[ 10.167546] audit: type=1400 audit(1515387196.155:4): avc: denied { syslog } for pid=3162 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [....] Starting enhanced syslogd: rsyslogd[?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 '10.128.15.244' (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 syzkaller login: [ 20.409167] ================================================================== [ 20.410301] BUG: KASAN: stack-out-of-bounds in __unwind_start+0x3a7/0x3c0 [ 20.411212] Read of size 8 at addr ffff8801c880f8b8 by task syzkaller958067/3319 [ 20.412240] [ 20.412474] CPU: 1 PID: 3319 Comm: syzkaller958067 Not tainted 4.9.75-g5f5e5d4 #7 [ 20.413469] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.414687] ffff8801c8827900 ffffffff81d93049 ffffea00072203c0 ffff8801c880f8b8 [ 20.415839] 0000000000000000 ffff8801c880f8b8 ffff8801c8827a30 ffff8801c8827938 [ 20.416968] ffffffff8153ca53 ffff8801c880f8b8 0000000000000008 0000000000000000 [ 20.418135] Call Trace: [ 20.418508] [] dump_stack+0xc1/0x128 [ 20.419255] [] print_address_description+0x73/0x280 [ 20.420140] [] kasan_report+0x275/0x360 [ 20.420932] [] ? __unwind_start+0x3a7/0x3c0 [ 20.421745] [] __asan_report_load8_noabort+0x14/0x20 [ 20.422665] [] __unwind_start+0x3a7/0x3c0 [ 20.423430] [] ? ptrace_may_access+0x24/0x50 [ 20.424231] [] __save_stack_trace+0x59/0xf0 [ 20.425035] [] save_stack_trace_tsk+0x48/0x70 [ 20.425846] [] proc_pid_stack+0x146/0x230 [ 20.426628] [] ? lock_trace+0xc0/0xc0 [ 20.427348] [] proc_single_show+0xf8/0x170 [ 20.428126] [] seq_read+0x32f/0x1290 [ 20.428853] [] ? seq_escape+0x200/0x200 [ 20.429940] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 20.436920] [] ? seq_escape+0x200/0x200 [ 20.442518] [] __vfs_read+0x103/0x670 [ 20.447935] [] ? default_llseek+0x290/0x290 [ 20.453877] [] ? fsnotify+0x86/0xf30 [ 20.459211] [] ? fsnotify+0xf30/0xf30 [ 20.464632] [] ? avc_policy_seqno+0x9/0x20 [ 20.470487] [] ? selinux_file_permission+0x82/0x460 [ 20.477119] [] ? security_file_permission+0x89/0x1e0 [ 20.483842] [] ? rw_verify_area+0xe5/0x2b0 [ 20.489695] [] vfs_read+0x11e/0x380 [ 20.494940] [] SyS_pread64+0x13f/0x170 [ 20.500455] [] ? SyS_write+0x1b0/0x1b0 [ 20.505963] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 20.512783] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 20.519333] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 20.525877] [ 20.527471] The buggy address belongs to the page: [ 20.532368] page:ffffea00072203c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 20.540591] flags: 0x8000000000000000() [ 20.544530] page dumped because: kasan: bad access detected [ 20.550207] [ 20.551802] Memory state around the buggy address: [ 20.556700] ffff8801c880f780: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 [ 20.564026] ffff8801c880f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 20.571350] >ffff8801c880f880: 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2 [ 20.578675] ^ [ 20.583831] ffff8801c880f900: f2 f2 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 [ 20.591156] ffff8801c880f980: f2 f2 00 00 00 00 00 f2 f2 f2 f2 f2 f2 f2 00 00 [ 20.598481] ================================================================== [ 20.605804] Disabling lock debugging due to kernel taint [ 20.618501] Kernel panic - not syncing: panic_on_warn set ... [ 20.618501] [ 20.625915] CPU: 1 PID: 3319 Comm: syzkaller958067 Tainted: G B 4.9.75-g5f5e5d4 #7 [ 20.625918] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.625932] ffff8801c8827858 ffffffff81d93049 ffffffff84195be7 ffff8801c8827930 [ 20.625938] 0000000000000000 ffff8801c880f8b8 ffff8801c8827a30 ffff8801c8827920 [ 20.625945] ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5 [ 20.625947] Call Trace: [ 20.625963] [] dump_stack+0xc1/0x128 [ 20.625973] [] panic+0x1bc/0x3a8 [ 20.625981] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 20.625992] [] ? preempt_schedule+0x25/0x30 [ 20.626000] [] ? ___preempt_schedule+0x16/0x18 [ 20.626010] [] kasan_end_report+0x50/0x50 [ 20.626016] [] kasan_report+0x167/0x360 [ 20.626024] [] ? __unwind_start+0x3a7/0x3c0 [ 20.626031] [] __asan_report_load8_noabort+0x14/0x20 [ 20.626037] [] __unwind_start+0x3a7/0x3c0 [ 20.626046] [] ? ptrace_may_access+0x24/0x50 [ 20.626052] [] __save_stack_trace+0x59/0xf0 [ 20.626059] [] save_stack_trace_tsk+0x48/0x70 [ 20.626066] [] proc_pid_stack+0x146/0x230 [ 20.626072] [] ? lock_trace+0xc0/0xc0 [ 20.626079] [] proc_single_show+0xf8/0x170 [ 20.626087] [] seq_read+0x32f/0x1290 [ 20.626094] [] ? seq_escape+0x200/0x200 [ 20.626104] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 20.626110] [] ? seq_escape+0x200/0x200 [ 20.626117] [] __vfs_read+0x103/0x670 [ 20.626124] [] ? default_llseek+0x290/0x290 [ 20.626131] [] ? fsnotify+0x86/0xf30 [ 20.626137] [] ? fsnotify+0xf30/0xf30 [ 20.626145] [] ? avc_policy_seqno+0x9/0x20 [ 20.626151] [] ? selinux_file_permission+0x82/0x460 [ 20.626158] [] ? security_file_permission+0x89/0x1e0 [ 20.626164] [] ? rw_verify_area+0xe5/0x2b0 [ 20.626170] [] vfs_read+0x11e/0x380 [ 20.626177] [] SyS_pread64+0x13f/0x170 [ 20.626183] [] ? SyS_write+0x1b0/0x1b0 [ 20.626190] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 20.626196] [] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 20.626211] [] entry_SYSCALL_64_fastpath+0x23/0xe2 [ 20.635169] Dumping ftrace buffer: [ 20.635173] (ftrace buffer empty) [ 20.635176] Kernel Offset: disabled [ 20.882401] Rebooting in 86400 seconds..