** Changed in: linux (Ubuntu)
Assignee: AceLan Kao (acelankao) => AaronMa (mapengyu)
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https://bugs.launchpad.net/bugs/2103680
Title:
System hangs when running the memory stress test
Status in HWE Next:
Opinion
Status in linux package in Ubuntu:
New
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux source package in Noble:
New
Status in linux-oem-6.11 source package in Noble:
Fix Released
Bug description:
[Impact]
While running the memory stress test, the system becomes unresponsive.
[Fix]
The commit in v6.11-rc1 introduce the issue.
4e63aeb5d010 blk-wbt: don't throttle swap writes in direct reclaim
And we are seeking for help from the patch owner and other developers on the
mailing list
https://lkml.org/lkml/2025/3/20/90
Currently, we have to revert this commit, because this issue happens
on many platforms.
[Test]
Run the following command on the machine with kernel version greater or equal
to v6.11
sudo stress-ng --aggressive --verify --timeout 300 --mmapmany 0
It should finish the test in 5mins.
[Where problems could occur]
From the commit message reverts this commit may trigger a hang
"When a process holds a lock to allocate a free page, and enters direct
reclaim because there is no free memory, then it might trigger a hung
due to the wbt throttling that causes other processes to fail to get
the lock."
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