** Attachment added: "dm_fake_dev.sh"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829563/+attachment/5716855/+files/dm_fake_dev.sh
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This bug was fixed in the package linux - 5.0.0-25.26
---
linux (5.0.0-25.26) disco; urgency=medium
* CVE-2019-1125
- x86/cpufeatures: Carve out CQM features retrieval
- x86/cpufeatures: Combine word 11 and 12 into a new scattered features word
- x86/speculation: Prepare
This bug was fixed in the package linux - 5.2.0-10.11
---
linux (5.2.0-10.11) eoan; urgency=medium
* eoan/linux: 5.2.0-10.11 -proposed tracker (LP: #1838113)
* Packaging resync (LP: #1786013)
- [Packaging] resync git-ubuntu-log
* Eoan update: v5.2.4 upstream stable release
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-
xenial' to 'verification-done-xenial'. If the problem still exists,
change the tag 'verifica
Verification done for bionic-proposed
based on the 3 tests / comments above.
** Tags removed: verification-needed-bionic
** Tags added: verification-done-bionic
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Verification with bionic-proposed of fio results.
For details see comment #5.
Overall performance has improved on the -proposed kernel
(tested in build without the patchset) and the patchset
as is in the -proposed kernel did improve it a bit more.
The results below show 3 results for each cache-
Verification with bionic-proposed of xfstests results.
No regressions introduced by this bcache patchset.
The comparison between -updates and -proposed is not directly possible
because -proposed introduced failures via other components in I/O path
(e.g., block, ext4).
This is described below, an
Verification done for Disco (one patch change only).
Only one of the two bcache devices stop working upon failures in one backing
device.
(see comment #21 for details).
# uname -rv
5.0.0-22-generic #23-Ubuntu SMP Tue Jul 23 17:23:54 UTC 2019
# ./setup-two-bcache-one-cache.sh >/dev/null 2>&1
[
Verification with bionic-proposed of the I/O Error path.
All good, working as expected (see comments #11 to #16).
# uname -rv
4.15.0-56-generic #62-Ubuntu SMP Wed Jul 24 20:18:55 UTC 2019
test 1
--
# ./setup.sh >/dev/null 2>&1
[ 369.375820] bcache: register_bdev() registered backing devic
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-
bionic' to 'verification-done-bionic'. If the problem still exists,
change the tag 'verifica
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-
disco' to 'verification-done-disco'. If the problem still exists, change
the tag 'verificati
** Changed in: linux (Ubuntu Disco)
Status: In Progress => Fix Committed
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Title:
bcache: risk of data loss on I/O errors in b
** Changed in: linux (Ubuntu Disco)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided => Medium
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** Changed in: linux (Ubuntu Eoan)
Status: In Progress => Fix Committed
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Title:
bcache: risk of data loss on I/O errors in ba
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Committed
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Title:
bcache: risk of data loss on I/O errors in
Cosmic is reaching EOL and will not receive more kernel updates. Marking
the its task as 'Won't Fix'.
** Changed in: linux (Ubuntu Cosmic)
Status: In Progress => Won't Fix
** Changed in: linux (Ubuntu Disco)
Assignee: (unassigned) => Mauricio Faria de Oliveira (mfo)
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** Also affects: linux (Ubuntu Eoan)
Importance: Undecided
Assignee: Mauricio Faria de Oliveira (mfo)
Status: Invalid
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Disco)
Status: New => In Progress
** Changed
I/O Error Test 6 (for the Disco kernel)
commit: 'Revert "bcache: set CACHE_SET_IO_DISABLE in
bch_cached_dev_error()"'
Problem: if one backing device hits I/O errors the cache device
is disabled, but if that cache device is shared by other bcache
devices they stop too (even with n
[D/E][PATCH 0/1] LP#1829563 bcache: pending patch for Disco/Eoan
https://lists.ubuntu.com/archives/kernel-team/2019-July/102006.html
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[C][PATCH 0/2] LP#1829563 bcache: pending patches for Cosmic
https://lists.ubuntu.com/archives/kernel-team/2019-July/102001.html
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Titl
I/O Error Test 6 (for the Cosmic kernel)
commit: 'Revert "bcache: set CACHE_SET_IO_DISABLE in
bch_cached_dev_error()"'
Problem: if one backing device hits I/O errors the cache device
is disabled, but if that cache device is shared by other bcache
devices they stop too (even with
I/O Error Test 7
commit: "bcache: fix ioctl in flash device"
This test needs QEMU+GDB since there's no way to set the variable
from the kernel, because it references incorrect memory/pointer.
In the original kernel, the ioctl() to a flash-only volume
goes from ioctl_dev() down t
[B][PATCH 00/11] LP#1829563 bcache: risk of data loss on I/O errors in backing
or caching devices
https://lists.ubuntu.com/archives/kernel-team/2019-July/101989.html
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** Description changed:
[Impact]
- * The bcache code in Bionic lacks several fixes to handle
-I/O errors in both backing devices and caching devices.
+ * The bcache code in Bionic lacks several fixes to handle
+ I/O errors in both backing devices and caching devices.
- * Partial
I/O Error Test 1
commit "bcache: add CACHE_SET_IO_DISABLE to struct cache_set flags"
Problem: the cacheset is not retired immediately on I/O errors in
cache device if I/O requests keep coming.
Original kernel: bcache device remains on top of caching device,
and 'fio' never finis
I/O Error Test 4
commit "bcache: add io_disable to struct cached_dev"
Problem: in case of the backing device hits I/o errors or is
disconected, the I/O can still be accepted to the bcache device.
Original kernel: dd writes in writeback mode to failed backing device complete.
Mod
I/O Error Test 2
commit "bcache: add stop_when_cache_set_failed option to backing device"
Problem: upon too many io errors on cache device, bcache code retires cache set,
but it doesn't stop the bcache device.
(in writeback mode, if it continue to write, writes go to backing dev
I/O Error Test 5
commit "bcache: stop bcache device when backing device is offline"
Problem: bcache is unaware that a backing device goes offline,
and accepts writes.
Original kernel: bcache doesn't realize backing device is offline.
Modified kernel: bcache device is removed aft
I/O Error Test 6
Make sure that if two bcache devices share a cache device,
only one bcache device is offlined in case of I/O errors
in only one backing device.
Original
# uname -rv
4.15.0-55-generic #60-Ubuntu SMP Tue Jul 2 18:22:20 UTC 2019
# ./setup-two-bcache-one-
I/O Error Test 3
commit "bcache: fix inaccurate io state for detached bcache devices"
Probçem: on detached bcache devices, iostat reports non-zero 'avgqu-sz'
and '%util' even after IO stopped.
Original kernel: iostat fields are non-zero on I/O idle.
Modified kernel: iostat fiel
** Attachment added: "setup-two-bcache-one-cache.sh"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829563/+attachment/5275535/+files/setup-two-bcache-one-cache.sh
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** Attachment added: "setup.sh"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829563/+attachment/5275533/+files/setup.sh
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** Attachment added: "setup-sda.sh"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829563/+attachment/5275534/+files/setup-sda.sh
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Tests with I/O errors
=
The I/O error tests in the caching and backing device have been
simulated with the device mapper dm-linear and dm-error targets.
The tests are based on the patch messages, which describe a
problem and/or expected behavior, so to exercise the change.
Co
** Attachment added: "test-bcache-cache-modes.fio.sh"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829563/+attachment/5275532/+files/test-bcache-cache-modes.fio.sh
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Tests with fio
==
The fio tool has been run for performance tests on the original
and modified kernels in sequential (rw) and random read/write (randrw)
on all cache modes available (writethrough, writeback, writearound, none).
Summary: no regressions observed, same IOPS and BW metri
** Attachment added: "test-bcache-cache-modes.xfstests.sh"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829563/+attachment/5275531/+files/test-bcache-cache-modes.xfstests.sh
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Tests with xfstests
===
The xfstests test suite has been run on the original
and modified kernels -- on all cache modes available
(writethrough, writeback, writearound, none).
Summary: no regressions observed; apparently one FIX
achieved in the writearound cache mode (generic/371)
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