Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.145' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 32.332807] netlink: 4 bytes leftover after parsing attributes in process `syz-executor973'. [ 32.344440] netlink: 4 bytes leftover after parsing attributes in process `syz-executor973'. [ 32.354143] netlink: 4 bytes leftover after parsing attributes in process `syz-executor973'. [ 32.363231] netlink: 4 bytes leftover after parsing attributes in process `syz-executor973'. executing program [ 32.421416] netlink: 4 bytes leftover after parsing attributes in process `syz-executor973'. [ 32.430331] netlink: 4 bytes leftover after parsing attributes in process `syz-executor973'. [ 32.439130] netlink: 4 bytes leftover after parsing attributes in process `syz-executor973'. [ 32.447705] netlink: 4 bytes leftover after parsing attributes in process `syz-executor973'. executing program executing program [ 32.501393] netlink: 4 bytes leftover after parsing attributes in process `syz-executor973'. [ 32.511712] netlink: 4 bytes leftover after parsing attributes in process `syz-executor973'. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 36.424208] ------------[ cut here ]------------ [ 36.430094] refcount_t: underflow; use-after-free. [ 36.436132] WARNING: CPU: 0 PID: 8801 at lib/refcount.c:280 refcount_dec_not_one+0x1bc/0x1d0 [ 36.444709] Kernel panic - not syncing: panic_on_warn set ... [ 36.444709] [ 36.452054] CPU: 0 PID: 8801 Comm: syz-executor973 Not tainted 4.19.211-syzkaller #0 [ 36.459912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.469242] Call Trace: [ 36.471814] dump_stack+0x1fc/0x2ef [ 36.475425] panic+0x26a/0x50e [ 36.478597] ? __warn_printk+0xf3/0xf3 [ 36.482469] ? refcount_dec_not_one+0x1bc/0x1d0 [ 36.487119] ? __probe_kernel_read+0x130/0x1b0 [ 36.491679] ? __warn.cold+0x5/0x5a [ 36.495286] ? __warn+0xe4/0x200 [ 36.498635] ? refcount_dec_not_one+0x1bc/0x1d0 [ 36.503287] __warn.cold+0x20/0x5a [ 36.506935] ? io_schedule_timeout+0x140/0x140 [ 36.511515] ? refcount_dec_not_one+0x1bc/0x1d0 [ 36.516177] report_bug+0x262/0x2b0 [ 36.519821] do_error_trap+0x1d7/0x310 [ 36.523701] ? math_error+0x310/0x310 [ 36.527486] ? irq_work_claim+0xa6/0xc0 [ 36.531454] ? irq_work_queue+0x29/0x80 [ 36.535420] ? error_entry+0x72/0xd0 [ 36.539213] ? trace_hardirqs_off_caller+0x6e/0x210 [ 36.544214] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 36.549044] invalid_op+0x14/0x20 [ 36.552509] RIP: 0010:refcount_dec_not_one+0x1bc/0x1d0 [ 36.557769] Code: 1d d5 96 98 07 31 ff 89 de e8 f0 71 ec fd 84 db 75 89 e8 b7 70 ec fd 48 c7 c7 e0 c0 b3 88 c6 05 b5 96 98 07 01 e8 89 a8 7c 04 <0f> 0b 41 bc 01 00 00 00 e9 6a ff ff ff e8 22 91 c1 fd 66 90 41 54 [ 36.576652] RSP: 0018:ffff8880902df4a8 EFLAGS: 00010286 [ 36.581994] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 36.589339] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed101205be87 [ 36.596594] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 [ 36.603844] R10: 0000000000000005 R11: 0000000000000000 R12: 00000000ffffffff [ 36.611096] R13: 1ffff1101205be96 R14: ffff8880902df4d0 R15: ffff8880a5ecd8a8 [ 36.618358] ? vprintk_func+0x81/0x180 [ 36.622229] ? refcount_dec_not_one+0x1bc/0x1d0 [ 36.626880] ? __mutex_unlock_slowpath+0xea/0x610 [ 36.631714] ? refcount_dec_and_test_checked+0x20/0x20 [ 36.636975] ? wait_for_completion_io+0x10/0x10 [ 36.641625] refcount_dec_and_mutex_lock+0x1c/0x80 [ 36.646536] nbd_config_put+0x5bb/0x870 [ 36.650496] nbd_genl_connect+0x11bb/0x1630 [ 36.654801] ? nbd_xmit_timeout+0x730/0x730 [ 36.659104] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 36.664297] ? validate_nla+0x270/0x820 [ 36.668274] ? nla_parse+0x1b2/0x290 [ 36.671973] genl_family_rcv_msg+0x642/0xc40 [ 36.676374] ? genl_rcv+0x40/0x40 [ 36.679825] ? genl_rcv_msg+0x12f/0x160 [ 36.683778] ? mutex_trylock+0x1a0/0x1a0 [ 36.687824] ? __radix_tree_lookup+0x216/0x370 [ 36.692387] genl_rcv_msg+0xbf/0x160 [ 36.696086] netlink_rcv_skb+0x160/0x440 [ 36.700130] ? genl_family_rcv_msg+0xc40/0xc40 [ 36.704697] ? netlink_ack+0xae0/0xae0 [ 36.708569] ? genl_rcv+0x15/0x40 [ 36.712004] genl_rcv+0x24/0x40 [ 36.715263] netlink_unicast+0x4d5/0x690 [ 36.719306] ? netlink_sendskb+0x110/0x110 [ 36.723527] ? _copy_from_iter_full+0x229/0x7c0 [ 36.728175] ? __phys_addr_symbol+0x2c/0x70 [ 36.732477] ? __check_object_size+0x17b/0x3e0 [ 36.737055] netlink_sendmsg+0x6c3/0xc50 [ 36.741104] ? aa_af_perm+0x230/0x230 [ 36.744905] ? nlmsg_notify+0x1f0/0x1f0 [ 36.748863] ? kernel_recvmsg+0x220/0x220 [ 36.753007] ? nlmsg_notify+0x1f0/0x1f0 [ 36.756972] sock_sendmsg+0xc3/0x120 [ 36.760678] ___sys_sendmsg+0x7bb/0x8e0 [ 36.764654] ? copy_msghdr_from_user+0x440/0x440 [ 36.769388] ? netlink_dump+0xc10/0xc10 [ 36.773346] ? nlmsg_notify+0x1f0/0x1f0 [ 36.777306] ? security_socket_recvmsg+0x8f/0xc0 [ 36.782047] ? __sys_recvfrom+0x2cd/0x3a0 [ 36.786183] ? __ia32_sys_send+0x100/0x100 [ 36.790409] ? __fdget+0x1a0/0x230 [ 36.793938] __x64_sys_sendmsg+0x132/0x220 [ 36.798154] ? __sys_sendmsg+0x1b0/0x1b0 [ 36.802288] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 36.807814] ? trace_hardirqs_off_caller+0x6e/0x210 [ 36.812814] ? do_syscall_64+0x21/0x620 [ 36.816770] do_syscall_64+0xf9/0x620 [ 36.820553] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 36.825720] RIP: 0033:0x7f213a9f4a09 [ 36.829415] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 14 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 36.848294] RSP: 002b:00007ffd6e854e78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 36.855983] RAX: ffffffffffffffda RBX: 00000000000f4240 RCX: 00007f213a9f4a09 [ 36.863237] RDX: 0000000000000000 RSI: 0000000020000340 RDI: 0000000000000003 [ 36.870485] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 36.877734] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000008ce9 [ 36.884990] R13: 00007ffd6e854e8c R14: 00007ffd6e854ea0 R15: 00007ffd6e854e90 [ 36.892636] Kernel Offset: disabled [ 36.896304] Rebooting in 86400 seconds..