This bug was fixed in the package linux - 4.3.0-6.17
---------------
linux (4.3.0-6.17) xenial; urgency=low
[ Tim Gardner ]
* Release Tracking Bug
- LP: #1532958
[ Eric Dumazet ]
* SAUCE: (noup) net: fix IP early demux races
- LP: #1526946
[ Guilherme G. Piccoli ]
* SAUCE: powerpc/eeh: Validate arch in eeh_add_device_early()
- LP: #1486180
[ Hui Wang ]
* [Config] CONFIG_I2C_DESIGNWARE_BAYTRAIL=y, CONFIG_IOSF_MBI=y
- LP: #1527096
[ Jann Horn ]
* ptrace: being capable wrt a process requires mapped uids/gids
- LP: #1527374
[ Serge Hallyn ]
* SAUCE: add a sysctl to disable unprivileged user namespace unsharing
[ Tim Gardner ]
* [Config] CONFIG_ZONE_DEVICE=y for amd64
* [Config] CONFIG_VIRTIO_BLK=y, CONFIG_VIRTIO_NET=y for s390
- LP: #1532886
[ Upstream Kernel Changes ]
* rhashtable: Fix walker list corruption
- LP: #1526811
* rhashtable: Kill harmless RCU warning in rhashtable_walk_init
- LP: #1526811
* ovl: fix permission checking for setattr
- LP: #1528904
- CVE-2015-8660
-- Tim Gardner <tim.gard...@canonical.com> Thu, 17 Dec 2015 05:34:47
-0700
** Changed in: linux (Ubuntu Xenial)
Status: Fix Committed => Fix Released
** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2015-8660
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https://bugs.launchpad.net/bugs/1526811
Title:
SRU: walker list corruption while being intensively stressed
Status in Linux:
Unknown
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Wily:
Fix Committed
Status in linux source package in Xenial:
Fix Released
Bug description:
[SRU Justification][Wily] + [Xenial]
While stress testing with the stress-ng procfs stressor I hit a walker
list bug. This has been recently fixed by Herbert Xu in commit:
The commit ba7c95ea3870fe7b847466d39a049ab6f156aa2c ("rhashtable: Fix
sleeping inside RCU critical section in walk_stop") introduced a new
spinlock for the walker list. However, it did not convert all
existing users of the list over to the new spin lock. Some continued
to use the old mutex for this purpose. This obviously led to
corruption of the list.
[Fix]
Clean upstream cherry pick, commit c6ff5268293ef98e48a99597e765ffc417e39fa5
Will land in Xenial automatically (4.4)
[Testcase]
Run multiple instances of the attached code on a multicore system.
Alternatively, run stress-ng --procfs 0 on a multi-core system
Fix will stop the above code corrupting the list and crashing.
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