On Linux, v9fs's p9_errstr2errno() converts returned error strings from 9P to POSIX-style errno.h codes; while permission denied maps to EACCES as would be expected, permission denied. is not on the magical list, and causes things to output stuff like Unknown error 526.
https://github.com/droyo/styx/blob/91faf1aa2e2dfefdc08208ea3893808368899b8d/request.go#L71
On Linux, v9fs's
p9_errstr2errno()converts returned error strings from 9P to POSIX-styleerrno.hcodes; whilepermission deniedmaps toEACCESas would be expected,permission denied.is not on the magical list, and causes things to output stuff likeUnknown error 526.