INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?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 'ci-upstream-next-kasan-gce-2,10.128.0.33' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 25.954292] ================================================================== [ 25.955401] BUG: KASAN: global-out-of-bounds in show_timer+0x278/0x2b0 [ 25.956277] Read of size 8 at addr ffffffff85343578 by task syzkaller289632/3091 [ 25.957282] [ 25.957514] CPU: 1 PID: 3091 Comm: syzkaller289632 Not tainted 4.15.0-rc1-next-20171201+ #57 [ 25.958633] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.959867] Call Trace: [ 25.960227] dump_stack+0x194/0x257 [ 25.960734] ? arch_local_irq_restore+0x53/0x53 [ 25.961360] ? show_regs_print_info+0x65/0x65 [ 25.961962] ? seq_printf+0xb3/0xe0 [ 25.962454] ? show_timer+0x278/0x2b0 [ 25.962969] print_address_description+0x178/0x250 [ 25.963627] ? show_timer+0x278/0x2b0 [ 25.964139] kasan_report+0x25b/0x340 [ 25.964668] __asan_report_load8_noabort+0x14/0x20 [ 25.965347] show_timer+0x278/0x2b0 [ 25.965872] ? timers_start+0x14c/0x1c0 [ 25.966436] seq_read+0x385/0x13d0 [ 25.966964] ? seq_lseek+0x3c0/0x3c0 [ 25.967481] ? selinux_file_permission+0x82/0x460 [ 25.968131] ? security_file_permission+0x89/0x1f0 [ 25.968803] ? rw_verify_area+0xe5/0x2b0 [ 25.969363] do_iter_read+0x3db/0x5b0 [ 25.969893] ? dup_iter+0x260/0x260 [ 25.970391] vfs_readv+0x121/0x1c0 [ 25.970885] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 25.971635] ? mm_fault_error+0x2c0/0x2c0 [ 25.972196] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.972977] ? fget_raw+0x20/0x20 [ 25.973446] ? do_page_fault+0xee/0x720 [ 25.974002] do_preadv+0x11b/0x1a0 [ 25.974480] ? do_preadv+0x11b/0x1a0 [ 25.978167] SyS_preadv+0x30/0x40 [ 25.981597] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 25.986319] RIP: 0033:0x440209 [ 25.989479] RSP: 002b:00007fff70ef6758 EFLAGS: 00000217 ORIG_RAX: 0000000000000127 [ 25.997154] RAX: ffffffffffffffda RBX: 00007fff70ef6760 RCX: 0000000000440209 [ 26.004392] RDX: 0000000000000008 RSI: 0000000020508000 RDI: 0000000000000003 [ 26.011631] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 26.018867] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401ad0 [ 26.026111] R13: 0000000000401b60 R14: 0000000000000000 R15: 0000000000000000 [ 26.033367] [ 26.034959] The buggy address belongs to the variable: [ 26.040211] nstr.44312+0x18/0x40 [ 26.043628] [ 26.045224] Memory state around the buggy address: [ 26.050121] ffffffff85343400: fa fa fa fa 00 00 00 fa fa fa fa fa 00 06 fa fa [ 26.057447] ffffffff85343480: fa fa fa fa 07 fa fa fa fa fa fa fa 05 fa fa fa [ 26.064794] >ffffffff85343500: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 fa [ 26.072117] ^ [ 26.079353] ffffffff85343580: fa fa fa fa 00 fa fa fa fa fa fa fa 07 fa fa fa [ 26.086680] ffffffff85343600: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00 [ 26.094005] ================================================================== [ 26.101331] Disabling lock debugging due to kernel taint [ 26.106744] Kernel panic - not syncing: panic_on_warn set ... [ 26.106744] [ 26.114077] CPU: 1 PID: 3091 Comm: syzkaller289632 Tainted: G B 4.15.0-rc1-next-20171201+ #57 [ 26.123918] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.133236] Call Trace: [ 26.135789] dump_stack+0x194/0x257 [ 26.139382] ? arch_local_irq_restore+0x53/0x53 [ 26.144020] ? vprintk_default+0x28/0x30 [ 26.148046] ? vsnprintf+0x1ed/0x1900 [ 26.151813] ? show_timer+0x250/0x2b0 [ 26.155578] panic+0x1e4/0x41c [ 26.158742] ? refcount_error_report+0x214/0x214 [ 26.163474] ? add_taint+0x40/0x50 [ 26.166978] ? add_taint+0x1c/0x50 [ 26.170490] ? show_timer+0x278/0x2b0 [ 26.174257] kasan_end_report+0x50/0x50 [ 26.178197] kasan_report+0x144/0x340 [ 26.181964] __asan_report_load8_noabort+0x14/0x20 [ 26.186858] show_timer+0x278/0x2b0 [ 26.190449] ? timers_start+0x14c/0x1c0 [ 26.194392] seq_read+0x385/0x13d0 [ 26.197905] ? seq_lseek+0x3c0/0x3c0 [ 26.201585] ? selinux_file_permission+0x82/0x460 [ 26.206392] ? security_file_permission+0x89/0x1f0 [ 26.211289] ? rw_verify_area+0xe5/0x2b0 [ 26.215318] do_iter_read+0x3db/0x5b0 [ 26.219083] ? dup_iter+0x260/0x260 [ 26.222680] vfs_readv+0x121/0x1c0 [ 26.226189] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 26.231518] ? mm_fault_error+0x2c0/0x2c0 [ 26.235630] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 26.241481] ? fget_raw+0x20/0x20 [ 26.244899] ? do_page_fault+0xee/0x720 [ 26.248847] do_preadv+0x11b/0x1a0 [ 26.252350] ? do_preadv+0x11b/0x1a0 [ 26.256029] SyS_preadv+0x30/0x40 [ 26.259449] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 26.264171] RIP: 0033:0x440209 [ 26.267327] RSP: 002b:00007fff70ef6758 EFLAGS: 00000217 ORIG_RAX: 0000000000000127 [ 26.275008] RAX: ffffffffffffffda RBX: 00007fff70ef6760 RCX: 0000000000440209 [ 26.282243] RDX: 0000000000000008 RSI: 0000000020508000 RDI: 0000000000000003 [ 26.289487] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 26.296722] R10: 0000000000000000 R11: 0000000000000217 R12: 0000000000401ad0 [ 26.303959] R13: 0000000000401b60 R14: 0000000000000000 R15: 0000000000000000 [ 26.311590] Dumping ftrace buffer: [ 26.315095] (ftrace buffer empty) [ 26.318782] Kernel Offset: disabled [ 26.322375] Rebooting in 86400 seconds..