Performing verification for noble.
I set up a Samba active directory reproducer as per the testcase, with two
systems, one a server and one the client.
I enabled -proposed on the client, and installed 6.8.0-90-generic.
$ uname -rv
6.8.0-90-generic #91-Ubuntu SMP PREEMPT_DYNAMIC Tue Nov 18 14:14:30 UTC 2025
The current memory was:
total used free shared buff/cache available
Mem: 3915 496 3274 1 367 3418
Swap: 0 0 0
From there, I opened six terminals and ran:
# fallocate -l 1k d1.data
# fallocate -l 1k d2.data
# fallocate -l 1k d3.data
# fallocate -l 1k d4.data
# fallocate -l 1k d5.data
# fallocate -l 1k d6.data
# while true ; do zstd --force d1.data ; done
# while true ; do zstd --force d2.data ; done
# while true ; do zstd --force d3.data ; done
# while true ; do zstd --force d4.data ; done
# while true ; do zstd --force d5.data ; done
# while true ; do zstd --force d6.data ; done
From there, I left the system for approximately one hour. On 6.8.0-87-geenric
and previous, this was enough to exhaust at least half the memory.
But on 6.8.0-90-generic:
total used free shared buff/cache available
Mem: 3915 526 3172 1 440 3388
Swap: 0 0 0
This is great.
I killed all the processes, and let the kernel reclaim:
total used free shared buff/cache available
Mem: 3915 476 3222 1 440 3438
Swap: 0 0 0
Fantastic.
The memory leak has been fixed, happy to mark this bug as verified.
** Tags removed: verification-needed-noble-linux
** Tags added: verification-done-noble-linux
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https://bugs.launchpad.net/bugs/2131213
Title:
cifs: Fix memory leak of a folio every call to cifs_writepages_begin()
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