Public bug reported:
On Ubuntu 20.04 with linux-image-5.4.0-30-generic from the Canonical
Kernel Team's proposed PPA, I ran into the following problem with
using a shiftfs 'shifted' ext4 FS mount inside a LXD container.
On the host, I created a file (in emacs) that was in no way special
(single line text file):
🙂 james@malefic:~/projects/ethq/deb$ stat
ethq-0.6.1~git2020517/debian/ethq.install
File: ethq-0.6.1~git2020517/debian/ethq.install
Size: 15 Blocks: 8 IO Block: 4096 regular file
Device: fd01h/64769d Inode: 7085913 Links: 1
Access: (0664/-rw-rw-r--) Uid: ( 1000/ james) Gid: ( 1000/ james)
Access: 2020-05-17 22:48:36.274528130 +0100
Modify: 2020-05-17 22:37:17.676232019 +0100
Change: 2020-05-17 22:37:17.676232019 +0100
Birth: -
🙂 james@malefic:~/projects/ethq/deb$ stat ethq-0.6.1~git2020517/debian/rules
But in the container, I saw this:
ubuntu@ethq-build:~/ethq/deb/ethq-0.6.1~git2020517$ ls -l debian/
ls: cannot access 'debian/ethq.install': No such file or directory
total 20
-rw-rw-r-- 1 ubuntu ubuntu 150 May 17 21:25 changelog
-rw-r--r-- 1 ubuntu ubuntu 2 May 17 21:36 compat
-rw-rw-r-- 1 ubuntu ubuntu 514 May 17 21:14 control
-rw-rw-r-- 1 ubuntu ubuntu 720 May 17 21:20 copyright
-????????? ? ? ? ? ? ethq.install
-rwxr-xr-x 1 ubuntu ubuntu 30 May 17 21:35 rules
ubuntu@ethq-build:~/ethq/deb/ethq-0.6.1~git2020517$ stat debian/ethq.install
stat: cannot stat 'debian/ethq.install': No such file or directory
ubuntu@ethq-build:~/ethq/deb/ethq-0.6.1~git2020517$
On a suggestion from Stephane Graber, I tried running:
echo 3 > /proc/sys/vm/drop_caches
Which seemed to resolve the problem:
ubuntu@ethq-build:~/ethq/deb/ethq-0.6.1~git2020517$ stat debian/ethq.install
File: 'debian/ethq.install'
Size: 15 Blocks: 8 IO Block: 4096 regular file
Device: fd01h/64769d Inode: 7085913 Links: 1
Access: (0664/-rw-rw-r--) Uid: ( 1000/ ubuntu) Gid: ( 1000/ ubuntu)
Access: 2020-05-17 21:48:36.274528130 +0000
Modify: 2020-05-17 21:37:17.676232019 +0000
Change: 2020-05-17 21:37:17.676232019 +0000
Birth: -
ubuntu@ethq-build:~/ethq/deb/ethq-0.6.1~git2020517$
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1879196
Title:
'shifted' (shiftfs) FS mount became inconsistent with host FS;
resolved by dropping caches
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