[....] Starting enhanced syslogd: rsyslogd[ 12.310156] audit: type=1400 audit(1549617181.143:4): avc: denied { syslog } for pid=1904 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[ 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 '10.128.10.58' (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 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 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 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 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 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 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 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 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 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 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 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: [ 43.580509] ================================================================== [ 43.587906] BUG: KASAN: out-of-bounds in __unwind_start+0x34b/0x370 [ 43.594288] Read of size 8 at addr ffff8801c847f8b8 by task syz-executor506/4880 [ 43.601808] [ 43.603417] CPU: 1 PID: 4880 Comm: syz-executor506 Not tainted 4.9.155+ #27 [ 43.610492] ffff8801c8b776b8 ffffffff81b47871 0000000000000000 ffffea0007211fc0 [ 43.618504] ffff8801c847f8b8 0000000000000008 ffffffff810abb0b ffff8801c8b776f0 [ 43.626516] ffffffff81502825 0000000000000000 ffff8801c847f8c0 ffff8801c847f8b8 [ 43.634527] Call Trace: [ 43.637093] [] dump_stack+0xc1/0x120 [ 43.642434] [] ? __unwind_start+0x34b/0x370 [ 43.648395] [] print_address_description+0x6f/0x238 [ 43.655037] [] ? __unwind_start+0x34b/0x370 [ 43.660994] [] kasan_report.cold+0x8c/0x2ba [ 43.666960] [] __asan_report_load8_noabort+0x14/0x20 [ 43.673689] [] __unwind_start+0x34b/0x370 [ 43.679473] [] ? ptrace_may_access+0x25/0x50 [ 43.685509] [] __save_stack_trace+0x59/0xf0 [ 43.691463] [] save_stack_trace_tsk+0x42/0x60 [ 43.697595] [] proc_pid_stack+0x1a2/0x290 [ 43.703382] [] ? check_preemption_disabled+0x3c/0x200 [ 43.710197] [] ? lock_trace+0xc0/0xc0 [ 43.715632] [] ? check_preemption_disabled+0x3c/0x200 [ 43.722456] [] ? get_pid_task+0x9e/0x150 [ 43.728145] [] proc_single_show+0xf6/0x160 [ 43.734003] [] traverse+0x35b/0x910 [ 43.739253] [] ? seq_buf_alloc+0x70/0x70 [ 43.744939] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 43.751666] [] seq_read+0x9c7/0x1250 [ 43.757004] [] ? seq_lseek+0x3c0/0x3c0 [ 43.762516] [] ? __fsnotify_inode_delete+0x30/0x30 [ 43.769069] [] do_loop_readv_writev.part.0+0xcc/0x2c0 [ 43.775905] [] do_readv_writev+0x556/0x7a0 [ 43.781763] [] ? vfs_write+0x520/0x520 [ 43.787278] [] ? check_preemption_disabled+0x3c/0x200 [ 43.794095] [] ? check_preemption_disabled+0x3c/0x200 [ 43.800912] [] ? __fget+0x208/0x370 [ 43.806164] [] ? __fget+0x22f/0x370 [ 43.811418] [] ? __fget+0x47/0x370 [ 43.816602] [] vfs_readv+0x86/0xc0 [ 43.821765] [] do_preadv+0x19b/0x240 [ 43.827103] [] ? do_readv+0x260/0x260 [ 43.832541] [] ? call_rcu+0x12/0x20 [ 43.837816] [] ? SyS_writev+0x30/0x30 [ 43.837823] [] SyS_preadv+0x31/0x40 [ 43.837830] [] do_syscall_64+0x1ad/0x570 [ 43.837841] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 43.837847] [ 43.837849] The buggy address belongs to the page: [ 43.837856] page:ffffea0007211fc0 count:0 mapcount:0 mapping: (null) index:0x0 [ 43.837860] flags: 0x4000000000000000() [ 43.837862] page dumped because: kasan: bad access detected [ 43.837863] [ 43.837864] Memory state around the buggy address: [ 43.837870] ffff8801c847f780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 43.837874] ffff8801c847f800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 43.837878] >ffff8801c847f880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 43.837881] ^ [ 43.837886] ffff8801c847f900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 43.837891] ffff8801c847f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 43.837893] ================================================================== [ 43.837895] Disabling lock debugging due to kernel taint [ 43.839619] Kernel panic - not syncing: panic_on_warn set ... [ 43.839619] [ 43.839628] CPU: 1 PID: 4880 Comm: syz-executor506 Tainted: G B 4.9.155+ #27 [ 43.839641] ffff8801c8b775f8 ffffffff81b47871 ffff8801c8b77700 ffffffff82e43a22 [ 43.839650] 00000000ffffffff 0000000000000001 ffffffff810abb0b ffff8801c8b776d8 [ 43.839660] ffffffff813f746a 0000000041b58ab3 ffffffff82e35b4a ffffffff813f7291 [ 43.839662] Call Trace: [ 43.839671] [] dump_stack+0xc1/0x120 [ 43.839679] [] ? __unwind_start+0x34b/0x370 [ 43.839687] [] panic+0x1d9/0x3bd [ 43.839694] [] ? add_taint.cold+0x16/0x16 [ 43.839704] [] ? preempt_schedule_common+0x4f/0xe0 [ 43.839711] [] ? __unwind_start+0x34b/0x370 [ 43.839738] [] ? preempt_schedule+0x26/0x30 [ 43.839747] [] ? ___preempt_schedule+0x16/0x18 [ 43.839756] [] kasan_end_report+0x47/0x4f [ 43.839778] [] kasan_report.cold+0xa9/0x2ba [ 43.839786] [] __asan_report_load8_noabort+0x14/0x20 [ 43.839792] [] __unwind_start+0x34b/0x370 [ 43.839800] [] ? ptrace_may_access+0x25/0x50 [ 43.839808] [] __save_stack_trace+0x59/0xf0 [ 43.839816] [] save_stack_trace_tsk+0x42/0x60 [ 43.839825] [] proc_pid_stack+0x1a2/0x290 [ 43.839833] [] ? check_preemption_disabled+0x3c/0x200 [ 43.839840] [] ? lock_trace+0xc0/0xc0 [ 43.839848] [] ? check_preemption_disabled+0x3c/0x200 [ 43.839854] [] ? get_pid_task+0x9e/0x150 [ 43.839862] [] proc_single_show+0xf6/0x160 [ 43.839869] [] traverse+0x35b/0x910 [ 43.839875] [] ? seq_buf_alloc+0x70/0x70 [ 43.839882] [] ? debug_lockdep_rcu_enabled+0x71/0xa0 [ 43.839896] [] seq_read+0x9c7/0x1250 [ 43.839903] [] ? seq_lseek+0x3c0/0x3c0 [ 43.839911] [] ? __fsnotify_inode_delete+0x30/0x30 [ 43.839933] [] do_loop_readv_writev.part.0+0xcc/0x2c0 [ 43.839940] [] do_readv_writev+0x556/0x7a0 [ 43.839948] [] ? vfs_write+0x520/0x520 [ 43.839971] [] ? check_preemption_disabled+0x3c/0x200 [ 43.839978] [] ? check_preemption_disabled+0x3c/0x200 [ 43.839987] [] ? __fget+0x208/0x370 [ 43.839994] [] ? __fget+0x22f/0x370 [ 43.840000] [] ? __fget+0x47/0x370 [ 43.840011] [] vfs_readv+0x86/0xc0 [ 43.840017] [] do_preadv+0x19b/0x240 [ 43.840024] [] ? do_readv+0x260/0x260 [ 43.840030] [] ? call_rcu+0x12/0x20 [ 43.840037] [] ? SyS_writev+0x30/0x30 [ 43.840044] [] SyS_preadv+0x31/0x40 [ 43.840051] [] do_syscall_64+0x1ad/0x570 [ 43.840059] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 43.843616] Kernel Offset: disabled [ 44.243339] Rebooting in 86400 seconds..