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    SubjectRe: [Bisected Regression in 2.6.35] A full tmpfs filesystem causes hibernationto hang
    Date
    > Hello all,
    >
    > I am using Debian Sid on a Toshiba Satellite A100 laptop. After testing
    > 2.6.35 for a while, I noticed that sometimes my hibernation attempts
    > would fail. I should say that I never had such a problem before 2.6.35.
    > The hibernation process hangs with 2.6.35 after printing the following:
    >
    > === 8< ===
    > ...
    > Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
    > PM: Preallocating image memory...
    > === >8 ===
    >
    > After a short investigation, I found out that this only happens when my
    > tmpfs filesystem on /tmp had a lot of data in it. When my tmpfs is empty,
    > I have no problems.
    >
    > So I wrote a short script which fills up the tmpfs on /tmp and tries to
    > hibernate, and I bisected the kernel using this script.
    >
    > The end result is that the following commit causes this regression:
    >
    > === 8< ===
    > commit bb21c7ce18eff8e6e7877ca1d06c6db719376e3c
    > Author: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    > Date: Fri Jun 4 14:15:05 2010 -0700
    >
    > vmscan: fix do_try_to_free_pages() return value when priority==0 reclaim failure
    >
    > ...
    > === >8 ===
    >
    > I have run 2.6.35-rc6, 2.6.35 and 2.6.35.1 with this commit reverted,
    > and I am happy to say that I haven't experienced any problems for at
    > least 17 days.
    >
    > It looks like this change was included with 2.6.35-rc1. I am sorry
    > for not testing earlier.
    >
    > I am willing to do testing in case anyone would like me to try patches.

    Wow.

    I'm very surprised this report because 1) the above commit changed
    do_try_to_free_pages() return value 2) but current hibernation code is
    ignoring this return value. Hmm... I have to investigate this very
    interesting issue.

    Thanks this report, and please give me a bit time.





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