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-4,10.128.0.15' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 25.945042] ================================================================== [ 25.946156] BUG: KASAN: global-out-of-bounds in show_timer+0x278/0x2b0 [ 25.947033] Read of size 8 at addr ffffffff85342a38 by task syzkaller541763/3078 [ 25.948017] [ 25.948254] CPU: 1 PID: 3078 Comm: syzkaller541763 Not tainted 4.15.0-rc2+ #206 [ 25.949230] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.950451] Call Trace: [ 25.950811] dump_stack+0x194/0x257 [ 25.951304] ? arch_local_irq_restore+0x53/0x53 [ 25.951980] ? show_regs_print_info+0x65/0x65 [ 25.952603] ? seq_printf+0xb3/0xe0 [ 25.953092] ? show_timer+0x278/0x2b0 [ 25.953605] print_address_description+0x178/0x250 [ 25.954261] ? show_timer+0x278/0x2b0 [ 25.954772] kasan_report+0x25b/0x340 [ 25.955287] __asan_report_load8_noabort+0x14/0x20 [ 25.955957] show_timer+0x278/0x2b0 [ 25.956445] ? timers_start+0x14c/0x1c0 [ 25.956979] traverse+0x248/0xa00 [ 25.957452] ? seq_hlist_next+0xc0/0xc0 [ 25.957997] seq_read+0x96a/0x13d0 [ 25.958489] ? seq_lseek+0x3c0/0x3c0 [ 25.958988] ? selinux_file_permission+0x82/0x460 [ 25.959637] ? security_file_permission+0x89/0x1f0 [ 25.960296] ? rw_verify_area+0xe5/0x2b0 [ 25.960844] do_iter_read+0x3db/0x5b0 [ 25.961356] ? dup_iter+0x260/0x260 [ 25.961857] vfs_readv+0x121/0x1c0 [ 25.962338] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 25.963047] ? find_held_lock+0x39/0x1d0 [ 25.963601] ? lock_downgrade+0x980/0x980 [ 25.964165] ? lock_release+0xda0/0xda0 [ 25.964709] default_file_splice_read+0x508/0xae0 [ 25.966522] ? default_file_splice_read+0x508/0xae0 [ 25.971524] ? do_splice_direct+0x3d0/0x3d0 [ 25.975815] ? print_usage_bug+0x3f0/0x3f0 [ 25.980014] ? save_stack+0xa3/0xd0 [ 25.983609] ? save_stack+0x43/0xd0 [ 25.987202] ? kasan_kmalloc+0xad/0xe0 [ 25.991055] ? alloc_pipe_info+0x135/0x350 [ 25.995258] ? splice_direct_to_actor+0x650/0x820 [ 26.000067] ? do_splice_direct+0x2a7/0x3d0 [ 26.004352] ? do_sendfile+0x5d5/0xe90 [ 26.008202] ? SyS_sendfile64+0xbd/0x160 [ 26.012227] ? entry_SYSCALL_64_fastpath+0x1f/0x96 [ 26.017126] ? print_usage_bug+0x3f0/0x3f0 [ 26.021332] ? __lock_is_held+0xbc/0x140 [ 26.025373] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 26.031227] ? fsnotify+0x7b3/0x1140 [ 26.034918] ? fsnotify_first_mark+0x2b0/0x2b0 [ 26.039471] ? avc_policy_seqno+0x9/0x20 [ 26.043499] ? selinux_file_permission+0x82/0x460 [ 26.048314] ? security_file_permission+0x89/0x1f0 [ 26.053214] ? do_splice_direct+0x3d0/0x3d0 [ 26.057504] do_splice_to+0x110/0x170 [ 26.061282] ? do_splice_to+0x110/0x170 [ 26.065228] splice_direct_to_actor+0x242/0x820 [ 26.069864] ? _cond_resched+0x14/0x30 [ 26.073726] ? generic_pipe_buf_nosteal+0x10/0x10 [ 26.078542] ? do_splice_to+0x170/0x170 [ 26.082499] ? security_file_permission+0x89/0x1f0 [ 26.087402] ? rw_verify_area+0xe5/0x2b0 [ 26.091437] do_splice_direct+0x2a7/0x3d0 [ 26.095553] ? splice_direct_to_actor+0x820/0x820 [ 26.100370] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 26.105094] ? __sb_start_write+0x203/0x290 [ 26.109386] do_sendfile+0x5d5/0xe90 [ 26.113074] ? do_compat_pwritev64+0x100/0x100 [ 26.117627] ? __might_sleep+0x95/0x190 [ 26.121574] ? kasan_check_write+0x14/0x20 [ 26.125777] ? _copy_from_user+0x99/0x110 [ 26.129894] SyS_sendfile64+0xbd/0x160 [ 26.133751] ? SyS_sendfile+0x1a0/0x1a0 [ 26.137692] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.142680] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.147414] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 26.152140] RIP: 0033:0x440149 [ 26.155308] RSP: 002b:00007ffdca5bb698 EFLAGS: 00000213 ORIG_RAX: 0000000000000028 [ 26.162986] RAX: ffffffffffffffda RBX: 00007ffdca5bb440 RCX: 0000000000440149 [ 26.170227] RDX: 0000000020480ff8 RSI: 0000000000000003 RDI: 0000000000000003 [ 26.177467] RBP: 000000000000007f R08: 0000000000000011 R09: 65732f636f72702f [ 26.184705] R10: 00000000000000ff R11: 0000000000000213 R12: 00007ffdca5bb6a0 [ 26.191947] R13: 00000000004a15b7 R14: 00007ffdca5bb5b8 R15: 0000000000000001 [ 26.199200] [ 26.200793] The buggy address belongs to the variable: [ 26.206038] nstr.44443+0x18/0x40 [ 26.209453] [ 26.211044] Memory state around the buggy address: [ 26.215939] ffffffff85342900: fa fa fa fa 00 06 fa fa fa fa fa fa 07 fa fa fa [ 26.223263] ffffffff85342980: fa fa fa fa 05 fa fa fa fa fa fa fa 07 fa fa fa [ 26.230594] >ffffffff85342a00: fa fa fa fa 00 00 00 fa fa fa fa fa 00 fa fa fa [ 26.237929] ^ [ 26.243086] ffffffff85342a80: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 00 [ 26.250411] ffffffff85342b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 26.257737] ================================================================== [ 26.265060] Disabling lock debugging due to kernel taint [ 26.270481] Kernel panic - not syncing: panic_on_warn set ... [ 26.270481] [ 26.277819] CPU: 1 PID: 3078 Comm: syzkaller541763 Tainted: G B 4.15.0-rc2+ #206 [ 26.286532] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.295861] Call Trace: [ 26.298419] dump_stack+0x194/0x257 [ 26.302017] ? arch_local_irq_restore+0x53/0x53 [ 26.306656] ? vprintk_default+0x28/0x30 [ 26.310682] ? vsnprintf+0x1ed/0x1900 [ 26.314451] ? show_timer+0x1e0/0x2b0 [ 26.318217] panic+0x1e4/0x41c [ 26.321377] ? refcount_error_report+0x214/0x214 [ 26.326099] ? add_taint+0x40/0x50 [ 26.329602] ? add_taint+0x1c/0x50 [ 26.333106] ? show_timer+0x278/0x2b0 [ 26.336874] kasan_end_report+0x50/0x50 [ 26.340811] kasan_report+0x144/0x340 [ 26.344577] __asan_report_load8_noabort+0x14/0x20 [ 26.349478] show_timer+0x278/0x2b0 [ 26.353068] ? timers_start+0x14c/0x1c0 [ 26.357009] traverse+0x248/0xa00 [ 26.360431] ? seq_hlist_next+0xc0/0xc0 [ 26.364373] seq_read+0x96a/0x13d0 [ 26.367886] ? seq_lseek+0x3c0/0x3c0 [ 26.371568] ? selinux_file_permission+0x82/0x460 [ 26.376381] ? security_file_permission+0x89/0x1f0 [ 26.381279] ? rw_verify_area+0xe5/0x2b0 [ 26.385306] do_iter_read+0x3db/0x5b0 [ 26.389073] ? dup_iter+0x260/0x260 [ 26.392667] vfs_readv+0x121/0x1c0 [ 26.396172] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 26.401500] ? find_held_lock+0x39/0x1d0 [ 26.405531] ? lock_downgrade+0x980/0x980 [ 26.409648] ? lock_release+0xda0/0xda0 [ 26.413596] default_file_splice_read+0x508/0xae0 [ 26.418405] ? default_file_splice_read+0x508/0xae0 [ 26.423394] ? do_splice_direct+0x3d0/0x3d0 [ 26.427678] ? print_usage_bug+0x3f0/0x3f0 [ 26.431880] ? save_stack+0xa3/0xd0 [ 26.435472] ? save_stack+0x43/0xd0 [ 26.439061] ? kasan_kmalloc+0xad/0xe0 [ 26.442912] ? alloc_pipe_info+0x135/0x350 [ 26.447110] ? splice_direct_to_actor+0x650/0x820 [ 26.451916] ? do_splice_direct+0x2a7/0x3d0 [ 26.456214] ? do_sendfile+0x5d5/0xe90 [ 26.460072] ? SyS_sendfile64+0xbd/0x160 [ 26.464099] ? entry_SYSCALL_64_fastpath+0x1f/0x96 [ 26.468997] ? print_usage_bug+0x3f0/0x3f0 [ 26.473208] ? __lock_is_held+0xbc/0x140 [ 26.477243] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 26.483103] ? fsnotify+0x7b3/0x1140 [ 26.486794] ? fsnotify_first_mark+0x2b0/0x2b0 [ 26.491344] ? avc_policy_seqno+0x9/0x20 [ 26.495370] ? selinux_file_permission+0x82/0x460 [ 26.500179] ? security_file_permission+0x89/0x1f0 [ 26.505076] ? do_splice_direct+0x3d0/0x3d0 [ 26.509371] do_splice_to+0x110/0x170 [ 26.513139] ? do_splice_to+0x110/0x170 [ 26.517088] splice_direct_to_actor+0x242/0x820 [ 26.521722] ? _cond_resched+0x14/0x30 [ 26.525575] ? generic_pipe_buf_nosteal+0x10/0x10 [ 26.530387] ? do_splice_to+0x170/0x170 [ 26.534328] ? security_file_permission+0x89/0x1f0 [ 26.539225] ? rw_verify_area+0xe5/0x2b0 [ 26.543254] do_splice_direct+0x2a7/0x3d0 [ 26.547368] ? splice_direct_to_actor+0x820/0x820 [ 26.552177] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 26.556899] ? __sb_start_write+0x203/0x290 [ 26.561186] do_sendfile+0x5d5/0xe90 [ 26.564871] ? do_compat_pwritev64+0x100/0x100 [ 26.569418] ? __might_sleep+0x95/0x190 [ 26.573361] ? kasan_check_write+0x14/0x20 [ 26.577561] ? _copy_from_user+0x99/0x110 [ 26.581682] SyS_sendfile64+0xbd/0x160 [ 26.585546] ? SyS_sendfile+0x1a0/0x1a0 [ 26.589486] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.594469] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.599194] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 26.603914] RIP: 0033:0x440149 [ 26.607069] RSP: 002b:00007ffdca5bb698 EFLAGS: 00000213 ORIG_RAX: 0000000000000028 [ 26.614745] RAX: ffffffffffffffda RBX: 00007ffdca5bb440 RCX: 0000000000440149 [ 26.621993] RDX: 0000000020480ff8 RSI: 0000000000000003 RDI: 0000000000000003 [ 26.629239] RBP: 000000000000007f R08: 0000000000000011 R09: 65732f636f72702f [ 26.636475] R10: 00000000000000ff R11: 0000000000000213 R12: 00007ffdca5bb6a0 [ 26.643711] R13: 00000000004a15b7 R14: 00007ffdca5bb5b8 R15: 0000000000000001 [ 26.650996] Dumping ftrace buffer: [ 26.654501] (ftrace buffer empty) [ 26.658177] Kernel Offset: disabled [ 26.661772] Rebooting in 86400 seconds..