 61.521945] ? ext4_es_scan+0x960/0x960 [ 61.525900] ? lock_release+0x970/0x970 [ 61.529859] ? trace_hardirqs_on+0xbd/0x310 [ 61.534161] ? kasan_check_read+0x11/0x20 [ 61.538343] ? clear_inode+0x114/0x3a0 [ 61.542226] ? do_raw_write_trylock+0x1c0/0x1c0 [ 61.546878] ? kasan_check_write+0x14/0x20 [ 61.551094] ? lock_acquire+0x1ed/0x520 [ 61.555051] ? integrity_inode_free+0x77/0x320 [ 61.559629] ? ext4_es_remove_extent+0x151/0x500 [ 61.564371] ? lock_release+0x970/0x970 [ 61.568327] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 61.573465] ? depot_save_stack+0x292/0x470 [ 61.577787] ? kasan_check_write+0x14/0x20 [ 61.582007] ? do_raw_write_lock+0xbd/0x1b0 [ 61.586315] integrity_inode_free+0x12f/0x320 [ 61.590801] security_inode_free+0x19/0x90 [ 61.595017] __destroy_inode+0x328/0x820 [ 61.599071] ? generic_update_time+0x450/0x450 [ 61.603641] ? evict+0x5d8/0x980 [ 61.606990] ? lock_downgrade+0x900/0x900 [ 61.611123] ? __inode_wait_for_writeback+0x2cf/0x380 [ 61.616357] destroy_inode+0xda/0x200 [ 61.620147] ? __destroy_inode+0x820/0x820 [ 61.624369] ? kasan_check_write+0x14/0x20 [ 61.628587] ? do_raw_spin_lock+0xc1/0x200 [ 61.632813] evict+0x5e0/0x980 [ 61.635986] ? jbd2_journal_stop+0x430/0x15d0 [ 61.640467] ? destroy_inode+0x200/0x200 [ 61.644512] ? do_raw_spin_lock+0xc1/0x200 [ 61.648731] ? iput+0x671/0xa90 [ 61.651998] ? lock_downgrade+0x900/0x900 [ 61.656130] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 61.661653] ? kasan_check_read+0x11/0x20 [ 61.665791] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 61.670423] ? lock_downgrade+0x900/0x900 [ 61.674561] ? ext4_ioctl+0x231b/0x4210 [ 61.678526] iput+0x679/0xa90 [ 61.681626] ? inode_add_lru+0x2a0/0x2a0 [ 61.685668] ? up_write+0x7b/0x220 [ 61.689188] ? up_read+0x110/0x110 [ 61.692707] ? up_read+0x110/0x110 [ 61.696238] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 61.701812] ? check_preemption_disabled+0x48/0x200 [ 61.706828] ext4_ioctl+0x236f/0x4210 [ 61.710623] ? is_bpf_text_address+0xac/0x170 [ 61.715101] ? ext4_ioctl_group_add+0x560/0x560 [ 61.719758] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 61.725547] ? kasan_check_read+0x11/0x20 [ 61.729679] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 61.734938] ? rcu_bh_qs+0xc0/0xc0 [ 61.738459] ? unwind_dump+0x190/0x190 [ 61.742332] ? is_bpf_text_address+0xd3/0x170 [ 61.746815] ? kernel_text_address+0x79/0xf0 [ 61.751210] ? __kernel_text_address+0xd/0x40 [ 61.755690] ? unwind_get_return_address+0x61/0xa0 [ 61.760605] ? __save_stack_trace+0x8d/0xf0 [ 61.764930] ? save_stack+0xa9/0xd0 [ 61.768546] ? save_stack+0x43/0xd0 [ 61.772160] ? __kasan_slab_free+0x102/0x150 [ 61.776618] ? kasan_slab_free+0xe/0x10 [ 61.780584] ? kmem_cache_free+0x83/0x290 [ 61.784715] ? putname+0xf2/0x130 [ 61.788147] ? do_sys_open+0x54d/0x700 [ 61.792016] ? __x64_sys_openat+0x9d/0x100 [ 61.796236] ? do_syscall_64+0x1b9/0x820 [ 61.800283] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 61.805639] ? trace_hardirqs_off+0xb8/0x310 [ 61.810084] ? kasan_check_read+0x11/0x20 [ 61.814235] ? do_raw_spin_unlock+0xa7/0x2f0 [ 61.818637] ? trace_hardirqs_on+0x310/0x310 [ 61.823031] ? kasan_check_write+0x14/0x20 [ 61.827246] ? trace_hardirqs_off+0xb8/0x310 [ 61.831640] ? trace_hardirqs_on+0x310/0x310 [ 61.836035] ? ext4_ioctl_group_add+0x560/0x560 [ 61.840690] do_vfs_ioctl+0x1de/0x1720 [ 61.844558] ? trace_hardirqs_on+0xbd/0x310 [ 61.848865] ? ioctl_preallocate+0x300/0x300 [ 61.853257] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 61.858858] ? __fget_light+0x2e9/0x430 [ 61.862862] ? fget_raw+0x20/0x20 [ 61.866301] ? putname+0xf2/0x130 [ 61.869754] ? kmem_cache_free+0x21a/0x290 [ 61.873981] ? putname+0xf7/0x130 [ 61.877419] ? security_file_ioctl+0x94/0xc0 [ 61.881818] ksys_ioctl+0xa9/0xd0 [ 61.885258] __x64_sys_ioctl+0x73/0xb0 [ 61.889195] do_syscall_64+0x1b9/0x820 [ 61.893077] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 61.898423] ? syscall_return_slowpath+0x5e0/0x5e0 [ 61.903335] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 61.908166] ? trace_hardirqs_on_caller+0x310/0x310 [ 61.913169] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 61.918168] ? prepare_exit_to_usermode+0x291/0x3b0 [ 61.923171] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 61.927996] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 61.933166] RIP: 0033:0x440089 [ 61.936342] 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 [ 61.955226] RSP: 002b:00007ffc1fac3428 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 61.962957] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440089 [ 61.970318] RDX: 0000000000440089 RSI: 0000000000006611 RDI: 0000000000000003 [ 61.977619] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 61.984879] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401910 [ 61.992190] R13: 00000000004019a0 R14: 0000000000000000 R15: 0000000000000000 [ 61.999487] Modules linked in: [ 62.002760] ---[ end trace 4a484aa94bd653cc ]--- [ 62.007527] RIP: 0010:rb_erase+0x306/0x3710 [ 62.011887] 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 [ 62.030981] RSP: 0018:ffff8801bc386918 EFLAGS: 00010202 [ 62.036330] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 62.043673] RDX: 1ffff10037870d2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 62.050975] RBP: ffff8801bc387320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 62.058228] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801b8efa1f0 [ 62.065521] R13: dffffc0000000000 R14: ffff8801bc3872f8 R15: ffff8801bc387438 [ 62.072833] FS: 000000000131d880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 62.081103] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 62.087027] CR2: 0000000020000180 CR3: 00000001bc1fd000 CR4: 00000000001406f0 [ 62.094441] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 62.101732] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 62.109027] Kernel panic - not syncing: Fatal exception [ 62.115215] Kernel Offset: disabled [ 62.118835] Rebooting in 86400 seconds..