[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 32.076067] audit: type=1800 audit(1539263840.021:25): pid=5635 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 32.102539] audit: type=1800 audit(1539263840.021:26): pid=5635 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 32.128753] audit: type=1800 audit(1539263840.021:27): pid=5635 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 '10.128.0.15' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 40.061512] kasan: CONFIG_KASAN_INLINE enabled [ 40.066152] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 40.073575] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 40.079818] CPU: 0 PID: 5788 Comm: syz-executor381 Not tainted 4.19.0-rc6+ #255 [ 40.087289] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.096664] RIP: 0010:rb_erase+0x306/0x3710 [ 40.100980] 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 [ 40.119875] RSP: 0018:ffff8801bbdc6918 EFLAGS: 00010202 [ 40.125238] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 40.132495] RDX: 1ffff100377b8d2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 40.139746] RBP: ffff8801bbdc7320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 40.147015] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801b8e357b0 [ 40.154282] R13: dffffc0000000000 R14: ffff8801bbdc72f8 R15: ffff8801bbdc7438 [ 40.161551] FS: 000000000192e880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 40.169763] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.175627] CR2: 0000000020000000 CR3: 00000001d7dab000 CR4: 00000000001406f0 [ 40.182881] Call Trace: [ 40.185459] ? rb_insert_color+0x1460/0x1460 [ 40.189857] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 40.194773] ? lock_downgrade+0x900/0x900 [ 40.198912] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 40.204695] ? mark_held_locks+0x130/0x130 [ 40.208914] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 40.214181] ? rcu_bh_qs+0xc0/0xc0 [ 40.217715] ? unwind_dump+0x190/0x190 [ 40.221588] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 40.227109] ? mark_held_locks+0x130/0x130 [ 40.231344] ? mark_page_accessed+0xcb0/0x2040 [ 40.235908] ? activate_page+0x1040/0x1040 [ 40.240127] ? activate_page+0x1040/0x1040 [ 40.244349] ? mark_held_locks+0x130/0x130 [ 40.248567] ? kasan_kmalloc+0xc7/0xe0 [ 40.252443] ? kmem_cache_alloc_trace+0x152/0x750 [ 40.257267] ? ima_add_digest_entry+0xcb/0x6a0 [ 40.261828] ? ima_add_template_entry+0x466/0x7f0 [ 40.266669] ? ima_store_template+0x224/0x310 [ 40.271153] ? pagecache_get_page+0x2d8/0xf00 [ 40.275655] ? find_get_pages_contig+0x15b0/0x15b0 [ 40.280574] ? is_bpf_text_address+0xac/0x170 [ 40.285054] ? lock_downgrade+0x900/0x900 [ 40.289191] ? mark_held_locks+0x130/0x130 [ 40.293413] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 40.299202] ? mark_held_locks+0x130/0x130 [ 40.303427] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 40.308772] ? lock_downgrade+0x900/0x900 [ 40.312904] ? kasan_check_read+0x11/0x20 [ 40.317037] ? do_raw_spin_unlock+0xa7/0x2f0 [ 40.321430] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 40.325996] ? mark_held_locks+0x130/0x130 [ 40.330216] ? _raw_spin_unlock+0x2c/0x50 [ 40.334351] ? ext4_discard_preallocations+0x18a/0x13c0 [ 40.339701] ? trace_hardirqs_on+0xbd/0x310 [ 40.344009] ? ext4_exit_mballoc+0xc0/0xc0 [ 40.348245] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 40.353246] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 40.357984] ? modules_open+0xa0/0xa0 [ 40.361767] ? __es_tree_search.isra.12+0x1ba/0x220 [ 40.366785] ? __es_remove_extent+0x9a3/0xba0 [ 40.371264] ? mark_held_locks+0x130/0x130 [ 40.375484] ? lock_downgrade+0x900/0x900 [ 40.379614] ? ext4_es_scan+0x960/0x960 [ 40.383572] ? lock_release+0x970/0x970 [ 40.387547] ? trace_hardirqs_on+0xbd/0x310 [ 40.391852] ? kasan_check_read+0x11/0x20 [ 40.395998] ? clear_inode+0x114/0x3a0 [ 40.399868] ? do_raw_write_trylock+0x1c0/0x1c0 [ 40.404532] ? kasan_check_write+0x14/0x20 [ 40.408747] ? lock_acquire+0x1ed/0x520 [ 40.412706] ? integrity_inode_free+0x77/0x320 [ 40.417285] ? ext4_es_remove_extent+0x151/0x500 [ 40.422025] ? lock_release+0x970/0x970 [ 40.425992] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 40.431078] ? depot_save_stack+0x292/0x470 [ 40.435384] ? kasan_check_write+0x14/0x20 [ 40.439600] ? do_raw_write_lock+0xbd/0x1b0 [ 40.443911] integrity_inode_free+0x12f/0x320 [ 40.448390] security_inode_free+0x19/0x90 [ 40.452609] __destroy_inode+0x328/0x820 [ 40.456650] ? generic_update_time+0x450/0x450 [ 40.461216] ? evict+0x5d8/0x980 [ 40.464567] ? lock_downgrade+0x900/0x900 [ 40.468695] ? __inode_wait_for_writeback+0x2cf/0x380 [ 40.474109] destroy_inode+0xda/0x200 [ 40.477899] ? __destroy_inode+0x820/0x820 [ 40.482119] ? kasan_check_write+0x14/0x20 [ 40.486340] ? do_raw_spin_lock+0xc1/0x200 [ 40.490573] evict+0x5e0/0x980 [ 40.493754] ? jbd2_journal_stop+0x430/0x15d0 [ 40.498233] ? destroy_inode+0x200/0x200 [ 40.502283] ? do_raw_spin_lock+0xc1/0x200 [ 40.506499] ? iput+0x671/0xa90 [ 40.509764] ? lock_downgrade+0x900/0x900 [ 40.513898] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 40.519418] ? kasan_check_read+0x11/0x20 [ 40.523551] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 40.528115] ? lock_downgrade+0x900/0x900 [ 40.532249] ? ext4_ioctl+0x231b/0x4210 [ 40.536207] iput+0x679/0xa90 [ 40.539295] ? inode_add_lru+0x2a0/0x2a0 [ 40.543337] ? up_write+0x7b/0x220 [ 40.546875] ? up_read+0x110/0x110 [ 40.550393] ? up_read+0x110/0x110 [ 40.553918] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.559439] ? check_preemption_disabled+0x48/0x200 [ 40.564441] ext4_ioctl+0x236f/0x4210 [ 40.568232] ? is_bpf_text_address+0xac/0x170 [ 40.572713] ? ext4_ioctl_group_add+0x560/0x560 [ 40.577369] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 40.583150] ? kasan_check_read+0x11/0x20 [ 40.587289] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 40.592550] ? rcu_bh_qs+0xc0/0xc0 [ 40.596073] ? unwind_dump+0x190/0x190 [ 40.599945] ? is_bpf_text_address+0xd3/0x170 [ 40.604425] ? kernel_text_address+0x79/0xf0 [ 40.608816] ? __kernel_text_address+0xd/0x40 [ 40.613297] ? unwind_get_return_address+0x61/0xa0 [ 40.618215] ? __save_stack_trace+0x8d/0xf0 [ 40.622525] ? save_stack+0xa9/0xd0 [ 40.626135] ? save_stack+0x43/0xd0 [ 40.629757] ? __kasan_slab_free+0x102/0x150 [ 40.634146] ? kasan_slab_free+0xe/0x10 [ 40.638107] ? kmem_cache_free+0x83/0x290 [ 40.642235] ? putname+0xf2/0x130 [ 40.645670] ? do_sys_open+0x54d/0x700 [ 40.649541] ? __x64_sys_openat+0x9d/0x100 [ 40.653757] ? do_syscall_64+0x1b9/0x820 [ 40.657800] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.663152] ? trace_hardirqs_off+0xb8/0x310 [ 40.667546] ? kasan_check_read+0x11/0x20 [ 40.671675] ? do_raw_spin_unlock+0xa7/0x2f0 [ 40.676068] ? trace_hardirqs_on+0x310/0x310 [ 40.680460] ? kasan_check_write+0x14/0x20 [ 40.684681] ? trace_hardirqs_off+0xb8/0x310 [ 40.689085] ? trace_hardirqs_on+0x310/0x310 [ 40.693479] ? ext4_ioctl_group_add+0x560/0x560 [ 40.698133] do_vfs_ioctl+0x1de/0x1720 [ 40.702006] ? trace_hardirqs_on+0xbd/0x310 [ 40.706310] ? ioctl_preallocate+0x300/0x300 [ 40.710704] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 40.716226] ? __fget_light+0x2e9/0x430 [ 40.720194] ? fget_raw+0x20/0x20 [ 40.723630] ? putname+0xf2/0x130 [ 40.727067] ? kmem_cache_free+0x21a/0x290 [ 40.731282] ? putname+0xf7/0x130 [ 40.734726] ? security_file_ioctl+0x94/0xc0 [ 40.739116] ksys_ioctl+0xa9/0xd0 [ 40.742556] __x64_sys_ioctl+0x73/0xb0 [ 40.746433] do_syscall_64+0x1b9/0x820 [ 40.750306] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 40.755652] ? syscall_return_slowpath+0x5e0/0x5e0 [ 40.760565] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.765394] ? trace_hardirqs_on_caller+0x310/0x310 [ 40.770391] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 40.775392] ? prepare_exit_to_usermode+0x291/0x3b0 [ 40.780389] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 40.785224] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 40.790395] RIP: 0033:0x440029 [ 40.793577] 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 [ 40.812461] RSP: 002b:00007fff83227bb8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 40.820149] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440029 [ 40.827420] RDX: 0000000000440029 RSI: 0000000000006611 RDI: 0000000000000003 [ 40.834671] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 40.841922] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004018b0 [ 40.849199] R13: 0000000000401940 R14: 0000000000000000 R15: 0000000000000000 [ 40.856467] Modules linked in: [ 40.859764] ---[ end trace bb870ed6ea9405cd ]--- [ 40.864612] RIP: 0010:rb_erase+0x306/0x3710 [ 40.868938] 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 [ 40.887957] RSP: 0018:ffff8801bbdc6918 EFLAGS: 00010202 [ 40.893401] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 40.900659] RDX: 1ffff100377b8d2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 40.907942] RBP: ffff8801bbdc7320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 40.915225] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801b8e357b0 [ 40.922512] R13: dffffc0000000000 R14: ffff8801bbdc72f8 R15: ffff8801bbdc7438 [ 40.929783] FS: 000000000192e880(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 40.938020] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.943918] CR2: 0000000020000000 CR3: 00000001d7dab000 CR4: 00000000001406f0 [ 40.951181] Kernel panic - not syncing: Fatal exception [ 40.957380] Kernel Offset: disabled [ 40.961002] Rebooting in 86400 seconds..