[....] Starting enhanced syslogd: rsyslogd[ 11.438207] audit: type=1400 audit(1516075084.931:4): avc: denied { syslog } for pid=3181 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.244' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 21.261574] ================================================================== [ 21.269001] BUG: KASAN: stack-out-of-bounds in __unwind_start+0x3a7/0x3c0 [ 21.275901] Read of size 8 at addr ffff8801c8407ad8 by task syzkaller011866/3699 [ 21.283404] [ 21.285008] CPU: 1 PID: 3699 Comm: syzkaller011866 Not tainted 4.9.76-g8dec074 #23 [ 21.292685] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.302014] ffff8801c8bbf860 ffffffff81d93169 ffffea00072101c0 ffff8801c8407ad8 [ 21.309999] 0000000000000000 ffff8801c8407ad8 ffff8801c8bbf990 ffff8801c8bbf898 [ 21.317976] ffffffff8153cb43 ffff8801c8407ad8 0000000000000008 0000000000000000 [ 21.325953] Call Trace: [ 21.328513] [] dump_stack+0xc1/0x128 [ 21.333852] [] print_address_description+0x73/0x280 [ 21.340500] [] kasan_report+0x275/0x360 [ 21.346094] [] ? __unwind_start+0x3a7/0x3c0 [ 21.352035] [] __asan_report_load8_noabort+0x14/0x20 [ 21.358773] [] __unwind_start+0x3a7/0x3c0 [ 21.364543] [] ? ptrace_may_access+0x24/0x50 [ 21.370581] [] __save_stack_trace+0x59/0xf0 [ 21.376523] [] save_stack_trace_tsk+0x48/0x70 [ 21.382650] [] proc_pid_stack+0x146/0x230 [ 21.388423] [] ? lock_trace+0xc0/0xc0 [ 21.393845] [] proc_single_show+0xf8/0x170 [ 21.399707] [] seq_read+0x32f/0x1290 [ 21.405040] [] ? seq_escape+0x200/0x200 [ 21.410635] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 21.417619] [] ? seq_escape+0x200/0x200 [ 21.423216] [] __vfs_read+0x103/0x670 [ 21.428638] [] ? default_llseek+0x290/0x290 [ 21.434597] [] ? fsnotify+0x86/0xf30 [ 21.439942] [] ? fsnotify+0xf30/0xf30 [ 21.445365] [] ? avc_policy_seqno+0x9/0x20 [ 21.451221] [] ? selinux_file_permission+0x82/0x460 [ 21.457856] [] ? security_file_permission+0x89/0x1e0 [ 21.464584] [] ? rw_verify_area+0xe5/0x2b0 [ 21.470450] [] vfs_read+0x11e/0x380 [ 21.475697] [] SyS_pread64+0x13f/0x170 [ 21.481206] [] ? SyS_write+0x1b0/0x1b0 [ 21.486715] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 21.493002] [] sys32_pread+0x39/0x50 [ 21.498337] [] ? sys32_waitpid+0x30/0x30 [ 21.504021] [] do_fast_syscall_32+0x2f7/0x890 [ 21.510149] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 21.516786] [] entry_SYSENTER_compat+0x74/0x83 [ 21.522986] [ 21.524585] The buggy address belongs to the page: [ 21.529486] page:ffffea00072101c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 21.537713] flags: 0x8000000000000000() [ 21.541656] page dumped because: kasan: bad access detected [ 21.547334] [ 21.548930] Memory state around the buggy address: [ 21.553832] ffff8801c8407980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 21.561162] ffff8801c8407a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 21.568491] >ffff8801c8407a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 21.575820] ^ [ 21.582022] ffff8801c8407b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 21.589351] ffff8801c8407b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 21.596677] ================================================================== [ 21.604177] Disabling lock debugging due to kernel taint [ 21.609985] Kernel panic - not syncing: panic_on_warn set ... [ 21.609985] [ 21.617333] CPU: 1 PID: 3699 Comm: syzkaller011866 Tainted: G B 4.9.76-g8dec074 #23 [ 21.626242] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.635570] ffff8801c8bbf7b8 ffffffff81d93169 ffffffff84195c2f ffff8801c8bbf890 [ 21.643545] 0000000000000000 ffff8801c8407ad8 ffff8801c8bbf990 ffff8801c8bbf880 [ 21.651548] ffffffff8142e371 0000000041b58ab3 ffffffff84189690 ffffffff8142e1b5 [ 21.659544] Call Trace: [ 21.662107] [] dump_stack+0xc1/0x128 [ 21.667442] [] panic+0x1bc/0x3a8 [ 21.672427] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 21.680628] [] ? preempt_schedule+0x25/0x30 [ 21.686582] [] ? ___preempt_schedule+0x16/0x18 [ 21.692799] [] kasan_end_report+0x50/0x50 [ 21.698580] [] kasan_report+0x167/0x360 [ 21.704177] [] ? __unwind_start+0x3a7/0x3c0 [ 21.710120] [] __asan_report_load8_noabort+0x14/0x20 [ 21.716841] [] __unwind_start+0x3a7/0x3c0 [ 21.722622] [] ? ptrace_may_access+0x24/0x50 [ 21.728661] [] __save_stack_trace+0x59/0xf0 [ 21.734601] [] save_stack_trace_tsk+0x48/0x70 [ 21.740718] [] proc_pid_stack+0x146/0x230 [ 21.746487] [] ? lock_trace+0xc0/0xc0 [ 21.751910] [] proc_single_show+0xf8/0x170 [ 21.757768] [] seq_read+0x32f/0x1290 [ 21.763103] [] ? seq_escape+0x200/0x200 [ 21.768701] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 21.775685] [] ? seq_escape+0x200/0x200 [ 21.781278] [] __vfs_read+0x103/0x670 [ 21.786701] [] ? default_llseek+0x290/0x290 [ 21.792644] [] ? fsnotify+0x86/0xf30 [ 21.797978] [] ? fsnotify+0xf30/0xf30 [ 21.803398] [] ? avc_policy_seqno+0x9/0x20 [ 21.809255] [] ? selinux_file_permission+0x82/0x460 [ 21.815891] [] ? security_file_permission+0x89/0x1e0 [ 21.822616] [] ? rw_verify_area+0xe5/0x2b0 [ 21.828481] [] vfs_read+0x11e/0x380 [ 21.833729] [] SyS_pread64+0x13f/0x170 [ 21.839240] [] ? SyS_write+0x1b0/0x1b0 [ 21.844761] [] ? _raw_spin_unlock_irq+0x27/0x50 [ 21.851051] [] sys32_pread+0x39/0x50 [ 21.856393] [] ? sys32_waitpid+0x30/0x30 [ 21.862075] [] do_fast_syscall_32+0x2f7/0x890 [ 21.868191] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 21.874829] [] entry_SYSENTER_compat+0x74/0x83 [ 21.881459] Dumping ftrace buffer: [ 21.884981] (ftrace buffer empty) [ 21.888674] Kernel Offset: disabled [ 21.892273] Rebooting in 86400 seconds..