** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-aws (Ubuntu Focal)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1926184
Title:
locking/qrwlock: Fix ordering in queued_write_lock_slowpath()
Status in linux package in Ubuntu:
In Progress
Status in linux-aws package in Ubuntu:
In Progress
Status in linux source package in Bionic:
New
Status in linux-aws source package in Bionic:
New
Status in linux source package in Focal:
New
Status in linux-aws source package in Focal:
New
Status in linux source package in Groovy:
New
Status in linux-aws source package in Groovy:
New
Status in linux source package in Hirsute:
New
Status in linux-aws source package in Hirsute:
New
Bug description:
SRU Justification
[Impact]
Out of order reads can fetch a NULL pointer causing a kernel crash.
Affects kernels from v4.15 to v5.11.
[Fix]
commit 84a24bf8c52e66b7ac89ada5e3cfbe72d65c1896 ("locking/qrwlock: Fix
ordering in queued_write_lock_slowpath()")
[Where problems could occur]
This is quite a subtle bug. It is more prevalent on arm64. Regression
possibility seems quite low. The worst impact could be a minor performance
degradation.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1926184/+subscriptions
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