[....] Starting enhanced syslogd: rsyslogd[ 12.876087] audit: type=1400 audit(1514807561.378:4): 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 '10.128.15.235' (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 syzkaller login: [ 20.612348] ================================================================== [ 20.619733] BUG: KASAN: out-of-bounds in __unwind_start+0x3a7/0x3c0 [ 20.626108] Read of size 8 at addr ffff8801c7d57850 by task syzkaller437064/3325 [ 20.633610] [ 20.635209] CPU: 0 PID: 3325 Comm: syzkaller437064 Not tainted 4.9.73-gf3f3457 #11 [ 20.642902] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.652225] ffff8801c7d2f138 ffffffff81d922b9 ffffea00071f55c0 ffff8801c7d57850 [ 20.660178] 0000000000000000 ffff8801c7d57858 ffff8801c7d2f268 ffff8801c7d2f170 [ 20.668153] ffffffff8153bab3 ffff8801c7d57850 0000000000000008 0000000000000000 [ 20.676120] Call Trace: [ 20.678680] [] dump_stack+0xc1/0x128 [ 20.684014] [] print_address_description+0x73/0x280 [ 20.690648] [] kasan_report+0x275/0x360 [ 20.696240] [] ? __unwind_start+0x3a7/0x3c0 [ 20.702180] [] __asan_report_load8_noabort+0x14/0x20 [ 20.708898] [] __unwind_start+0x3a7/0x3c0 [ 20.714661] [] ? ptrace_may_access+0x24/0x50 [ 20.720685] [] __save_stack_trace+0x59/0xf0 [ 20.726622] [] save_stack_trace_tsk+0x48/0x70 [ 20.732733] [] proc_pid_stack+0x146/0x230 [ 20.738497] [] ? lock_trace+0xc0/0xc0 [ 20.743913] [] proc_single_show+0xf8/0x170 [ 20.749768] [] seq_read+0x32f/0x1290 [ 20.755097] [] ? seq_escape+0x200/0x200 [ 20.760699] [] ? fsnotify+0x86/0xf30 [ 20.766029] [] ? fsnotify+0xf30/0xf30 [ 20.771453] [] ? avc_policy_seqno+0x9/0x20 [ 20.777305] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 20.784285] [] ? security_file_permission+0x89/0x1e0 [ 20.791003] [] ? seq_escape+0x200/0x200 [ 20.796596] [] ? seq_escape+0x200/0x200 [ 20.802192] [] do_readv_writev+0x520/0x750 [ 20.808043] [] ? vfs_write+0x530/0x530 [ 20.813547] [] ? kasan_unpoison_shadow+0x35/0x50 [ 20.819928] [] ? push_pipe+0x372/0x770 [ 20.825431] [] ? sanity+0x1ff/0x610 [ 20.830683] [] ? iov_iter_get_pages_alloc+0x2c7/0xf10 [ 20.837488] [] vfs_readv+0x84/0xc0 [ 20.842645] [] default_file_splice_read+0x43f/0x7a0 [ 20.849278] [] ? _raw_spin_unlock_irq+0x38/0x50 [ 20.855564] [] ? do_splice_direct+0x270/0x270 [ 20.861694] [] ? update_stack_state.constprop.5+0xca/0x150 [ 20.868940] [] ? __unwind_start+0x1e3/0x3c0 [ 20.874879] [] ? unwind_next_frame+0x86/0xe0 [ 20.880906] [] ? __fsnotify_parent+0xbc/0x340 [ 20.887017] [] ? fsnotify+0x86/0xf30 [ 20.892346] [] ? fsnotify+0xf30/0xf30 [ 20.897766] [] ? avc_policy_seqno+0x9/0x20 [ 20.903632] [] ? selinux_file_permission+0x82/0x460 [ 20.910264] [] ? security_file_permission+0x89/0x1e0 [ 20.916990] [] ? rw_verify_area+0xe5/0x2b0 [ 20.922841] [] ? do_splice_direct+0x270/0x270 [ 20.928952] [] do_splice_to+0x10a/0x160 [ 20.934549] [] splice_direct_to_actor+0x24d/0x800 [ 20.941016] [] ? generic_pipe_buf_nosteal+0x10/0x10 [ 20.947655] [] ? do_splice_to+0x160/0x160 [ 20.953420] [] ? security_file_permission+0x89/0x1e0 [ 20.960138] [] ? rw_verify_area+0xe5/0x2b0 [ 20.965993] [] do_splice_direct+0x1a7/0x270 [ 20.971930] [] ? splice_direct_to_actor+0x800/0x800 [ 20.978565] [] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 20.985114] [] ? __sb_start_write+0x14a/0x310 [ 20.991236] [] do_sendfile+0x54b/0xd30 [ 20.996741] [] ? do_compat_pwritev64+0x100/0x100 [ 21.003123] [] ? __might_fault+0x114/0x1d0 [ 21.008975] [] compat_SyS_sendfile+0xd1/0x160 [ 21.015087] [] ? SyS_sendfile64+0x160/0x160 [ 21.021025] [] ? do_fast_syscall_32+0xcf/0x890 [ 21.027224] [] ? SyS_sendfile64+0x160/0x160 [ 21.033160] [] do_fast_syscall_32+0x2f7/0x890 [ 21.039277] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 21.045912] [] entry_SYSENTER_compat+0x51/0x60 [ 21.052108] [ 21.053700] The buggy address belongs to the page: [ 21.058598] page:ffffea00071f55c0 count:0 mapcount:0 mapping: (null) index:0x0 [ 21.066816] flags: 0x8000000000000000() [ 21.070755] page dumped because: kasan: bad access detected [ 21.076428] [ 21.078024] Memory state around the buggy address: [ 21.082920] ffff8801c7d57700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 21.090246] ffff8801c7d57780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 21.097576] >ffff8801c7d57800: 00 00 00 f1 f1 f1 f1 00 00 00 00 f3 f3 f3 f3 00 [ 21.104901] ^ executing program [ 21.111097] ffff8801c7d57880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 21.118422] ffff8801c7d57900: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 [ 21.125920] ================================================================== [ 21.133243] Disabling lock debugging due to kernel taint [ 21.140987] Kernel panic - not syncing: panic_on_warn set ... [ 21.140987] [ 21.148347] CPU: 0 PID: 3325 Comm: syzkaller437064 Tainted: G B 4.9.73-gf3f3457 #11 [ 21.157237] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.166560] ffff8801c7d2f090 ffffffff81d922b9 ffffffff841955bf ffff8801c7d2f168 [ 21.174523] 0000000000000000 ffff8801c7d57858 ffff8801c7d2f268 ffff8801c7d2f158 [ 21.182995] ffffffff8142d741 0000000041b58ab3 ffffffff84189000 ffffffff8142d585 [ 21.190950] Call Trace: [ 21.193509] [] dump_stack+0xc1/0x128 [ 21.198842] [] panic+0x1bc/0x3a8 [ 21.203826] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 21.212022] [] ? preempt_schedule+0x25/0x30 [ 21.217960] [] ? ___preempt_schedule+0x16/0x18 [ 21.224159] [] kasan_end_report+0x50/0x50 [ 21.229925] [] kasan_report+0x167/0x360 [ 21.235516] [] ? __unwind_start+0x3a7/0x3c0 [ 21.241456] [] __asan_report_load8_noabort+0x14/0x20 [ 21.248175] [] __unwind_start+0x3a7/0x3c0 [ 21.253938] [] ? ptrace_may_access+0x24/0x50 [ 21.259962] [] __save_stack_trace+0x59/0xf0 [ 21.265899] [] save_stack_trace_tsk+0x48/0x70 [ 21.272014] [] proc_pid_stack+0x146/0x230 [ 21.277780] [] ? lock_trace+0xc0/0xc0 [ 21.283197] [] proc_single_show+0xf8/0x170 [ 21.289051] [] seq_read+0x32f/0x1290 [ 21.294385] [] ? seq_escape+0x200/0x200 [ 21.299975] [] ? fsnotify+0x86/0xf30 [ 21.305308] [] ? fsnotify+0xf30/0xf30 [ 21.310735] [] ? avc_policy_seqno+0x9/0x20 [ 21.316588] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 21.323572] [] ? security_file_permission+0x89/0x1e0 [ 21.330292] [] ? seq_escape+0x200/0x200 [ 21.335882] [] ? seq_escape+0x200/0x200 [ 21.341474] [] do_readv_writev+0x520/0x750 [ 21.347328] [] ? vfs_write+0x530/0x530 [ 21.352831] [] ? kasan_unpoison_shadow+0x35/0x50 [ 21.359206] [] ? push_pipe+0x372/0x770 [ 21.364711] [] ? sanity+0x1ff/0x610 [ 21.369957] [] ? iov_iter_get_pages_alloc+0x2c7/0xf10 [ 21.376765] [] vfs_readv+0x84/0xc0 [ 21.381921] [] default_file_splice_read+0x43f/0x7a0 [ 21.388556] [] ? _raw_spin_unlock_irq+0x38/0x50 [ 21.394845] [] ? do_splice_direct+0x270/0x270 [ 21.400958] [] ? update_stack_state.constprop.5+0xca/0x150 [ 21.408197] [] ? __unwind_start+0x1e3/0x3c0 [ 21.414152] [] ? unwind_next_frame+0x86/0xe0 [ 21.420181] [] ? __fsnotify_parent+0xbc/0x340 [ 21.426304] [] ? fsnotify+0x86/0xf30 [ 21.431634] [] ? fsnotify+0xf30/0xf30 [ 21.437062] [] ? avc_policy_seqno+0x9/0x20 [ 21.442915] [] ? selinux_file_permission+0x82/0x460 [ 21.449547] [] ? security_file_permission+0x89/0x1e0 [ 21.456280] [] ? rw_verify_area+0xe5/0x2b0 [ 21.462132] [] ? do_splice_direct+0x270/0x270 [ 21.468243] [] do_splice_to+0x10a/0x160 [ 21.473835] [] splice_direct_to_actor+0x24d/0x800 [ 21.480293] [] ? generic_pipe_buf_nosteal+0x10/0x10 [ 21.486934] [] ? do_splice_to+0x160/0x160 [ 21.492697] [] ? security_file_permission+0x89/0x1e0 [ 21.499417] [] ? rw_verify_area+0xe5/0x2b0 [ 21.505270] [] do_splice_direct+0x1a7/0x270 [ 21.511209] [] ? splice_direct_to_actor+0x800/0x800 [ 21.517845] [] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 21.524397] [] ? __sb_start_write+0x14a/0x310 [ 21.530509] [] do_sendfile+0x54b/0xd30 [ 21.536014] [] ? do_compat_pwritev64+0x100/0x100 [ 21.542400] [] ? __might_fault+0x114/0x1d0 [ 21.548253] [] compat_SyS_sendfile+0xd1/0x160 [ 21.554369] [] ? SyS_sendfile64+0x160/0x160 [ 21.560309] [] ? do_fast_syscall_32+0xcf/0x890 [ 21.566509] [] ? SyS_sendfile64+0x160/0x160 [ 21.572446] [] do_fast_syscall_32+0x2f7/0x890 [ 21.579483] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 21.586125] [] entry_SYSENTER_compat+0x51/0x60 [ 21.592797] Dumping ftrace buffer: [ 21.596307] (ftrace buffer empty) [ 21.599982] Kernel Offset: disabled [ 21.603576] Rebooting in 86400 seconds..