[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.830159] audit: type=1800 audit(1538121701.114:25): pid=5888 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 36.849432] audit: type=1800 audit(1538121701.114:26): pid=5888 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.880184] audit: type=1800 audit(1538121701.124:27): pid=5888 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 '10.128.10.43' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 44.557142] kasan: CONFIG_KASAN_INLINE enabled [ 44.561737] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 44.569125] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 44.575376] CPU: 0 PID: 6039 Comm: syz-executor104 Not tainted 4.19.0-rc5-next-20180928+ #83 [ 44.583961] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.593319] RIP: 0010:rb_erase+0x306/0x3710 [ 44.597629] 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 [ 44.616513] RSP: 0018:ffff8801bc386918 EFLAGS: 00010202 [ 44.621870] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 44.629123] RDX: 1ffff10037870d2b RSI: ffffffff8b5563c0 RDI: 0000000000000008 [ 44.636377] RBP: ffff8801bc387320 R08: dffffc0000000000 R09: fffffbfff135db68 [ 44.643632] R10: fffffbfff135db68 R11: ffffffff89aedb43 R12: ffff8801c506d270 [ 44.650897] R13: dffffc0000000000 R14: ffff8801bc3872f8 R15: ffff8801bc387438 [ 44.658195] FS: 000000000179f880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 44.666415] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.672296] CR2: 0000000020000000 CR3: 00000001d7beb000 CR4: 00000000001406f0 [ 44.679574] Call Trace: [ 44.682145] ? find_get_entry+0x2f2/0xc40 [ 44.686279] ? rb_insert_color+0x1460/0x1460 [ 44.690671] ? add_to_page_cache_lru+0xdb0/0xdb0 [ 44.695424] ? is_bpf_text_address+0xac/0x170 [ 44.699910] ? lock_downgrade+0x900/0x900 [ 44.704043] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 44.708965] ? mark_held_locks+0x130/0x130 [ 44.713211] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 44.718489] ? rcu_softirq_qs+0x20/0x20 [ 44.722446] ? unwind_dump+0x190/0x190 [ 44.726318] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 44.731845] ? mark_page_accessed+0xcaf/0x2040 [ 44.736410] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 44.741975] ? activate_page+0x1040/0x1040 [ 44.746209] ? mark_held_locks+0x130/0x130 [ 44.750434] ? unwind_get_return_address+0x61/0xa0 [ 44.755369] ? __save_stack_trace+0x8d/0xf0 [ 44.759717] ? pagecache_get_page+0x2d8/0xf00 [ 44.764195] ? process_measurement+0x15c4/0x1bf0 [ 44.769036] ? ima_file_check+0xe5/0x130 [ 44.773107] ? find_get_pages_contig+0x15b0/0x15b0 [ 44.778022] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 44.783038] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 44.787788] ? is_bpf_text_address+0xac/0x170 [ 44.792266] ? lock_downgrade+0x900/0x900 [ 44.796401] ? mark_held_locks+0x130/0x130 [ 44.800634] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 44.805550] ? mark_held_locks+0x130/0x130 [ 44.809773] ? ext4_discard_preallocations+0x9b4/0x13b0 [ 44.815122] ? lock_downgrade+0x900/0x900 [ 44.819260] ? kasan_check_read+0x11/0x20 [ 44.823406] ? do_raw_spin_unlock+0xa7/0x2f0 [ 44.827839] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 44.832407] ? mark_held_locks+0x130/0x130 [ 44.836633] ? _raw_spin_unlock+0x2c/0x50 [ 44.840765] ? ext4_discard_preallocations+0x18a/0x13b0 [ 44.846132] ? __getblk_gfp+0x102/0x1040 [ 44.850175] ? ext4_exit_mballoc+0xc0/0xc0 [ 44.854393] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 44.859392] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 44.864131] ? modules_open+0xa0/0xa0 [ 44.867915] ? __es_tree_search.isra.12+0x1ba/0x220 [ 44.872934] ? __es_remove_extent+0x9a3/0xba0 [ 44.877415] ? mark_held_locks+0x130/0x130 [ 44.881634] ? lock_downgrade+0x900/0x900 [ 44.885764] ? ext4_es_scan+0x950/0x950 [ 44.889739] ? lock_release+0x970/0x970 [ 44.893725] ? trace_hardirqs_on+0xbd/0x310 [ 44.898028] ? kasan_check_read+0x11/0x20 [ 44.902172] ? clear_inode+0x114/0x3a0 [ 44.906041] ? do_raw_write_trylock+0x1c0/0x1c0 [ 44.910698] ? kasan_check_write+0x14/0x20 [ 44.914913] ? lock_acquire+0x1ed/0x520 [ 44.918882] ? integrity_inode_free+0x77/0x320 [ 44.923463] ? ext4_es_remove_extent+0x14c/0x4f0 [ 44.928208] ? lock_release+0x970/0x970 [ 44.932195] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 44.937282] ? depot_save_stack+0x292/0x470 [ 44.941601] ? kasan_check_write+0x14/0x20 [ 44.945818] ? do_raw_write_lock+0xbd/0x1b0 [ 44.950125] integrity_inode_free+0x12f/0x320 [ 44.954605] security_inode_free+0x19/0x90 [ 44.958864] __destroy_inode+0x328/0x820 [ 44.962930] ? generic_update_time+0x450/0x450 [ 44.967500] ? evict+0x5d8/0x980 [ 44.970860] ? lock_downgrade+0x900/0x900 [ 44.975006] ? __inode_wait_for_writeback+0x2cf/0x380 [ 44.980222] destroy_inode+0xda/0x200 [ 44.984046] ? __destroy_inode+0x820/0x820 [ 44.988270] ? kasan_check_write+0x14/0x20 [ 44.992487] ? do_raw_spin_lock+0xc1/0x200 [ 44.996706] evict+0x5e0/0x980 [ 44.999885] ? jbd2_journal_stop+0x430/0x15c0 [ 45.004366] ? destroy_inode+0x200/0x200 [ 45.008412] ? do_raw_spin_lock+0xc1/0x200 [ 45.012628] ? iput+0x66c/0xa90 [ 45.015892] ? lock_downgrade+0x900/0x900 [ 45.020038] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 45.025566] ? kasan_check_read+0x11/0x20 [ 45.029695] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 45.034260] ? lock_downgrade+0x900/0x900 [ 45.038391] ? ext4_ioctl+0x2316/0x4210 [ 45.042354] iput+0x674/0xa90 [ 45.045449] ? inode_add_lru+0x2a0/0x2a0 [ 45.049508] ? up_write+0x7b/0x220 [ 45.053030] ? down_write_nested+0x130/0x130 [ 45.057430] ? down_write_nested+0x130/0x130 [ 45.061824] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.067378] ? check_preemption_disabled+0x48/0x200 [ 45.072380] ext4_ioctl+0x236a/0x4210 [ 45.076168] ? is_bpf_text_address+0xac/0x170 [ 45.080657] ? ext4_ioctl_group_add+0x560/0x560 [ 45.085319] ? rcu_read_unlock_special+0x1c0/0x1c0 [ 45.090261] ? kasan_check_read+0x11/0x20 [ 45.094412] ? rcu_dynticks_curr_cpu_in_eqs+0xa2/0x170 [ 45.099697] ? rcu_softirq_qs+0x20/0x20 [ 45.103653] ? unwind_dump+0x190/0x190 [ 45.107536] ? is_bpf_text_address+0xd3/0x170 [ 45.112018] ? kernel_text_address+0x79/0xf0 [ 45.116411] ? __kernel_text_address+0xd/0x40 [ 45.120912] ? unwind_get_return_address+0x61/0xa0 [ 45.125836] ? __save_stack_trace+0x8d/0xf0 [ 45.130161] ? save_stack+0xa9/0xd0 [ 45.133780] ? save_stack+0x43/0xd0 [ 45.137389] ? __kasan_slab_free+0x102/0x150 [ 45.141801] ? kasan_slab_free+0xe/0x10 [ 45.145809] ? kmem_cache_free+0x83/0x290 [ 45.149946] ? putname+0xf2/0x130 [ 45.153396] ? do_sys_open+0x54d/0x700 [ 45.157264] ? __x64_sys_openat+0x9d/0x100 [ 45.161484] ? do_syscall_64+0x1b9/0x820 [ 45.165529] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.170897] ? trace_hardirqs_off+0xb8/0x310 [ 45.175285] ? kasan_check_read+0x11/0x20 [ 45.179415] ? do_raw_spin_unlock+0xa7/0x2f0 [ 45.183807] ? trace_hardirqs_on+0x310/0x310 [ 45.188202] ? kasan_check_write+0x14/0x20 [ 45.192445] ? trace_hardirqs_off+0xb8/0x310 [ 45.196839] ? trace_hardirqs_on+0x310/0x310 [ 45.201229] ? ext4_ioctl_group_add+0x560/0x560 [ 45.205882] do_vfs_ioctl+0x1de/0x1720 [ 45.209751] ? trace_hardirqs_on+0xbd/0x310 [ 45.214050] ? ioctl_preallocate+0x300/0x300 [ 45.218467] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.223987] ? __fget_light+0x2e9/0x430 [ 45.227943] ? fget_raw+0x20/0x20 [ 45.231392] ? putname+0xf2/0x130 [ 45.234827] ? kmem_cache_free+0x21a/0x290 [ 45.239045] ? putname+0xf7/0x130 [ 45.242503] ? security_file_ioctl+0x94/0xc0 [ 45.246893] ksys_ioctl+0xa9/0xd0 [ 45.250353] __x64_sys_ioctl+0x73/0xb0 [ 45.254223] do_syscall_64+0x1b9/0x820 [ 45.258097] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 45.263451] ? syscall_return_slowpath+0x5e0/0x5e0 [ 45.268365] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.273191] ? trace_hardirqs_on_caller+0x310/0x310 [ 45.278188] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 45.283184] ? prepare_exit_to_usermode+0x291/0x3b0 [ 45.288197] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.293052] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.298231] RIP: 0033:0x440029 [ 45.301406] 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 [ 45.320289] RSP: 002b:00007ffe7094d328 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 45.327980] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 45.335232] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000003 [ 45.342481] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 45.349753] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018b0 [ 45.357006] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 45.364259] Modules linked in: [ 45.367569] ---[ end trace cac82bf63c5440c7 ]--- [ 45.372348] RIP: 0010:rb_erase+0x306/0x3710 [ 45.376702] 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 [ 45.395630] RSP: 0018:ffff8801bc386918 EFLAGS: 00010202 [ 45.400979] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 45.408276] RDX: 1ffff10037870d2b RSI: ffffffff8b5563c0 RDI: 0000000000000008 [ 45.415561] RBP: ffff8801bc387320 R08: dffffc0000000000 R09: fffffbfff135db68 [ 45.422816] R10: fffffbfff135db68 R11: ffffffff89aedb43 R12: ffff8801c506d270 [ 45.430105] R13: dffffc0000000000 R14: ffff8801bc3872f8 R15: ffff8801bc387438 [ 45.437411] FS: 000000000179f880(0000) GS:ffff8801dac00000(0000) knlGS:0000000000000000 [ 45.445655] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 45.451538] CR2: 0000000020000000 CR3: 00000001d7beb000 CR4: 00000000001406f0 [ 45.458825] Kernel panic - not syncing: Fatal exception [ 45.465193] Kernel Offset: disabled [ 45.468822] Rebooting in 86400 seconds..