[  324.183415] EXT4-fs (nbd3): mounted filesystem with ordered data mode. Opts: 
[  339.430326] block nbd3: Receive control failed (result -32)
[  339.430565] block nbd3: shutting down sockets
[  339.440908] print_req_error: I/O error, dev nbd3, sector 0
[  339.441478] print_req_error: I/O error, dev nbd3, sector 0
[  339.441492] print_req_error: I/O error, dev nbd3, sector 0
[  339.441501] print_req_error: I/O error, dev nbd3, sector 0
[  339.441548] ------------[ cut here ]------------
[  339.441550] kernel BUG at fs/buffer.c:3064!
[  339.441557] invalid opcode: 0000 [#1] SMP PTI
[  339.441559] Modules linked in: btrfs xor zstd_compress raid6_pq zstd_decompress xxhash loop fuse nbd xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables devlink ccm vfat fat ath3k btusb btrtl btbcm btintel bluetooth ecdh_generic intel_rapl asus_nb_wmi x86_pkg_temp_thermal iTCO_wdt intel_powerclamp asus_wmi iTCO_vendor_support snd_hda_codec_realtek sparse_keymap arc4 coretemp snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel ath9k kvm_intel ath9k_common ath9k_hw snd_hda_codec kvm mac80211 snd_hda_core nouveau snd_hwdep snd_seq snd_seq_device snd_pcm irqbypass mxm_wmi crct10dif_pclmul ath crc32_pclmul ghash_clmulni_intel
[  339.441613]  ttm intel_cstate intel_uncore rtsx_pci_ms snd_timer cfg80211 intel_rapl_perf snd i915 memstick intel_pch_thermal rfkill joydev soundcore int3400_thermal shpchp acpi_thermal_rel processor_thermal_device i2c_algo_bit wmi video drm_kms_helper int3402_thermal int340x_thermal_zone mei_me intel_soc_dts_iosf asus_wireless drm lpc_ich mei i2c_i801 rtsx_pci_sdmmc mmc_core serio_raw r8169 crc32c_intel rtsx_pci mii
[  339.441645] CPU: 1 PID: 14729 Comm: qemu-nbd Not tainted 4.15.15-300.fc27.x86_64 #1
[  339.441647] Hardware name: ASUSTeK COMPUTER INC. X550LN/X550LN, BIOS X550LN.306 06/26/2014
[  339.441653] RIP: 0010:submit_bh_wbc+0x17b/0x190
[  339.441655] RSP: 0018:ffffa17d082c7cc0 EFLAGS: 00010246
[  339.441658] RAX: 0000000004000005 RBX: ffff9349aaab3bc8 RCX: 0000000000000000
[  339.441661] RDX: ffff9349aaab3bc8 RSI: 0000000000060800 RDI: 0000000000000001
[  339.441663] RBP: ffff9349b0d6e800 R08: 0000000000000000 R09: 0000000000000000
[  339.441665] R10: 0000000000000000 R11: 00000000000001d2 R12: ffff9349b0d6e824
[  339.441667] R13: 0000000000060800 R14: ffff9349837fa000 R15: ffff9349751c65a8
[  339.441670] FS:  00007fd8108d0180(0000) GS:ffff9349eee80000(0000) knlGS:0000000000000000
[  339.441672] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  339.441675] CR2: 00007f3bce4ffa08 CR3: 000000017320a001 CR4: 00000000001606e0
[  339.441676] Call Trace:
[  339.441686]  jbd2_write_superblock+0xfa/0x230
[  339.441693]  ? __schedule+0x247/0x880
[  339.441696]  ? __wake_up_common_lock+0x89/0xc0
[  339.441700]  jbd2_mark_journal_empty+0x6f/0x90
[  339.441703]  jbd2_journal_destroy+0x252/0x290
[  339.441706]  ? finish_wait+0x80/0x80
[  339.441711]  ext4_put_super+0x7a/0x3d0
[  339.441716]  generic_shutdown_super+0x6c/0x110
[  339.441719]  kill_block_super+0x21/0x50
[  339.441723]  deactivate_locked_super+0x3f/0x70
[  339.441728]  cleanup_mnt+0x3b/0x70
[  339.441732]  task_work_run+0x84/0xa0
[  339.441739]  do_exit+0x2dc/0xbb0
[  339.441743]  do_group_exit+0x3a/0xa0
[  339.441747]  SyS_exit_group+0x10/0x10
[  339.441752]  do_syscall_64+0x74/0x180
[  339.441756]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[  339.441760] RIP: 0033:0x7fd80e1fc838
[  339.441762] RSP: 002b:00007ffe1ec0bd28 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
[  339.441765] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd80e1fc838
[  339.441767] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
[  339.441769] RBP: 00007fd80e4e58b8 R08: 00000000000000e7 R09: fffffffffffffda8
[  339.441771] R10: 00007fd80cd3ebc0 R11: 0000000000000246 R12: 00007fd80e4e58b8
[  339.441773] R13: 00007fd80e4ead60 R14: 0000000000000001 R15: 0000000000000003
[  339.441776] Code: e0 44 89 e7 44 09 ef 89 7d 10 48 89 ef e8 4e d9 13 00 31 c0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 f0 80 62 01 f7 e9 f3 fe ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b 90 66 2e 0f 1f 84 00 00 00 00 00 
[  339.441818] RIP: submit_bh_wbc+0x17b/0x190 RSP: ffffa17d082c7cc0
[  339.441838] ---[ end trace 7dba6e3035bfec46 ]---
[  339.441840] Fixing recursive fault but reboot is needed!