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    SubjectRe: 2.6.26.6-rt11: BUGs (sleeping function called from invalid context)
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    On Sat, 2008-11-08 at 09:47 +0100, Peter Zijlstra wrote:
    > On Fri, 2008-11-07 at 15:52 -0800, Fernando Lopez-Lezcano wrote:
    > > On Fri, 2008-11-07 at 22:47 +0100, Peter Zijlstra wrote:
    > > > On Fri, 2008-11-07 at 13:35 -0800, Fernando Lopez-Lezcano wrote:
    > > > > On Fri, 2008-11-07 at 20:16 +0100, Peter Zijlstra wrote:
    > > > > > On Fri, 2008-11-07 at 14:01 -0500, Steven Rostedt wrote:
    > > > > > > Peter, I think we've seen this before. It is the highmem code sleeping.
    > > > > >
    > > > > > I've been working on an alternative kmap_atomic implementation for -rt,
    > > > > > the below has been build and booted but not stressed, anybody care to
    > > > > > give it a spin ?
    > > > >
    > > > > I'll give it a try. Anything in particular I should try to do? Or not
    > > > > do? Or watch for?
    > > >
    > > > Lots of I/O should stress the i386 highmem stuff. If all is well it
    > > > works, if not, crashes and splats.
    > >
    > > Crashes and splats on boot... sorry, I don't have a way to capture the
    > > kernel oops (or whatever happens, I can only see the end of the
    > > printout)
    > >
    > > ? speedstep_detect_processor
    > > ? __copy_from_user_ll_noccache_nozero
    > > iov_iter_copy_from_user_atomic
    > > ? generic_file_buffered_write
    > > generic_file_buffered_write
    > > ? avs_has_perm_noaudit
    > > ? __rt_spin_lock
    > > ? selinux_inode_need_killpriv
    > > ? __rt_spin_lock
    > > mnt_drop_write
    > > __generic_file_aio_write_nolock
    > > generic_file_aio_write
    > > do_sync_write
    > > ? __enqueue_entity
    > > ? autoremove_wake_function
    > > ? selinux_file_oermission
    > > ? security_file_permission
    > > ? do_sync_write
    > > vfs_write
    > > sys_write
    > > ? schedule_tail
    > > ? ret_from_fork
    > > ? thread_kernel_helper
    >
    > Oh well, thanks for trying, I guess I need to go run this on real
    > hardware, which means finding where I left this i386 distro on the test
    > boxen :-)

    Let me know if you have something to test (or just maybe a simpler fix
    for the BUGs that I posted at the beginning of the thread?)

    -- Fernando




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