[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.688984] audit: type=1800 audit(1539263083.882:25): pid=5670 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 36.715724] audit: type=1800 audit(1539263083.882:26): pid=5670 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 36.739858] audit: type=1800 audit(1539263083.882:27): pid=5670 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 '10.128.0.84' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 47.124966] kasan: CONFIG_KASAN_INLINE enabled [ 47.129588] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 47.137005] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 47.143245] CPU: 0 PID: 5823 Comm: syz-executor200 Not tainted 4.19.0-rc7+ #278 [ 47.150720] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.160074] RIP: 0010:rb_erase+0x306/0x3710 [ 47.164380] 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 [ 47.183269] RSP: 0018:ffff8801c526e918 EFLAGS: 00010202 [ 47.188617] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 47.195871] RDX: 1ffff10038a4dd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 47.203126] RBP: ffff8801c526f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 47.210382] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801c3802670 [ 47.217635] R13: dffffc0000000000 R14: ffff8801c526f2f8 R15: ffff8801c526f438 [ 47.224895] FS: 00000000009c9880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 47.233107] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 47.238972] CR2: 0000000020000700 CR3: 00000001d7b6b000 CR4: 00000000001406f0 [ 47.246269] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 47.253525] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 47.260798] Call Trace: [ 47.263383] ? rb_insert_color+0x1460/0x1460 [ 47.267790] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 47.272724] ? lock_downgrade+0x900/0x900 [ 47.276868] ? mark_held_locks+0x130/0x130 [ 47.281261] ? kasan_check_read+0x11/0x20 [ 47.285407] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 47.290671] ? rcu_bh_qs+0xc0/0xc0 [ 47.294198] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 47.299723] ? mark_held_locks+0x130/0x130 [ 47.304001] ? mark_page_accessed+0xcb0/0x2040 [ 47.308570] ? activate_page+0x1040/0x1040 [ 47.312800] ? activate_page+0x1040/0x1040 [ 47.317021] ? mark_held_locks+0x130/0x130 [ 47.321236] ? kasan_kmalloc+0xc7/0xe0 [ 47.325112] ? kmem_cache_alloc_trace+0x152/0x750 [ 47.329942] ? ima_add_digest_entry+0xcb/0x6a0 [ 47.334523] ? pagecache_get_page+0x2d8/0xf00 [ 47.339024] ? find_get_pages_contig+0x15b0/0x15b0 [ 47.343954] ? is_bpf_text_address+0xac/0x170 [ 47.348450] ? lock_downgrade+0x900/0x900 [ 47.352580] ? mark_held_locks+0x130/0x130 [ 47.356807] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 47.362600] ? mark_held_locks+0x130/0x130 [ 47.366835] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 47.372272] ? lock_downgrade+0x900/0x900 [ 47.376413] ? kasan_check_read+0x11/0x20 [ 47.380545] ? do_raw_spin_unlock+0xa7/0x2f0 [ 47.384947] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 47.389516] ? mark_held_locks+0x130/0x130 [ 47.393736] ? _raw_spin_unlock+0x2c/0x50 [ 47.397870] ? ext4_discard_preallocations+0x18a/0x13c0 [ 47.403222] ? trace_hardirqs_on+0xbd/0x310 [ 47.407530] ? ext4_exit_mballoc+0xc0/0xc0 [ 47.411746] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 47.416755] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 47.421499] ? modules_open+0xa0/0xa0 [ 47.425285] ? __es_tree_search.isra.12+0x1ba/0x220 [ 47.430282] ? __es_remove_extent+0x9a3/0xba0 [ 47.434776] ? mark_held_locks+0x130/0x130 [ 47.438995] ? lock_downgrade+0x900/0x900 [ 47.443128] ? ext4_es_scan+0x960/0x960 [ 47.447084] ? lock_release+0x970/0x970 [ 47.451146] ? trace_hardirqs_on+0xbd/0x310 [ 47.455456] ? kasan_check_read+0x11/0x20 [ 47.459588] ? clear_inode+0x114/0x3a0 [ 47.463463] ? do_raw_write_trylock+0x1c0/0x1c0 [ 47.468113] ? kasan_check_write+0x14/0x20 [ 47.472330] ? lock_acquire+0x1ed/0x520 [ 47.476290] ? integrity_inode_free+0x77/0x320 [ 47.480857] ? ext4_es_remove_extent+0x151/0x500 [ 47.485605] ? lock_release+0x970/0x970 [ 47.489562] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 47.494651] ? depot_save_stack+0x292/0x470 [ 47.498960] ? kasan_check_write+0x14/0x20 [ 47.503179] ? do_raw_write_lock+0xbd/0x1b0 [ 47.507483] integrity_inode_free+0x12f/0x320 [ 47.511972] security_inode_free+0x19/0x90 [ 47.516194] __destroy_inode+0x328/0x820 [ 47.520235] ? generic_update_time+0x450/0x450 [ 47.524800] ? evict+0x5d8/0x980 [ 47.528148] ? lock_downgrade+0x900/0x900 [ 47.532285] ? __inode_wait_for_writeback+0x2cf/0x380 [ 47.537467] destroy_inode+0xda/0x200 [ 47.541260] ? __destroy_inode+0x820/0x820 [ 47.545500] ? kasan_check_write+0x14/0x20 [ 47.549721] ? do_raw_spin_lock+0xc1/0x200 [ 47.553941] evict+0x5e0/0x980 [ 47.557116] ? jbd2_journal_stop+0x430/0x15d0 [ 47.561592] ? destroy_inode+0x200/0x200 [ 47.565640] ? do_raw_spin_lock+0xc1/0x200 [ 47.569857] ? iput+0x671/0xa90 [ 47.573121] ? lock_downgrade+0x900/0x900 [ 47.577251] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 47.582785] ? kasan_check_read+0x11/0x20 [ 47.586924] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 47.591493] ? lock_downgrade+0x900/0x900 [ 47.595627] ? ext4_ioctl+0x231b/0x4210 [ 47.599586] iput+0x679/0xa90 [ 47.602695] ? inode_add_lru+0x2a0/0x2a0 [ 47.606814] ? up_write+0x7b/0x220 [ 47.610347] ? up_read+0x110/0x110 [ 47.613876] ? up_read+0x110/0x110 [ 47.617403] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.622936] ? check_preemption_disabled+0x48/0x200 [ 47.627940] ext4_ioctl+0x236f/0x4210 [ 47.631726] ? ext4_ioctl_group_add+0x560/0x560 [ 47.636381] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 47.642161] ? kasan_check_read+0x11/0x20 [ 47.646302] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 47.651569] ? rcu_bh_qs+0xc0/0xc0 [ 47.655097] ? unwind_dump+0x190/0x190 [ 47.658981] ? is_bpf_text_address+0xd3/0x170 [ 47.663469] ? kernel_text_address+0x79/0xf0 [ 47.667935] ? __kernel_text_address+0xd/0x40 [ 47.672432] ? unwind_get_return_address+0x61/0xa0 [ 47.677360] ? __save_stack_trace+0x8d/0xf0 [ 47.681676] ? save_stack+0xa9/0xd0 [ 47.685285] ? save_stack+0x43/0xd0 [ 47.688906] ? __kasan_slab_free+0x102/0x150 [ 47.693301] ? kasan_slab_free+0xe/0x10 [ 47.697261] ? kmem_cache_free+0x83/0x290 [ 47.701392] ? putname+0xf2/0x130 [ 47.704832] ? do_sys_open+0x54d/0x700 [ 47.708709] ? __x64_sys_open+0x7e/0xc0 [ 47.712674] ? do_syscall_64+0x1b9/0x820 [ 47.716725] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.722084] ? trace_hardirqs_off+0xb8/0x310 [ 47.726523] ? kasan_check_read+0x11/0x20 [ 47.730664] ? do_raw_spin_unlock+0xa7/0x2f0 [ 47.735065] ? trace_hardirqs_on+0x310/0x310 [ 47.739465] ? kasan_check_write+0x14/0x20 [ 47.743689] ? trace_hardirqs_off+0xb8/0x310 [ 47.748086] ? ext4_ioctl_group_add+0x560/0x560 [ 47.752750] do_vfs_ioctl+0x1de/0x1720 [ 47.756636] ? trace_hardirqs_on+0xbd/0x310 [ 47.760943] ? ioctl_preallocate+0x300/0x300 [ 47.765337] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.770855] ? __fget_light+0x2e9/0x430 [ 47.774818] ? fget_raw+0x20/0x20 [ 47.778260] ? putname+0xf2/0x130 [ 47.781704] ? kmem_cache_free+0x21a/0x290 [ 47.785930] ? putname+0xf7/0x130 [ 47.789374] ? do_sys_open+0x3ac/0x700 [ 47.793330] ? security_file_ioctl+0x94/0xc0 [ 47.797738] ksys_ioctl+0xa9/0xd0 [ 47.801183] __x64_sys_ioctl+0x73/0xb0 [ 47.805171] do_syscall_64+0x1b9/0x820 [ 47.809044] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 47.814391] ? syscall_return_slowpath+0x5e0/0x5e0 [ 47.819303] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.824132] ? trace_hardirqs_on_caller+0x310/0x310 [ 47.829249] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 47.834251] ? prepare_exit_to_usermode+0x291/0x3b0 [ 47.839251] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.844090] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 47.849282] RIP: 0033:0x440029 [ 47.852466] 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 [ 47.871820] RSP: 002b:00007ffe2c1c49e8 EFLAGS: 00000217 ORIG_RAX: 0000000000000010 [ 47.879517] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 47.886778] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000004 [ 47.894034] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 47.901289] R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004018b0 [ 47.908542] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 47.915795] Modules linked in: [ 47.919099] ---[ end trace fa74485659ef3285 ]--- [ 47.924013] RIP: 0010:rb_erase+0x306/0x3710 [ 47.928335] 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 [ 47.947507] RSP: 0018:ffff8801c526e918 EFLAGS: 00010202 [ 47.952891] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 47.960145] RDX: 1ffff10038a4dd2b RSI: ffffffff8afbc8a0 RDI: 0000000000000008 [ 47.967447] RBP: ffff8801c526f320 R08: dffffc0000000000 R09: fffffbfff12d69b0 [ 47.974851] R10: fffffbfff12d69b0 R11: ffffffff896b4d83 R12: ffff8801c3802670 [ 47.982153] R13: dffffc0000000000 R14: ffff8801c526f2f8 R15: ffff8801c526f438 [ 47.989485] FS: 00000000009c9880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 47.997730] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.003633] CR2: 0000000020000700 CR3: 00000001d7b6b000 CR4: 00000000001406f0 [ 48.010908] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.018208] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.025494] Kernel panic - not syncing: Fatal exception [ 48.031845] Kernel Offset: disabled [ 48.035471] Rebooting in 86400 seconds..