linux-kernel - Re: autofs multi-map regression

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Message-ID: <87fuezr68b.fsf@xmission.com>
Date:   Fri, 16 Jun 2017 16:08:04 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     Dick Streefland <dick@...eefland.net>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: autofs multi-map regression

Dick Streefland <dick@...eefland.net> writes:

> On Friday 2017-06-16 12:03, Eric W. Biederman wrote:
> | Interesting...
> | 
> | Can you test this on a stock 4.11 kernel?
> | 
> | I definitely need a little bit more information to solve this.  That
> | commit did not add any new error condidtions so I need to understand
> | what state you are getting yourself into that is affected by this
> | commit.
> | 
> | Is there a chance you can post /proc/self/mountinfo from when this is
> | happening?
>
> I've installed the mainline 4.11 kernel from:
>
>   http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11/
>
> and this kernel works correctly!
>
> So either this issue was fixed in the meantime, or it is something
> specific to the Ubuntu kernel. I guess I should file a bug report
> with Ubuntu then?

Please.

> I've also looked at /proc/self/mountinfo before and directly after the
> mount attempt. Here are the ext4 and autofs entries for the failing 4.4
> kernel:

Thank you.

I am definitely out of my depth on the autofs portion of this.  As
things are working with 4.11 and failing with my test of 4.4 with
a much older kernel.  I will leave this with you and the ubuntu folks to
sort out.

Good Luck,

Eric


> before:
> 23 0 8:2 / / rw,relatime shared:1 - ext4 /dev/sda2 rw,errors=remount-ro,data=ordered
> 41 19 0:34 / /proc/sys/fs/binfmt_misc rw,relatime shared:24 - autofs systemd-1 rw,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct
> 46 23 8:4 / /loc rw,nosuid,nodev,noatime shared:30 - ext4 /dev/sda4 rw,block_validity,delalloc,barrier,user_xattr,acl
> 202 23 0:44 / /net rw,relatime shared:160 - autofs /etc/auto.net rw,fd=6,pgrp=1724,timeout=120,minproto=5,maxproto=5,indirect
>

> after:
> 23 0 8:2 / / rw,relatime shared:1 - ext4 /dev/sda2 rw,errors=remount-ro,data=ordered
> 41 19 0:34 / /proc/sys/fs/binfmt_misc rw,relatime shared:24 - autofs systemd-1 rw,fd=34,pgrp=1,timeout=0,minproto=5,maxproto=5,direct
> 46 162 8:4 / /loc rw,nosuid,nodev,noatime shared:30 - ext4 /dev/sda4 rw,block_validity,delalloc,barrier,user_xattr,acl
> 202 23 0:44 / /net rw,relatime shared:160 - autofs /etc/auto.net rw,fd=6,pgrp=1724,timeout=120,minproto=5,maxproto=5,indirect
> 157 202 8:2 / /net/localhost rw,relatime shared:1 - ext4 /dev/sda2 rw,errors=remount-ro,data=ordered
> 161 157 0:47 / /net/localhost/loc rw,relatime shared:119 - autofs /etc/auto.net rw,fd=6,pgrp=1724,timeout=120,minproto=5,maxproto=5,offset
> 162 23 0:47 / /loc rw,relatime shared:119 - autofs /etc/auto.net rw,fd=6,pgrp=1724,timeout=120,minproto=5,maxproto=5,offset
>
> And here the info for the working mainline 4.11 kernel:
>
> before:
> 23 0 8:2 / / rw,relatime shared:1 - ext4 /dev/sda2 rw,errors=remount-ro,data=ordered
> 74 19 0:36 / /proc/sys/fs/binfmt_misc rw,relatime shared:56 - autofs systemd-1 rw,fd=35,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=12754
> 45 23 8:4 / /loc rw,nosuid,nodev,noatime shared:28 - ext4 /dev/sda4 rw,block_validity,delalloc,barrier,user_xattr,acl
> 208 23 0:46 / /net rw,relatime shared:164 - autofs /etc/auto.net rw,fd=6,pgrp=1545,timeout=120,minproto=5,maxproto=5,indirect,pipe_ino=26555
>
> after:
> 23 0 8:2 / / rw,relatime shared:1 - ext4 /dev/sda2 rw,errors=remount-ro,data=ordered
> 74 19 0:36 / /proc/sys/fs/binfmt_misc rw,relatime shared:56 - autofs systemd-1 rw,fd=35,pgrp=1,timeout=0,minproto=5,maxproto=5,direct,pipe_ino=12754
> 45 175 8:4 / /loc rw,nosuid,nodev,noatime shared:28 - ext4 /dev/sda4 rw,block_validity,delalloc,barrier,user_xattr,acl
> 208 23 0:46 / /net rw,relatime shared:164 - autofs /etc/auto.net rw,fd=6,pgrp=1545,timeout=120,minproto=5,maxproto=5,indirect,pipe_ino=26555
> 162 208 8:2 / /net/localhost rw,relatime shared:1 - ext4 /dev/sda2 rw,errors=remount-ro,data=ordered
> 166 162 0:48 / /net/localhost/loc rw,relatime shared:122 - autofs /etc/auto.net rw,fd=6,pgrp=1545,timeout=120,minproto=5,maxproto=5,offset,pipe_ino=26555
> 167 23 0:48 / /loc rw,relatime shared:122 - autofs /etc/auto.net rw,fd=6,pgrp=1545,timeout=120,minproto=5,maxproto=5,offset,pipe_ino=26555
> 174 166 8:4 / /net/localhost/loc rw,nosuid,nodev,noatime shared:28 - ext4 /dev/sda4 rw,block_validity,delalloc,barrier,user_xattr,acl
> 175 167 8:4 / /loc rw,nosuid,nodev,noatime shared:28 - ext4 /dev/sda4 rw,block_validity,delalloc,barrier,user_xattr,acl