/srv/irclogs.ubuntu.com/2021/08/10/#ubuntu-kernel.txt

juerghakselmo, creating the patch from the code snippet in the ticket is the easy part. coming up with a justification why it's needed not so much without knowing anything about it ;-)07:25
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nemoHey folks. I encountered rpeated crash in Ubuntu 20.04 LTS when they reboot one of the remote CIFS mounts that looks a lot like https://www.suse.com/support/kb/doc/?id=00001978013:32
nemohttps://github.com/openSUSE/kernel/commit/a52930353eaf443489a350a135c5525a4acbbf56#diff-365e109294d97a19e9458fa962d35d39ee87651aa464ad34c68606d81783c17013:32
ubottuCommit a529303 in openSUSE/kernel "cifs: handle empty list of targets in cifs_reconnect()"13:32
nemoI was wondering if this never got pushed upstream13:32
nemoCould someone help me locate the branch for 20.04 LTS 5.40.0-80 x86_64 so I could look over that section?13:33
nemofs/cifs/connect.c13:33
nemosymptoms are super annoying at present since mounts just hang and rebooting seems only fix.  13:34
nemo(our current workaround is just to leave the windows mounts active only briefly on Ubuntu 20.04)13:34
mhcerrihi, nemo. you can find the source here: https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/log/?h=Ubuntu-5.4.0-80.9014:01
nemomhcerri: thank you14:03
mhcerrinemo, I think we have this commit in the version in proposed as by https://bugs.launchpad.net/bugs/193583314:03
ubottuLaunchpad bug 1935833 in linux (Ubuntu Focal) "linux-azure CIFS DFS oops" [Medium, Fix Committed]14:03
nemomhcerri: oooh even better14:04
nemogood to have someone experieinced looking at it14:04
nemomhcerri: so it'll be in  backports shortly?14:04
mhcerrilet me check the proposed version to confirm14:04
nemomhcerri: interesting. reported only recently. The opensuse one was fixed last summer14:04
nemoI wonder how often things like this fail to make it back upstream ☹14:05
nemohm.14:07
nemoI wonder how similar the OpenSUSE code is to the ubuntu14:07
nemolet's see ☺14:07
mhcerrinemo, yeah. this commit in included in 5.4.0-81.914:07
mhcerrihttps://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/log/?h=Ubuntu-5.4.0-81.91&qt=grep&q=cifs14:08
nemoman. this was driving us bonkers for like a month14:08
nemomoutn hangs, reboot, mount hangs, reboot14:08
nemofinally made a sudo script to load mounts on demand as needed14:09
nemobut good to know. thanks!14:09
mhcerrinemo, if you want you can try to install the version in focal-proposed to confirm it fixes it. this version is scheduled to be released next week14:09
nemomhcerri: could do that in test perhaps14:10
nemoLoool14:10
nemoSigned-off-by: Paulo Alcantara (SUSE) <pc@cjr.nz>14:10
nemow/ author date of last year14:10
nemook. so just the opensuse one. very very late... and somehow missing the 20.04 release. just an oversight I suppose14:11
nemoso. yay!14:11
nemothanks again.14:11
nemomhcerri: so. sorry. I've never done this before and don't want to screw up the server, even if it is just our "cmtest" server14:15
nemomhcerri: I just do apt -t focal-proposed update linux-kernel ?14:15
nemothen reboot and wait to see if the mount dies again?14:15
nemooh. I guess I probably need to make sure the apt list includes proposed. lessee14:16
mhcerrinemo, you can find the details in this link: https://wiki.ubuntu.com/Testing/EnableProposed14:16
nemothanks14:16
nemohttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/fs/cifs/connect.c  hmmmm checked in last august. what the heck14:19
nemohow did this not make it into ubuntu 20.04!14:19
nemohttps://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/cifs/connect.c?id=a52930353eaf443489a350a135c5525a4acbbf5614:19
ubottuCommit a529303 in kernel/git/torvalds/linux.git "cifs: handle empty list of targets in cifs_reconnect()"14:19
nemooh wait. I'm an idiot. ofc it wouldn't be in 20.04 - last year, the plague year is melding in my mind with this one14:20
nemoit just took a long time to get pulled into backports 😃14:20
mhcerrinemo, that was only included in 5.9 and since it doesn't have a fixes tag or cc:stable in it, it is not easy to "find" such fixes until we have a bug report and we start to investigate it14:21
nemoright14:21
nemomhcerri: naw. it was me mixing up 21.04 and 20.04 ☺14:21
mhcerrihehe14:21
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akselmojuergh: heh true. i'll keep talking with the peeps about this on github and hopefully we get somekind of patch for this one day. thanks for the help everyone!16:15
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