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Type:
Bug
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Status: Resolved
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Priority:
Critical
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Resolution: Fixed
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Affects Version/s: Lustre 2.13.0
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Fix Version/s: Lustre 2.13.0, Lustre 2.12.1
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Labels:None
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Severity:3
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Rank (Obsolete):9223372036854775807
This code was introduced by bz 18015 https://bugzilla.lustre.org/show_bug.cgi?id=18015
Newer kernels rename that symbol and it's not used anyway, but also at least in RHEL 7.[345] there's bug in this functionality htat leads to use after frees that are seen prominently in our nfs testing in maloo (in addition to my testrig). See LU-11063.
Example nfs failures:
https://testing.whamcloud.com/test_sessions/1cd5592c-8319-4aa7-aa2b-4549a83ce9cd
https://testing.whamcloud.com/test_sessions/9e6c8dec-d1dd-4ad4-b028-f98b5fdf63a9
Anyway after reviewing the original patch I think we just need to get rid of this flag altogether and if the rapid load/unload is still a problem, work it around in some better more robust way.