on geo-prism:

% /u/kolya/athena/afs/fsx/fsx -b 8100 -N 8250 -p 50 -c 100 -R -W /afs/p1/user/kolya/test/fsx

in another shell on geo-prism:

GEO-PRISM /afs/sipb/project (66)> /afs/athena/project/gnu/arch/sun4x_58/bin/gfind . -noleaf

fsx fails with:

8226(34 mod 256): TRUNCATE DOWN from 0x35f10 to 0x1cfc9
8227(35 mod 256): READ  0x13592 thru 0x147c9    (0x1238 bytes)
8228(36 mod 256): TRUNCATE UP   from 0x1cfc9 to 0x2f8cd
                CLOSE/OPEN
8229(37 mod 256): WRITE 0x3b16 thru 0x10bdd     (0xd0c8 bytes)
Correct content saved for comparison
(maybe hexdump "/afs/p1/user/kolya/test/fsx" vs "/afs/p1/user/kolya/test/fsx.fsxgood")

[file ends up being 0x30000 bytes rather than 0x2f8cd]