[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.249' (ECDSA) to the list of known hosts. syzkaller login: [ 57.598454] IPVS: ftp: loaded support on port[0] = 21 executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 57.686979] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 57.696407] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 57.706817] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 57.716373] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 57.772794] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 57.782582] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 57.791708] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 57.802057] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 57.860519] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 57.870414] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 59.632758] Bluetooth: hci0 command 0x0409 tx timeout write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 61.721722] Bluetooth: hci0 command 0x041b tx timeout write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 62.695240] nla_parse: 382 callbacks suppressed [ 62.695246] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 62.709578] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 62.718720] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 62.727689] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 62.783359] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 62.795030] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 62.804751] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 62.814364] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 62.873831] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 62.883193] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 63.791300] Bluetooth: hci0 command 0x040f tx timeout write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 65.871320] Bluetooth: hci0 command 0x0419 tx timeout write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 67.712865] nla_parse: 366 callbacks suppressed [ 67.712871] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 67.726717] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 67.737275] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 67.747276] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 67.814271] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 67.826823] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 67.837940] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 67.847243] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 67.902501] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. [ 67.912701] netlink: 4 bytes leftover after parsing attributes in process `syz-executor623'. write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory executing program [ 68.072231] ================================================================== [ 68.082047] BUG: KASAN: use-after-free in refcount_dec_not_one+0x9a/0xc0 [ 68.089530] Read of size 4 at addr ffff888099ec53d8 by task syz-executor623/9578 [ 68.098217] [ 68.100014] CPU: 0 PID: 9578 Comm: syz-executor623 Not tainted 4.14.232-syzkaller #0 [ 68.108322] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.118002] Call Trace: [ 68.120588] dump_stack+0x1b2/0x281 [ 68.124609] print_address_description.cold+0x54/0x1d3 [ 68.130421] kasan_report_error.cold+0x8a/0x191 [ 68.135264] ? refcount_dec_not_one+0x9a/0xc0 [ 68.140017] __asan_report_load4_noabort+0x68/0x70 [ 68.145034] ? refcount_dec_not_one+0x9a/0xc0 [ 68.149540] refcount_dec_not_one+0x9a/0xc0 [ 68.156613] refcount_dec_and_mutex_lock+0x1a/0x60 [ 68.162057] nbd_genl_connect+0xf94/0x1400 [ 68.166606] ? nbd_xmit_timeout+0x500/0x500 [ 68.171004] ? validate_nla+0x192/0x5e0 [ 68.175334] genl_family_rcv_msg+0x572/0xb20 [ 68.179867] ? genl_rcv+0x40/0x40 [ 68.183905] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 68.189975] ? trace_hardirqs_on+0x10/0x10 [ 68.194480] ? sock_sendmsg+0xb5/0x100 [ 68.198834] genl_rcv_msg+0xaf/0x140 [ 68.202794] netlink_rcv_skb+0x125/0x390 [ 68.207205] ? genl_family_rcv_msg+0xb20/0xb20 [ 68.211955] ? netlink_ack+0x9a0/0x9a0 [ 68.216181] ? lock_acquire+0x170/0x3f0 [ 68.220700] genl_rcv+0x24/0x40 [ 68.224197] netlink_unicast+0x437/0x610 [ 68.228546] ? netlink_sendskb+0xd0/0xd0 [ 68.232675] ? __check_object_size+0x179/0x230 [ 68.237542] netlink_sendmsg+0x62e/0xb80 [ 68.241688] ? nlmsg_notify+0x170/0x170 [ 68.248332] ? kernel_recvmsg+0x210/0x210 [ 68.253165] ? security_socket_sendmsg+0x83/0xb0 [ 68.259363] ? nlmsg_notify+0x170/0x170 [ 68.264402] sock_sendmsg+0xb5/0x100 [ 68.269843] ___sys_sendmsg+0x6c8/0x800 [ 68.274306] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 68.279267] ? netlink_dump+0xad0/0xad0 [ 68.283578] ? nlmsg_notify+0x170/0x170 [ 68.288073] ? security_socket_recvmsg+0x8b/0xc0 [ 68.293287] ? SyS_recvfrom+0x27f/0x340 [ 68.298592] ? SyS_send+0x40/0x40 [ 68.302852] ? vm_insert_page+0x7c0/0x7c0 [ 68.308488] ? __fdget+0x167/0x1f0 [ 68.312866] ? sockfd_lookup_light+0xb2/0x160 [ 68.317796] __sys_sendmsg+0xa3/0x120 [ 68.321960] ? SyS_shutdown+0x160/0x160 [ 68.326166] ? up_read+0x17/0x30 [ 68.329700] ? __do_page_fault+0x159/0xad0 [ 68.334422] SyS_sendmsg+0x27/0x40 [ 68.337978] ? __sys_sendmsg+0x120/0x120 [ 68.342120] do_syscall_64+0x1d5/0x640 [ 68.346205] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 68.351586] RIP: 0033:0x450a19 [ 68.354781] RSP: 002b:00007ffd257c4128 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 68.363206] RAX: ffffffffffffffda RBX: 0000000000db73bc RCX: 0000000000450a19 [ 68.371178] RDX: 0000000000040800 RSI: 0000000020000380 RDI: 0000000000000004 [ 68.379427] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 [ 68.387927] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 68.396142] R13: 000000000000000b R14: 00007ffd257c41e0 R15: 00000000000000c5 [ 68.404270] [ 68.406186] Allocated by task 9573: [ 68.410270] kasan_kmalloc+0xeb/0x160 [ 68.414155] kmem_cache_alloc_trace+0x131/0x3d0 [ 68.418976] nbd_dev_add+0x7c/0x800 [ 68.422755] nbd_genl_connect+0x3a4/0x1400 [ 68.427344] genl_family_rcv_msg+0x572/0xb20 [ 68.431880] genl_rcv_msg+0xaf/0x140 [ 68.435606] netlink_rcv_skb+0x125/0x390 [ 68.440216] genl_rcv+0x24/0x40 [ 68.443483] netlink_unicast+0x437/0x610 [ 68.447696] netlink_sendmsg+0x62e/0xb80 [ 68.452061] sock_sendmsg+0xb5/0x100 [ 68.455905] ___sys_sendmsg+0x6c8/0x800 [ 68.460216] __sys_sendmsg+0xa3/0x120 [ 68.464298] SyS_sendmsg+0x27/0x40 [ 68.467831] do_syscall_64+0x1d5/0x640 [ 68.471989] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 68.477404] [ 68.479043] Freed by task 9578: [ 68.482798] kasan_slab_free+0xc3/0x1a0 [ 68.486788] kfree+0xc9/0x250 [ 68.490005] nbd_put.part.0+0x100/0x140 [ 68.494452] nbd_config_put+0x62a/0x810 [ 68.499191] nbd_genl_connect+0xf6c/0x1400 [ 68.504209] genl_family_rcv_msg+0x572/0xb20 [ 68.509336] genl_rcv_msg+0xaf/0x140 [ 68.513047] netlink_rcv_skb+0x125/0x390 [ 68.517091] genl_rcv+0x24/0x40 [ 68.520637] netlink_unicast+0x437/0x610 [ 68.525409] netlink_sendmsg+0x62e/0xb80 [ 68.529803] sock_sendmsg+0xb5/0x100 [ 68.533864] ___sys_sendmsg+0x6c8/0x800 [ 68.539145] __sys_sendmsg+0xa3/0x120 [ 68.543046] SyS_sendmsg+0x27/0x40 [ 68.547268] do_syscall_64+0x1d5/0x640 [ 68.551303] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 68.556668] [ 68.558925] The buggy address belongs to the object at ffff888099ec5300 [ 68.558925] which belongs to the cache kmalloc-512 of size 512 [ 68.573127] The buggy address is located 216 bytes inside of [ 68.573127] 512-byte region [ffff888099ec5300, ffff888099ec5500) [ 68.585787] The buggy address belongs to the page: [ 68.591088] page:ffffea000267b140 count:1 mapcount:0 mapping:ffff888099ec5080 index:0x0 [ 68.599476] flags: 0xfff00000000100(slab) [ 68.604277] raw: 00fff00000000100 ffff888099ec5080 0000000000000000 0000000100000006 [ 68.612722] raw: ffffea0002d1ece0 ffffea0002d2ac60 ffff88813fe80940 0000000000000000 [ 68.621797] page dumped because: kasan: bad access detected [ 68.627502] [ 68.629547] Memory state around the buggy address: [ 68.634733] ffff888099ec5280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 68.642168] ffff888099ec5300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.649744] >ffff888099ec5380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.657396] ^ [ 68.663707] ffff888099ec5400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.671388] ffff888099ec5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 68.678869] ================================================================== [ 68.686382] Disabling lock debugging due to kernel taint [ 68.692826] Kernel panic - not syncing: panic_on_warn set ... [ 68.692826] [ 68.700364] CPU: 0 PID: 9578 Comm: syz-executor623 Tainted: G B 4.14.232-syzkaller #0 [ 68.709945] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.719654] Call Trace: [ 68.722247] dump_stack+0x1b2/0x281 [ 68.725968] panic+0x1f9/0x42d [ 68.729399] ? add_taint.cold+0x16/0x16 [ 68.733808] ? ___preempt_schedule+0x16/0x18 [ 68.738200] kasan_end_report+0x43/0x49 [ 68.742178] kasan_report_error.cold+0xa7/0x191 [ 68.746973] ? refcount_dec_not_one+0x9a/0xc0 [ 68.751649] __asan_report_load4_noabort+0x68/0x70 [ 68.756825] ? refcount_dec_not_one+0x9a/0xc0 [ 68.761307] refcount_dec_not_one+0x9a/0xc0 [ 68.765946] refcount_dec_and_mutex_lock+0x1a/0x60 [ 68.771045] nbd_genl_connect+0xf94/0x1400 [ 68.775468] ? nbd_xmit_timeout+0x500/0x500 [ 68.779880] ? validate_nla+0x192/0x5e0 [ 68.783844] genl_family_rcv_msg+0x572/0xb20 [ 68.788600] ? genl_rcv+0x40/0x40 [ 68.792158] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 68.797824] ? trace_hardirqs_on+0x10/0x10 [ 68.802181] ? sock_sendmsg+0xb5/0x100 [ 68.806570] genl_rcv_msg+0xaf/0x140 [ 68.810443] netlink_rcv_skb+0x125/0x390 [ 68.814718] ? genl_family_rcv_msg+0xb20/0xb20 [ 68.819644] ? netlink_ack+0x9a0/0x9a0 [ 68.823759] ? lock_acquire+0x170/0x3f0 [ 68.828019] genl_rcv+0x24/0x40 [ 68.831403] netlink_unicast+0x437/0x610 [ 68.835546] ? netlink_sendskb+0xd0/0xd0 [ 68.839690] ? __check_object_size+0x179/0x230 [ 68.844642] netlink_sendmsg+0x62e/0xb80 [ 68.848997] ? nlmsg_notify+0x170/0x170 [ 68.852958] ? kernel_recvmsg+0x210/0x210 [ 68.857408] ? security_socket_sendmsg+0x83/0xb0 [ 68.863247] ? nlmsg_notify+0x170/0x170 [ 68.867563] sock_sendmsg+0xb5/0x100 [ 68.871553] ___sys_sendmsg+0x6c8/0x800 [ 68.875777] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 68.880665] ? netlink_dump+0xad0/0xad0 [ 68.884630] ? nlmsg_notify+0x170/0x170 [ 68.888782] ? security_socket_recvmsg+0x8b/0xc0 [ 68.893889] ? SyS_recvfrom+0x27f/0x340 [ 68.898048] ? SyS_send+0x40/0x40 [ 68.901575] ? vm_insert_page+0x7c0/0x7c0 [ 68.905715] ? __fdget+0x167/0x1f0 [ 68.909450] ? sockfd_lookup_light+0xb2/0x160 [ 68.914105] __sys_sendmsg+0xa3/0x120 [ 68.918210] ? SyS_shutdown+0x160/0x160 [ 68.922266] ? up_read+0x17/0x30 [ 68.925704] ? __do_page_fault+0x159/0xad0 [ 68.930008] SyS_sendmsg+0x27/0x40 [ 68.933622] ? __sys_sendmsg+0x120/0x120 [ 68.937964] do_syscall_64+0x1d5/0x640 [ 68.942588] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 68.947909] RIP: 0033:0x450a19 [ 68.951566] RSP: 002b:00007ffd257c4128 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 68.959710] RAX: ffffffffffffffda RBX: 0000000000db73bc RCX: 0000000000450a19 [ 68.967926] RDX: 0000000000040800 RSI: 0000000020000380 RDI: 0000000000000004 [ 68.975340] RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000 [ 68.982903] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 [ 68.991154] R13: 000000000000000b R14: 00007ffd257c41e0 R15: 00000000000000c5 [ 69.000021] Kernel Offset: disabled [ 69.003733] Rebooting in 86400 seconds..