2014-10-01 15:34 GMT+04:00 Arthur Marsh <arthur.marsh@internode.on.net>:
I managed to complete a git bisect -- fs/cifs:
git bisect good
69cebd75606f8b9162ad5d0104367370ceabeeba is the first bad commit
commit 69cebd75606f8b9162ad5d0104367370ceabeeba
Author: Pavel Shilovsky <pshilovsky@samba.org>
Date: Tue Jun 24 13:42:03 2014 +0400
CIFS: Fix rsize usage in readpages
If a server changes maximum buffer size for read (rsize) requests
on reconnect we can fail on repeating with a big size buffer on
-EAGAIN error in readpages. Fix this by checking rsize all the
time before repeating requests.
Reviewed-by: Shirish Pargaonkar <spargaonkar@suse.com>
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
:040000 040000 8ed2e10a1581bab7b47a7dab4c5763bfdebe0e69
9eca94b68e9a21e1e5e6712fd37012cfe6e7d6d6 M fs
am64:/usr/src/linux# git bisect log
git bisect start '--' 'fs/cifs'
# good: [19583ca584d6f574384e17fe7613dfaeadcdc4a6] Linux 3.16
git bisect good 19583ca584d6f574384e17fe7613dfaeadcdc4a6
# bad: [7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9] Linux 3.17-rc1
git bisect bad 7d1311b93e58ed55f3a31cc8f94c4b8fe988a2b9
# bad: [0ada36b244e8316bb47b46b84b33c5a507bed7a4] CIFS: Separate page
reading from user read
git bisect bad 0ada36b244e8316bb47b46b84b33c5a507bed7a4
# good: [619aa48edbab47367fa8a65e568f63fd64d6b4af] CIFS: Separate page
sending from writepages
git bisect good 619aa48edbab47367fa8a65e568f63fd64d6b4af
# good: [43de94eadf0ceda54509335343bdc1349a2c5ab3] CIFS: Separate writing
from iovec write
git bisect good 43de94eadf0ceda54509335343bdc1349a2c5ab3
# good: [cb7e9eabb2b584884db0d11ae0376d31ac1cfdc1] CIFS: Use multicredits
for SMB 2.1/3 writes
git bisect good cb7e9eabb2b584884db0d11ae0376d31ac1cfdc1
# bad: [69cebd75606f8b9162ad5d0104367370ceabeeba] CIFS: Fix rsize usage in
readpages
git bisect bad 69cebd75606f8b9162ad5d0104367370ceabeeba
# good: [387eb92ac6892518fb67e423f65fcaca76e256a8] CIFS: Separate page
search from readpages
git bisect good 387eb92ac6892518fb67e423f65fcaca76e256a8
# first bad commit: [69cebd75606f8b9162ad5d0104367370ceabeeba] CIFS: Fix
rsize usage in readpages
It points to a different "first bad commit" and I apologise if this has made
it more difficult to locate the problem.
I am happy to try more tests to help identify the problem.
Thank you for pointing it out!
I've reproduced and created a patch that fixes the problem to me (see
the attachment). Can you test it, please?