[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. syzkaller login: [ 42.895825][ T6825] IPVS: ftp: loaded support on port[0] = 21 [ 42.897335][ T6829] IPVS: ftp: loaded support on port[0] = 21 [ 42.915625][ T6832] IPVS: ftp: loaded support on port[0] = 21 [ 42.920677][ T6831] IPVS: ftp: loaded support on port[0] = 21 [ 42.925565][ T6830] IPVS: ftp: loaded support on port[0] = 21 [ 42.936004][ T6833] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 46.217152][ T23] Bluetooth: hci4: command 0x0409 tx timeout [ 46.223909][ T23] Bluetooth: hci3: command 0x0409 tx timeout [ 46.226483][ T46] Bluetooth: hci1: command 0x0409 tx timeout [ 46.236183][ T46] Bluetooth: hci5: command 0x0409 tx timeout [ 46.242899][ T46] Bluetooth: hci0: command 0x0409 tx timeout [ 46.249052][ T46] Bluetooth: hci2: command 0x0409 tx timeout [ 48.295511][ T23] Bluetooth: hci1: command 0x041b tx timeout [ 48.301830][ T23] Bluetooth: hci3: command 0x041b tx timeout [ 48.305479][ T46] Bluetooth: hci2: command 0x041b tx timeout [ 48.310245][ T23] Bluetooth: hci4: command 0x041b tx timeout [ 48.314179][ T46] Bluetooth: hci0: command 0x041b tx timeout [ 48.326465][ T46] Bluetooth: hci5: command 0x041b tx timeout executing program executing program executing program executing program executing program executing program executing program [ 49.193889][ T6988] ================================================================== [ 49.202118][ T6988] BUG: KASAN: use-after-free in __sco_sock_close+0x47c/0xed0 [ 49.209481][ T6988] Write of size 4 at addr ffff8880888ae010 by task syz-executor198/6988 [ 49.221101][ T6988] [ 49.223437][ T6988] CPU: 0 PID: 6988 Comm: syz-executor198 Not tainted 5.8.0-syzkaller #0 [ 49.231789][ T6988] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 executing program executing program executing program executing program executing program [ 49.242291][ T6988] Call Trace: [ 49.245589][ T6988] dump_stack+0x1f0/0x31e [ 49.250975][ T6988] print_address_description+0x66/0x5a0 [ 49.256673][ T6988] ? printk+0x62/0x83 [ 49.260661][ T6988] ? vprintk_emit+0x339/0x3c0 [ 49.265353][ T6988] kasan_report+0x132/0x1d0 [ 49.269898][ T6988] ? __sco_sock_close+0x47c/0xed0 [ 49.275066][ T6988] check_memory_region+0x2b5/0x2f0 [ 49.280175][ T6988] __sco_sock_close+0x47c/0xed0 [ 49.285017][ T6988] ? lockdep_hardirqs_on+0x49/0xf0 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.290225][ T6988] sco_sock_release+0x63/0x4f0 [ 49.294997][ T6988] ? down_write+0xcd/0x130 [ 49.299431][ T6988] sock_close+0xd8/0x260 [ 49.303697][ T6988] ? sock_mmap+0x90/0x90 [ 49.307954][ T6988] __fput+0x2f0/0x750 [ 49.311952][ T6988] task_work_run+0x137/0x1c0 [ 49.316555][ T6988] do_exit+0x5f3/0x1f20 [ 49.321335][ T6988] ? trace_lock_release+0x137/0x1a0 [ 49.326555][ T6988] do_group_exit+0x161/0x2d0 [ 49.331160][ T6988] get_signal+0x139b/0x1d30 [ 49.335698][ T6988] do_signal+0x33/0x610 executing program executing program executing program executing program executing program executing program [ 49.340229][ T6988] ? __prepare_exit_to_usermode+0x6d/0x1b0 [ 49.346065][ T6988] __prepare_exit_to_usermode+0xc3/0x1b0 [ 49.351712][ T6988] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.357885][ T6988] do_syscall_64+0x7f/0xe0 [ 49.362507][ T6988] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.368491][ T6988] RIP: 0033:0x446eb9 [ 49.372386][ T6988] Code: Bad RIP value. [ 49.376476][ T6988] RSP: 002b:00007fff1f571368 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 49.384893][ T6988] RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 0000000000446eb9 executing program executing program executing program executing program executing program executing program [ 49.392870][ T6988] RDX: 0000000000000008 RSI: 00000000200001c0 RDI: 0000000000000004 [ 49.400850][ T6988] RBP: 0000000000000004 R08: 0000000000000002 R09: 00000000000000ff [ 49.408829][ T6988] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 [ 49.416807][ T6988] R13: 0000000000407b10 R14: 0000000000000000 R15: 0000000000000000 [ 49.424922][ T6988] [ 49.427252][ T6988] Allocated by task 6988: [ 49.431585][ T6988] __kasan_kmalloc+0x103/0x140 [ 49.436356][ T6988] kmem_cache_alloc_trace+0x234/0x300 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.441737][ T6988] hci_conn_add+0x5d/0x1040 [ 49.446466][ T6988] hci_connect_sco+0x29a/0xa10 [ 49.451327][ T6988] sco_sock_connect+0x2de/0xaa0 [ 49.456280][ T6988] __sys_connect+0x2da/0x360 [ 49.460900][ T6988] __x64_sys_connect+0x76/0x80 [ 49.465667][ T6988] do_syscall_64+0x73/0xe0 [ 49.470088][ T6988] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.476068][ T6988] [ 49.478399][ T6988] Freed by task 6983: [ 49.482557][ T6988] __kasan_slab_free+0x114/0x170 [ 49.487497][ T6988] kfree+0x10a/0x220 executing program executing program executing program executing program executing program executing program executing program [ 49.491397][ T6988] device_release+0x70/0x1a0 [ 49.495988][ T6988] kobject_put+0x15b/0x220 [ 49.500413][ T6988] hci_conn_del+0x2c2/0x550 [ 49.504922][ T6988] hci_event_packet+0x8335/0x18260 [ 49.510049][ T6988] hci_rx_work+0x236/0x9c0 [ 49.515447][ T6988] process_one_work+0x789/0xfc0 [ 49.520331][ T6988] worker_thread+0xaa4/0x1460 [ 49.525109][ T6988] kthread+0x37e/0x3a0 [ 49.529800][ T6988] ret_from_fork+0x1f/0x30 [ 49.534244][ T6988] executing program executing program executing program executing program executing program [ 49.540663][ T6988] The buggy address belongs to the object at ffff8880888ae000 [ 49.540663][ T6988] which belongs to the cache kmalloc-4k of size 4096 [ 49.554807][ T6988] The buggy address is located 16 bytes inside of [ 49.554807][ T6988] 4096-byte region [ffff8880888ae000, ffff8880888af000) [ 49.569470][ T6988] The buggy address belongs to the page: [ 49.575898][ T6988] page:ffffea0002222b80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea0002222b80 order:1 compound_mapcount:0 [ 49.590132][ T6988] flags: 0xfffe0000010200(slab|head) executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.595685][ T6988] raw: 00fffe0000010200 ffffea0002a03f08 ffffea0002a1ca88 ffff8880aa402000 [ 49.605056][ T6988] raw: 0000000000000000 ffff8880888ae000 0000000100000001 0000000000000000 [ 49.613639][ T6988] page dumped because: kasan: bad access detected [ 49.620046][ T6988] [ 49.622375][ T6988] Memory state around the buggy address: [ 49.628109][ T6988] ffff8880888adf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.636173][ T6988] ffff8880888adf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 49.647539][ T6988] >ffff8880888ae000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 49.655864][ T6988] ^ [ 49.660452][ T6988] ffff8880888ae080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 49.669300][ T6988] ffff8880888ae100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 49.677880][ T6988] ================================================================== [ 49.685964][ T6988] Disabling lock debugging due to kernel taint executing program executing program [ 49.699496][ T6988] Kernel panic - not syncing: panic_on_warn set ... [ 49.706836][ T6988] CPU: 0 PID: 6988 Comm: syz-executor198 Tainted: G B 5.8.0-syzkaller #0 [ 49.716546][ T6988] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.727360][ T6988] Call Trace: [ 49.730724][ T6988] dump_stack+0x1f0/0x31e [ 49.735031][ T6988] panic+0x264/0x7a0 [ 49.739541][ T6988] ? trace_hardirqs_on+0x30/0x80 [ 49.745255][ T6988] kasan_report+0x1c9/0x1d0 [ 49.749920][ T6988] ? __sco_sock_close+0x47c/0xed0 [ 49.755819][ T6988] check_memory_region+0x2b5/0x2f0 [ 49.761023][ T6988] __sco_sock_close+0x47c/0xed0 [ 49.765862][ T6988] ? lockdep_hardirqs_on+0x49/0xf0 [ 49.770953][ T6988] sco_sock_release+0x63/0x4f0 [ 49.775926][ T6988] ? down_write+0xcd/0x130 [ 49.780408][ T6988] sock_close+0xd8/0x260 [ 49.784635][ T6988] ? sock_mmap+0x90/0x90 [ 49.788958][ T6988] __fput+0x2f0/0x750 [ 49.793714][ T6988] task_work_run+0x137/0x1c0 [ 49.798487][ T6988] do_exit+0x5f3/0x1f20 [ 49.802630][ T6988] ? trace_lock_release+0x137/0x1a0 [ 49.808709][ T6988] do_group_exit+0x161/0x2d0 [ 49.813276][ T6988] get_signal+0x139b/0x1d30 [ 49.817938][ T6988] do_signal+0x33/0x610 [ 49.822864][ T6988] ? __prepare_exit_to_usermode+0x6d/0x1b0 [ 49.828836][ T6988] __prepare_exit_to_usermode+0xc3/0x1b0 [ 49.834741][ T6988] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.840970][ T6988] do_syscall_64+0x7f/0xe0 [ 49.845385][ T6988] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 49.851277][ T6988] RIP: 0033:0x446eb9 [ 49.855578][ T6988] Code: Bad RIP value. [ 49.859631][ T6988] RSP: 002b:00007fff1f571368 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 49.868290][ T6988] RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 0000000000446eb9 [ 49.876511][ T6988] RDX: 0000000000000008 RSI: 00000000200001c0 RDI: 0000000000000004 [ 49.884482][ T6988] RBP: 0000000000000004 R08: 0000000000000002 R09: 00000000000000ff [ 49.892476][ T6988] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 [ 49.904776][ T6988] R13: 0000000000407b10 R14: 0000000000000000 R15: 0000000000000000 [ 49.914419][ T6988] Kernel Offset: disabled [ 49.918916][ T6988] Rebooting in 86400 seconds..