lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Date:	Wed, 13 Aug 2014 12:58:07 -0400
From:	Milosz Tanski <milosz@...in.com>
To:	linux-cachefs@...hat.com
CC:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	David Howells <dhowells@...hat.com>, NeilBrown <neilb@...e.de>
Subject: [PATCH 0/3] FS-Cache: Bug fixes for bugs that happen under vma pressure
 v2

FS-Cache has a few bugs generally only get tried in error mode / under
VMA preassure. The problem is exacerbated when majority of the IO is
cacheable netfs IO. At that point there are few pages that are evictable
due to GPF_NOFS allocation strategies.

The first bug is a recursive hang caused by fscache write out to ext4
which in turn needs to allocate pages and ends up calling releasepages()
on the netfs.

The second two bugs are cookie ref count bugs that happen when in the
error cases (mostly from related memory alloc failures).

This is the second try at this with Sign-Off lines, suggestions from
David and debug log on time out. With the log line we can further
investigate how often this happens and be smarter with the timeout (if
need be).

Milosz Tanski (3):
  FS-Cache: Timeout for releasepage()
  FS-Cache: Reduce cookie ref count if submit fails.
  FS-Cache: refcount becomes corrupt under vma pressure.

 fs/fscache/object.c |    2 ++
 fs/fscache/page.c   |   26 ++++++++++++++++++++++----
 2 files changed, 24 insertions(+), 4 deletions(-)

-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists