[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.707391] audit: type=1800 audit(1538157631.952:25): pid=5906 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 36.726497] audit: type=1800 audit(1538157631.952:26): pid=5906 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.754570] audit: type=1800 audit(1538157631.952:27): pid=5906 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: [ 47.148917] kasan: CONFIG_KASAN_INLINE enabled [ 47.153516] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 47.160915] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.167153] CPU: 1 PID: 6062 Comm: syz-executor295 Not tainted 4.19.0-rc5-next-20180928+ #84 [ 47.175706] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.185059] RIP: 0010:rb_erase+0x306/0x3710 [ 47.189376] 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 [ 47.208267] RSP: 0018:ffff8801bbd56918 EFLAGS: 00010202 [ 47.213608] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 47.220862] RDX: 1ffff100377aad2b RSI: ffffffff8afa83c0 RDI: 0000000000000008 [ 47.228127] RBP: ffff8801bbd57320 R08: dffffc0000000000 R09: fffffbfff12d6fb8 [ 47.235378] R10: fffffbfff12d6fb8 R11: ffffffff896b7dc3 R12: ffff8801b93501f0 [ 47.242642] R13: dffffc0000000000 R14: ffff8801bbd572f8 R15: ffff8801bbd57438 [ 47.249912] FS: 0000000000777880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 47.258134] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.263996] CR2: 0000000020000080 CR3: 00000001bbcb3000 CR4: 00000000001406e0 [ 47.271258] Call Trace: [ 47.273844] ? find_get_entry+0x2f2/0xc40 [ 47.277986] ? rb_insert_color+0x1460/0x1460 [ 47.282397] ? add_to_page_cache_lru+0xdb0/0xdb0 [ 47.287173] ? is_bpf_text_address+0xac/0x170 [ 47.291757] ? lock_downgrade+0x900/0x900 [ 47.295920] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 47.300837] ? mark_held_locks+0x130/0x130 [ 47.305066] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 47.310739] ? rcu_softirq_qs+0x20/0x20 [ 47.314991] ? unwind_dump+0x190/0x190 [ 47.319277] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.325056] ? mark_page_accessed+0xcaf/0x2040 [ 47.329654] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.335354] ? activate_page+0x1040/0x1040 [ 47.339917] ? mark_held_locks+0x130/0x130 [ 47.344136] ? unwind_get_return_address+0x61/0xa0 [ 47.349050] ? __save_stack_trace+0x8d/0xf0 [ 47.353365] ? pagecache_get_page+0x2d8/0xf00 [ 47.357850] ? process_measurement+0x15c4/0x1bf0 [ 47.362586] ? ima_file_check+0xe5/0x130 [ 47.366637] ? find_get_pages_contig+0x15b0/0x15b0 [ 47.371554] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 47.376557] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 47.381326] ? is_bpf_text_address+0xac/0x170 [ 47.385808] ? lock_downgrade+0x900/0x900 [ 47.389949] ? mark_held_locks+0x130/0x130 [ 47.394184] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 47.399109] ? mark_held_locks+0x130/0x130 [ 47.403393] ? ext4_discard_preallocations+0x9b4/0x13b0 [ 47.408765] ? lock_downgrade+0x900/0x900 [ 47.412900] ? kasan_check_read+0x11/0x20 [ 47.417054] ? do_raw_spin_unlock+0xa7/0x2f0 [ 47.421447] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 47.426013] ? mark_held_locks+0x130/0x130 [ 47.430252] ? _raw_spin_unlock+0x2c/0x50 [ 47.434392] ? ext4_discard_preallocations+0x18a/0x13b0 [ 47.439759] ? __getblk_gfp+0x102/0x1040 [ 47.443805] ? ext4_exit_mballoc+0xc0/0xc0 [ 47.448027] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 47.453028] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 47.457768] ? modules_open+0xa0/0xa0 [ 47.461556] ? __es_tree_search.isra.12+0x1ba/0x220 [ 47.466560] ? __es_remove_extent+0x9a3/0xba0 [ 47.471052] ? mark_held_locks+0x130/0x130 [ 47.475277] ? lock_downgrade+0x900/0x900 [ 47.479409] ? ext4_es_scan+0x950/0x950 [ 47.483367] ? lock_release+0x970/0x970 [ 47.487333] ? trace_hardirqs_on+0xbd/0x310 [ 47.491639] ? kasan_check_read+0x11/0x20 [ 47.495772] ? clear_inode+0x114/0x3a0 [ 47.499644] ? do_raw_write_trylock+0x1c0/0x1c0 [ 47.504302] ? kasan_check_write+0x14/0x20 [ 47.508536] ? lock_acquire+0x1ed/0x520 [ 47.512494] ? integrity_inode_free+0x77/0x320 [ 47.517060] ? ext4_es_remove_extent+0x14c/0x4f0 [ 47.521800] ? lock_release+0x970/0x970 [ 47.525760] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 47.530853] ? depot_save_stack+0x292/0x470 [ 47.535172] ? kasan_check_write+0x14/0x20 [ 47.539395] ? do_raw_write_lock+0xbd/0x1b0 [ 47.543701] integrity_inode_free+0x12f/0x320 [ 47.548179] security_inode_free+0x19/0x90 [ 47.552403] __destroy_inode+0x328/0x820 [ 47.556452] ? generic_update_time+0x450/0x450 [ 47.561017] ? evict+0x5d8/0x980 [ 47.564397] ? lock_downgrade+0x900/0x900 [ 47.568530] ? __inode_wait_for_writeback+0x2cf/0x380 [ 47.573709] destroy_inode+0xda/0x200 [ 47.577553] ? __destroy_inode+0x820/0x820 [ 47.581788] ? kasan_check_write+0x14/0x20 [ 47.586007] ? do_raw_spin_lock+0xc1/0x200 [ 47.590226] evict+0x5e0/0x980 [ 47.593405] ? jbd2_journal_stop+0x430/0x15c0 [ 47.597888] ? destroy_inode+0x200/0x200 [ 47.601952] ? do_raw_spin_lock+0xc1/0x200 [ 47.606170] ? iput+0x66c/0xa90 [ 47.609436] ? lock_downgrade+0x900/0x900 [ 47.613569] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 47.619098] ? kasan_check_read+0x11/0x20 [ 47.623238] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 47.627908] ? lock_downgrade+0x900/0x900 [ 47.632045] ? ext4_ioctl+0x2316/0x4210 [ 47.636008] iput+0x674/0xa90 [ 47.639103] ? inode_add_lru+0x2a0/0x2a0 [ 47.643166] ? up_write+0x7b/0x220 [ 47.646759] ? down_write_nested+0x130/0x130 [ 47.651158] ? down_write_nested+0x130/0x130 [ 47.655562] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.661091] ? check_preemption_disabled+0x48/0x200 [ 47.666120] ext4_ioctl+0x236a/0x4210 [ 47.669910] ? is_bpf_text_address+0xac/0x170 [ 47.674394] ? ext4_ioctl_group_add+0x560/0x560 [ 47.679058] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 47.683987] ? kasan_check_read+0x11/0x20 [ 47.688116] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 47.693377] ? rcu_softirq_qs+0x20/0x20 [ 47.697341] ? unwind_dump+0x190/0x190 [ 47.701214] ? is_bpf_text_address+0xd3/0x170 [ 47.705696] ? kernel_text_address+0x79/0xf0 [ 47.710099] ? __kernel_text_address+0xd/0x40 [ 47.714582] ? unwind_get_return_address+0x61/0xa0 [ 47.719498] ? __save_stack_trace+0x8d/0xf0 [ 47.723806] ? save_stack+0xa9/0xd0 [ 47.727415] ? save_stack+0x43/0xd0 [ 47.731023] ? __kasan_slab_free+0x102/0x150 [ 47.735414] ? kasan_slab_free+0xe/0x10 [ 47.739369] ? kmem_cache_free+0x83/0x290 [ 47.743502] ? putname+0xf2/0x130 [ 47.746935] ? do_sys_open+0x54d/0x700 [ 47.750802] ? __x64_sys_openat+0x9d/0x100 [ 47.755100] ? do_syscall_64+0x1b9/0x820 [ 47.759166] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.764518] ? trace_hardirqs_off+0xb8/0x310 [ 47.768908] ? kasan_check_read+0x11/0x20 [ 47.773039] ? do_raw_spin_unlock+0xa7/0x2f0 [ 47.777435] ? trace_hardirqs_on+0x310/0x310 [ 47.781898] ? kasan_check_write+0x14/0x20 [ 47.786124] ? trace_hardirqs_off+0xb8/0x310 [ 47.790516] ? trace_hardirqs_on+0x310/0x310 [ 47.794911] ? ext4_ioctl_group_add+0x560/0x560 [ 47.799563] do_vfs_ioctl+0x1de/0x1720 [ 47.803534] ? trace_hardirqs_on+0xbd/0x310 [ 47.807947] ? ioctl_preallocate+0x300/0x300 [ 47.812348] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.817874] ? __fget_light+0x2e9/0x430 [ 47.821833] ? fget_raw+0x20/0x20 [ 47.825273] ? putname+0xf2/0x130 [ 47.828711] ? kmem_cache_free+0x21a/0x290 [ 47.832927] ? putname+0xf7/0x130 [ 47.836371] ? security_file_ioctl+0x94/0xc0 [ 47.840911] ksys_ioctl+0xa9/0xd0 [ 47.844356] __x64_sys_ioctl+0x73/0xb0 [ 47.848341] do_syscall_64+0x1b9/0x820 [ 47.852223] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 47.857578] ? syscall_return_slowpath+0x5e0/0x5e0 [ 47.862493] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.867331] ? trace_hardirqs_on_caller+0x310/0x310 [ 47.872340] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 47.877508] ? prepare_exit_to_usermode+0x291/0x3b0 [ 47.882516] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.887354] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.892530] RIP: 0033:0x440089 [ 47.895709] 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 [ 47.914649] RSP: 002b:00007fff0240d768 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 47.922356] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440089 [ 47.929609] RDX: 0000000000440089 RSI: 0000000000006611 RDI: 0000000000000003 [ 47.936915] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 47.944185] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401910 [ 47.951454] R13: 00000000004019a0 R14: 0000000000000000 R15: 0000000000000000 [ 47.958715] Modules linked in: [ 47.962014] ---[ end trace c1ad46f012550969 ]--- [ 47.966809] RIP: 0010:rb_erase+0x306/0x3710 [ 47.971121] 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 [ 47.990202] RSP: 0018:ffff8801bbd56918 EFLAGS: 00010202 [ 47.995597] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 48.002854] RDX: 1ffff100377aad2b RSI: ffffffff8afa83c0 RDI: 0000000000000008 [ 48.010149] RBP: ffff8801bbd57320 R08: dffffc0000000000 R09: fffffbfff12d6fb8 [ 48.017431] R10: fffffbfff12d6fb8 R11: ffffffff896b7dc3 R12: ffff8801b93501f0 [ 48.024729] R13: dffffc0000000000 R14: ffff8801bbd572f8 R15: ffff8801bbd57438 [ 48.031995] FS: 0000000000777880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 48.040264] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.046150] CR2: 0000000020000080 CR3: 00000001bbcb3000 CR4: 00000000001406e0 [ 48.053407] Kernel panic - not syncing: Fatal exception [ 48.059729] Kernel Offset: disabled [ 48.063360] Rebooting in 86400 seconds..