Can't run MySQL + RocksDB on top of BetrFS

[malvag]

Hi there, i'm trying to run MySQL with RocksDB as its storage engine on top of BetrFS.

I followed mostly this guide for the setup of Mysql and rocksdb and used your eurosys-artifact-evaluation scripts for setting up BetrFS.

Linkbench was used for benchmarking. So things then went south.. When i started the request phase of the benchmark i encountered a stack trace in kernel, bellow...

Any thoughts on this ?

[  +0.007333] kernel BUG at /home/malvag/betrfs-eurosys22-artifact/betrfs/filesystem/nb_readahead.c:548!
[  +0.000616] invalid opcode: 0000 [#1] SMP NOPTI
[  +0.000533] CPU: 6 PID: 2934 Comm: mariadbd Tainted: G        W  OE     4.19.99-betrfs-v0.6 #1
[  +0.000001] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS Arch Linux 1.16.0-2-2 04/01/2014
[  +0.000125] RIP: 0010:ftfs_page_cache_sync_readahead.part.15+0x5/0x10 [ftfs]
[  +0.000003] Code: f7 b8 02 00 00 00 48 c1 ef 02 48 d3 e0 48 39 d7 48 0f 42 c6 c3 b8 04 00 00 00 48 d3 e0 c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 <0f> 0b 66 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 57 41 56 41 55
[  +0.002747] RSP: 0018:ffffa56acb4e3dd0 EFLAGS: 00010202
[  +0.000001] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
[  +0.000000] RDX: ffff930b41058700 RSI: 00008d9536000102 RDI: ffff930bf4099a38
[  +0.000001] RBP: 0000000000000000 R08: 0000000000000003 R09: ffff930b410586d8
[  +0.000000] R10: 0000000000000040 R11: ffffa56acb4e3d68 R12: 0000000000000000
[  +0.000001] R13: ffffa56acb4e3f10 R14: ffff930bf0849300 R15: 0000000000000000
[  +0.000001] FS:  00007f18c6bbf700(0000) GS:ffff930bf7b80000(0000) knlGS:0000000000000000
[  +0.000000] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  +0.000001] CR2: 00007f18c6bbb4b0 CR3: 0000000270b94003 CR4: 0000000000760ee0
[  +0.000002] PKRU: 55555554
[  +0.000000] Call Trace:
[  +0.000037]  ftfs_file_read_iter+0x4a2/0x5a0 [ftfs]
[  +0.006184]  __vfs_read+0x10f/0x190
[  +0.000001]  vfs_read+0x89/0x130
[  +0.000002]  ksys_pread64+0x71/0x90
[  +0.000001]  do_syscall_64+0x55/0x110
[  +0.000002]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  +0.000003] RIP: 0033:0x7f1900f7908f
[  +0.000001] Code: 89 cd 55 53 49 89 d4 48 89 f5 89 fb 48 83 ec 18 e8 76 f0 ff ff 4d 89 ea 41 89 c0 4c 89 e2 48 89 ee 89 df b8 11 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 ac f0 ff ff 48
[  +0.000001] RSP: 002b:00007f18c6bbaf00 EFLAGS: 00000293 ORIG_RAX: 0000000000000011
[  +0.000000] RAX: ffffffffffffffda RBX: 000000000000007c RCX: 00007f1900f7908f
[  +0.000001] RDX: 0000000000002772 RSI: 00007f18680192f0 RDI: 000000000000007c
[  +0.000000] RBP: 00007f18680192f0 R08: 0000000000000000 R09: 00007f18c6bbb130
[  +0.000001] R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000002772
[  +0.000000] R13: 0000000000000000 R14: 0000000000000000 R15: 00007f18c6bbb150
[  +0.000001] Modules linked in: ftfs(OE) simplefs(OE) kvm_intel kvm irqbypass snd_hda_codec_generic crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_hda_intel snd_hda_codec pcbc snd_hda_core aesni_intel snd_hwdep aes_x86_64 snd_pcm crypto_simd cryptd glue_helper input_leds snd_seq_midi snd_seq_midi_event joydev snd_rawmidi serio_raw snd_seq virtio_gpu snd_seq_device snd_timer ttm drm_kms_helper snd drm lpc_ich soundcore fb_sys_fops syscopyarea sysfillrect mac_hid sysimgblt sch_fq_codel parport_pc ppdev lp parport virtio_rng ip_tables x_tables autofs4 hid_generic usbhid hid psmouse virtio_scsi ahci libahci
[  +0.000093] ---[ end trace a19d386b69909930 ]---