[....] Starting enhanced syslogd: rsyslogd[ 14.074137] audit: type=1400 audit(1517676264.476:4): avc: denied { syslog } for pid=3835 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.37' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" syzkaller login: [ 65.646794] ================================================================== [ 65.654194] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0x103/0x120 [ 65.661277] Read of size 8 at addr ffff8801d6e09140 by task syzkaller233994/4020 [ 65.668779] [ 65.670385] CPU: 1 PID: 4020 Comm: syzkaller233994 Not tainted 4.9.79-g47af77b #26 [ 65.678064] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.687401] ffff8801d7b8f9b0 ffffffff81d94b09 ffffea00075b8240 ffff8801d6e09140 [ 65.695387] 0000000000000000 ffff8801d6e09140 ffff8801d3d74438 ffff8801d7b8f9e8 [ 65.703387] ffffffff8153e083 ffff8801d6e09140 0000000000000008 0000000000000000 [ 65.711394] Call Trace: [ 65.713958] [] dump_stack+0xc1/0x128 [ 65.719314] [] print_address_description+0x73/0x280 [ 65.725948] [] kasan_report+0x275/0x360 [ 65.731542] [] ? sg_remove_request+0x103/0x120 [ 65.737742] [] __asan_report_load8_noabort+0x14/0x20 [ 65.744470] [] sg_remove_request+0x103/0x120 [ 65.750499] [] sg_finish_rem_req+0x295/0x340 [ 65.756537] [] sg_read+0xa16/0x1440 [ 65.761795] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 65.768435] [] ? fsnotify+0xf30/0xf30 [ 65.773869] [] ? avc_policy_seqno+0x9/0x20 [ 65.779736] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 65.786743] [] ? security_file_permission+0x89/0x1e0 [ 65.793467] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 65.800101] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 65.806743] [] do_readv_writev+0x520/0x750 [ 65.812606] [] ? vfs_write+0x530/0x530 [ 65.818114] [] ? __pmd_alloc+0x410/0x410 [ 65.823892] [] ? dev_seq_stop+0x50/0x50 [ 65.829491] [] ? __do_page_fault+0x5ec/0xd40 [ 65.835520] [] vfs_readv+0x84/0xc0 [ 65.840691] [] do_readv+0xe6/0x250 [ 65.845853] [] ? vfs_readv+0xc0/0xc0 [ 65.851598] [] ? entry_SYSCALL_64_fastpath+0x5/0xe8 [ 65.858254] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 65.865243] [] SyS_readv+0x27/0x30 [ 65.870412] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 65.876964] [ 65.878566] Allocated by task 0: [ 65.882605] (stack is not available) [ 65.886290] [ 65.887887] Freed by task 0: [ 65.890881] (stack is not available) [ 65.894560] [ 65.896162] The buggy address belongs to the object at ffff8801d6e09100 [ 65.896162] which belongs to the cache fasync_cache of size 96 [ 65.908821] The buggy address is located 64 bytes inside of [ 65.908821] 96-byte region [ffff8801d6e09100, ffff8801d6e09160) [ 65.920493] The buggy address belongs to the page: [ 65.925395] page:ffffea00075b8240 count:1 mapcount:0 mapping: (null) index:0x0 [ 65.933624] flags: 0x8000000000000080(slab) [ 65.937911] page dumped because: kasan: bad access detected [ 65.943586] [ 65.945185] Memory state around the buggy address: [ 65.950081] ffff8801d6e09000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 65.957412] ffff8801d6e09080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 65.964829] >ffff8801d6e09100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 65.972157] ^ [ 65.977579] ffff8801d6e09180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 65.984908] ffff8801d6e09200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc executing program [ 65.992236] ================================================================== [ 65.999569] Disabling lock debugging due to kernel taint [ 66.005377] Kernel panic - not syncing: panic_on_warn set ... [ 66.005377] [ 66.012726] CPU: 1 PID: 4020 Comm: syzkaller233994 Tainted: G B 4.9.79-g47af77b #26 [ 66.021619] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.030964] ffff8801d7b8f908 ffffffff81d94b09 ffffffff8419709f ffff8801d7b8f9e0 [ 66.038950] 0000000000000000 ffff8801d6e09140 ffff8801d3d74438 ffff8801d7b8f9d0 [ 66.046919] ffffffff8142f531 0000000041b58ab3 ffffffff8418ab10 ffffffff8142f375 [ 66.054909] Call Trace: [ 66.057474] [] dump_stack+0xc1/0x128 [ 66.062809] [] panic+0x1bc/0x3a8 [ 66.067800] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 66.076003] [] ? preempt_schedule+0x25/0x30 [ 66.081944] [] ? ___preempt_schedule+0x16/0x18 [ 66.088147] [] kasan_end_report+0x50/0x50 [ 66.093933] [] kasan_report+0x167/0x360 [ 66.099537] [] ? sg_remove_request+0x103/0x120 [ 66.105744] [] __asan_report_load8_noabort+0x14/0x20 [ 66.112478] [] sg_remove_request+0x103/0x120 [ 66.118510] [] sg_finish_rem_req+0x295/0x340 [ 66.124560] [] sg_read+0xa16/0x1440 [ 66.129840] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 66.136479] [] ? fsnotify+0xf30/0xf30 [ 66.141908] [] ? avc_policy_seqno+0x9/0x20 [ 66.147765] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 66.154760] [] ? security_file_permission+0x89/0x1e0 [ 66.161504] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 66.168141] [] ? sg_proc_seq_show_debug+0xd90/0xd90 [ 66.174781] [] do_readv_writev+0x520/0x750 [ 66.180633] [] ? vfs_write+0x530/0x530 [ 66.186140] [] ? __pmd_alloc+0x410/0x410 [ 66.191819] [] ? dev_seq_stop+0x50/0x50 [ 66.197419] [] ? __do_page_fault+0x5ec/0xd40 [ 66.203454] [] vfs_readv+0x84/0xc0 [ 66.208617] [] do_readv+0xe6/0x250 [ 66.213801] [] ? vfs_readv+0xc0/0xc0 [ 66.219134] [] ? entry_SYSCALL_64_fastpath+0x5/0xe8 [ 66.225777] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 66.232585] [] SyS_readv+0x27/0x30 [ 66.237754] [] entry_SYSCALL_64_fastpath+0x29/0xe8 [ 66.244827] Dumping ftrace buffer: [ 66.248337] (ftrace buffer empty) [ 66.252021] Kernel Offset: disabled [ 66.255619] Rebooting in 86400 seconds..