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-386-1,10.128.15.228' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 26.510240] ================================================================== [ 26.511330] BUG: KASAN: global-out-of-bounds in show_timer+0x278/0x2b0 [ 26.512206] Read of size 8 at addr ffffffff85342a38 by task syzkaller248656/3079 [ 26.513193] [ 26.513424] CPU: 0 PID: 3079 Comm: syzkaller248656 Not tainted 4.15.0-rc1+ #115 [ 26.514397] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.515615] Call Trace: [ 26.515973] dump_stack+0x194/0x257 [ 26.516463] ? arch_local_irq_restore+0x53/0x53 [ 26.517086] ? show_regs_print_info+0x65/0x65 [ 26.517688] ? seq_printf+0xb3/0xe0 [ 26.518177] ? show_timer+0x278/0x2b0 [ 26.518688] print_address_description+0x178/0x250 [ 26.519342] ? show_timer+0x278/0x2b0 [ 26.519853] kasan_report+0x25b/0x340 [ 26.520383] __asan_report_load8_noabort+0x14/0x20 [ 26.521038] show_timer+0x278/0x2b0 [ 26.521549] ? timers_start+0x14c/0x1c0 [ 26.522083] traverse+0x248/0xa00 [ 26.522557] ? seq_hlist_next+0xc0/0xc0 [ 26.523100] seq_read+0x96a/0x13d0 [ 26.523593] ? seq_lseek+0x3c0/0x3c0 [ 26.524091] ? selinux_file_permission+0x82/0x460 [ 26.524740] ? security_file_permission+0x89/0x1f0 [ 26.525398] ? rw_verify_area+0xe5/0x2b0 [ 26.525944] do_iter_read+0x3db/0x5b0 [ 26.526456] ? dup_iter+0x260/0x260 [ 26.526953] vfs_readv+0x121/0x1c0 [ 26.527434] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 26.528150] ? print_usage_bug+0x3f0/0x3f0 [ 26.528719] ? lock_downgrade+0x980/0x980 [ 26.529278] ? depot_save_stack+0x1c2/0x490 [ 26.529864] ? lock_release+0xda0/0xda0 [ 26.530404] ? mark_held_locks+0xb2/0x100 [ 26.534525] default_file_splice_read+0x508/0xae0 [ 26.539338] ? default_file_splice_read+0x508/0xae0 [ 26.544324] ? trace_hardirqs_on+0xd/0x10 [ 26.548451] ? do_splice_direct+0x3d0/0x3d0 [ 26.552739] ? print_usage_bug+0x3f0/0x3f0 [ 26.556941] ? save_stack+0xa3/0xd0 [ 26.560546] ? save_stack+0x43/0xd0 [ 26.564138] ? kasan_kmalloc+0xad/0xe0 [ 26.567991] ? __kmalloc+0x162/0x760 [ 26.571691] ? splice_direct_to_actor+0x650/0x820 [ 26.576506] ? do_splice_direct+0x2a7/0x3d0 [ 26.580793] ? do_sendfile+0x5d5/0xe90 [ 26.584653] ? compat_SyS_sendfile+0xea/0x1a0 [ 26.589116] ? do_fast_syscall_32+0x3ee/0xf9d [ 26.593580] ? print_usage_bug+0x3f0/0x3f0 [ 26.597787] ? __lock_is_held+0xbc/0x140 [ 26.601834] ? fsnotify+0x7b3/0x1140 [ 26.605532] ? fsnotify_first_mark+0x2b0/0x2b0 [ 26.610086] ? avc_policy_seqno+0x9/0x20 [ 26.614115] ? selinux_file_permission+0x82/0x460 [ 26.618930] ? security_file_permission+0x89/0x1f0 [ 26.623834] ? do_splice_direct+0x3d0/0x3d0 [ 26.628126] do_splice_to+0x110/0x170 [ 26.631893] ? do_splice_to+0x110/0x170 [ 26.635840] splice_direct_to_actor+0x242/0x820 [ 26.640475] ? _cond_resched+0x14/0x30 [ 26.644329] ? generic_pipe_buf_nosteal+0x10/0x10 [ 26.649142] ? do_splice_to+0x170/0x170 [ 26.653081] ? security_file_permission+0x89/0x1f0 [ 26.657982] ? rw_verify_area+0xe5/0x2b0 [ 26.662014] do_splice_direct+0x2a7/0x3d0 [ 26.666132] ? splice_direct_to_actor+0x820/0x820 [ 26.670958] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 26.675684] ? __sb_start_write+0x203/0x290 [ 26.679979] do_sendfile+0x5d5/0xe90 [ 26.683670] ? do_compat_pwritev64+0x100/0x100 [ 26.688225] ? kmem_cache_free+0x249/0x280 [ 26.692437] ? __might_sleep+0x95/0x190 [ 26.696386] compat_SyS_sendfile+0xea/0x1a0 [ 26.700674] ? SyS_sendfile64+0x160/0x160 [ 26.704794] ? do_fast_syscall_32+0x156/0xf9d [ 26.709259] ? SyS_sendfile64+0x160/0x160 [ 26.713463] do_fast_syscall_32+0x3ee/0xf9d [ 26.717845] ? do_int80_syscall_32+0x9d0/0x9d0 [ 26.722394] ? kasan_check_read+0x11/0x20 [ 26.726513] ? syscall_return_slowpath+0x550/0x550 [ 26.731415] ? SyS_rt_sigaction+0x94/0x1b0 [ 26.735628] ? sysret32_from_system_call+0x5/0x3b [ 26.740445] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.745265] entry_SYSENTER_compat+0x51/0x60 [ 26.749641] RIP: 0023:0xf7f2fc79 [ 26.752976] RSP: 002b:00000000ffd3be3c EFLAGS: 00000296 ORIG_RAX: 00000000000000bb [ 26.760653] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000003 [ 26.767894] RDX: 0000000020480ff8 RSI: 00000000000000ff RDI: 0000000000000002 [ 26.775134] RBP: 0000000020593000 R08: 0000000000000000 R09: 0000000000000000 [ 26.782373] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 26.789610] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 26.796871] [ 26.798465] The buggy address belongs to the variable: [ 26.803714] nstr.44443+0x18/0x40 [ 26.807129] [ 26.808721] Memory state around the buggy address: [ 26.813616] ffffffff85342900: fa fa fa fa 00 06 fa fa fa fa fa fa 07 fa fa fa [ 26.820946] ffffffff85342980: fa fa fa fa 05 fa fa fa fa fa fa fa 07 fa fa fa [ 26.828268] >ffffffff85342a00: fa fa fa fa 00 00 00 fa fa fa fa fa 00 fa fa fa [ 26.835593] ^ [ 26.840748] ffffffff85342a80: fa fa fa fa 07 fa fa fa fa fa fa fa 00 00 00 00 [ 26.848073] ffffffff85342b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 26.855395] ================================================================== [ 26.862715] Disabling lock debugging due to kernel taint [ 26.868130] Kernel panic - not syncing: panic_on_warn set ... [ 26.868130] [ 26.875456] CPU: 0 PID: 3079 Comm: syzkaller248656 Tainted: G B 4.15.0-rc1+ #115 [ 26.884164] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.893482] Call Trace: [ 26.896038] dump_stack+0x194/0x257 [ 26.899628] ? arch_local_irq_restore+0x53/0x53 [ 26.904265] ? vprintk_default+0x28/0x30 [ 26.908293] ? vsnprintf+0x1ed/0x1900 [ 26.912058] ? show_timer+0x1e0/0x2b0 [ 26.915824] panic+0x1e4/0x41c [ 26.918979] ? refcount_error_report+0x214/0x214 [ 26.923699] ? add_taint+0x40/0x50 [ 26.927202] ? add_taint+0x1c/0x50 [ 26.930707] ? show_timer+0x278/0x2b0 [ 26.934471] kasan_end_report+0x50/0x50 [ 26.938409] kasan_report+0x144/0x340 [ 26.942178] __asan_report_load8_noabort+0x14/0x20 [ 26.947070] show_timer+0x278/0x2b0 [ 26.950659] ? timers_start+0x14c/0x1c0 [ 26.954600] traverse+0x248/0xa00 [ 26.958020] ? seq_hlist_next+0xc0/0xc0 [ 26.961963] seq_read+0x96a/0x13d0 [ 26.965473] ? seq_lseek+0x3c0/0x3c0 [ 26.969150] ? selinux_file_permission+0x82/0x460 [ 26.973959] ? security_file_permission+0x89/0x1f0 [ 26.978852] ? rw_verify_area+0xe5/0x2b0 [ 26.982877] do_iter_read+0x3db/0x5b0 [ 26.986640] ? dup_iter+0x260/0x260 [ 26.990233] vfs_readv+0x121/0x1c0 [ 26.993738] ? compat_rw_copy_check_uvector+0x2e0/0x2e0 [ 26.999069] ? print_usage_bug+0x3f0/0x3f0 [ 27.003270] ? lock_downgrade+0x980/0x980 [ 27.007387] ? depot_save_stack+0x1c2/0x490 [ 27.011675] ? lock_release+0xda0/0xda0 [ 27.015615] ? mark_held_locks+0xb2/0x100 [ 27.019730] default_file_splice_read+0x508/0xae0 [ 27.024537] ? default_file_splice_read+0x508/0xae0 [ 27.029515] ? trace_hardirqs_on+0xd/0x10 [ 27.033629] ? do_splice_direct+0x3d0/0x3d0 [ 27.037916] ? print_usage_bug+0x3f0/0x3f0 [ 27.042118] ? save_stack+0xa3/0xd0 [ 27.045707] ? save_stack+0x43/0xd0 [ 27.049298] ? kasan_kmalloc+0xad/0xe0 [ 27.053151] ? __kmalloc+0x162/0x760 [ 27.056827] ? splice_direct_to_actor+0x650/0x820 [ 27.061634] ? do_splice_direct+0x2a7/0x3d0 [ 27.065921] ? do_sendfile+0x5d5/0xe90 [ 27.069771] ? compat_SyS_sendfile+0xea/0x1a0 [ 27.074231] ? do_fast_syscall_32+0x3ee/0xf9d [ 27.078690] ? print_usage_bug+0x3f0/0x3f0 [ 27.082891] ? __lock_is_held+0xbc/0x140 [ 27.086926] ? fsnotify+0x7b3/0x1140 [ 27.090609] ? fsnotify_first_mark+0x2b0/0x2b0 [ 27.095158] ? avc_policy_seqno+0x9/0x20 [ 27.099181] ? selinux_file_permission+0x82/0x460 [ 27.103989] ? security_file_permission+0x89/0x1f0 [ 27.108885] ? do_splice_direct+0x3d0/0x3d0 [ 27.113170] do_splice_to+0x110/0x170 [ 27.116936] ? do_splice_to+0x110/0x170 [ 27.120878] splice_direct_to_actor+0x242/0x820 [ 27.125510] ? _cond_resched+0x14/0x30 [ 27.129368] ? generic_pipe_buf_nosteal+0x10/0x10 [ 27.134189] ? do_splice_to+0x170/0x170 [ 27.138127] ? security_file_permission+0x89/0x1f0 [ 27.143022] ? rw_verify_area+0xe5/0x2b0 [ 27.147048] do_splice_direct+0x2a7/0x3d0 [ 27.151162] ? splice_direct_to_actor+0x820/0x820 [ 27.155972] ? rcu_sync_lockdep_assert+0x6d/0xb0 [ 27.160694] ? __sb_start_write+0x203/0x290 [ 27.164982] do_sendfile+0x5d5/0xe90 [ 27.168664] ? do_compat_pwritev64+0x100/0x100 [ 27.173217] ? kmem_cache_free+0x249/0x280 [ 27.177417] ? __might_sleep+0x95/0x190 [ 27.181359] compat_SyS_sendfile+0xea/0x1a0 [ 27.185644] ? SyS_sendfile64+0x160/0x160 [ 27.189757] ? do_fast_syscall_32+0x156/0xf9d [ 27.194215] ? SyS_sendfile64+0x160/0x160 [ 27.198327] do_fast_syscall_32+0x3ee/0xf9d [ 27.202618] ? do_int80_syscall_32+0x9d0/0x9d0 [ 27.207162] ? kasan_check_read+0x11/0x20 [ 27.211274] ? syscall_return_slowpath+0x550/0x550 [ 27.216169] ? SyS_rt_sigaction+0x94/0x1b0 [ 27.220370] ? sysret32_from_system_call+0x5/0x3b [ 27.225176] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.229985] entry_SYSENTER_compat+0x51/0x60 [ 27.234356] RIP: 0023:0xf7f2fc79 [ 27.237684] RSP: 002b:00000000ffd3be3c EFLAGS: 00000296 ORIG_RAX: 00000000000000bb [ 27.245355] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000003 [ 27.252588] RDX: 0000000020480ff8 RSI: 00000000000000ff RDI: 0000000000000002 [ 27.259822] RBP: 0000000020593000 R08: 0000000000000000 R09: 0000000000000000 [ 27.267060] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 27.274294] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 27.281579] Dumping ftrace buffer: [ 27.285085] (ftrace buffer empty) [ 27.288764] Kernel Offset: disabled [ 27.292359] Rebooting in 86400 seconds..