Redirecting command output to file results in different row counts each time

[bobf32]

Environment

Windows build number: Win32NT             10.0.19041.0 Microsoft Windows NT 10.0.19041.0
Your Distribution version: (Debian) Release:        10
Whether the issue is on WSL 2 and/or WSL 1:Linux version 4.19.104-microsoft-standard (oe-user@oe-host) (gcc version 8.2.0 (GCC)) #1 SMP Wed Feb 19 06:37:35 UTC 2020

Steps to reproduce

Run the following command multiple times:

/mnt/c/Program\ Files\ (x86)/Calibre2/calibredb.exe --with-library http://localhost:8080/#Calibre_Library list -s "vl:Unread" -f "id" --sort-by id --ascending > /mnt/c/temp/a.out ; wc -l /mnt/c/temp/a.out
-->

Expected behavior

The command should write the output of the calibredb command to the file a.out each time and result in a.out containing 3806 lines on each invocation.

Actual behavior

The number of lines written to a.out varies on each invocation of the command as can be seen in screenshot 1.

Other information

If I pipe the output to the wc command instead of writing to a file the output is 3806 every time, as expected. See screenshot 2.

/mnt/c/Program\ Files\ (x86)/Calibre2/calibredb.exe --with-library http://localhost:8080/#Calibre_Library list -s "vl:Unread" -f "id" --sort-by id --ascending | wc -l

[bobf32]

Update: I have rolled back my WSL instance from WSL2 to WSL1 and can confirm that this problem only manifests in the WSL2 instance.

[therealkenc]

Ref #4082 which has an evens chance of being the same. The one line submitted above is not a repro.

[bobf32]

So I had one day when this worked, but now the original construct is back to producing random truncated output:

/mnt/c/path/to/windows.exe > /mnt/c/temp.a.out

whereas the truncation does not seem to occur with:

/mnt/c/path/to/windows.exe > ~/a.out

[microsoft-github-policy-service]

This issue has been automatically closed since it has not had any activity for the past year. If you're still experiencing this issue please re-file this as a new issue or feature request.

Thank you!