The good news (?) is that this seems easy to reproduce; editing any file in emacs seems to do the trick:
https://pastebin.ubuntu.com/p/XydrSqfkfX/ -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1879196 Title: 'shifted' (shiftfs) FS mount became inconsistent with host FS; resolved by dropping caches Status in linux package in Ubuntu: Incomplete Bug description: 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$ To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1879196/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
