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-mmots-kasan-gce-0,10.128.15.207' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 28.273534] ================================================================== [ 28.274668] BUG: KASAN: global-out-of-bounds in show_timer+0x278/0x2b0 [ 28.275565] Read of size 8 at addr ffffffff85343838 by task syzkaller071653/3079 [ 28.276569] [ 28.276800] CPU: 0 PID: 3079 Comm: syzkaller071653 Not tainted 4.15.0-rc1-mm1+ #29 [ 28.277807] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.279084] Call Trace: [ 28.279475] dump_stack+0x194/0x257 [ 28.279983] ? arch_local_irq_restore+0x53/0x53 [ 28.280621] ? show_regs_print_info+0x65/0x65 [ 28.281241] ? seq_printf+0xb3/0xe0 [ 28.281730] ? show_timer+0x278/0x2b0 [ 28.282254] print_address_description+0x178/0x250 [ 28.282911] ? show_timer+0x278/0x2b0 [ 28.283421] kasan_report+0x25b/0x340 [ 28.283935] __asan_report_load8_noabort+0x14/0x20 [ 28.284605] show_timer+0x278/0x2b0 [ 28.285090] ? timers_start+0x14c/0x1c0 [ 28.285626] traverse+0x248/0xa00 [ 28.286101] ? seq_hlist_next+0xc0/0xc0 [ 28.286645] seq_read+0x96a/0x13d0 [ 28.287138] ? seq_lseek+0x3c0/0x3c0 [ 28.287637] ? selinux_file_permission+0x82/0x460 [ 28.288303] ? security_file_permission+0x89/0x1f0 [ 28.288978] ? rw_verify_area+0xe5/0x2b0 [ 28.289525] do_iter_read+0x3db/0x5b0 [ 28.290049] ? dup_iter+0x260/0x260 [ 28.290547] vfs_readv+0x121/0x1c0 [ 28.291024] ? may_open_dev+0xe0/0xe0 [ 28.291537] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 28.292252] ? mm_fault_error+0x2c0/0x2c0 [ 28.292813] ? fget_raw+0x20/0x20 [ 28.293280] ? do_page_fault+0xee/0x720 [ 28.293816] ? putname+0xf3/0x130 [ 28.297238] ? do_sys_open+0x320/0x6d0 [ 28.301100] do_preadv+0x11b/0x1a0 [ 28.304606] ? do_preadv+0x11b/0x1a0 [ 28.308291] SyS_preadv+0x30/0x40 [ 28.311716] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 28.316436] RIP: 0033:0x440159 [ 28.319592] RSP: 002b:00007ffeb511e2e8 EFLAGS: 00000213 ORIG_RAX: 0000000000000127 [ 28.327266] RAX: ffffffffffffffda RBX: 00007ffeb511e2f0 RCX: 0000000000440159 [ 28.334502] RDX: 0000000000000001 RSI: 00000000205e2ff0 RDI: 0000000000000003 [ 28.341737] RBP: 0000000000000000 R08: 0000000000000011 R09: 65732f636f72702f [ 28.348974] R10: 0001000000000000 R11: 0000000000000213 R12: 0000000000401a20 [ 28.356211] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 28.364242] [ 28.365832] The buggy address belongs to the variable: [ 28.371071] nstr.44309+0x18/0x40 [ 28.374484] [ 28.376075] Memory state around the buggy address: [ 28.380968] ffffffff85343700: fa fa fa fa 00 06 fa fa fa fa fa fa 07 fa fa fa [ 28.388299] ffffffff85343780: fa fa fa fa 05 fa fa fa fa fa fa fa 07 fa fa fa [ 28.395623] >ffffffff85343800: fa fa fa fa 00 00 00 fa fa fa fa fa 00 fa fa fa [ 28.402947] ^ [ 28.408100] ffffffff85343880: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 00 [ 28.415422] ffffffff85343900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 28.423264] ================================================================== [ 28.430759] Disabling lock debugging due to kernel taint [ 28.436171] Kernel panic - not syncing: panic_on_warn set ... [ 28.436171] [ 28.443496] CPU: 0 PID: 3079 Comm: syzkaller071653 Tainted: G B 4.15.0-rc1-mm1+ #29 [ 28.452465] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.461783] Call Trace: [ 28.464343] dump_stack+0x194/0x257 [ 28.467938] ? arch_local_irq_restore+0x53/0x53 [ 28.472570] ? vprintk_default+0x28/0x30 [ 28.476594] ? vsnprintf+0x1ed/0x1900 [ 28.480359] ? show_timer+0x1c0/0x2b0 [ 28.484122] panic+0x1e4/0x41c [ 28.487278] ? refcount_error_report+0x214/0x214 [ 28.491999] ? add_taint+0x40/0x50 [ 28.495501] ? add_taint+0x1c/0x50 [ 28.499005] ? show_timer+0x278/0x2b0 [ 28.502772] kasan_end_report+0x50/0x50 [ 28.506709] kasan_report+0x144/0x340 [ 28.510474] __asan_report_load8_noabort+0x14/0x20 [ 28.515364] show_timer+0x278/0x2b0 [ 28.518955] ? timers_start+0x14c/0x1c0 [ 28.522895] traverse+0x248/0xa00 [ 28.526316] ? seq_hlist_next+0xc0/0xc0 [ 28.530259] seq_read+0x96a/0x13d0 [ 28.533771] ? seq_lseek+0x3c0/0x3c0 [ 28.537447] ? selinux_file_permission+0x82/0x460 [ 28.542254] ? security_file_permission+0x89/0x1f0 [ 28.547148] ? rw_verify_area+0xe5/0x2b0 [ 28.551173] do_iter_read+0x3db/0x5b0 [ 28.554937] ? dup_iter+0x260/0x260 [ 28.558534] vfs_readv+0x121/0x1c0 [ 28.562037] ? may_open_dev+0xe0/0xe0 [ 28.565803] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 28.571131] ? mm_fault_error+0x2c0/0x2c0 [ 28.575247] ? fget_raw+0x20/0x20 [ 28.578664] ? do_page_fault+0xee/0x720 [ 28.582607] ? putname+0xf3/0x130 [ 28.586027] ? do_sys_open+0x320/0x6d0 [ 28.589883] do_preadv+0x11b/0x1a0 [ 28.593384] ? do_preadv+0x11b/0x1a0 [ 28.597062] SyS_preadv+0x30/0x40 [ 28.600481] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 28.605198] RIP: 0033:0x440159 [ 28.608350] RSP: 002b:00007ffeb511e2e8 EFLAGS: 00000213 ORIG_RAX: 0000000000000127 [ 28.616023] RAX: ffffffffffffffda RBX: 00007ffeb511e2f0 RCX: 0000000000440159 [ 28.623259] RDX: 0000000000000001 RSI: 00000000205e2ff0 RDI: 0000000000000003 [ 28.630496] RBP: 0000000000000000 R08: 0000000000000011 R09: 65732f636f72702f [ 28.637739] R10: 0001000000000000 R11: 0000000000000213 R12: 0000000000401a20 [ 28.644971] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 28.652246] Dumping ftrace buffer: [ 28.655749] (ftrace buffer empty) [ 28.659424] Kernel Offset: disabled [ 28.663015] Rebooting in 86400 seconds..