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  1. Bug #1526811
  2. Comment #0

Comment 0 for bug 1526811

Revision history for this message
Colin Ian King (colin-king) wrote :

[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]
See: http://marc.info/?l=linux-netdev&m=145027458131396&w=2
Probably will wait until this officially lands in 4.4 or 4.5.

[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.