[....] Starting enhanced syslogd: rsyslogd[ 13.736759] audit: type=1400 audit(1516096855.807:4): avc: denied { syslog } for pid=3177 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 '10.128.15.199' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 syzkaller login: [ 27.644200] IPVS: Creating netns size=2536 id=1 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" [ 28.124112] audit: type=1400 audit(1516096870.187:5): avc: denied { sys_admin } for pid=3333 comm="syzkaller536993" capability=21 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 executing program [ 28.166540] audit: type=1400 audit(1516096870.237:6): avc: denied { sys_chroot } for pid=3545 comm="syzkaller536993" capability=18 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=cap_userns permissive=1 [ 28.195025] ================================================================== [ 28.202425] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0x103/0x120 [ 28.209494] Read of size 8 at addr ffff8801c58a5140 by task syzkaller536993/3547 [ 28.216990] [ 28.218587] CPU: 0 PID: 3547 Comm: syzkaller536993 Not tainted 4.9.76-g8dec074 #23 [ 28.226257] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.235580] ffff8801c5a8f940 ffffffff81d93169 ffffea0007162940 ffff8801c58a5140 [ 28.243536] 0000000000000000 ffff8801c58a5140 ffff8801c87b2338 ffff8801c5a8f978 [ 28.251479] ffffffff8153cb43 ffff8801c58a5140 0000000000000008 0000000000000000 [ 28.259424] Call Trace: [ 28.261988] [] dump_stack+0xc1/0x128 [ 28.267326] [] print_address_description+0x73/0x280 [ 28.273968] [] kasan_report+0x275/0x360 [ 28.279559] [] ? sg_remove_request+0x103/0x120 [ 28.285756] [] __asan_report_load8_noabort+0x14/0x20 [ 28.292477] [] sg_remove_request+0x103/0x120 [ 28.298500] [] sg_finish_rem_req+0x295/0x340 [ 28.304523] [] sg_read+0xa1c/0x1440 [ 28.309766] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.316400] [] ? fsnotify+0xf30/0xf30 [ 28.321820] [] ? avc_policy_seqno+0x9/0x20 [ 28.327672] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 28.334649] [] ? security_file_permission+0x89/0x1e0 [ 28.341367] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.347998] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.354630] [] compat_do_readv_writev+0x522/0x760 [ 28.361089] [] ? do_pwritev+0x1a0/0x1a0 [ 28.366681] [] ? __lru_cache_add+0x187/0x250 [ 28.372707] [] ? check_preemption_disabled+0x3b/0x200 [ 28.379511] [] ? __fget+0x201/0x3a0 [ 28.384753] [] ? __fget+0x228/0x3a0 [ 28.389995] [] ? __fget+0x47/0x3a0 [ 28.395149] [] compat_readv+0xe3/0x150 [ 28.400661] [] do_compat_readv+0xf4/0x1d0 [ 28.406440] [] ? compat_readv+0x150/0x150 [ 28.412202] [] compat_SyS_readv+0x26/0x30 [ 28.417973] [] ? SyS_pwritev2+0x80/0x80 [ 28.423561] [] do_fast_syscall_32+0x2f7/0x890 [ 28.429682] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.436315] [] entry_SYSENTER_compat+0x74/0x83 [ 28.442508] [ 28.444101] Allocated by task 0: [ 28.447430] (stack is not available) [ 28.451105] [ 28.452699] Freed by task 0: [ 28.455677] (stack is not available) [ 28.459352] [ 28.460947] The buggy address belongs to the object at ffff8801c58a5100 [ 28.460947] which belongs to the cache fasync_cache of size 96 [ 28.473566] The buggy address is located 64 bytes inside of [ 28.473566] 96-byte region [ffff8801c58a5100, ffff8801c58a5160) [ 28.485232] The buggy address belongs to the page: [ 28.490127] page:ffffea0007162940 count:1 mapcount:0 mapping: (null) index:0x0 [ 28.498354] flags: 0x8000000000000080(slab) [ 28.502637] page dumped because: kasan: bad access detected [ 28.508309] [ 28.509903] Memory state around the buggy address: [ 28.514805] ffff8801c58a5000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 28.522136] ffff8801c58a5080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 28.529467] >ffff8801c58a5100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 28.536790] ^ [ 28.542203] ffff8801c58a5180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 28.549525] ffff8801c58a5200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 28.556934] ================================================================== [ 28.564263] Disabling lock debugging due to kernel taint [ 28.570093] Kernel panic - not syncing: panic_on_warn set ... [ 28.570093] [ 28.577446] CPU: 0 PID: 3547 Comm: syzkaller536993 Tainted: G B 4.9.76-g8dec074 #23 [ 28.586333] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.595655] ffff8801c5a8f898 ffffffff81d93169 ffffffff84195c2f ffff8801c5a8f970 [ 28.603607] 0000000000000000 ffff8801c58a5140 ffff8801c87b2338 ffff8801c5a8f960 [ 28.611564] ffffffff8142e371 0000000041b58ab3 ffffffff84189690 ffffffff8142e1b5 [ 28.619531] Call Trace: [ 28.622098] [] dump_stack+0xc1/0x128 [ 28.627431] [] panic+0x1bc/0x3a8 [ 28.632413] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 28.640609] [] ? preempt_schedule+0x25/0x30 [ 28.646548] [] ? ___preempt_schedule+0x16/0x18 [ 28.652746] [] kasan_end_report+0x50/0x50 [ 28.658509] [] kasan_report+0x167/0x360 [ 28.664098] [] ? sg_remove_request+0x103/0x120 [ 28.670295] [] __asan_report_load8_noabort+0x14/0x20 [ 28.677012] [] sg_remove_request+0x103/0x120 [ 28.683035] [] sg_finish_rem_req+0x295/0x340 [ 28.689057] [] sg_read+0xa1c/0x1440 [ 28.694298] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.700929] [] ? fsnotify+0xf30/0xf30 [ 28.706343] [] ? avc_policy_seqno+0x9/0x20 [ 28.712193] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 28.719171] [] ? security_file_permission+0x89/0x1e0 [ 28.725897] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.732526] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 28.739165] [] compat_do_readv_writev+0x522/0x760 [ 28.745622] [] ? do_pwritev+0x1a0/0x1a0 [ 28.751211] [] ? __lru_cache_add+0x187/0x250 [ 28.757234] [] ? check_preemption_disabled+0x3b/0x200 [ 28.764037] [] ? __fget+0x201/0x3a0 [ 28.769275] [] ? __fget+0x228/0x3a0 [ 28.774513] [] ? __fget+0x47/0x3a0 [ 28.779666] [] compat_readv+0xe3/0x150 [ 28.785166] [] do_compat_readv+0xf4/0x1d0 [ 28.790925] [] ? compat_readv+0x150/0x150 [ 28.796688] [] compat_SyS_readv+0x26/0x30 [ 28.802451] [] ? SyS_pwritev2+0x80/0x80 [ 28.808046] [] do_fast_syscall_32+0x2f7/0x890 [ 28.814155] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 28.820787] [] entry_SYSENTER_compat+0x74/0x83 [ 28.827434] Dumping ftrace buffer: [ 28.830949] (ftrace buffer empty) [ 28.834625] Kernel Offset: disabled [ 28.838220] Rebooting in 86400 seconds..