Brain server can't write above 4GB

[illyria]

OS: Win10
Hashcat: found on beta 1774, tested and verified on beta 1807

Brainserver

Code:

hc --brain-server

Client

Code:

hc -m 0 -a 0 -O -z --brain-client-features=1 --brain-password=0000000000000000 0123456789abcdef0123456789abcdef dict.dic -r rules\dive.rule

1590552137.126935 |  67.14s |  0 | Wrote 4274278992 bytes from session 0x54d586c0 in 3950.13 ms
1590552137.127936 |  0.00s |  0 | Wrote 0 bytes from attack 0xce7edf05 in 0.26 ms
1590552568.477292 | 431.35s |  1 | C |  1539.12 ms | Hashes: 1453712
1590552569.332072 |  0.85s |  1 | L |  829.34 ms | Long: 535738586, Inc: 2228224, New: 913715
1590552570.329519 |  1.00s |  1 | L |  560.60 ms | Long: 535738586, Inc: 1314509, New: 547767
1590552743.492558 | 173.16s |  0 | Wrote 4285908688 bytes from session 0x54d586c0 in 3942.89 ms
1590552743.492558 |  0.00s |  0 | Wrote 0 bytes from attack 0xce7edf05 in 0.22 ms
1590553065.668118 | 322.18s |  1 | C |  2750.89 ms | Hashes: 1461482
1590553066.538457 |  0.87s |  1 | L |  845.53 ms | Long: 537200068, Inc: 2228224, New: 962131
1590553067.523353 |  0.99s |  1 | L |  554.01 ms | Long: 537200068, Inc: 1266093, New: 561895

At this point nothing more happens, no errors. But the brain.54d586c0.ldmp file is now only 2.5MB

It seems to me that first time it tries to write to the ldmp file where write-size is above 4GB, it writes only the part above 4GB and the brain server gets stuck. At this point the brain-server can only be killed from task manager.