Large .dat files written to Temp directories (Windows)

[Haroon-Khel]

On test-azure-win2012r2-x64-1, test-azure-win2012r2-x64-3 and test-azure-win2019-x64-1 their Temp directories are filled up with large .dat files, whose origin is unknown

test-azure-win2012r2-x64-1

adoptopenjdk@test-2012r2-1 /cygdrive/c/Users/jenkins.test-2012r2-1/AppData/Local/Temp
$ ls -la *.dat
-rwx------+ 1 jenkins None 2147484671 Oct 10  2021 dst12191381147079577745.dat
-rwx------+ 1 jenkins None 2147484671 May  8 03:13 dst8808757851773313999.dat
-rwx------+ 1 jenkins None 2147484671 Oct 10  2021 src10083073893585810729.dat
-rwx------+ 1 jenkins None          0 Jun 19 01:10 src12523888732483928706.dat
-rwx------+ 1 jenkins None          0 Jun 26 01:35 src14450829699699143094.dat
-rwx------+ 1 jenkins None          0 Jul  3 02:00 src16185337324852676813.dat
-rwx------+ 1 jenkins None          0 Jul 10 22:30 src17095945012730825308.dat
-rwx------+ 1 jenkins None 2147484671 May  8 03:13 src17662931351367789633.dat
-rwx------+ 1 jenkins None 2147484671 May  8 04:37 src17862466297894479515.dat
-rwx------+ 1 jenkins None          0 Jul 10 02:01 src17894327494747906074.dat
-rwx------+ 1 jenkins None          0 Jun 26 05:03 src5264114818175128872.dat
-rwx------+ 1 jenkins None          0 Jul 10 04:11 src7319034148243782179.dat

test-azure-win2012r2-x64-3

AdoptopenJDK@test-2012r2-3 /cygdrive/c/Users/jenkins/AppData/Local/Temp
$ ls -la *.dat
-rwx------+ 1 jenkins None 2147484671 Jul  3 18:26 dst10525283875402494967.dat
-rwx------+ 1 jenkins None 2147484671 Jan  9  2022 dst1090982662380210025.dat
-rwx------+ 1 jenkins None 2147484671 Jan  9  2022 dst14090557438999081470.dat
-rwx------+ 1 jenkins None 2147484671 Oct 17  2021 dst15451742831967023501.dat
-rwx------+ 1 jenkins None 2147484671 May  8 02:44 dst16767680786618213670.dat
-rwx------+ 1 jenkins None 2147484671 Jul  3 00:59 dst5560256765629115735.dat
-rwx------+ 1 jenkins None 2147484671 Jul  4 00:14 src11220301557628620189.dat
-rwx------+ 1 jenkins None 2147484671 Jul  3 18:26 src12371769305297563754.dat
-rwx------+ 1 jenkins None 2147484671 Jul  3 00:59 src1798870126431615614.dat
-rwx------+ 1 jenkins None 2147484671 Jul 10 21:06 src5646674978054390026.dat

test-azure-win2019-x64-1

adoptopenjdk@test-win2019-1 /cygdrive/c/Users/jenkins/AppData/Local/Temp
$ ls -la *.dat
-rwx------+ 1 jenkins None 5368709122 Feb 7 01:57 LargeGatheringWrite3322105129955012357.dat
-rwx------+ 1 jenkins None 5368709122 Feb 20 08:19 LargeGatheringWrite9933378702831300867.dat
-rwx------+ 1 jenkins None 2147484671 Mar 14 09:43 dst12651648640093188310.dat
-rwx------+ 1 jenkins None 2147484671 Feb 6 10:31 dst183570549372488362.dat
-rwx------+ 1 jenkins None 2147484671 Jun 19 21:07 dst4338419869657228497.dat
-rwx------+ 1 jenkins None 2147484671 Feb 20 08:22 dst5702335999286369047.dat
-rwx------+ 1 jenkins None 2147484671 Jun 19 05:08 dst7728209470019621345.dat
-rwx------+ 1 jenkins None 2147484671 Feb 7 02:00 dst9261951980099793202.dat
-rwx------+ 1 jenkins None 2147484671 Jun 19 21:06 src14810603928291401966.dat
-rwx------+ 1 jenkins None 2147484671 Jun 19 05:06 src2088681814118365386.dat

Thie files are 2G each, often causing disk space issues on our machines. I dont think these files are important since theyre created in the Temp directory. Would be good to find their cause

ref #2493 (comment)

[zdtsw]

can open these .dat files and see what's inside ? maybe can find out which program generated these files on windows?

[Haroon-Khel]

Nothing seems to open it. cating it on the command line reveals what looks like a binary file

[sxa]

TL;DR - They will be safe to delete.

They'll be from one of the tests in the extended.openjdk suite. See #2448 for comparison where an AIX machine's /tmp needed to be expanded. The file name format looks similar so it's likely the same test that's causing it here, and for whatever reason (aborts maybe?) it occasionally hasn't cleared up after itself on those windows machines.