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-kasan-gce-386-1,10.128.15.230' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 39.472279] ================================================================== [ 39.473381] BUG: KASAN: global-out-of-bounds in show_timer+0x278/0x2b0 [ 39.474258] Read of size 8 at addr ffffffff85342a38 by task syzkaller367926/3080 [ 39.475328] [ 39.475565] CPU: 0 PID: 3080 Comm: syzkaller367926 Not tainted 4.15.0-rc1+ #114 [ 39.476585] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.477805] Call Trace: [ 39.478184] dump_stack+0x194/0x257 [ 39.478677] ? arch_local_irq_restore+0x53/0x53 [ 39.479301] ? show_regs_print_info+0x65/0x65 [ 39.479903] ? seq_printf+0xb3/0xe0 [ 39.480394] ? show_timer+0x278/0x2b0 [ 39.480908] print_address_description+0x178/0x250 [ 39.481565] ? show_timer+0x278/0x2b0 [ 39.482077] kasan_report+0x25b/0x340 [ 39.482596] __asan_report_load8_noabort+0x14/0x20 [ 39.483251] show_timer+0x278/0x2b0 [ 39.483738] ? timers_start+0x14c/0x1c0 [ 39.484275] seq_read+0x385/0x13d0 [ 39.484768] ? seq_lseek+0x3c0/0x3c0 [ 39.485269] ? selinux_file_permission+0x82/0x460 [ 39.485920] ? security_file_permission+0x89/0x1f0 [ 39.486596] ? rw_verify_area+0xe5/0x2b0 [ 39.487148] do_iter_read+0x3db/0x5b0 [ 39.487662] ? iov_iter_get_pages+0x1150/0x1150 [ 39.488298] compat_readv+0x1bf/0x270 [ 39.488813] ? vfs_iter_read+0xb0/0xb0 [ 39.489348] ? fget_raw+0x20/0x20 [ 39.489839] do_compat_preadv64+0xdc/0x100 [ 39.490409] ? do_compat_preadv64+0xdc/0x100 [ 39.491004] compat_SyS_preadv+0x3b/0x50 [ 39.491549] ? compat_SyS_preadv64+0x40/0x40 [ 39.492141] do_fast_syscall_32+0x3ee/0xf9d [ 39.494788] ? do_int80_syscall_32+0x9d0/0x9d0 [ 39.499339] ? kasan_check_read+0x11/0x20 [ 39.503458] ? syscall_return_slowpath+0x550/0x550 [ 39.508361] ? SyS_rt_sigaction+0x94/0x1b0 [ 39.512570] ? lockdep_sys_exit+0x47/0xf0 [ 39.516688] ? retint_user+0x18/0x18 [ 39.520375] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.525191] entry_SYSENTER_compat+0x51/0x60 [ 39.529565] RIP: 0023:0xf7fa3c79 [ 39.532897] RSP: 002b:00000000fffdc06c EFLAGS: 00000217 ORIG_RAX: 000000000000014d [ 39.540570] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020508000 [ 39.547807] RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000000 [ 39.555042] RBP: 0000000020f6afa0 R08: 0000000000000000 R09: 0000000000000000 [ 39.562290] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 39.569527] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 39.576780] [ 39.578372] The buggy address belongs to the variable: [ 39.583617] nstr.44443+0x18/0x40 [ 39.587035] [ 39.588628] Memory state around the buggy address: [ 39.593521] ffffffff85342900: fa fa fa fa 00 06 fa fa fa fa fa fa 07 fa fa fa [ 39.600847] ffffffff85342980: fa fa fa fa 05 fa fa fa fa fa fa fa 07 fa fa fa [ 39.608170] >ffffffff85342a00: fa fa fa fa 00 00 00 fa fa fa fa fa 00 fa fa fa [ 39.615494] ^ [ 39.620650] ffffffff85342a80: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 00 [ 39.627975] ffffffff85342b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 39.635299] ================================================================== [ 39.642620] Disabling lock debugging due to kernel taint [ 39.648033] Kernel panic - not syncing: panic_on_warn set ... [ 39.648033] [ 39.655359] CPU: 0 PID: 3080 Comm: syzkaller367926 Tainted: G B 4.15.0-rc1+ #114 [ 39.664075] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 39.673391] Call Trace: [ 39.675946] dump_stack+0x194/0x257 [ 39.679541] ? arch_local_irq_restore+0x53/0x53 [ 39.684175] ? vprintk_default+0x28/0x30 [ 39.688200] ? vsnprintf+0x1ed/0x1900 [ 39.691966] ? show_timer+0x1e0/0x2b0 [ 39.695735] panic+0x1e4/0x41c [ 39.698894] ? refcount_error_report+0x214/0x214 [ 39.703615] ? add_taint+0x40/0x50 [ 39.707118] ? add_taint+0x1c/0x50 [ 39.710624] ? show_timer+0x278/0x2b0 [ 39.714390] kasan_end_report+0x50/0x50 [ 39.718330] kasan_report+0x144/0x340 [ 39.722096] __asan_report_load8_noabort+0x14/0x20 [ 39.726988] show_timer+0x278/0x2b0 [ 39.730578] ? timers_start+0x14c/0x1c0 [ 39.734529] seq_read+0x385/0x13d0 [ 39.738042] ? seq_lseek+0x3c0/0x3c0 [ 39.741722] ? selinux_file_permission+0x82/0x460 [ 39.746532] ? security_file_permission+0x89/0x1f0 [ 39.751429] ? rw_verify_area+0xe5/0x2b0 [ 39.755457] do_iter_read+0x3db/0x5b0 [ 39.759222] ? iov_iter_get_pages+0x1150/0x1150 [ 39.763860] compat_readv+0x1bf/0x270 [ 39.767626] ? vfs_iter_read+0xb0/0xb0 [ 39.771486] ? fget_raw+0x20/0x20 [ 39.774914] do_compat_preadv64+0xdc/0x100 [ 39.779114] ? do_compat_preadv64+0xdc/0x100 [ 39.783489] compat_SyS_preadv+0x3b/0x50 [ 39.787515] ? compat_SyS_preadv64+0x40/0x40 [ 39.791889] do_fast_syscall_32+0x3ee/0xf9d [ 39.796178] ? do_int80_syscall_32+0x9d0/0x9d0 [ 39.800724] ? kasan_check_read+0x11/0x20 [ 39.804840] ? syscall_return_slowpath+0x550/0x550 [ 39.809739] ? SyS_rt_sigaction+0x94/0x1b0 [ 39.813940] ? lockdep_sys_exit+0x47/0xf0 [ 39.818051] ? retint_user+0x18/0x18 [ 39.821734] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.826542] entry_SYSENTER_compat+0x51/0x60 [ 39.830915] RIP: 0023:0xf7fa3c79 [ 39.834244] RSP: 002b:00000000fffdc06c EFLAGS: 00000217 ORIG_RAX: 000000000000014d [ 39.841929] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020508000 [ 39.849164] RDX: 0000000000000008 RSI: 0000000000000000 RDI: 0000000000000000 [ 39.856400] RBP: 0000000020f6afa0 R08: 0000000000000000 R09: 0000000000000000 [ 39.863636] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 39.870870] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 39.878150] Dumping ftrace buffer: [ 39.881655] (ftrace buffer empty) [ 39.885332] Kernel Offset: disabled [ 39.888924] Rebooting in 86400 seconds..