[....] Starting enhanced syslogd: rsyslogd[ 12.895855] audit: type=1400 audit(1514590451.115:4): avc: denied { syslog } for pid=3172 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?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 '10.128.0.11' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 64.405742] IPVS: Creating netns size=2536 id=1 executing program [ 64.426732] IPVS: Creating netns size=2536 id=2 executing program [ 64.457500] IPVS: Creating netns size=2536 id=3 executing program [ 64.480459] IPVS: Creating netns size=2536 id=4 executing program [ 64.505689] IPVS: Creating netns size=2536 id=5 executing program executing program [ 64.533868] IPVS: Creating netns size=2536 id=6 executing program executing program executing program [ 64.568662] IPVS: Creating netns size=2536 id=7 executing program executing program [ 64.596775] IPVS: Creating netns size=2536 id=8 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 83.196092] ================================================================== [ 83.203513] BUG: KASAN: use-after-free in disk_unblock_events+0x51/0x60 [ 83.210249] Read of size 8 at addr ffff8801cd94afe0 by task blkid/13888 [ 83.216980] [ 83.218594] CPU: 0 PID: 13888 Comm: blkid Not tainted 4.9.73-gf3f3457 #11 [ 83.225502] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.234837] ffff8801c2307790 ffffffff81d922b9 ffffea0007365200 ffff8801cd94afe0 [ 83.242843] 0000000000000000 ffff8801cd94afe0 0000000000000000 ffff8801c23077c8 [ 83.250854] ffffffff8153bab3 ffff8801cd94afe0 0000000000000008 0000000000000000 [ 83.258868] Call Trace: [ 83.261440] [] dump_stack+0xc1/0x128 [ 83.266790] [] print_address_description+0x73/0x280 [ 83.273445] [] kasan_report+0x275/0x360 [ 83.279064] [] ? disk_unblock_events+0x51/0x60 [ 83.285292] [] __asan_report_load8_noabort+0x14/0x20 executing program [ 83.292032] [] disk_unblock_events+0x51/0x60 [ 83.298086] [] __blkdev_get+0x4b5/0xd50 [ 83.303697] [] ? __blkdev_put+0x7e0/0x7e0 [ 83.309509] [] blkdev_get+0x33b/0x960 [ 83.314941] [] ? bd_link_disk_holder+0x6c0/0x6c0 [ 83.321334] [] ? bd_acquire+0x27/0x250 [ 83.326857] [] ? bd_acquire+0x88/0x250 [ 83.332395] [] ? _raw_spin_unlock+0x2c/0x50 [ 83.338359] [] blkdev_open+0x1a5/0x250 executing program [ 83.343882] [] do_dentry_open+0x607/0xc60 [ 83.349671] [] ? blkdev_get_by_dev+0x60/0x60 [ 83.355714] [] vfs_open+0x105/0x220 [ 83.360960] [] ? may_open+0x231/0x2e0 [ 83.366376] [] path_openat+0x5ac/0x2910 [ 83.371967] [] ? path_lookupat+0x3f0/0x3f0 [ 83.377819] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 83.384815] [] ? __lock_is_held+0xa1/0xf0 [ 83.390606] [] do_filp_open+0x197/0x290 executing program [ 83.396226] [] ? may_open_dev+0xe0/0xe0 [ 83.401842] [] ? _raw_spin_unlock+0x2c/0x50 [ 83.407801] [] ? __alloc_fd+0x1d7/0x510 [ 83.413412] [] do_sys_open+0x352/0x4c0 [ 83.418940] [] ? filp_open+0x70/0x70 [ 83.424303] [] ? entry_SYSCALL_64_fastpath+0x5/0xc6 [ 83.430965] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 83.437794] [] SyS_open+0x2d/0x40 executing program executing program [ 83.442886] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 83.449444] [ 83.451052] Allocated by task 13841: [ 83.454751] save_stack_trace+0x16/0x20 [ 83.458714] save_stack+0x43/0xd0 [ 83.462153] kasan_kmalloc+0xad/0xe0 [ 83.465854] kmem_cache_alloc_trace+0xfb/0x2a0 [ 83.470421] alloc_disk_node+0x54/0x3b0 [ 83.474383] alloc_disk+0x18/0x20 [ 83.477829] loop_add+0x324/0x770 [ 83.481268] loop_probe+0x155/0x180 [ 83.484880] kobj_lookup+0x2ac/0x410 [ 83.488579] get_gendisk+0x37/0x2d0 [ 83.492199] __blkdev_get+0x34f/0xd50 executing program [ 83.495990] blkdev_get+0x4bf/0x960 [ 83.499598] blkdev_open+0x1a5/0x250 [ 83.503295] do_dentry_open+0x607/0xc60 [ 83.507250] vfs_open+0x105/0x220 [ 83.510689] path_openat+0x5ac/0x2910 [ 83.514477] do_filp_open+0x197/0x290 [ 83.518262] do_sys_open+0x352/0x4c0 [ 83.521957] compat_SyS_open+0x2a/0x40 [ 83.525830] do_fast_syscall_32+0x2f7/0x890 [ 83.530142] entry_SYSENTER_compat+0x51/0x60 [ 83.534527] [ 83.536134] Freed by task 13888: [ 83.539487] save_stack_trace+0x16/0x20 [ 83.543443] save_stack+0x43/0xd0 executing program executing program [ 83.546885] kasan_slab_free+0x72/0xc0 [ 83.550758] kfree+0x103/0x300 [ 83.553935] disk_release+0x259/0x330 [ 83.557721] device_release+0x7c/0x210 [ 83.561592] kobject_release+0xed/0x1a0 [ 83.565550] kobject_put+0x63/0xc0 [ 83.569075] put_disk+0x23/0x30 [ 83.572340] __blkdev_get+0x415/0xd50 [ 83.576130] blkdev_get+0x33b/0x960 [ 83.579746] blkdev_open+0x1a5/0x250 [ 83.583443] do_dentry_open+0x607/0xc60 [ 83.587402] vfs_open+0x105/0x220 [ 83.590839] path_openat+0x5ac/0x2910 executing program [ 83.594624] do_filp_open+0x197/0x290 [ 83.598408] do_sys_open+0x352/0x4c0 [ 83.602103] SyS_open+0x2d/0x40 [ 83.605368] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 83.610100] [ 83.611710] The buggy address belongs to the object at ffff8801cd94aa80 [ 83.611710] which belongs to the cache kmalloc-2048 of size 2048 [ 83.624524] The buggy address is located 1376 bytes inside of [ 83.624524] 2048-byte region [ffff8801cd94aa80, ffff8801cd94b280) [ 83.636557] The buggy address belongs to the page: executing program executing program executing program executing program executing program executing program executing program [ 83.641489] page:ffffea0007365200 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 [ 83.641492] flags: 0x8000000000004080(slab|head) executing program [ 83.641499] page dumped because: kasan: bad access detected [ 83.641500] [ 83.641502] Memory state around the buggy address: executing program executing program [ 83.641507] ffff8801cd94ae80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program executing program executing program executing program [ 83.641511] ffff8801cd94af00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 83.641514] >ffff8801cd94af80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 83.641517] ^ [ 83.641520] ffff8801cd94b000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 83.641524] ffff8801cd94b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 83.641525] ================================================================== [ 83.641527] Disabling lock debugging due to kernel taint [ 83.809751] Kernel panic - not syncing: panic_on_warn set ... [ 83.809751] [ 83.809760] CPU: 0 PID: 13888 Comm: blkid Tainted: G B 4.9.73-gf3f3457 #11 [ 83.809763] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.809774] ffff8801c23076e8 ffffffff81d922b9 ffffffff841955bf ffff8801c23077c0 [ 83.809782] 0000000000000000 ffff8801cd94afe0 0000000000000000 ffff8801c23077b0 [ 83.809790] ffffffff8142d741 0000000041b58ab3 ffffffff84189000 ffffffff8142d585 [ 83.809792] Call Trace: [ 83.809805] [] dump_stack+0xc1/0x128 [ 83.809813] [] panic+0x1bc/0x3a8 [ 83.809821] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 83.809829] [] ? preempt_schedule+0x25/0x30 [ 83.809836] [] ? ___preempt_schedule+0x16/0x18 [ 83.809844] [] kasan_end_report+0x50/0x50 [ 83.809851] [] kasan_report+0x167/0x360 [ 83.809859] [] ? disk_unblock_events+0x51/0x60 [ 83.809866] [] __asan_report_load8_noabort+0x14/0x20 [ 83.809872] [] disk_unblock_events+0x51/0x60 [ 83.809880] [] __blkdev_get+0x4b5/0xd50 [ 83.809887] [] ? __blkdev_put+0x7e0/0x7e0 [ 83.809894] [] blkdev_get+0x33b/0x960 [ 83.809900] [] ? bd_link_disk_holder+0x6c0/0x6c0 [ 83.809907] [] ? bd_acquire+0x27/0x250 [ 83.809913] [] ? bd_acquire+0x88/0x250 [ 83.809921] [] ? _raw_spin_unlock+0x2c/0x50 [ 83.809927] [] blkdev_open+0x1a5/0x250 [ 83.809934] [] do_dentry_open+0x607/0xc60 [ 83.809940] [] ? blkdev_get_by_dev+0x60/0x60 [ 83.809950] [] vfs_open+0x105/0x220 [ 83.809957] [] ? may_open+0x231/0x2e0 [ 83.809964] [] path_openat+0x5ac/0x2910 [ 83.809971] [] ? path_lookupat+0x3f0/0x3f0 [ 83.809979] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 83.809985] [] ? __lock_is_held+0xa1/0xf0 [ 83.809991] [] do_filp_open+0x197/0x290 [ 83.809997] [] ? may_open_dev+0xe0/0xe0 [ 83.810004] [] ? _raw_spin_unlock+0x2c/0x50 [ 83.810010] [] ? __alloc_fd+0x1d7/0x510 [ 83.810016] [] do_sys_open+0x352/0x4c0 [ 83.810022] [] ? filp_open+0x70/0x70 [ 83.810028] [] ? entry_SYSCALL_64_fastpath+0x5/0xc6 [ 83.810035] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 83.810041] [] SyS_open+0x2d/0x40 [ 83.810047] [] entry_SYSCALL_64_fastpath+0x23/0xc6 [ 83.812849] Dumping ftrace buffer: [ 83.812852] (ftrace buffer empty) [ 83.812854] Kernel Offset: disabled [ 84.118972] Rebooting in 86400 seconds..