[....] Starting enhanced syslogd: rsyslogd[ 13.650310] audit: type=1400 audit(1516640787.170:4): avc: denied { syslog } for pid=3174 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 '10.128.15.217' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 25.573209] IPVS: Creating netns size=2536 id=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 26.127507] ================================================================== [ 26.134891] BUG: KASAN: out-of-bounds in __unwind_start+0x3a7/0x3c0 [ 26.141263] Read of size 8 at addr ffff8801c8b87850 by task syzkaller877355/3334 [ 26.148760] [ 26.150378] CPU: 0 PID: 3334 Comm: syzkaller877355 Not tainted 4.9.77-ge12a9c4 #27 [ 26.158050] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.167382] ffff8801c807f778 ffffffff81d941c9 ffffea000722e1c0 ffff8801c8b87850 [ 26.175364] 0000000000000000 ffff8801c8b87858 ffff8801c807f8a8 ffff8801c807f7b0 [ 26.183341] ffffffff8153db93 ffff8801c8b87850 0000000000000008 0000000000000000 [ 26.191304] Call Trace: [ 26.193863] [] dump_stack+0xc1/0x128 [ 26.199204] [] print_address_description+0x73/0x280 [ 26.205838] [] kasan_report+0x275/0x360 [ 26.211431] [] ? __unwind_start+0x3a7/0x3c0 [ 26.217370] [] __asan_report_load8_noabort+0x14/0x20 [ 26.224087] [] __unwind_start+0x3a7/0x3c0 [ 26.229854] [] ? ptrace_may_access+0x24/0x50 [ 26.235888] [] __save_stack_trace+0x59/0xf0 [ 26.241826] [] save_stack_trace_tsk+0x48/0x70 [ 26.247946] [] proc_pid_stack+0x146/0x230 [ 26.253711] [] ? lock_trace+0xc0/0xc0 [ 26.259128] [] proc_single_show+0xf8/0x170 [ 26.264987] [] traverse+0x231/0x900 [ 26.270232] [] ? seq_buf_alloc+0x80/0x80 [ 26.275913] [] seq_read+0x7ea/0x1290 [ 26.281241] [] ? putname+0xee/0x130 [ 26.286487] [] ? save_stack_trace+0x16/0x20 [ 26.292427] [] ? save_stack+0x43/0xd0 [ 26.297847] [] ? kasan_slab_free+0x72/0xc0 [ 26.303703] [] ? seq_escape+0x200/0x200 [ 26.309297] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 26.316280] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 26.323088] [] ? seq_escape+0x200/0x200 [ 26.328679] [] __vfs_read+0x103/0x670 [ 26.334096] [] ? default_llseek+0x290/0x290 [ 26.340036] [] ? fsnotify+0x86/0xf30 [ 26.345368] [] ? fsnotify+0xf30/0xf30 [ 26.350791] [] ? avc_policy_seqno+0x9/0x20 [ 26.356642] [] ? selinux_file_permission+0x82/0x460 [ 26.363276] [] ? security_file_permission+0x89/0x1e0 [ 26.369995] [] ? rw_verify_area+0xe5/0x2b0 [ 26.375848] [] vfs_read+0x11e/0x380 [ 26.381098] [] SyS_pread64+0x13f/0x170 [ 26.386601] [] ? SyS_write+0x1b0/0x1b0 [ 26.392105] [] sys32_pread+0x39/0x50 [ 26.397438] [] ? sys32_waitpid+0x30/0x30 [ 26.403120] [] do_fast_syscall_32+0x2f7/0x890 [ 26.409233] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.415869] [] entry_SYSENTER_compat+0x74/0x83 [ 26.422065] [ 26.423662] The buggy address belongs to the page: [ 26.428559] page:ffffea000722e1c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 26.436780] flags: 0x8000000000000000() [ 26.440719] page dumped because: kasan: bad access detected [ 26.446402] [ 26.447995] Memory state around the buggy address: [ 26.452891] ffff8801c8b87700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 26.460220] ffff8801c8b87780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 26.467545] >ffff8801c8b87800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 26.474874] ^ [ 26.481073] ffff8801c8b87880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 26.488401] ffff8801c8b87900: 00 00 f1 f1 f1 f1 00 f2 f2 f2 f3 f3 f3 f3 00 00 [ 26.495726] ================================================================== [ 26.503057] Disabling lock debugging due to kernel taint [ 26.508928] Kernel panic - not syncing: panic_on_warn set ... [ 26.508928] [ 26.516271] CPU: 0 PID: 3334 Comm: syzkaller877355 Tainted: G B 4.9.77-ge12a9c4 #27 [ 26.525255] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.534582] ffff8801c807f6d0 ffffffff81d941c9 ffffffff841970ff ffff8801c807f7a8 [ 26.542554] 0000000000000000 ffff8801c8b87858 ffff8801c807f8a8 ffff8801c807f798 [ 26.550528] ffffffff8142f3c1 0000000041b58ab3 ffffffff8418ab70 ffffffff8142f205 [ 26.558493] Call Trace: [ 26.561050] [] dump_stack+0xc1/0x128 [ 26.566381] [] panic+0x1bc/0x3a8 [ 26.571377] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 26.579576] [] ? preempt_schedule+0x25/0x30 [ 26.585517] [] ? ___preempt_schedule+0x16/0x18 [ 26.591719] [] kasan_end_report+0x50/0x50 [ 26.597495] [] kasan_report+0x167/0x360 [ 26.603088] [] ? __unwind_start+0x3a7/0x3c0 [ 26.609028] [] __asan_report_load8_noabort+0x14/0x20 [ 26.615751] [] __unwind_start+0x3a7/0x3c0 [ 26.621518] [] ? ptrace_may_access+0x24/0x50 [ 26.627545] [] __save_stack_trace+0x59/0xf0 [ 26.633485] [] save_stack_trace_tsk+0x48/0x70 [ 26.639600] [] proc_pid_stack+0x146/0x230 [ 26.645367] [] ? lock_trace+0xc0/0xc0 [ 26.650784] [] proc_single_show+0xf8/0x170 [ 26.656639] [] traverse+0x231/0x900 [ 26.661883] [] ? seq_buf_alloc+0x80/0x80 [ 26.667562] [] seq_read+0x7ea/0x1290 [ 26.672892] [] ? putname+0xee/0x130 [ 26.678139] [] ? save_stack_trace+0x16/0x20 [ 26.684080] [] ? save_stack+0x43/0xd0 [ 26.689497] [] ? kasan_slab_free+0x72/0xc0 [ 26.695349] [] ? seq_escape+0x200/0x200 [ 26.700943] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 26.707927] [] ? debug_check_no_obj_freed+0x154/0xa10 [ 26.714738] [] ? seq_escape+0x200/0x200 [ 26.720331] [] __vfs_read+0x103/0x670 [ 26.725760] [] ? default_llseek+0x290/0x290 [ 26.731701] [] ? fsnotify+0x86/0xf30 [ 26.737033] [] ? fsnotify+0xf30/0xf30 [ 26.742455] [] ? avc_policy_seqno+0x9/0x20 [ 26.748306] [] ? selinux_file_permission+0x82/0x460 [ 26.754948] [] ? security_file_permission+0x89/0x1e0 [ 26.761766] [] ? rw_verify_area+0xe5/0x2b0 [ 26.767617] [] vfs_read+0x11e/0x380 [ 26.772862] [] SyS_pread64+0x13f/0x170 [ 26.778366] [] ? SyS_write+0x1b0/0x1b0 [ 26.783872] [] sys32_pread+0x39/0x50 [ 26.789204] [] ? sys32_waitpid+0x30/0x30 [ 26.794895] [] do_fast_syscall_32+0x2f7/0x890 [ 26.801108] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.807756] [] entry_SYSENTER_compat+0x74/0x83 [ 26.814382] Dumping ftrace buffer: [ 26.817888] (ftrace buffer empty) [ 26.821565] Kernel Offset: disabled [ 26.825161] Rebooting in 86400 seconds..