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-1,10.128.15.210' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 19.811983] ================================================================== [ 19.813063] BUG: KASAN: global-out-of-bounds in show_timer+0x278/0x2b0 [ 19.813941] Read of size 8 at addr ffffffff85342a38 by task syzkaller682370/3080 [ 19.814952] [ 19.815184] CPU: 0 PID: 3080 Comm: syzkaller682370 Not tainted 4.15.0-rc1+ #205 [ 19.816178] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 19.817396] Call Trace: [ 19.817752] dump_stack+0x194/0x257 [ 19.818247] ? arch_local_irq_restore+0x53/0x53 [ 19.818963] ? show_regs_print_info+0x65/0x65 [ 19.819586] ? seq_printf+0xb3/0xe0 [ 19.820084] ? show_timer+0x278/0x2b0 [ 19.820598] print_address_description+0x178/0x250 [ 19.821269] ? show_timer+0x278/0x2b0 [ 19.821779] kasan_report+0x25b/0x340 [ 19.822295] __asan_report_load8_noabort+0x14/0x20 [ 19.822948] show_timer+0x278/0x2b0 [ 19.823435] ? timers_start+0x14c/0x1c0 [ 19.823970] traverse+0x248/0xa00 [ 19.824512] ? seq_hlist_next+0xc0/0xc0 [ 19.825056] seq_read+0x96a/0x13d0 [ 19.825550] ? seq_lseek+0x3c0/0x3c0 [ 19.826050] ? selinux_file_permission+0x82/0x460 [ 19.826697] ? security_file_permission+0x89/0x1f0 [ 19.827356] ? rw_verify_area+0xe5/0x2b0 [ 19.827904] do_iter_read+0x3db/0x5b0 [ 19.828420] ? dup_iter+0x260/0x260 [ 19.828918] vfs_readv+0x121/0x1c0 [ 19.829396] ? may_open_dev+0xe0/0xe0 [ 19.829929] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 19.830671] ? mm_fault_error+0x2c0/0x2c0 [ 19.831254] ? fget_raw+0x20/0x20 [ 19.831722] ? do_page_fault+0xee/0x720 [ 19.833279] ? putname+0xf3/0x130 [ 19.836702] ? do_sys_open+0x320/0x6d0 [ 19.840563] do_preadv+0x11b/0x1a0 [ 19.844075] ? do_preadv+0x11b/0x1a0 [ 19.847770] SyS_preadv+0x30/0x40 [ 19.851202] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 19.855927] RIP: 0033:0x440159 [ 19.859082] RSP: 002b:00007ffef462a888 EFLAGS: 00000213 ORIG_RAX: 0000000000000127 [ 19.866757] RAX: ffffffffffffffda RBX: 00007ffef462a890 RCX: 0000000000440159 [ 19.873996] RDX: 0000000000000001 RSI: 00000000205e2ff0 RDI: 0000000000000003 [ 19.882886] RBP: 0000000000000000 R08: 0000000000000011 R09: 65732f636f72702f [ 19.890562] R10: 0001000000000000 R11: 0000000000000213 R12: 0000000000401a20 [ 19.897801] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 19.905057] [ 19.906649] The buggy address belongs to the variable: [ 19.912156] nstr.44443+0x18/0x40 [ 19.916960] [ 19.918900] Memory state around the buggy address: [ 19.924065] ffffffff85342900: fa fa fa fa 00 06 fa fa fa fa fa fa 07 fa fa fa [ 19.931393] ffffffff85342980: fa fa fa fa 05 fa fa fa fa fa fa fa 07 fa fa fa [ 19.938725] >ffffffff85342a00: fa fa fa fa 00 00 00 fa fa fa fa fa 00 fa fa fa [ 19.946048] ^ [ 19.951205] ffffffff85342a80: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 00 [ 19.959225] ffffffff85342b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 19.966547] ================================================================== [ 19.973870] Disabling lock debugging due to kernel taint [ 19.979285] Kernel panic - not syncing: panic_on_warn set ... [ 19.979285] [ 19.986613] CPU: 0 PID: 3080 Comm: syzkaller682370 Tainted: G B 4.15.0-rc1+ #205 [ 19.995322] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.004640] Call Trace: [ 20.007197] dump_stack+0x194/0x257 [ 20.010793] ? arch_local_irq_restore+0x53/0x53 [ 20.015432] ? vprintk_default+0x28/0x30 [ 20.019458] ? vsnprintf+0x1ed/0x1900 [ 20.023230] ? show_timer+0x1e0/0x2b0 [ 20.026999] panic+0x1e4/0x41c [ 20.030161] ? refcount_error_report+0x214/0x214 [ 20.034884] ? add_taint+0x40/0x50 [ 20.038396] ? add_taint+0x1c/0x50 [ 20.041912] ? show_timer+0x278/0x2b0 [ 20.045681] kasan_end_report+0x50/0x50 [ 20.049620] kasan_report+0x144/0x340 [ 20.053391] __asan_report_load8_noabort+0x14/0x20 [ 20.058285] show_timer+0x278/0x2b0 [ 20.061877] ? timers_start+0x14c/0x1c0 [ 20.065820] traverse+0x248/0xa00 [ 20.069247] ? seq_hlist_next+0xc0/0xc0 [ 20.073190] seq_read+0x96a/0x13d0 [ 20.076703] ? seq_lseek+0x3c0/0x3c0 [ 20.080382] ? selinux_file_permission+0x82/0x460 [ 20.085199] ? security_file_permission+0x89/0x1f0 [ 20.090097] ? rw_verify_area+0xe5/0x2b0 [ 20.094129] do_iter_read+0x3db/0x5b0 [ 20.097897] ? dup_iter+0x260/0x260 [ 20.101493] vfs_readv+0x121/0x1c0 [ 20.105001] ? may_open_dev+0xe0/0xe0 [ 20.108771] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 20.114103] ? mm_fault_error+0x2c0/0x2c0 [ 20.118222] ? fget_raw+0x20/0x20 [ 20.121640] ? do_page_fault+0xee/0x720 [ 20.125580] ? putname+0xf3/0x130 [ 20.128999] ? do_sys_open+0x320/0x6d0 [ 20.132856] do_preadv+0x11b/0x1a0 [ 20.136360] ? do_preadv+0x11b/0x1a0 [ 20.140049] SyS_preadv+0x30/0x40 [ 20.143471] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 20.148192] RIP: 0033:0x440159 [ 20.151345] RSP: 002b:00007ffef462a888 EFLAGS: 00000213 ORIG_RAX: 0000000000000127 [ 20.159018] RAX: ffffffffffffffda RBX: 00007ffef462a890 RCX: 0000000000440159 [ 20.166253] RDX: 0000000000000001 RSI: 00000000205e2ff0 RDI: 0000000000000003 [ 20.173488] RBP: 0000000000000000 R08: 0000000000000011 R09: 65732f636f72702f [ 20.180722] R10: 0001000000000000 R11: 0000000000000213 R12: 0000000000401a20 [ 20.187959] R13: 0000000000401ab0 R14: 0000000000000000 R15: 0000000000000000 [ 20.195945] Dumping ftrace buffer: [ 20.199455] (ftrace buffer empty) [ 20.204173] Kernel Offset: disabled [ 20.208286] Rebooting in 86400 seconds..