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    SubjectRe: Kernel NFS lockd freezes notebook on shutdown (Linux 2.6.22-rc1 + CFS v12)
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    Date
    Hello Oleg,

    On Thu, 2007-05-17 at 22:45 +0400, Oleg Nesterov wrote:
    > Hello Zilvinas,
    >
    > On 05/17, Zilvinas Valinskas wrote:
    > >
    > > Patch seems to help and it seems kernel doesn't free anymore. I've
    > > booted new kernel and did :
    >
    > OK, thank you very much. So, we have some other problems, and I _think_
    > that workqueue.c is not the source of them.

    You are welcome. I wish I could determine and fix the problem myself. I
    will try to help, debug the problem as long as there is any progress or
    ideas to try out.

    > However, I can't understand why cleanup_workqueue_thread() hangs anyway.
    > It shouldn't. Looks like rpciod/1 was preempted, and can't get CPU. According
    > to kernel-nfs-freeze.log it is TASK_RUNNING. Strange.
    >
    > It is very sad, because this code was supposed to be cleanuped anyway,
    > but if it is really buggy, it would be great to know why.

    Can this be related to :

    CONFIG_PREEMPT=y
    # CONFIG_PREEMPT_BKL is not set


    > Perhaps, we can understand the problem with your help. Could you please
    > revert the patch I sent, and send me (privately) the output of
    >
    > objdump -d kernel/workqueue.o


    I have uploaded files at http://barclay.balt.net/~zilvinas/oops/

    workqueue.objdump - without any patch.
    workqueue+oleg-old.objdump - with older patch Oleg sent on Thu, 17 May.
    workqueue+oleg-new.objdump - with the newest patch from Oleg applied.

    For what it's worth, I am using Debian/Unstable
    $ gcc -v
    Using built-in specs.
    Target: x86_64-linux-gnu
    Configured with: ../src/configure -v --enable-languages=c,c
    ++,fortran,objc,obj-c++,treelang --prefix=/usr --enable-shared
    --with-system-zlib --libexecdir=/usr/lib --without-included-gettext
    --enable-threads=posix --enable-nls
    --with-gxx-include-dir=/usr/include/c++/4.1.3 --program-suffix=-4.1
    --enable-__cxa_atexit --enable-clocale=gnu --enable-libstdcxx-debug
    --enable-mpfr --enable-checking=release x86_64-linux-gnu
    Thread model: posix
    gcc version 4.1.3 20070514 (prerelease) (Debian 4.1.2-7)

    $ ld -V
    GNU ld (GNU Binutils for Debian) 2.17.50.20070426
    Supported emulations:
    elf_x86_64
    elf_i386
    i386linux

    > ? I doubt very much I'll see something interesting, but who knows...
    >
    > Thanks!
    >
    > Oleg.
    >

    -
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