Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program [ 27.968824] netlink: 4 bytes leftover after parsing attributes in process `syz-executor361'. [ 27.978277] netlink: 4 bytes leftover after parsing attributes in process `syz-executor361'. [ 27.987810] netlink: 4 bytes leftover after parsing attributes in process `syz-executor361'. [ 27.996716] netlink: 4 bytes leftover after parsing attributes in process `syz-executor361'. executing program [ 28.051373] netlink: 4 bytes leftover after parsing attributes in process `syz-executor361'. [ 28.062825] netlink: 4 bytes leftover after parsing attributes in process `syz-executor361'. [ 28.072105] netlink: 4 bytes leftover after parsing attributes in process `syz-executor361'. [ 28.081607] netlink: 4 bytes leftover after parsing attributes in process `syz-executor361'. executing program executing program [ 28.120763] netlink: 4 bytes leftover after parsing attributes in process `syz-executor361'. [ 28.129572] netlink: 4 bytes leftover after parsing attributes in process `syz-executor361'. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 29.276723] refcount_t: underflow; use-after-free. [ 29.282251] ------------[ cut here ]------------ [ 29.287014] WARNING: CPU: 1 PID: 8125 at lib/refcount.c:281 refcount_dec_not_one.cold+0x18/0x25 [ 29.295831] Kernel panic - not syncing: panic_on_warn set ... [ 29.295831] [ 29.303270] CPU: 1 PID: 8125 Comm: syz-executor361 Not tainted 4.14.294-syzkaller #0 [ 29.311143] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 [ 29.320602] Call Trace: [ 29.323205] dump_stack+0x1b2/0x281 [ 29.326820] panic+0x1f9/0x42d [ 29.330000] ? add_taint.cold+0x16/0x16 [ 29.333976] ? refcount_dec_not_one.cold+0x18/0x25 [ 29.338885] ? refcount_dec_not_one.cold+0x18/0x25 [ 29.343893] __warn.cold+0x20/0x44 [ 29.347426] ? ist_end_non_atomic+0x10/0x10 [ 29.351891] ? refcount_dec_not_one.cold+0x18/0x25 [ 29.356803] report_bug+0x208/0x250 [ 29.360412] do_error_trap+0x195/0x2d0 [ 29.364282] ? math_error+0x2d0/0x2d0 [ 29.368077] ? ___preempt_schedule+0x16/0x18 [ 29.372478] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.377399] invalid_op+0x1b/0x40 [ 29.381042] RIP: 0010:refcount_dec_not_one.cold+0x18/0x25 [ 29.386556] RSP: 0018:ffff88809515f5e8 EFLAGS: 00010282 [ 29.391895] RAX: 0000000000000026 RBX: 0000000000000000 RCX: 0000000000000000 [ 29.399139] RDX: 0000000000000000 RSI: ffffffff878bc9e0 RDI: ffffed1012a2beb3 [ 29.406385] RBP: ffff8880b3f67198 R08: 0000000000000026 R09: 0000000000000000 [ 29.413629] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff [ 29.421153] R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880b3f671a8 [ 29.428414] ? refcount_dec_not_one.cold+0x18/0x25 [ 29.433411] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 29.438408] refcount_dec_and_mutex_lock+0x1a/0x60 [ 29.443324] nbd_config_put+0x442/0x6c0 [ 29.447281] ? wait_for_completion_io+0x10/0x10 [ 29.451931] nbd_genl_connect+0xcb9/0x13e0 [ 29.456159] ? nbd_xmit_timeout+0x500/0x500 [ 29.460458] ? __mutex_lock+0x356/0x1310 [ 29.464525] ? validate_nla+0x192/0x5e0 [ 29.468500] genl_family_rcv_msg+0x572/0xb20 [ 29.472927] ? genl_rcv+0x40/0x40 [ 29.476465] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 29.481932] ? trace_hardirqs_on+0x10/0x10 [ 29.486152] genl_rcv_msg+0xaf/0x140 [ 29.489945] netlink_rcv_skb+0x125/0x390 [ 29.493995] ? genl_family_rcv_msg+0xb20/0xb20 [ 29.498564] ? netlink_ack+0x9a0/0x9a0 [ 29.502445] ? lock_acquire+0x170/0x3f0 [ 29.506426] genl_rcv+0x24/0x40 [ 29.509685] netlink_unicast+0x437/0x610 [ 29.513742] ? netlink_sendskb+0xd0/0xd0 [ 29.517820] ? __check_object_size+0x179/0x230 [ 29.522387] netlink_sendmsg+0x648/0xbc0 [ 29.526442] ? nlmsg_notify+0x1b0/0x1b0 [ 29.530393] ? kernel_recvmsg+0x210/0x210 [ 29.534667] ? security_socket_sendmsg+0x83/0xb0 [ 29.539517] ? nlmsg_notify+0x1b0/0x1b0 [ 29.543590] sock_sendmsg+0xb5/0x100 [ 29.547283] ___sys_sendmsg+0x6c8/0x800 [ 29.551252] ? copy_msghdr_from_user+0x3b0/0x3b0 [ 29.555996] ? netlink_dump+0xb90/0xb90 [ 29.559962] ? nlmsg_notify+0x1b0/0x1b0 [ 29.563918] ? security_socket_recvmsg+0x8b/0xc0 [ 29.568652] ? SyS_recvfrom+0x27f/0x340 [ 29.572610] ? SyS_send+0x40/0x40 [ 29.576058] ? vm_insert_page+0x7c0/0x7c0 [ 29.580184] ? __fdget+0x167/0x1f0 [ 29.583699] ? sockfd_lookup_light+0xb2/0x160 [ 29.588172] __sys_sendmsg+0xa3/0x120 [ 29.591948] ? SyS_shutdown+0x160/0x160 [ 29.595927] ? up_read+0x17/0x30 [ 29.599342] ? __do_page_fault+0x159/0xad0 [ 29.603664] SyS_sendmsg+0x27/0x40 [ 29.607204] ? __sys_sendmsg+0x120/0x120 [ 29.611254] do_syscall_64+0x1d5/0x640 [ 29.615128] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 29.620300] RIP: 0033:0x7f11de28ba99 [ 29.623991] RSP: 002b:00007ffc507ff5e8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 29.631680] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f11de28ba99 [ 29.638931] RDX: 0000000000004080 RSI: 0000000020000280 RDI: 0000000000000003 [ 29.646179] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 29.653430] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000703f [ 29.660688] R13: 00007ffc507ff5fc R14: 00007ffc507ff610 R15: 00007ffc507ff600 [ 29.668318] Kernel Offset: disabled [ 29.672012] Rebooting in 86400 seconds..