[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 32.741271] audit: type=1800 audit(1539252442.646:25): pid=5626 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 32.766810] audit: type=1800 audit(1539252442.646:26): pid=5626 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 32.800135] audit: type=1800 audit(1539252442.646:27): pid=5626 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 '10.128.0.108' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 44.071037] kasan: CONFIG_KASAN_INLINE enabled [ 44.075752] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 44.083132] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 44.089374] CPU: 1 PID: 5780 Comm: syz-executor114 Not tainted 4.19.0-rc6+ #254 [ 44.096983] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.106469] RIP: 0010:rb_erase+0x306/0x3710 [ 44.110777] 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 [ 44.130001] RSP: 0018:ffff8801d86e6918 EFLAGS: 00010202 [ 44.135358] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 44.142608] RDX: 1ffff1003b0dcd2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 44.149964] RBP: ffff8801d86e7320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 44.157247] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801c4004330 [ 44.164627] R13: dffffc0000000000 R14: ffff8801d86e72f8 R15: ffff8801d86e7438 [ 44.171883] FS: 000000000128c880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 44.180242] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.186114] CR2: 0000000020000080 CR3: 00000001d812c000 CR4: 00000000001406e0 [ 44.193374] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 44.200638] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 44.208044] Call Trace: [ 44.210635] ? rb_insert_color+0x1460/0x1460 [ 44.215041] ? add_to_page_cache_lru+0x10b0/0x10b0 [ 44.219963] ? lock_downgrade+0x900/0x900 [ 44.224123] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 44.229913] ? mark_held_locks+0x130/0x130 [ 44.234137] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 44.239400] ? rcu_bh_qs+0xc0/0xc0 [ 44.242923] ? unwind_dump+0x190/0x190 [ 44.246859] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 44.252395] ? mark_held_locks+0x130/0x130 [ 44.256619] ? mark_page_accessed+0xcb0/0x2040 [ 44.261276] ? activate_page+0x1040/0x1040 [ 44.265512] ? activate_page+0x1040/0x1040 [ 44.269740] ? mark_held_locks+0x130/0x130 [ 44.273969] ? kasan_kmalloc+0xc7/0xe0 [ 44.277838] ? kmem_cache_alloc_trace+0x152/0x750 [ 44.282670] ? ima_add_digest_entry+0xcb/0x6a0 [ 44.287235] ? ima_add_template_entry+0x466/0x7f0 [ 44.292058] ? ima_store_template+0x224/0x310 [ 44.296541] ? pagecache_get_page+0x2d8/0xf00 [ 44.301020] ? find_get_pages_contig+0x15b0/0x15b0 [ 44.305932] ? is_bpf_text_address+0xac/0x170 [ 44.310408] ? lock_downgrade+0x900/0x900 [ 44.314536] ? mark_held_locks+0x130/0x130 [ 44.318751] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 44.324529] ? mark_held_locks+0x130/0x130 [ 44.328748] ? ext4_discard_preallocations+0x9b9/0x13c0 [ 44.334112] ? lock_downgrade+0x900/0x900 [ 44.338249] ? kasan_check_read+0x11/0x20 [ 44.342378] ? do_raw_spin_unlock+0xa7/0x2f0 [ 44.346773] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 44.351337] ? mark_held_locks+0x130/0x130 [ 44.355553] ? _raw_spin_unlock+0x2c/0x50 [ 44.359681] ? ext4_discard_preallocations+0x18a/0x13c0 [ 44.365172] ? trace_hardirqs_on+0xbd/0x310 [ 44.369480] ? ext4_exit_mballoc+0xc0/0xc0 [ 44.373703] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 44.378709] ? bpf_prog_kallsyms_find+0xde/0x4a0 [ 44.383451] ? modules_open+0xa0/0xa0 [ 44.387235] ? __es_tree_search.isra.12+0x1ba/0x220 [ 44.392234] ? __es_remove_extent+0x9a3/0xba0 [ 44.396889] ? mark_held_locks+0x130/0x130 [ 44.401112] ? lock_downgrade+0x900/0x900 [ 44.405267] ? ext4_es_scan+0x960/0x960 [ 44.409221] ? lock_release+0x970/0x970 [ 44.413288] ? trace_hardirqs_on+0xbd/0x310 [ 44.417594] ? kasan_check_read+0x11/0x20 [ 44.421726] ? clear_inode+0x114/0x3a0 [ 44.425611] ? do_raw_write_trylock+0x1c0/0x1c0 [ 44.430271] ? kasan_check_write+0x14/0x20 [ 44.434497] ? lock_acquire+0x1ed/0x520 [ 44.438456] ? integrity_inode_free+0x77/0x320 [ 44.443025] ? ext4_es_remove_extent+0x151/0x500 [ 44.447764] ? lock_release+0x970/0x970 [ 44.451724] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 44.456813] ? depot_save_stack+0x292/0x470 [ 44.461120] ? kasan_check_write+0x14/0x20 [ 44.465336] ? do_raw_write_lock+0xbd/0x1b0 [ 44.469652] integrity_inode_free+0x12f/0x320 [ 44.474142] security_inode_free+0x19/0x90 [ 44.478367] __destroy_inode+0x328/0x820 [ 44.482412] ? generic_update_time+0x450/0x450 [ 44.486979] ? evict+0x5d8/0x980 [ 44.490326] ? lock_downgrade+0x900/0x900 [ 44.494457] ? __inode_wait_for_writeback+0x2cf/0x380 [ 44.499642] destroy_inode+0xda/0x200 [ 44.503423] ? __destroy_inode+0x820/0x820 [ 44.507821] ? kasan_check_write+0x14/0x20 [ 44.512038] ? do_raw_spin_lock+0xc1/0x200 [ 44.516263] evict+0x5e0/0x980 [ 44.519439] ? jbd2_journal_stop+0x430/0x15d0 [ 44.523915] ? destroy_inode+0x200/0x200 [ 44.527957] ? do_raw_spin_lock+0xc1/0x200 [ 44.532169] ? iput+0x671/0xa90 [ 44.535428] ? lock_downgrade+0x900/0x900 [ 44.539557] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 44.545079] ? kasan_check_read+0x11/0x20 [ 44.549209] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 44.553966] ? lock_downgrade+0x900/0x900 [ 44.558303] ? ext4_ioctl+0x231b/0x4210 [ 44.562271] iput+0x679/0xa90 [ 44.565364] ? inode_add_lru+0x2a0/0x2a0 [ 44.569413] ? up_write+0x7b/0x220 [ 44.572940] ? up_read+0x110/0x110 [ 44.576469] ? up_read+0x110/0x110 [ 44.579994] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.585518] ? check_preemption_disabled+0x48/0x200 [ 44.590518] ext4_ioctl+0x236f/0x4210 [ 44.594300] ? is_bpf_text_address+0xac/0x170 [ 44.598775] ? ext4_ioctl_group_add+0x560/0x560 [ 44.603429] ? rcu_read_unlock_special.part.39+0x11f0/0x11f0 [ 44.609204] ? kasan_check_read+0x11/0x20 [ 44.613332] ? rcu_dynticks_curr_cpu_in_eqs+0x9f/0x160 [ 44.618586] ? rcu_bh_qs+0xc0/0xc0 [ 44.622112] ? unwind_dump+0x190/0x190 [ 44.625981] ? is_bpf_text_address+0xd3/0x170 [ 44.630456] ? kernel_text_address+0x79/0xf0 [ 44.634847] ? __kernel_text_address+0xd/0x40 [ 44.639789] ? unwind_get_return_address+0x61/0xa0 [ 44.644704] ? __save_stack_trace+0x8d/0xf0 [ 44.649007] ? save_stack+0xa9/0xd0 [ 44.652633] ? save_stack+0x43/0xd0 [ 44.656238] ? __kasan_slab_free+0x102/0x150 [ 44.660626] ? kasan_slab_free+0xe/0x10 [ 44.664577] ? kmem_cache_free+0x83/0x290 [ 44.668705] ? putname+0xf2/0x130 [ 44.672141] ? do_sys_open+0x54d/0x700 [ 44.676007] ? __x64_sys_openat+0x9d/0x100 [ 44.680686] ? do_syscall_64+0x1b9/0x820 [ 44.684737] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 44.690108] ? trace_hardirqs_off+0xb8/0x310 [ 44.694503] ? kasan_check_read+0x11/0x20 [ 44.698631] ? do_raw_spin_unlock+0xa7/0x2f0 [ 44.703033] ? trace_hardirqs_on+0x310/0x310 [ 44.707428] ? kasan_check_write+0x14/0x20 [ 44.711650] ? trace_hardirqs_off+0xb8/0x310 [ 44.716042] ? trace_hardirqs_on+0x310/0x310 [ 44.720429] ? ext4_ioctl_group_add+0x560/0x560 [ 44.725081] do_vfs_ioctl+0x1de/0x1720 [ 44.728948] ? trace_hardirqs_on+0xbd/0x310 [ 44.733248] ? ioctl_preallocate+0x300/0x300 [ 44.737784] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.743309] ? __fget_light+0x2e9/0x430 [ 44.747358] ? fget_raw+0x20/0x20 [ 44.750800] ? putname+0xf2/0x130 [ 44.754238] ? kmem_cache_free+0x21a/0x290 [ 44.758454] ? putname+0xf7/0x130 [ 44.761892] ? security_file_ioctl+0x94/0xc0 [ 44.766389] ksys_ioctl+0xa9/0xd0 [ 44.769831] __x64_sys_ioctl+0x73/0xb0 [ 44.773707] do_syscall_64+0x1b9/0x820 [ 44.777584] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 44.782933] ? syscall_return_slowpath+0x5e0/0x5e0 [ 44.787841] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 44.792673] ? trace_hardirqs_on_caller+0x310/0x310 [ 44.797676] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 44.802679] ? prepare_exit_to_usermode+0x291/0x3b0 [ 44.807680] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 44.812505] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 44.817672] RIP: 0033:0x440089 [ 44.820849] 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 [ 44.839832] RSP: 002b:00007ffec08111f8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 44.847538] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440089 [ 44.854878] RDX: 0000000000440089 RSI: 0000000000006611 RDI: 0000000000000003 [ 44.862191] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 44.869454] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000401910 [ 44.876706] R13: 00000000004019a0 R14: 0000000000000000 R15: 0000000000000000 [ 44.883960] Modules linked in: [ 44.887262] ---[ end trace fa31dcde5d49505a ]--- [ 44.892046] RIP: 0010:rb_erase+0x306/0x3710 [ 44.896363] 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 [ 44.915302] RSP: 0018:ffff8801d86e6918 EFLAGS: 00010202 [ 44.920682] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 [ 44.927936] RDX: 1ffff1003b0dcd2b RSI: ffffffff8afc38a0 RDI: 0000000000000008 [ 44.935332] RBP: ffff8801d86e7320 R08: dffffc0000000000 R09: fffffbfff12d6a70 [ 44.942615] R10: fffffbfff12d6a70 R11: ffffffff896b5383 R12: ffff8801c4004330 [ 44.949866] R13: dffffc0000000000 R14: ffff8801d86e72f8 R15: ffff8801d86e7438 [ 44.957172] FS: 000000000128c880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 44.965411] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.971302] CR2: 0000000020000080 CR3: 00000001d812c000 CR4: 00000000001406e0 [ 44.978579] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 44.985862] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 44.993143] Kernel panic - not syncing: Fatal exception [ 44.999795] Kernel Offset: disabled [ 45.003421] Rebooting in 86400 seconds..