Finn Thain writes: > > On Sun, 21 Feb 2016, Mikael Pettersson wrote: > > > I've done two git bisects on this. The first one was inconclusive > > (pointed to a harmless commit), but the second one ended up with: > > > > # first bad commit: [ac4de9543aca59f2b763746647577302fbedd57e] Merge > > branch 'akpm' (patches from Andrew Morton) > > > > That's a big pile of VM changes, so I think it could be the culprit. > > I think this issue may date back to v2.6.38 or earlier. > > The redhat.com bug report was closed in 2012 but Fedora users were still > seeing the problem after it was supposedly fixed. > https://bugzilla.redhat.com/show_bug.cgi?id=712019 > > That page also has a link to the bug report for Ubuntu: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/484045 > > BTW, I came across this recently: "Rik van Riel pointed out that [the > kswapd thread] tends to be slow for [the purpose of compaction], and it > can get stuck in a shrinker somewhere waiting for a lock." > http://lwn.net/Articles/684611/ > > Perhaps a stack trace would help to ascertain whether this is the same > known bug or not (?) > > --
FWIW, my latest round(s) of bisects identified the following: fdbadebec27cc92358ed4f593e8763cf10b82687 is the first bad commit commit fdbadebec27cc92358ed4f593e8763cf10b82687 Author: Li Zefan <[email protected]> Date: Thu Sep 12 15:13:19 2013 -0700 memcg: remove redundant code in mem_cgroup_force_empty_write() vfs guarantees the cgroup won't be destroyed, so it's redundant to get a css reference. Signed-off-by: Li Zefan <[email protected]> Acked-by: Michal Hocko <[email protected]> Cc: KAMEZAWA Hiroyuki <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Tejun Heo <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]> :040000 040000 1f6b5b056995067c7c60e6f87e9cd1f181e8fbeb ea29d63e70ce2320e144fac7b157a146d41360bf M mm This appears to be the first commit in the merge (git bisect refuses to bisect before it), so either it's it or the problem predates the merge. -- To unsubscribe from this list: send the line "unsubscribe linux-m68k" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
