Спасите! Не втягивается огромный MySQL-dump!

В общем, это всё я. Вот уже 18 часов кряду пытаюсь перевести свой форум на UTF8 и, соответственно, MySQL 4.1

В общем, после великого множества мучений, связанного с кодировками, пытаюсь втащить 400-мегабайтный дамп в cp1251, без перекодирвки, сделанный из 4.0.16

Упорно через некоторе время работы:
ERROR 2013 at line 22578: Lost connection to MySQL server during query

Помогите разобратья, тысяча человек народа сидит, страдает и ждёт :-/

В этой строчке вполне безобидный маленький INSERT, на ~1кБ. Валится стабильно и на одной и той же строке. В логе:

mysqld got signal 11;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
We will try our best to scrape up some info that will hopefully help diagnose
the problem, but since we have already crashed, something is definitely wrong
and this may fail.

key_buffer_size=16777216
read_buffer_size=520192
max_used_connections=1
max_connections=50
threads_connected=1
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_connections = 67383 K
bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

thd=0x84da070
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
Cannot determine thread, fp=0x417f5cc8, backtrace may not be correct.
Stack range sanity check OK, backtrace follows:
0x811c628
0x40024f05
...
...
0x420e792a
New value of fp=(nil) failed sanity check, terminating stack trace!
Please read http://www.mysql.com/doc/en/Using_stack_trace.html and follow instructions on how to r
stack trace is much more helpful in diagnosing the problem, so please do
resolve it
Trying to get some variables.
Some pointers may be invalid and cause the dump to abort...
thd->query at 0x8536958 = INSERT INTO ib_posts VALUES (0,NULL,17396,'1-2497',1,261,'Flogger-B',1,1
thd->thread_id=45
The manual page at http://www.mysql.com/doc/en/Crashing.html contains
information that should help you find out what is causing the crash.

Number of processes running now: 0
040217 00:53:35 mysqld restarted

Linux RH7.3, на винтах места дофига, 2x1800 Xeon, 512RAM.
my.cnf:
...
[mysqld]
back_log = 20
datadir = /usr/local/var
port = 3306
socket = /var/lib/mysql/mysql.sock
skip-locking
key_buffer = 16M
max_allowed_packet = 8M
max_connections = 50
table_cache = 256
sort_buffer_size = 512K
read_buffer_size = 512K
myisam_sort_buffer_size = 8M
...