[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.665259] audit: type=1800 audit(1538618712.114:25): pid=5892 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 36.684435] audit: type=1800 audit(1538618712.114:26): pid=5892 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.707518] audit: type=1800 audit(1538618712.114:27): pid=5892 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 '10.128.0.31' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 49.552409] kasan: CONFIG_KASAN_INLINE enabled [ 49.557038] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 49.564435] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 49.570670] CPU: 1 PID: 6045 Comm: syz-executor165 Not tainted 4.19.0-rc6-next-20181003+ #86 [ 49.579313] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.588661] RIP: 0010:rb_erase+0x306/0x3710 [ 49.592972] 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 [ 49.612110] RSP: 0018:ffff8801c2f56918 EFLAGS: 00010202 [ 49.617465] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 49.624723] RDX: 1ffff100385ead2b RSI: ffffffff8afa8b00 RDI: 0000000000000008 [ 49.632095] RBP: ffff8801c2f57320 R08: dffffc0000000000 R09: fffffbfff12d702c [ 49.639356] R10: fffffbfff12d702c R11: ffffffff896b8163 R12: ffff8801b8f841f0 [ 49.646683] R13: dffffc0000000000 R14: ffff8801c2f572f8 R15: ffff8801c2f57438 [ 49.653943] FS: 0000000001cc3880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 49.662233] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 49.668146] CR2: 0000000020000700 CR3: 00000001d5a19000 CR4: 00000000001406e0 [ 49.675413] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 49.682668] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 49.690020] Call Trace: [ 49.692616] ? rb_insert_color+0x1460/0x1460 [ 49.697014] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 49.701756] ? is_bpf_text_address+0xac/0x170 [ 49.706237] ? lock_downgrade+0x900/0x900 [ 49.710373] ? mark_held_locks+0x130/0x130 [ 49.714597] ? kasan_check_read+0x11/0x20 [ 49.718730] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 49.723995] ? rcu_softirq_qs+0x20/0x20 [ 49.727958] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.733545] ? mark_page_accessed+0xcaf/0x2040 [ 49.738146] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 49.743674] ? activate_page+0x1040/0x1040 [ 49.748001] ? mark_held_locks+0x130/0x130 [ 49.752228] ? __kernel_text_address+0xd/0x40 [ 49.756816] ? unwind_get_return_address+0x61/0xa0 [ 49.761744] ? pagecache_get_page+0x2d8/0xf00 [ 49.766234] ? ima_store_template+0x224/0x310 [ 49.770762] ? ima_store_measurement+0x321/0x630 [ 49.775511] ? find_get_pages_contig+0x18d0/0x18d0 [ 49.780433] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 49.785440] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 49.790185] ? is_bpf_text_address+0xac/0x170 [ 49.794664] ? lock_downgrade+0x900/0x900 [ 49.798843] ? mark_held_locks+0x130/0x130 [ 49.803078] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 49.808003] ? mark_held_locks+0x130/0x130 [ 49.812228] ? ext4_discard_preallocations+0x9b4/0x13b0 [ 49.817582] ? lock_downgrade+0x900/0x900 [ 49.821719] ? kasan_check_read+0x11/0x20 [ 49.825865] ? do_raw_spin_unlock+0xa7/0x2f0 [ 49.830260] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 49.834827] ? mark_held_locks+0x130/0x130 [ 49.839051] ? _raw_spin_unlock+0x2c/0x50 [ 49.843188] ? ext4_discard_preallocations+0x18a/0x13b0 [ 49.848585] ? __getblk_gfp+0x102/0x1030 [ 49.852667] ? ext4_exit_mballoc+0xc0/0xc0 [ 49.856892] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 49.861907] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 49.866650] ? modules_open+0xa0/0xa0 [ 49.870435] ? __es_tree_search.isra.12+0x1ba/0x220 [ 49.875550] ? __es_remove_extent+0x9a3/0xba0 [ 49.880029] ? mark_held_locks+0x130/0x130 [ 49.884261] ? lock_downgrade+0x900/0x900 [ 49.888394] ? ext4_es_scan+0x950/0x950 [ 49.892355] ? lock_release+0x970/0x970 [ 49.896320] ? trace_hardirqs_on+0xbd/0x310 [ 49.900626] ? kasan_check_read+0x11/0x20 [ 49.904771] ? clear_inode+0x114/0x3a0 [ 49.909043] ? do_raw_write_trylock+0x1c0/0x1c0 [ 49.913719] ? kasan_check_write+0x14/0x20 [ 49.917988] ? lock_acquire+0x1ed/0x520 [ 49.921961] ? integrity_inode_free+0x77/0x320 [ 49.926529] ? ext4_es_remove_extent+0x14c/0x4f0 [ 49.931268] ? lock_release+0x970/0x970 [ 49.935231] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 49.940320] ? depot_save_stack+0x292/0x470 [ 49.944625] ? kasan_check_write+0x14/0x20 [ 49.948839] ? do_raw_write_lock+0xbd/0x1b0 [ 49.953154] integrity_inode_free+0x12f/0x320 [ 49.957643] security_inode_free+0x19/0x90 [ 49.961874] __destroy_inode+0x328/0x820 [ 49.965924] ? generic_update_time+0x450/0x450 [ 49.970503] ? evict+0x5d8/0x980 [ 49.973862] ? lock_downgrade+0x900/0x900 [ 49.977998] ? __inode_wait_for_writeback+0x2cf/0x380 [ 49.983176] destroy_inode+0xda/0x200 [ 49.986957] ? __destroy_inode+0x820/0x820 [ 49.991176] ? kasan_check_write+0x14/0x20 [ 49.995515] ? do_raw_spin_lock+0xc1/0x200 [ 49.999740] evict+0x5e0/0x980 [ 50.002920] ? jbd2_journal_stop+0x430/0x15c0 [ 50.007404] ? destroy_inode+0x200/0x200 [ 50.011451] ? do_raw_spin_lock+0xc1/0x200 [ 50.015675] ? iput+0x66c/0xa90 [ 50.018944] ? lock_downgrade+0x900/0x900 [ 50.023082] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 50.028616] ? kasan_check_read+0x11/0x20 [ 50.032818] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 50.037400] ? lock_downgrade+0x900/0x900 [ 50.041599] ? ext4_ioctl+0x2316/0x4210 [ 50.045570] iput+0x674/0xa90 [ 50.048663] ? inode_add_lru+0x2a0/0x2a0 [ 50.052711] ? up_write+0x7b/0x220 [ 50.056235] ? down_write_nested+0x130/0x130 [ 50.060629] ? down_write_nested+0x130/0x130 [ 50.065026] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.070550] ? check_preemption_disabled+0x48/0x200 [ 50.075601] ext4_ioctl+0x236a/0x4210 [ 50.079520] ? ext4_ioctl_group_add+0x560/0x560 [ 50.084183] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 50.089098] ? kasan_check_read+0x11/0x20 [ 50.093232] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 50.098693] ? rcu_softirq_qs+0x20/0x20 [ 50.102654] ? unwind_dump+0x190/0x190 [ 50.106597] ? is_bpf_text_address+0xd3/0x170 [ 50.111087] ? kernel_text_address+0x79/0xf0 [ 50.115479] ? __kernel_text_address+0xd/0x40 [ 50.119965] ? unwind_get_return_address+0x61/0xa0 [ 50.124972] ? __save_stack_trace+0x8d/0xf0 [ 50.129290] ? save_stack+0xa9/0xd0 [ 50.132898] ? save_stack+0x43/0xd0 [ 50.136511] ? __kasan_slab_free+0x102/0x150 [ 50.140902] ? kasan_slab_free+0xe/0x10 [ 50.144928] ? kmem_cache_free+0x83/0x290 [ 50.149063] ? putname+0xf2/0x130 [ 50.152498] ? do_sys_open+0x54d/0x700 [ 50.156436] ? __x64_sys_open+0x7e/0xc0 [ 50.160405] ? do_syscall_64+0x1b9/0x820 [ 50.164466] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.169820] ? trace_hardirqs_off+0xb8/0x310 [ 50.174215] ? kasan_check_read+0x11/0x20 [ 50.178356] ? do_raw_spin_unlock+0xa7/0x2f0 [ 50.182757] ? trace_hardirqs_on+0x310/0x310 [ 50.187152] ? kasan_check_write+0x14/0x20 [ 50.191379] ? trace_hardirqs_off+0xb8/0x310 [ 50.195825] ? ext4_ioctl_group_add+0x560/0x560 [ 50.200502] do_vfs_ioctl+0x1de/0x1720 [ 50.204431] ? trace_hardirqs_on+0xbd/0x310 [ 50.208752] ? ioctl_preallocate+0x300/0x300 [ 50.213153] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.218679] ? __fget_light+0x2e9/0x430 [ 50.222647] ? fget_raw+0x20/0x20 [ 50.226088] ? putname+0xf2/0x130 [ 50.229526] ? kmem_cache_free+0x21a/0x290 [ 50.233750] ? putname+0xf7/0x130 [ 50.237248] ? do_sys_open+0x3ac/0x700 [ 50.241144] ? security_file_ioctl+0x94/0xc0 [ 50.245934] ksys_ioctl+0xa9/0xd0 [ 50.249374] __x64_sys_ioctl+0x73/0xb0 [ 50.253254] do_syscall_64+0x1b9/0x820 [ 50.257132] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 50.262485] ? syscall_return_slowpath+0x5e0/0x5e0 [ 50.267406] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.272321] ? trace_hardirqs_on_caller+0x310/0x310 [ 50.277337] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 50.282342] ? prepare_exit_to_usermode+0x291/0x3b0 [ 50.287398] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.292239] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.297416] RIP: 0033:0x440029 [ 50.300601] 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 [ 50.319565] RSP: 002b:00007ffdaf22cd18 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 50.327383] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 50.334651] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000004 [ 50.342010] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 50.349273] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018b0 [ 50.356533] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 50.363797] Modules linked in: [ 50.367337] ---[ end trace 39f7c3fcefbb397f ]--- [ 50.372131] RIP: 0010:rb_erase+0x306/0x3710 [ 50.376446] 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 [ 50.395407] RSP: 0018:ffff8801c2f56918 EFLAGS: 00010202 [ 50.400841] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 50.408148] RDX: 1ffff100385ead2b RSI: ffffffff8afa8b00 RDI: 0000000000000008 [ 50.415454] RBP: ffff8801c2f57320 R08: dffffc0000000000 R09: fffffbfff12d702c [ 50.422744] R10: fffffbfff12d702c R11: ffffffff896b8163 R12: ffff8801b8f841f0 [ 50.430002] R13: dffffc0000000000 R14: ffff8801c2f572f8 R15: ffff8801c2f57438 [ 50.437439] FS: 0000000001cc3880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 50.445769] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.451755] CR2: 0000000020000700 CR3: 00000001d5a19000 CR4: 00000000001406e0 [ 50.459039] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.466345] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.473631] Kernel panic - not syncing: Fatal exception [ 50.479907] Kernel Offset: disabled [ 50.483545] Rebooting in 86400 seconds..