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 '10.128.10.40' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 30.541772] VFS: Busy inodes after unmount of fuse. Self-destruct in 5 seconds. Have a nice day... [ 30.566260] ================================================================== [ 30.573833] BUG: KASAN: use-after-free in iput+0xa05/0xa80 [ 30.579447] Read of size 8 at addr ffff8801d9752770 by task syzkaller802106/4482 [ 30.586965] [ 30.588580] CPU: 1 PID: 4482 Comm: syzkaller802106 Not tainted 4.17.0-rc1+ #6 [ 30.595831] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.605173] Call Trace: [ 30.607759] dump_stack+0x1b9/0x294 [ 30.611383] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.616557] ? printk+0x9e/0xba [ 30.619817] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 30.624553] ? kasan_check_write+0x14/0x20 [ 30.628774] print_address_description+0x6c/0x20b [ 30.633596] ? iput+0xa05/0xa80 [ 30.636853] kasan_report.cold.7+0x242/0x2fe [ 30.641244] __asan_report_load8_noabort+0x14/0x20 [ 30.646166] iput+0xa05/0xa80 [ 30.649254] ? inode_add_lru+0x290/0x290 [ 30.653301] ? wait_for_completion+0x870/0x870 [ 30.657873] ? trace_hardirqs_off+0xd/0x10 [ 30.662188] ? quarantine_put+0xeb/0x190 [ 30.666241] ? kfree+0x111/0x260 [ 30.669590] ? destroy_local_trace_uprobe+0x3c/0x7e [ 30.674587] free_trace_uprobe+0xe2/0x1f0 [ 30.678715] destroy_local_trace_uprobe+0x63/0x7e [ 30.683550] perf_uprobe_destroy+0xf2/0x130 [ 30.687859] ? perf_uprobe_init+0x280/0x280 [ 30.692167] _free_event+0x3ff/0x1430 [ 30.695950] ? __mutex_unlock_slowpath+0x110/0x8a0 [ 30.700860] ? ring_buffer_attach+0x830/0x830 [ 30.705341] ? lock_downgrade+0x8e0/0x8e0 [ 30.709476] ? mark_held_locks+0xc9/0x160 [ 30.713618] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 30.718190] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.722670] put_event+0x48/0x60 [ 30.726020] perf_event_release_kernel+0x8bd/0xf90 [ 30.730930] ? put_event+0x60/0x60 [ 30.734453] ? debug_check_no_locks_freed+0x310/0x310 [ 30.739640] ? kasan_check_read+0x11/0x20 [ 30.743774] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.748178] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 30.752743] ? kasan_check_write+0x14/0x20 [ 30.756958] ? do_raw_spin_lock+0xc1/0x200 [ 30.761173] ? trace_hardirqs_off+0xd/0x10 [ 30.765409] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 30.770492] ? depot_save_stack+0x26b/0x450 [ 30.774790] ? graph_lock+0x170/0x170 [ 30.778582] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.784119] ? locks_remove_file+0x3f7/0x5a0 [ 30.788510] ? fcntl_setlk+0x1020/0x1020 [ 30.792550] ? fsnotify+0x415/0x1100 [ 30.796252] ? perf_event_release_kernel+0xf90/0xf90 [ 30.801334] perf_release+0x37/0x50 [ 30.804941] __fput+0x34d/0x890 [ 30.808200] ? fput+0x1a0/0x1a0 [ 30.811469] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.815945] ____fput+0x15/0x20 [ 30.819215] task_work_run+0x1e4/0x290 [ 30.823082] ? task_work_cancel+0x240/0x240 [ 30.827389] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.832905] ? switch_task_namespaces+0xa2/0xd0 [ 30.837556] do_exit+0x1aee/0x2730 [ 30.841076] ? plist_add+0x770/0x770 [ 30.844783] ? mm_update_next_owner+0x980/0x980 [ 30.849443] ? print_usage_bug+0xc0/0xc0 [ 30.853483] ? graph_lock+0x170/0x170 [ 30.857272] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.861670] ? rcu_note_context_switch+0x710/0x710 [ 30.866586] ? lock_acquire+0x1dc/0x520 [ 30.870556] ? __might_sleep+0x95/0x190 [ 30.874515] ? __lock_acquire+0x7f5/0x5140 [ 30.878747] ? debug_check_no_locks_freed+0x310/0x310 [ 30.883917] ? do_raw_spin_unlock+0x9e/0x2e0 [ 30.888306] ? kasan_check_write+0x14/0x20 [ 30.892522] ? native_queued_spin_lock_slowpath+0x1a0/0xde0 [ 30.898211] ? kasan_check_write+0x14/0x20 [ 30.902425] ? .slowpath+0x15/0x15 [ 30.905952] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.911476] ? drop_futex_key_refs.isra.13+0x6d/0xe0 [ 30.916567] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.922085] ? futex_wait+0x5c1/0x9f0 [ 30.925869] ? futex_wait_setup+0x400/0x400 [ 30.930180] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 30.935351] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.940866] ? drop_futex_key_refs.isra.13+0x6d/0xe0 [ 30.945947] ? futex_wake+0x2f6/0x750 [ 30.949728] ? graph_lock+0x170/0x170 [ 30.953516] ? memset+0x31/0x40 [ 30.956777] ? find_held_lock+0x36/0x1c0 [ 30.960822] ? lock_downgrade+0x8e0/0x8e0 [ 30.964966] do_group_exit+0x16f/0x430 [ 30.968847] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 30.973422] ? __ia32_sys_exit+0x50/0x50 [ 30.977468] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.981947] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.986945] get_signal+0x886/0x1960 [ 30.990644] ? ptrace_notify+0x130/0x130 [ 30.994683] ? graph_lock+0x170/0x170 [ 30.998465] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.003469] ? trace_hardirqs_on+0xd/0x10 [ 31.007598] ? find_held_lock+0x36/0x1c0 [ 31.011643] ? find_held_lock+0x36/0x1c0 [ 31.015685] do_signal+0x98/0x2040 [ 31.019206] ? lock_downgrade+0x8e0/0x8e0 [ 31.023334] ? setup_sigcontext+0x7d0/0x7d0 [ 31.027636] ? kasan_check_read+0x11/0x20 [ 31.031775] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.036163] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.040728] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.045213] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.050214] ? exit_to_usermode_loop+0x87/0x310 [ 31.054865] exit_to_usermode_loop+0x28a/0x310 [ 31.059429] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.064252] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.068728] ? do_syscall_64+0x92/0x800 [ 31.072691] do_syscall_64+0x6ac/0x800 [ 31.076561] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.081480] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.086397] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.091749] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.096575] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.101745] RIP: 0033:0x4457b9 [ 31.104913] RSP: 002b:00007f98cec58da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 31.112607] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00000000004457b9 [ 31.119854] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dac3c [ 31.127189] RBP: 00000000006dac3c R08: 0000000000000000 R09: 0000000000000000 [ 31.134437] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac38 [ 31.141686] R13: 0030656c69662f2e R14: 00007f98cec599c0 R15: 0000000000000001 [ 31.148940] [ 31.150544] Allocated by task 4481: [ 31.154154] save_stack+0x43/0xd0 [ 31.157608] kasan_kmalloc+0xc4/0xe0 [ 31.161300] kmem_cache_alloc_trace+0x152/0x780 [ 31.165948] sget_userns+0x1c7/0xf20 [ 31.169638] sget+0x10b/0x150 [ 31.172721] mount_nodev+0x33/0x110 [ 31.176329] fuse_mount+0x2c/0x40 [ 31.179762] mount_fs+0xae/0x328 [ 31.183106] vfs_kern_mount.part.34+0xd4/0x4d0 [ 31.187678] do_mount+0x564/0x3070 [ 31.191195] ksys_mount+0x12d/0x140 [ 31.194800] __x64_sys_mount+0xbe/0x150 [ 31.198757] do_syscall_64+0x1b1/0x800 [ 31.202633] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.207804] [ 31.209409] Freed by task 25: [ 31.212501] save_stack+0x43/0xd0 [ 31.215934] __kasan_slab_free+0x11a/0x170 [ 31.220147] kasan_slab_free+0xe/0x10 [ 31.223923] kfree+0xd9/0x260 [ 31.227007] destroy_super_work+0x40/0x50 [ 31.231133] process_one_work+0xc1e/0x1b50 [ 31.235345] worker_thread+0x1cc/0x1440 [ 31.239298] kthread+0x345/0x410 [ 31.242644] ret_from_fork+0x3a/0x50 [ 31.246338] [ 31.247946] The buggy address belongs to the object at ffff8801d9752740 [ 31.247946] which belongs to the cache kmalloc-4096 of size 4096 [ 31.260771] The buggy address is located 48 bytes inside of [ 31.260771] 4096-byte region [ffff8801d9752740, ffff8801d9753740) [ 31.272624] The buggy address belongs to the page: [ 31.277533] page:ffffea000765d480 count:1 mapcount:0 mapping:ffff8801d9752740 index:0x0 compound_mapcount: 0 [ 31.287492] flags: 0x2fffc0000008100(slab|head) [ 31.292151] raw: 02fffc0000008100 ffff8801d9752740 0000000000000000 0000000100000001 [ 31.300011] raw: ffffea000765a1a0 ffffea00076665a0 ffff8801dac00dc0 0000000000000000 [ 31.307864] page dumped because: kasan: bad access detected [ 31.313549] [ 31.315152] Memory state around the buggy address: [ 31.320073] ffff8801d9752600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.327409] ffff8801d9752680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.334763] >ffff8801d9752700: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 31.342103] ^ [ 31.349092] ffff8801d9752780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.356432] ffff8801d9752800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.363763] ================================================================== [ 31.371096] Disabling lock debugging due to kernel taint [ 31.376628] Kernel panic - not syncing: panic_on_warn set ... [ 31.376628] [ 31.384003] CPU: 1 PID: 4482 Comm: syzkaller802106 Tainted: G B 4.17.0-rc1+ #6 [ 31.392666] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.401996] Call Trace: [ 31.404575] dump_stack+0x1b9/0x294 [ 31.408180] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.413349] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 31.418101] ? iput+0x950/0xa80 [ 31.421361] panic+0x22f/0x4de [ 31.424540] ? add_taint.cold.5+0x16/0x16 [ 31.428668] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.433067] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.437454] ? iput+0xa05/0xa80 [ 31.440722] kasan_end_report+0x47/0x4f [ 31.444676] kasan_report.cold.7+0x76/0x2fe [ 31.448977] __asan_report_load8_noabort+0x14/0x20 [ 31.453887] iput+0xa05/0xa80 [ 31.456972] ? inode_add_lru+0x290/0x290 [ 31.461016] ? wait_for_completion+0x870/0x870 [ 31.465585] ? trace_hardirqs_off+0xd/0x10 [ 31.469799] ? quarantine_put+0xeb/0x190 [ 31.473838] ? kfree+0x111/0x260 [ 31.477187] ? destroy_local_trace_uprobe+0x3c/0x7e [ 31.482183] free_trace_uprobe+0xe2/0x1f0 [ 31.486310] destroy_local_trace_uprobe+0x63/0x7e [ 31.491133] perf_uprobe_destroy+0xf2/0x130 [ 31.495435] ? perf_uprobe_init+0x280/0x280 [ 31.499743] _free_event+0x3ff/0x1430 [ 31.503522] ? __mutex_unlock_slowpath+0x110/0x8a0 [ 31.508429] ? ring_buffer_attach+0x830/0x830 [ 31.512902] ? lock_downgrade+0x8e0/0x8e0 [ 31.517033] ? mark_held_locks+0xc9/0x160 [ 31.521160] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.525721] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.530195] put_event+0x48/0x60 [ 31.533546] perf_event_release_kernel+0x8bd/0xf90 [ 31.538456] ? put_event+0x60/0x60 [ 31.541976] ? debug_check_no_locks_freed+0x310/0x310 [ 31.547146] ? kasan_check_read+0x11/0x20 [ 31.551271] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.555658] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.560217] ? kasan_check_write+0x14/0x20 [ 31.564430] ? do_raw_spin_lock+0xc1/0x200 [ 31.568644] ? trace_hardirqs_off+0xd/0x10 [ 31.572857] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 31.577948] ? depot_save_stack+0x26b/0x450 [ 31.582248] ? graph_lock+0x170/0x170 [ 31.586034] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.591548] ? locks_remove_file+0x3f7/0x5a0 [ 31.595935] ? fcntl_setlk+0x1020/0x1020 [ 31.599972] ? fsnotify+0x415/0x1100 [ 31.603670] ? perf_event_release_kernel+0xf90/0xf90 [ 31.608753] perf_release+0x37/0x50 [ 31.612359] __fput+0x34d/0x890 [ 31.615618] ? fput+0x1a0/0x1a0 [ 31.618878] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.623352] ____fput+0x15/0x20 [ 31.626609] task_work_run+0x1e4/0x290 [ 31.630474] ? task_work_cancel+0x240/0x240 [ 31.634775] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.640288] ? switch_task_namespaces+0xa2/0xd0 [ 31.644935] do_exit+0x1aee/0x2730 [ 31.648450] ? plist_add+0x770/0x770 [ 31.652142] ? mm_update_next_owner+0x980/0x980 [ 31.656787] ? print_usage_bug+0xc0/0xc0 [ 31.660826] ? graph_lock+0x170/0x170 [ 31.664602] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.668990] ? rcu_note_context_switch+0x710/0x710 [ 31.673899] ? lock_acquire+0x1dc/0x520 [ 31.677852] ? __might_sleep+0x95/0x190 [ 31.681806] ? __lock_acquire+0x7f5/0x5140 [ 31.686031] ? debug_check_no_locks_freed+0x310/0x310 [ 31.691200] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.695590] ? kasan_check_write+0x14/0x20 [ 31.699802] ? native_queued_spin_lock_slowpath+0x1a0/0xde0 [ 31.705490] ? kasan_check_write+0x14/0x20 [ 31.709704] ? .slowpath+0x15/0x15 [ 31.713222] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.718738] ? drop_futex_key_refs.isra.13+0x6d/0xe0 [ 31.723821] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.729353] ? futex_wait+0x5c1/0x9f0 [ 31.733133] ? futex_wait_setup+0x400/0x400 [ 31.737435] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.742601] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.748126] ? drop_futex_key_refs.isra.13+0x6d/0xe0 [ 31.753215] ? futex_wake+0x2f6/0x750 [ 31.756992] ? graph_lock+0x170/0x170 [ 31.760776] ? memset+0x31/0x40 [ 31.764039] ? find_held_lock+0x36/0x1c0 [ 31.768082] ? lock_downgrade+0x8e0/0x8e0 [ 31.772211] do_group_exit+0x16f/0x430 [ 31.776079] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.780640] ? __ia32_sys_exit+0x50/0x50 [ 31.784682] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.789160] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.794159] get_signal+0x886/0x1960 [ 31.797854] ? ptrace_notify+0x130/0x130 [ 31.801892] ? graph_lock+0x170/0x170 [ 31.805676] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.810670] ? trace_hardirqs_on+0xd/0x10 [ 31.814796] ? find_held_lock+0x36/0x1c0 [ 31.818838] ? find_held_lock+0x36/0x1c0 [ 31.822879] do_signal+0x98/0x2040 [ 31.826399] ? lock_downgrade+0x8e0/0x8e0 [ 31.830533] ? setup_sigcontext+0x7d0/0x7d0 [ 31.834841] ? kasan_check_read+0x11/0x20 [ 31.838982] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.843370] ? do_raw_spin_trylock+0x1b0/0x1b0 [ 31.847932] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.852414] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.857421] ? exit_to_usermode_loop+0x87/0x310 [ 31.862068] exit_to_usermode_loop+0x28a/0x310 [ 31.866638] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 31.871459] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.875932] ? do_syscall_64+0x92/0x800 [ 31.879883] do_syscall_64+0x6ac/0x800 [ 31.883751] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.888659] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.893568] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.898921] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.903831] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.908996] RIP: 0033:0x4457b9 [ 31.912179] RSP: 002b:00007f98cec58da8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 31.919866] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00000000004457b9 [ 31.927851] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000006dac3c [ 31.935100] RBP: 00000000006dac3c R08: 0000000000000000 R09: 0000000000000000 [ 31.942347] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac38 [ 31.949596] R13: 0030656c69662f2e R14: 00007f98cec599c0 R15: 0000000000000001 [ 31.957409] Dumping ftrace buffer: [ 31.960925] (ftrace buffer empty) [ 31.964610] Kernel Offset: disabled [ 31.968222] Rebooting in 86400 seconds..