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[DragonFlyBSD - Bug #2374] softupdates locking bug

From: Venkatesh Srinivas via Redmine <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 16 Aug 2012 22:10:15 -0700

Issue #2374 has been updated by Venkatesh Srinivas.

Commit 8224c9ea7d94389a63b07be4401f0b05912f8f4a likely fixes this bug; getdirtybuf could return success incorrectly earlier.
Bug #2374: softupdates locking bug

Author: Venkatesh Srinivas
Status: New
Priority: Normal
Target version: 

softupdates may still have some locking issues:

In -master:
* http://leaf.dragonflybsd.org/~marino/core/core.20120523.txt
Panic where softdep_update_inodeblock() called bwrite() with a NULL buffer

getdirtybuf returned 'gotit', yet it either returned a NULL bp or the buffer was nulled after
it was saved in the inodedep structure. getdirtybuf can block and does release the softdep
lock while locking dirty buffers, but it is not clear if anyone can race in and result in the failure mode seen.

* (from 3.0.3 catchall bug (2336)):
Deadlock in -master with softdep. No more details available.

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