** Changed in: linux (Ubuntu Wily)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1526811
Title:
SRU: walker list corruption while being intensively stressed
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Wily:
Fix Committed
Status in linux source package in Xenial:
Fix Committed
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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