#regzbot introduced: ac795161c93699d600db16c1a8cc23a65a1eceaf
Dear Linux folks,
Commit ac795161c936 (NFSv4: Handle case where the lookup of a directory
fails) [1], part of Linux since 5.17-rc2, introduced a regression, where
a symbolic link on an NFS mount to a directory on another NFS does not
resolve(?) the first time it is accessed:
```
$ ls -dl /src/mariux/beeroot/build-archives
lrwxrwxrwx 1 root root 39 May 5 2021
/src/mariux/beeroot/build-archives ->
/src/mariux_data/beeroot/build-archives
$ df /src/mariux{,_data}
Filesystem 1K-blocks
Used Available Use% Mounted on
macheteinfach:/amd/macheteinfach/1/src/mariux 17575970816
2930189312 14645781504 17% /src/mariux
macheteinfach:/amd/macheteinfach/1/src/mariux_data 17575970816
2930189312 14645781504 17% /src/mariux_data
$ sudo umount /src/mariux /src/mariux_data
$ echo /src/mariux/beeroot/build-archives/*5.17*
/src/mariux/beeroot/build-archives/*5.17*
$ strace -e openat echo /src/mariux/beeroot/build-archives/*5.17*
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
/src/mariux/beeroot/build-archives/*5.17*
+++ exited with 0 +++
$ echo /src/mariux/beeroot/build-archives/*5.17*
/src/mariux/beeroot/build-archives/linux-5.17_rc1-423.x86_64.beebuild.tar.bz2
/src/mariux/beeroot/build-archives/linux-5.17_rc2-424.x86_64.beebuild.tar.bz2
/src/mariux/beeroot/build-archives/linux-5.17_rc3-426.x86_64.beebuild.tar.bz2
/src/mariux/beeroot/build-archives/mariux64-caret_R-3.0.2-5.17_7-0.x86_64.beebuild.tar.bz2
Using a dot in the path works around the issue:
```
$ sudo umount /src/mariux /src/mariux_data
$ strace -e openat echo /src/mariux/beeroot/build-archives/./*5.17*
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
/src/mariux/beeroot/build-archives/./linux-5.17_rc1-423.x86_64.beebuild.tar.bz2
/src/mariux/beeroot/build-archives/./linux-5.17_rc2-424.x86_64.beebuild.tar.bz2
/src/mariux/beeroot/build-archives/./linux-5.17_rc3-426.x86_64.beebuild.tar.bz2
/src/mariux/beeroot/build-archives/./mariux64-caret_R-3.0.2-5.17_7-0.x86_64.beebuild.tar.bz2
+++ exited with 0 +++
```
Kind regards,
Paul
[1]:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ac795161c93699d600db16c1a8cc23a65a1eceaf