On 2015-6-6 00:22, Dave Chinner wrote:
Can you give more information about the crashes? From this
description, I do not know whether this is a work around or a fix
because I don't know what code is actually causing the problem or
the circumstances in which the crash occurs. Hence I cannot
determine if your change is the right change to make or whether the
documetnation is simply wrong and we have a real bug we shoul dbe
fixing.
The crashes occurred with logsunit=192k and logbsize=256k. xlog_sync() is
calculating in logsunit units:
count = XLOG_LSUNITTOB(log, XLOG_BTOLSUNIT(log, count_init));
With count_init=256k, the calculated roundoff will try to cover that in
two 192k units. This roundoff is passed to the xlog_pack_data() which
walks the buffer and (hopefully) fails when it hits its 256k border.
--
Ales Novak
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