Failed to open lmdb environment: Invalid argument

[chrissound]

Running this in a qemu vm.

[130] root@nixos> monerod --data-dir /mount/moneromount/mon-block                                                                        /mount
2020-05-14 22:36:05.954	I Monero 'Carbon Chamaeleon' (v0.15.0.0-unknown)
2020-05-14 22:36:05.954	I Initializing cryptonote protocol...
2020-05-14 22:36:05.954	I Cryptonote protocol initialized OK
2020-05-14 22:36:05.954	I Initializing core...
2020-05-14 22:36:05.955	I Loading blockchain from folder /mount/moneromount/mon-block/lmdb ...
2020-05-14 22:36:05.957	W Failed to open lmdb environment: Invalid argument
2020-05-14 22:36:05.961	E Error opening database: Failed to open lmdb environment: Invalid argument
2020-05-14 22:36:05.963	I Stopping cryptonote protocol...
2020-05-14 22:36:05.963	I Cryptonote protocol stopped successfully
2020-05-14 22:36:05.964	E Exception in main! Failed to initialize core

Version:

[1] root@nixos> monerod --version                                                                                                        /mount
Monero 'Carbon Chamaeleon' (v0.15.0.0-unknown)

[chrissound]

Works correctly if I don't mount the vm mount path..

[127] root@nixos> mount | grep mon                                                                                                       /mount
a457b9c00b7152b02ceea27e7fe1a07 on /mount/moneromount type 9p (rw,relatime,sync,dirsync,access=client,trans=virtio)

I suppose something to do with the 9p mount type?

[hyc]

Most likely that 9p filesystem doesn't support mmap.

[moneromooo-monero]

#6536 will make it clear when a lmdb init failure is due to mmap. Assuming lmdb doens't need support for more fancy usage hyc ?

[hyc]

Well.... it should be enough that mmap works. But there are things like WSL that may still fail.
microsoft/WSL#3451 (comment)