APPLIED: [SRU T/X/A/B][PATCH 0/1] LP: #1777029 - fscache: Fix hanging wait

[Khaled Elmously]

Correction - Applied to T,A,B  (was already in X from the upstream stable updates).


On 2018-06-19 02:03:42 , Khaled Elmously wrote:
> Applied to T,X,A,B
> 
> 
> On 2018-06-15 12:33:28 , Daniel Axtens wrote:
> > == SRU Justification ==
> > 
> > [Impact]
> > Under heavy NFS + FSCache load, a user sometimes observes a hang in
> > __fscache_wait_on_page_write+0x5f/0xa0.
> > 
> > Example traces:
> > [<ffffffffc009f1bf>] __fscache_wait_on_page_write+0x5f/0xa0 [fscache]
> > [<ffffffffc009f6da>] __fscache_uncache_all_inode_pages+0xba/0x120 [fscache]
> > [<ffffffffc0419ece>] nfs_fscache_open_file+0x4e/0xc0 [nfs]
> > 
> > [<ffffffffc034f1bf>] __fscache_wait_on_page_write+0x5f/0xa0 [fscache]
> > [<ffffffffc04104dc>] __nfs_fscache_invalidate_page+0x2c/0x80 [nfs]
> > [<ffffffffc03fb543>] nfs_invalidate_page+0x63/0x90 [nfs]
> > [<ffffffff811925c0>] truncate_inode_page+0x80/0x90
> > 
> > [Fix]
> > Cherry-pick 2c98425720233ae3e135add0c7e869b32913502f from upstream,
> > which is a patch from the FSCache maintainer.
> > 
> > [Testcase]
> > The user has run a NFS stress-test with a similar home-grown patch,
> > and will run a stress test on the proposed kernel.
> > 
> > [Regression Potential]
> > Patch is limited to FSCache, so regression potential is limited.
> > 
> > David Howells (1):
> >   fscache: Fix hanging wait on page discarded by writeback
> > 
> >  fs/fscache/page.c | 13 +++++++++----
> >  1 file changed, 9 insertions(+), 4 deletions(-)
> > 
> > -- 
> > 2.17.1
> > 
> > 
> > -- 
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> > kernel-team at lists.ubuntu.com
> > https://lists.ubuntu.com/mailman/listinfo/kernel-team