Hi Seth, On Thu, Aug 23, 2012 at 10:33:09AM -0500, Seth Jennings wrote: > This patchset fixes a regression in 3.6 by reverting two dependent > commits that made changes to zcache_do_preload(). > > The commits undermine an assumption made by tmem_put() in > the cleancache path that preemption is disabled. This change > introduces a race condition that can result in the wrong page > being returned by tmem_get(), causing assorted errors (segfaults, > apparent file corruption, etc) in userspace. > > The corruption was discussed in this thread: > https://lkml.org/lkml/2012/8/17/494 I think changelog isn't enough to explain what's the race. Could you write it down in detail? And you should Cc'ed Xiao who is author of reverted patch. > > Please apply this patchset to 3.6. This problem didn't exist > in previous releases so nothing need be done for the stable trees. > > Seth Jennings (2): > Revert "staging: zcache: cleanup zcache_do_preload and > zcache_put_page" > Revert "staging: zcache: optimize zcache_do_preload" > > drivers/staging/zcache/zcache-main.c | 54 +++++++++++++++++++--------------- > 1 file changed, 31 insertions(+), 23 deletions(-) > > -- > 1.7.9.5 > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>