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-6,10.128.0.2' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.580856] ================================================================== [ 32.582013] BUG: KASAN: global-out-of-bounds in show_timer+0x278/0x2b0 [ 32.582890] Read of size 8 at addr ffffffff85343838 by task syzkaller177858/3081 [ 32.583875] [ 32.584110] CPU: 0 PID: 3081 Comm: syzkaller177858 Not tainted 4.15.0-rc2-next-20171204+ #58 [ 32.585230] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.586452] Call Trace: [ 32.586813] dump_stack+0x194/0x257 [ 32.587306] ? arch_local_irq_restore+0x53/0x53 [ 32.587942] ? show_regs_print_info+0x65/0x65 [ 32.588547] ? seq_printf+0xb3/0xe0 [ 32.589039] ? show_timer+0x278/0x2b0 [ 32.589565] print_address_description+0x178/0x250 [ 32.590220] ? show_timer+0x278/0x2b0 [ 32.590734] kasan_report+0x25b/0x340 [ 32.591252] __asan_report_load8_noabort+0x14/0x20 [ 32.591906] show_timer+0x278/0x2b0 [ 32.592394] ? timers_start+0x14c/0x1c0 [ 32.592950] traverse+0x248/0xa00 [ 32.593424] ? seq_hlist_next+0xc0/0xc0 [ 32.593967] seq_read+0x96a/0x13d0 [ 32.594460] ? seq_lseek+0x3c0/0x3c0 [ 32.594984] ? selinux_file_permission+0x82/0x460 [ 32.595652] ? security_file_permission+0x89/0x1f0 [ 32.596312] ? rw_verify_area+0xe5/0x2b0 [ 32.596859] do_iter_read+0x3db/0x5b0 [ 32.597372] ? dup_iter+0x260/0x260 [ 32.597873] vfs_readv+0x121/0x1c0 [ 32.598353] ? may_open_dev+0xe0/0xe0 [ 32.598884] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 32.599601] ? mm_fault_error+0x2c0/0x2c0 [ 32.600165] ? fget_raw+0x20/0x20 [ 32.600634] ? do_page_fault+0xee/0x720 [ 32.601190] ? putname+0xf3/0x130 [ 32.604617] ? do_sys_open+0x320/0x6d0 [ 32.608478] do_preadv+0x11b/0x1a0 [ 32.611985] ? do_preadv+0x11b/0x1a0 [ 32.615672] SyS_preadv+0x30/0x40 [ 32.619099] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 32.623820] RIP: 0033:0x440159 [ 32.626976] RSP: 002b:00007ffd204d4ef8 EFLAGS: 00000213 ORIG_RAX: 0000000000000127 [ 32.634650] RAX: ffffffffffffffda RBX: 00007ffd204d4f00 RCX: 0000000000440159 [ 32.641886] RDX: 0000000000000001 RSI: 00000000205e2ff0 RDI: 0000000000000003 [ 32.649123] RBP: 0000000000000000 R08: 0000000000000011 R09: 65732f636f72702f [ 32.656363] R10: 0001000000000000 R11: 0000000000000213 R12: 0000000000401a20 [ 32.663601] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 32.670857] [ 32.672453] The buggy address belongs to the variable: [ 32.677696] nstr.44327+0x18/0x40 [ 32.681111] [ 32.682703] Memory state around the buggy address: [ 32.687600] ffffffff85343700: fa fa fa fa 00 06 fa fa fa fa fa fa 07 fa fa fa [ 32.695232] ffffffff85343780: fa fa fa fa 05 fa fa fa fa fa fa fa 07 fa fa fa [ 32.702568] >ffffffff85343800: fa fa fa fa 00 00 00 fa fa fa fa fa 00 fa fa fa [ 32.709892] ^ [ 32.715056] ffffffff85343880: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 00 [ 32.722379] ffffffff85343900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 32.729700] ================================================================== [ 32.737023] Disabling lock debugging due to kernel taint [ 32.742436] Kernel panic - not syncing: panic_on_warn set ... [ 32.742436] [ 32.749764] CPU: 0 PID: 3081 Comm: syzkaller177858 Tainted: G B 4.15.0-rc2-next-20171204+ #58 [ 32.759604] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.768923] Call Trace: [ 32.771485] dump_stack+0x194/0x257 [ 32.775080] ? arch_local_irq_restore+0x53/0x53 [ 32.779718] ? vprintk_default+0x28/0x30 [ 32.783746] ? vsnprintf+0x1ed/0x1900 [ 32.787514] ? show_timer+0x1b0/0x2b0 [ 32.791283] panic+0x1e4/0x41c [ 32.794440] ? refcount_error_report+0x214/0x214 [ 32.799163] ? add_taint+0x40/0x50 [ 32.802678] ? add_taint+0x1c/0x50 [ 32.806184] ? show_timer+0x278/0x2b0 [ 32.809951] kasan_end_report+0x50/0x50 [ 32.813899] kasan_report+0x144/0x340 [ 32.817667] __asan_report_load8_noabort+0x14/0x20 [ 32.822561] show_timer+0x278/0x2b0 [ 32.826151] ? timers_start+0x14c/0x1c0 [ 32.830094] traverse+0x248/0xa00 [ 32.833516] ? seq_hlist_next+0xc0/0xc0 [ 32.837460] seq_read+0x96a/0x13d0 [ 32.840972] ? seq_lseek+0x3c0/0x3c0 [ 32.844654] ? selinux_file_permission+0x82/0x460 [ 32.849463] ? security_file_permission+0x89/0x1f0 [ 32.854360] ? rw_verify_area+0xe5/0x2b0 [ 32.858390] do_iter_read+0x3db/0x5b0 [ 32.862157] ? dup_iter+0x260/0x260 [ 32.865752] vfs_readv+0x121/0x1c0 [ 32.869260] ? may_open_dev+0xe0/0xe0 [ 32.873026] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 32.878359] ? mm_fault_error+0x2c0/0x2c0 [ 32.882476] ? fget_raw+0x20/0x20 [ 32.885894] ? do_page_fault+0xee/0x720 [ 32.889836] ? putname+0xf3/0x130 [ 32.893259] ? do_sys_open+0x320/0x6d0 [ 32.897113] do_preadv+0x11b/0x1a0 [ 32.900618] ? do_preadv+0x11b/0x1a0 [ 32.904298] SyS_preadv+0x30/0x40 [ 32.907720] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 32.912439] RIP: 0033:0x440159 [ 32.915594] RSP: 002b:00007ffd204d4ef8 EFLAGS: 00000213 ORIG_RAX: 0000000000000127 [ 32.923269] RAX: ffffffffffffffda RBX: 00007ffd204d4f00 RCX: 0000000000440159 [ 32.930504] RDX: 0000000000000001 RSI: 00000000205e2ff0 RDI: 0000000000000003 [ 32.937739] RBP: 0000000000000000 R08: 0000000000000011 R09: 65732f636f72702f [ 32.944973] R10: 0001000000000000 R11: 0000000000000213 R12: 0000000000401a20 [ 32.952210] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 32.959838] Dumping ftrace buffer: [ 32.963342] (ftrace buffer empty) [ 32.967017] Kernel Offset: disabled [ 32.970609] Rebooting in 86400 seconds..