[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.130' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 61.499041][ T8021] ================================================================== [ 61.507405][ T8021] BUG: KASAN: use-after-free in fsnotify_detach_connector_from_object+0x25e/0x380 [ 61.516599][ T8021] Write of size 8 at addr ffff88809fd7e7c0 by task syz-executor972/8021 [ 61.524921][ T8021] [ 61.527257][ T8021] CPU: 1 PID: 8021 Comm: syz-executor972 Not tainted 5.7.0-syzkaller #0 [ 61.536106][ T8021] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 61.546153][ T8021] Call Trace: [ 61.549463][ T8021] dump_stack+0x188/0x20d [ 61.553808][ T8021] ? fsnotify_detach_connector_from_object+0x25e/0x380 [ 61.562073][ T8021] ? fsnotify_detach_connector_from_object+0x25e/0x380 [ 61.568932][ T8021] print_address_description.constprop.0.cold+0xd3/0x413 [ 61.575947][ T8021] ? kfree+0x285/0x2b0 [ 61.580072][ T8021] ? vprintk_func+0x97/0x1a6 [ 61.584730][ T8021] ? fsnotify_detach_connector_from_object+0x25e/0x380 [ 61.591721][ T8021] kasan_report.cold+0x1f/0x37 [ 61.596481][ T8021] ? fsnotify_detach_connector_from_object+0x25e/0x380 [ 61.603343][ T8021] check_memory_region+0x141/0x190 [ 61.608551][ T8021] fsnotify_detach_connector_from_object+0x25e/0x380 [ 61.615254][ T8021] fsnotify_put_mark+0x367/0x580 [ 61.620243][ T8021] ? __fsnotify_recalc_mask+0x290/0x290 [ 61.625793][ T8021] ? do_raw_spin_unlock+0x171/0x260 [ 61.630998][ T8021] ? inotify_free_event+0x20/0x20 [ 61.636022][ T8021] fsnotify_clear_marks_by_group+0x33f/0x490 [ 61.642100][ T8021] ? fsnotify_add_mark+0x90/0x90 [ 61.647026][ T8021] ? rwlock_bug.part.0+0x90/0x90 [ 61.652095][ T8021] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 61.658068][ T8021] ? idr_callback.cold+0x72/0x72 [ 61.662990][ T8021] fsnotify_destroy_group+0xc9/0x300 [ 61.668280][ T8021] ? fsnotify_group_stop_queueing+0x60/0x60 [ 61.674203][ T8021] ? locks_remove_file+0x329/0x590 [ 61.679317][ T8021] ? task_work_run+0xd3/0x1b0 [ 61.684010][ T8021] ? fcntl_setlk+0xcc0/0xcc0 [ 61.688625][ T8021] ? idr_callback.cold+0x72/0x72 [ 61.693567][ T8021] inotify_release+0x33/0x40 [ 61.698155][ T8021] __fput+0x33e/0x880 [ 61.702129][ T8021] task_work_run+0xf4/0x1b0 [ 61.706722][ T8021] do_exit+0xb3f/0x2de0 [ 61.710885][ T8021] ? find_held_lock+0x2d/0x110 [ 61.715654][ T8021] ? do_group_exit+0x2c7/0x340 [ 61.720423][ T8021] ? mm_update_next_owner+0x7a0/0x7a0 [ 61.725778][ T8021] ? lock_downgrade+0x840/0x840 [ 61.730714][ T8021] ? do_raw_spin_lock+0x129/0x2e0 [ 61.735752][ T8021] ? _raw_spin_unlock_irq+0x1f/0x80 [ 61.740938][ T8021] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 61.747090][ T8021] do_group_exit+0x125/0x340 [ 61.751685][ T8021] __x64_sys_exit_group+0x3a/0x50 [ 61.756707][ T8021] do_syscall_64+0xf6/0x7d0 [ 61.761196][ T8021] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 61.767073][ T8021] RIP: 0033:0x445448 [ 61.770967][ T8021] Code: Bad RIP value. [ 61.775026][ T8021] RSP: 002b:00007ffe48521018 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 61.783416][ T8021] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445448 [ 61.792252][ T8021] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 61.800254][ T8021] RBP: 00000000004cca90 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 61.808223][ T8021] R10: 00007ffe48521060 R11: 0000000000000246 R12: 0000000000000001 [ 61.816191][ T8021] R13: 00000000006e0340 R14: 0000000000000007 R15: 000000000000002d [ 61.824170][ T8021] [ 61.826481][ T8021] Allocated by task 8026: [ 61.830818][ T8021] save_stack+0x1b/0x40 [ 61.834968][ T8021] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 61.840598][ T8021] kmem_cache_alloc_trace+0x153/0x7d0 [ 61.845960][ T8021] alloc_super+0x52/0x9d0 [ 61.850283][ T8021] sget_fc+0x13f/0x790 [ 61.854372][ T8021] vfs_get_super+0x6d/0x2d0 [ 61.858868][ T8021] vfs_get_tree+0x89/0x2f0 [ 61.863266][ T8021] do_mount+0x1306/0x1b40 [ 61.867577][ T8021] __x64_sys_mount+0x18f/0x230 [ 61.872328][ T8021] do_syscall_64+0xf6/0x7d0 [ 61.876830][ T8021] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 61.882709][ T8021] [ 61.885049][ T8021] Freed by task 23: [ 61.888940][ T8021] save_stack+0x1b/0x40 [ 61.893091][ T8021] __kasan_slab_free+0xf7/0x140 [ 61.898007][ T8021] kfree+0x109/0x2b0 [ 61.902060][ T8021] process_one_work+0x965/0x16a0 [ 61.906989][ T8021] worker_thread+0x96/0xe20 [ 61.911695][ T8021] kthread+0x388/0x470 [ 61.916363][ T8021] ret_from_fork+0x24/0x30 [ 61.920762][ T8021] [ 61.923120][ T8021] The buggy address belongs to the object at ffff88809fd7e000 [ 61.923120][ T8021] which belongs to the cache kmalloc-4k of size 4096 [ 61.937808][ T8021] The buggy address is located 1984 bytes inside of [ 61.937808][ T8021] 4096-byte region [ffff88809fd7e000, ffff88809fd7f000) [ 61.951602][ T8021] The buggy address belongs to the page: [ 61.957241][ T8021] page:ffffea00027f5f80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea00027f5f80 order:1 compound_mapcount:0 [ 61.970677][ T8021] flags: 0xfffe0000010200(slab|head) [ 61.975965][ T8021] raw: 00fffe0000010200 ffffea000247aa88 ffffea000242ef08 ffff8880aa002000 [ 61.984560][ T8021] raw: 0000000000000000 ffff88809fd7e000 0000000100000001 0000000000000000 [ 61.993135][ T8021] page dumped because: kasan: bad access detected [ 61.999541][ T8021] [ 62.001849][ T8021] Memory state around the buggy address: [ 62.007460][ T8021] ffff88809fd7e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.015506][ T8021] ffff88809fd7e700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.023548][ T8021] >ffff88809fd7e780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.031594][ T8021] ^ [ 62.037750][ T8021] ffff88809fd7e800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.045800][ T8021] ffff88809fd7e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 62.053862][ T8021] ================================================================== [ 62.061925][ T8021] Disabling lock debugging due to kernel taint [ 62.068274][ T8021] Kernel panic - not syncing: panic_on_warn set ... [ 62.074863][ T8021] CPU: 1 PID: 8021 Comm: syz-executor972 Tainted: G B 5.7.0-syzkaller #0 [ 62.084651][ T8021] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 62.094708][ T8021] Call Trace: [ 62.098002][ T8021] dump_stack+0x188/0x20d [ 62.102331][ T8021] ? fsnotify_detach_connector_from_object+0x230/0x380 [ 62.109295][ T8021] panic+0x2e3/0x75c [ 62.113702][ T8021] ? add_taint.cold+0x16/0x16 [ 62.118451][ T8021] ? fsnotify_detach_connector_from_object+0x25e/0x380 [ 62.126863][ T8021] ? trace_hardirqs_on+0x55/0x230 [ 62.131877][ T8021] ? fsnotify_detach_connector_from_object+0x25e/0x380 [ 62.138710][ T8021] ? fsnotify_detach_connector_from_object+0x25e/0x380 [ 62.145643][ T8021] end_report+0x4d/0x53 [ 62.149781][ T8021] kasan_report.cold+0xd/0x37 [ 62.154704][ T8021] ? fsnotify_detach_connector_from_object+0x25e/0x380 [ 62.161549][ T8021] check_memory_region+0x141/0x190 [ 62.166665][ T8021] fsnotify_detach_connector_from_object+0x25e/0x380 [ 62.173317][ T8021] fsnotify_put_mark+0x367/0x580 [ 62.178664][ T8021] ? __fsnotify_recalc_mask+0x290/0x290 [ 62.184212][ T8021] ? do_raw_spin_unlock+0x171/0x260 [ 62.189404][ T8021] ? inotify_free_event+0x20/0x20 [ 62.194407][ T8021] fsnotify_clear_marks_by_group+0x33f/0x490 [ 62.200476][ T8021] ? fsnotify_add_mark+0x90/0x90 [ 62.205389][ T8021] ? rwlock_bug.part.0+0x90/0x90 [ 62.210305][ T8021] ? lockdep_hardirqs_on_prepare+0x590/0x590 [ 62.216266][ T8021] ? idr_callback.cold+0x72/0x72 [ 62.221185][ T8021] fsnotify_destroy_group+0xc9/0x300 [ 62.226466][ T8021] ? fsnotify_group_stop_queueing+0x60/0x60 [ 62.232335][ T8021] ? locks_remove_file+0x329/0x590 [ 62.237422][ T8021] ? task_work_run+0xd3/0x1b0 [ 62.242119][ T8021] ? fcntl_setlk+0xcc0/0xcc0 [ 62.246713][ T8021] ? idr_callback.cold+0x72/0x72 [ 62.251623][ T8021] inotify_release+0x33/0x40 [ 62.256208][ T8021] __fput+0x33e/0x880 [ 62.260184][ T8021] task_work_run+0xf4/0x1b0 [ 62.264664][ T8021] do_exit+0xb3f/0x2de0 [ 62.268814][ T8021] ? find_held_lock+0x2d/0x110 [ 62.273553][ T8021] ? do_group_exit+0x2c7/0x340 [ 62.278310][ T8021] ? mm_update_next_owner+0x7a0/0x7a0 [ 62.283663][ T8021] ? lock_downgrade+0x840/0x840 [ 62.288512][ T8021] ? do_raw_spin_lock+0x129/0x2e0 [ 62.293871][ T8021] ? _raw_spin_unlock_irq+0x1f/0x80 [ 62.299047][ T8021] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 62.305034][ T8021] do_group_exit+0x125/0x340 [ 62.309687][ T8021] __x64_sys_exit_group+0x3a/0x50 [ 62.314696][ T8021] do_syscall_64+0xf6/0x7d0 [ 62.319184][ T8021] entry_SYSCALL_64_after_hwframe+0x49/0xb3 [ 62.325397][ T8021] RIP: 0033:0x445448 [ 62.329274][ T8021] Code: Bad RIP value. [ 62.333321][ T8021] RSP: 002b:00007ffe48521018 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 62.341730][ T8021] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445448 [ 62.349676][ T8021] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 62.358855][ T8021] RBP: 00000000004cca90 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 62.366804][ T8021] R10: 00007ffe48521060 R11: 0000000000000246 R12: 0000000000000001 [ 62.374766][ T8021] R13: 00000000006e0340 R14: 0000000000000007 R15: 000000000000002d [ 62.384147][ T8021] Kernel Offset: disabled [ 62.388461][ T8021] Rebooting in 86400 seconds..