** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
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Title:
arm64: Unfair rwlock can stall the system
To manage notificat
This bug was fixed in the package linux - 4.13.0-36.40
---
linux (4.13.0-36.40) artful; urgency=medium
* linux: 4.13.0-36.40 -proposed tracker (LP: #1750010)
* Rebuild without "CVE-2017-5754 ARM64 KPTI fixes" patch set
linux (4.13.0-35.39) artful; urgency=medium
* linux: 4.13
Artful verification: I was able to successfully run the above stress-ng
commmand w/o any errors on the console.
** Tags removed: verification-needed-artful
** Tags added: verification-done-artful
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This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
artful' to 'verification-done-artful'. If the problem still exists,
change the tag 'verifica
** Changed in: linux (Ubuntu Artful)
Status: Confirmed => Fix Committed
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https://bugs.launchpad.net/bugs/1732238
Title:
arm64: Unfair rwlock can stall the system
To manage notif
** Changed in: linux (Ubuntu)
Status: Confirmed => Fix Committed
--
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1732238
Title:
arm64: Unfair rwlock can stall the system
To manage notification
** Description changed:
[Impact]
There is a long-standing upstream bug with the ARM64 specific implementation
of RW locks. The implementation can starve writers under lock contention
leading to RCU stalls, driver timeouts and general system instability.
[Test Case]
$ stress-ng --kill
Example showing driver timeouts:
ubuntu@boomer:~$ stress-ng --kill 0 -t 300 -v
stress-ng: debug: [3344] 224 processors online, 224 processors configured
stress-ng: info: [3344] dispatching hogs: 224 kill
stress-ng: debug: [3344] /sys/devices/system/cpu/cpu0/cache does not exist
stress-ng: info:
** Description changed:
[Impact]
- There is a long-standing upstream bug with the ARM64 specific implementation
of RW locks. The implementation can starve writers under lock contention
leading to RCU stalls and general system instability.
+ There is a long-standing upstream bug with the ARM64
This has been resolved with the following commits upstream:
commit d133166146333e1f13fc81c0e6c43c8d99290a8a
Author: Will Deacon
locking/qrwlock: Prevent slowpath writers getting held up by
fastpath
commit 087133ac90763cd339b6b67f2998f87dcc136c52
Author: Will Deacon
locking/qrwlock, a
** Also affects: linux (Ubuntu Artful)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: linux (Ubuntu Artful)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => dann frazier (
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