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-9,10.128.0.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 43.961592] ================================================================== [ 43.962722] BUG: KASAN: global-out-of-bounds in show_timer+0x278/0x2b0 [ 43.963622] Read of size 8 at addr ffffffff853437f8 by task syzkaller929580/3091 [ 43.964636] [ 43.964887] CPU: 0 PID: 3091 Comm: syzkaller929580 Not tainted 4.15.0-rc2-next-20171205+ #59 [ 43.966007] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.967228] Call Trace: [ 43.967586] dump_stack+0x194/0x257 [ 43.968162] ? arch_local_irq_restore+0x53/0x53 [ 43.968788] ? show_regs_print_info+0x65/0x65 [ 43.969412] ? seq_printf+0xb3/0xe0 [ 43.969905] ? show_timer+0x278/0x2b0 [ 43.970436] print_address_description+0x178/0x250 [ 43.971109] ? show_timer+0x278/0x2b0 [ 43.971621] kasan_report+0x25b/0x340 [ 43.972136] __asan_report_load8_noabort+0x14/0x20 [ 43.972793] show_timer+0x278/0x2b0 [ 43.973281] ? timers_start+0x14c/0x1c0 [ 43.973818] traverse+0x248/0xa00 [ 43.974293] ? seq_hlist_next+0xc0/0xc0 [ 43.974839] seq_read+0x96a/0x13d0 [ 43.975334] ? seq_lseek+0x3c0/0x3c0 [ 43.975843] ? selinux_file_permission+0x82/0x460 [ 43.976495] ? security_file_permission+0x89/0x1f0 [ 43.977157] ? rw_verify_area+0xe5/0x2b0 [ 43.977707] do_iter_read+0x3db/0x5b0 [ 43.978220] ? dup_iter+0x260/0x260 [ 43.978720] vfs_readv+0x121/0x1c0 [ 43.979202] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 43.979933] ? find_held_lock+0x39/0x1d0 [ 43.980492] ? lock_downgrade+0x980/0x980 [ 43.981081] ? depot_save_stack+0x22e/0x460 [ 43.981662] ? rcutorture_record_progress+0x10/0x10 [ 43.986298] ? lock_release+0xda0/0xda0 [ 43.990241] ? is_bpf_text_address+0xa4/0x120 [ 43.994710] default_file_splice_read+0x508/0xae0 [ 43.999520] ? default_file_splice_read+0x508/0xae0 [ 44.004502] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.009494] ? do_splice_direct+0x3d0/0x3d0 [ 44.013784] ? print_usage_bug+0x3f0/0x3f0 [ 44.017987] ? save_stack+0xa3/0xd0 [ 44.021581] ? save_stack+0x43/0xd0 [ 44.025173] ? kasan_kmalloc+0xad/0xe0 [ 44.029028] ? alloc_pipe_info+0x135/0x350 [ 44.033231] ? splice_direct_to_actor+0x650/0x820 [ 44.038038] ? do_splice_direct+0x2a7/0x3d0 [ 44.042324] ? do_sendfile+0x5d5/0xe90 [ 44.046176] ? SyS_sendfile64+0xbd/0x160 [ 44.050204] ? entry_SYSCALL_64_fastpath+0x1f/0x96 [ 44.055101] ? print_usage_bug+0x3f0/0x3f0 [ 44.059305] ? __lock_is_held+0xbc/0x140 [ 44.063348] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 44.069201] ? fsnotify+0x7b3/0x1140 [ 44.072891] ? fsnotify_first_mark+0x2b0/0x2b0 [ 44.077444] ? avc_policy_seqno+0x9/0x20 [ 44.081473] ? selinux_file_permission+0x82/0x460 [ 44.086288] ? security_file_permission+0x89/0x1f0 [ 44.091188] ? do_splice_direct+0x3d0/0x3d0 [ 44.095478] do_splice_to+0x110/0x170 [ 44.099247] ? do_splice_to+0x110/0x170 [ 44.103195] splice_direct_to_actor+0x242/0x820 [ 44.107828] ? _cond_resched+0x14/0x30 [ 44.111683] ? generic_pipe_buf_nosteal+0x10/0x10 [ 44.116500] ? do_splice_to+0x170/0x170 [ 44.120439] ? security_file_permission+0x89/0x1f0 [ 44.125340] ? rw_verify_area+0xe5/0x2b0 [ 44.129372] do_splice_direct+0x2a7/0x3d0 [ 44.133498] ? splice_direct_to_actor+0x820/0x820 [ 44.138314] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 44.143049] ? __sb_start_write+0x203/0x290 [ 44.147342] do_sendfile+0x5d5/0xe90 [ 44.151038] ? do_compat_pwritev64+0x100/0x100 [ 44.155603] ? __might_sleep+0x95/0x190 [ 44.159563] ? kasan_check_write+0x14/0x20 [ 44.163767] ? _copy_from_user+0x99/0x110 [ 44.167892] SyS_sendfile64+0xbd/0x160 [ 44.171760] ? SyS_sendfile+0x1a0/0x1a0 [ 44.175700] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.180686] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 44.185418] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 44.190144] RIP: 0033:0x440149 [ 44.193303] RSP: 002b:00007ffe329cf008 EFLAGS: 00000213 ORIG_RAX: 0000000000000028 [ 44.200980] RAX: ffffffffffffffda RBX: 00007ffe329cedb0 RCX: 0000000000440149 [ 44.208217] RDX: 0000000020480ff8 RSI: 0000000000000003 RDI: 0000000000000003 [ 44.215455] RBP: 000000000000007f R08: 0000000000000011 R09: 65732f636f72702f [ 44.222695] R10: 00000000000000ff R11: 0000000000000213 R12: 00007ffe329cf010 [ 44.229938] R13: 00000000004a15b7 R14: 00007ffe329cef28 R15: 0000000000000001 [ 44.237190] [ 44.238784] The buggy address belongs to the variable: [ 44.244028] nstr.44331+0x18/0x40 [ 44.247442] [ 44.249034] Memory state around the buggy address: [ 44.253930] ffffffff85343680: fa fa fa fa 00 00 00 fa fa fa fa fa 00 06 fa fa [ 44.261266] ffffffff85343700: fa fa fa fa 07 fa fa fa fa fa fa fa 05 fa fa fa [ 44.268592] >ffffffff85343780: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 fa [ 44.275919] ^ [ 44.283161] ffffffff85343800: fa fa fa fa 00 fa fa fa fa fa fa fa 07 fa fa fa [ 44.290488] ffffffff85343880: fa fa fa fa 00 00 00 00 00 00 00 00 00 00 00 00 [ 44.297811] ================================================================== [ 44.305135] Disabling lock debugging due to kernel taint [ 44.310549] Kernel panic - not syncing: panic_on_warn set ... [ 44.310549] [ 44.317877] CPU: 0 PID: 3091 Comm: syzkaller929580 Tainted: G B 4.15.0-rc2-next-20171205+ #59 [ 44.327729] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.337047] Call Trace: [ 44.339601] dump_stack+0x194/0x257 [ 44.343194] ? arch_local_irq_restore+0x53/0x53 [ 44.347830] ? vprintk_default+0x28/0x30 [ 44.351857] ? vsnprintf+0x1ed/0x1900 [ 44.355623] ? show_timer+0x270/0x2b0 [ 44.359388] panic+0x1e4/0x41c [ 44.362547] ? refcount_error_report+0x214/0x214 [ 44.367269] ? add_taint+0x40/0x50 [ 44.370778] ? add_taint+0x1c/0x50 [ 44.374285] ? show_timer+0x278/0x2b0 [ 44.378049] kasan_end_report+0x50/0x50 [ 44.381987] kasan_report+0x144/0x340 [ 44.385757] __asan_report_load8_noabort+0x14/0x20 [ 44.390651] show_timer+0x278/0x2b0 [ 44.394242] ? timers_start+0x14c/0x1c0 [ 44.398183] traverse+0x248/0xa00 [ 44.401604] ? seq_hlist_next+0xc0/0xc0 [ 44.405547] seq_read+0x96a/0x13d0 [ 44.409060] ? seq_lseek+0x3c0/0x3c0 [ 44.412741] ? selinux_file_permission+0x82/0x460 [ 44.417550] ? security_file_permission+0x89/0x1f0 [ 44.422445] ? rw_verify_area+0xe5/0x2b0 [ 44.426473] do_iter_read+0x3db/0x5b0 [ 44.430239] ? dup_iter+0x260/0x260 [ 44.433836] vfs_readv+0x121/0x1c0 [ 44.437343] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 44.442673] ? find_held_lock+0x39/0x1d0 [ 44.446704] ? lock_downgrade+0x980/0x980 [ 44.450819] ? depot_save_stack+0x22e/0x460 [ 44.455106] ? rcutorture_record_progress+0x10/0x10 [ 44.460089] ? lock_release+0xda0/0xda0 [ 44.464029] ? is_bpf_text_address+0xa4/0x120 [ 44.468493] default_file_splice_read+0x508/0xae0 [ 44.473299] ? default_file_splice_read+0x508/0xae0 [ 44.478278] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.483261] ? do_splice_direct+0x3d0/0x3d0 [ 44.487548] ? print_usage_bug+0x3f0/0x3f0 [ 44.491746] ? save_stack+0xa3/0xd0 [ 44.495338] ? save_stack+0x43/0xd0 [ 44.498931] ? kasan_kmalloc+0xad/0xe0 [ 44.502786] ? alloc_pipe_info+0x135/0x350 [ 44.506987] ? splice_direct_to_actor+0x650/0x820 [ 44.511794] ? do_splice_direct+0x2a7/0x3d0 [ 44.516079] ? do_sendfile+0x5d5/0xe90 [ 44.519932] ? SyS_sendfile64+0xbd/0x160 [ 44.523958] ? entry_SYSCALL_64_fastpath+0x1f/0x96 [ 44.528854] ? print_usage_bug+0x3f0/0x3f0 [ 44.533054] ? __lock_is_held+0xbc/0x140 [ 44.537088] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 44.542941] ? fsnotify+0x7b3/0x1140 [ 44.546626] ? fsnotify_first_mark+0x2b0/0x2b0 [ 44.551176] ? avc_policy_seqno+0x9/0x20 [ 44.555201] ? selinux_file_permission+0x82/0x460 [ 44.560011] ? security_file_permission+0x89/0x1f0 [ 44.564909] ? do_splice_direct+0x3d0/0x3d0 [ 44.569199] do_splice_to+0x110/0x170 [ 44.572967] ? do_splice_to+0x110/0x170 [ 44.576909] splice_direct_to_actor+0x242/0x820 [ 44.581544] ? _cond_resched+0x14/0x30 [ 44.585398] ? generic_pipe_buf_nosteal+0x10/0x10 [ 44.590207] ? do_splice_to+0x170/0x170 [ 44.594147] ? security_file_permission+0x89/0x1f0 [ 44.599044] ? rw_verify_area+0xe5/0x2b0 [ 44.603072] do_splice_direct+0x2a7/0x3d0 [ 44.607187] ? splice_direct_to_actor+0x820/0x820 [ 44.611998] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 44.616720] ? __sb_start_write+0x203/0x290 [ 44.621009] do_sendfile+0x5d5/0xe90 [ 44.624692] ? do_compat_pwritev64+0x100/0x100 [ 44.629238] ? __might_sleep+0x95/0x190 [ 44.633179] ? kasan_check_write+0x14/0x20 [ 44.637379] ? _copy_from_user+0x99/0x110 [ 44.641492] SyS_sendfile64+0xbd/0x160 [ 44.645344] ? SyS_sendfile+0x1a0/0x1a0 [ 44.649283] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 44.654265] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 44.658990] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 44.663710] RIP: 0033:0x440149 [ 44.666865] RSP: 002b:00007ffe329cf008 EFLAGS: 00000213 ORIG_RAX: 0000000000000028 [ 44.674538] RAX: ffffffffffffffda RBX: 00007ffe329cedb0 RCX: 0000000000440149 [ 44.681775] RDX: 0000000020480ff8 RSI: 0000000000000003 RDI: 0000000000000003 [ 44.689021] RBP: 000000000000007f R08: 0000000000000011 R09: 65732f636f72702f [ 44.696256] R10: 00000000000000ff R11: 0000000000000213 R12: 00007ffe329cf010 [ 44.703495] R13: 00000000004a15b7 R14: 00007ffe329cef28 R15: 0000000000000001 [ 44.710774] Dumping ftrace buffer: [ 44.714283] (ftrace buffer empty) [ 44.717960] Kernel Offset: disabled [ 44.721553] Rebooting in 86400 seconds..