fscrypt hangs indefinitely on `setup` and `status` commands

[Flamefire]

I want to setup fscrypt on a HPC cluster using Lustre & NFS.

However the first step already fails. When I run fscrypt setup as root it hangs forever.

# fscrypt setup --verbose
2026/03/16 13:04:56 Kernel version is 5.14.0-570.49.1.el9_6.x86_64
Defaulting to policy_version 2 because kernel supports it.
Customizing passphrase hashing difficulty for this system...
2026/03/16 13:04:56 Finding hashing costs that take 1s
2026/03/16 13:04:56 Min Costs={time:1  memory:2040  parallelism:255  truncation_fixed:true}	-> 80.401µs
2026/03/16 13:04:56 Costs={time:1  memory:4080  parallelism:255  truncation_fixed:true}	-> 112.285µs
2026/03/16 13:04:56 Costs={time:1  memory:8160  parallelism:255  truncation_fixed:true}	-> 124.243µs
2026/03/16 13:04:56 Costs={time:1  memory:16320  parallelism:255  truncation_fixed:true}	-> 223.773µs
2026/03/16 13:04:56 Costs={time:1  memory:32640  parallelism:255  truncation_fixed:true}	-> 349.192µs
2026/03/16 13:04:56 Costs={time:1  memory:65280  parallelism:255  truncation_fixed:true}	-> 524.643µs
2026/03/16 13:04:56 Costs={time:1  memory:130560  parallelism:255  truncation_fixed:true}	-> 1.548767ms
2026/03/16 13:04:56 Costs={time:1  memory:131072  parallelism:255  truncation_fixed:true}	-> 1.90042ms
2026/03/16 13:04:57 Costs={time:2  memory:131072  parallelism:255  truncation_fixed:true}	-> 7.188223ms
2026/03/16 13:04:57 Costs={time:4  memory:131072  parallelism:255  truncation_fixed:true}	-> 20.034908ms
2026/03/16 13:04:57 Costs={time:8  memory:131072  parallelism:255  truncation_fixed:true}	-> 44.863474ms
2026/03/16 13:04:57 Costs={time:16  memory:131072  parallelism:255  truncation_fixed:true}	-> 96.694619ms
2026/03/16 13:04:58 Costs={time:32  memory:131072  parallelism:255  truncation_fixed:true}	-> 127.422622ms
2026/03/16 13:04:59 Costs={time:64  memory:131072  parallelism:255  truncation_fixed:true}	-> 152.654053ms
2026/03/16 13:05:00 Costs={time:128  memory:131072  parallelism:255  truncation_fixed:true}	-> 300.801486ms
2026/03/16 13:05:03 Costs={time:256  memory:131072  parallelism:255  truncation_fixed:true}	-> 591.775448ms
2026/03/16 13:05:07 Costs={time:512  memory:131072  parallelism:255  truncation_fixed:true}	-> 1.084762271s
2026/03/16 13:05:07 Creating config at "/etc/fscrypt.conf" with source:custom_passphrase  hash_costs:{time:467  memory:131072  parallelism:255  truncation_fixed:true}  options:{padding:32  contents:AES_256_XTS  filenames:AES_256_CTS  policy_version:2}
Created global config file at "/etc/fscrypt.conf".
2026/03/16 13:05:07 Reading config from "/etc/fscrypt.conf"
2026/03/16 13:05:07 creating context for user "root"

I cannot tell what it exactly does but it shows high CPU utilization.

When I run fscript status it also hangs but contrary to fscrypt setup cannot be aborted by CTRL+C and shows no CPU utilization.
Even with --verbose I get no output at all.

Any ideas what can cause this or how to debug and resolve this?

[ebiggers]

strace might help in case it's hanging reading from a filesystem.

Please also note the following from the README:

Please note that Lustre is not part of the upstream Linux kernel, and its encryption implementation has not been reviewed by the authors of fscrypt. Questions/issues about Lustre encryption should be directed to the Lustre developers.

[Flamefire]

strace didn't show anything suspicious.
I found the issue at an unexpected point: One storage server was timing out. Not sure if this is something where more logging from fscrypt could have helped to at least know it was e.g. trying to write a file or whatever it did when the timeout hit.