** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
** Changed in: linux (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1846486
Title:
revert the revert of ext4: make __ext4_get_inode_loc plug
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Eoan:
Fix Released
Bug description:
== SRU Justification Eoan ==
Now that 5.4 contains a fix to the bootup regression due to the lack
of entropy at bootable we should apply this fix and also revert the
revert of commit "Revert "ext4: make __ext4_get_inode_loc plug"".
== Fix ==
So, to clarify, apply the two upstream 5.4-rc commits:
commit 50ee7529ec4500c88f8664560770a7a1b65db72b
Author: Linus Torvalds <[email protected]>
Date: Sat Sep 28 16:53:52 2019 -0700
random: try to actively add entropy rather than passively wait for
it
commit 02f03c4206c1b2a7451d3b3546f86c9c783eac13
Author: Linus Torvalds <[email protected]>
Date: Sun Sep 29 17:59:23 2019 -0700
Revert "Revert "ext4: make __ext4_get_inode_loc plug""
I've benchmarked the Eoan kernel with these two patches and found theo
following speed improvements on an i7-3770 CPU @ 3.40GHz with 8GB and a
WDC WD10EZEX-21WN4A HDD (7200RPM, 64MB cache).
git grep of the kernel: 0.14%
building fwts: 0.40%
build stress-ng 0.45%
tar up kernel source: 7.6%
boot time of eoan cloud image: 10.5%
So I think the speed improvements justify the SRU.
== Regression potential ==
minor change to ext4, which has been regression tested, so risk here
is small. The entropy change will alter the random number generation,
but I believe this does not change the cryptographical security of the
random numbers being generated, so think this change is not security
risk.
originally the ext4 change caused boot time user space regressions
because of the entropy change of this fix, but the random fix
addresses this, so I believe this risk is now zero.
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