This bug was fixed in the package linux - 4.15.0-29.31
---------------
linux (4.15.0-29.31) bionic; urgency=medium
* linux: 4.15.0-29.31 -proposed tracker (LP: #1782173)
* [SRU Bionic][Cosmic] kernel panic in ipmi_ssif at msg_done_handler
(LP: #1777716)
- ipmi_ssif: Fix kernel panic at msg_done_handler
* Update to ocxl driver for 18.04.1 (LP: #1775786)
- misc: ocxl: use put_device() instead of device_unregister()
- powerpc: Add TIDR CPU feature for POWER9
- powerpc: Use TIDR CPU feature to control TIDR allocation
- powerpc: use task_pid_nr() for TID allocation
- ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action
- ocxl: Expose the thread_id needed for wait on POWER9
- ocxl: Add an IOCTL so userspace knows what OCXL features are available
- ocxl: Document new OCXL IOCTLs
- ocxl: Fix missing unlock on error in afu_ioctl_enable_p9_wait()
* Critical upstream bugfix missing in Ubuntu 18.04 - frequent Xorg crash after
suspend (LP: #1776887)
- ocxl: Document the OCXL_IOCTL_GET_METADATA IOCTL
* Hard LOCKUP observed on stressing Ubuntu 18 04 (LP: #1777194)
- powerpc: use NMI IPI for smp_send_stop
- powerpc: Fix smp_send_stop NMI IPI handling
* IPL: ppc64_cpu --frequency hang with INFO: rcu_sched detected stalls on
CPUs/tasks on w34 and wsbmc016 with 920.1714.20170330n (LP: #1773964)
- rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops
* [Regression] EXT4-fs error (device sda2): ext4_validate_block_bitmap:383:
comm stress-ng: bg 4705: bad block bitmap checksum (LP: #1781709)
- SAUCE: Revert "UBUNTU: SAUCE: ext4: fix ext4_validate_inode_bitmap: comm
stress-ng: Corrupt inode bitmap"
- SAUCE: ext4: check for allocation block validity with block group locked
linux (4.15.0-28.30) bionic; urgency=medium
* linux: 4.15.0-28.30 -proposed tracker (LP: #1781433)
* Cannot set MTU higher than 1500 in Xen instance (LP: #1781413)
- xen-netfront: Fix mismatched rtnl_unlock
- xen-netfront: Update features after registering netdev
linux (4.15.0-27.29) bionic; urgency=medium
* linux: 4.15.0-27.29 -proposed tracker (LP: #1781062)
* [Regression] EXT4-fs error (device sda1): ext4_validate_inode_bitmap:99:
comm stress-ng: Corrupt inode bitmap (LP: #1780137)
- SAUCE: ext4: fix ext4_validate_inode_bitmap: comm stress-ng: Corrupt inode
bitmap
linux (4.15.0-26.28) bionic; urgency=medium
* linux: 4.15.0-26.28 -proposed tracker (LP: #1780112)
* failure to boot with linux-image-4.15.0-24-generic (LP: #1779827) // Cloud-
init causes potentially huge boot delays with 4.15 kernels (LP: #1780062)
- random: Make getrandom() ready earlier
linux (4.15.0-25.27) bionic; urgency=medium
* linux: 4.15.0-25.27 -proposed tracker (LP: #1779354)
* hisi_sas_v3_hw: internal task abort: timeout and not done. (LP: #1777736)
- scsi: hisi_sas: Update a couple of register settings for v3 hw
* hisi_sas: Add missing PHY spinlock init (LP: #1777734)
- scsi: hisi_sas: Add missing PHY spinlock init
* hisi_sas: improve read performance by pre-allocating slot DMA buffers
(LP: #1777727)
- scsi: hisi_sas: use dma_zalloc_coherent()
- scsi: hisi_sas: Use dmam_alloc_coherent()
- scsi: hisi_sas: Pre-allocate slot DMA buffers
* hisi_sas: Failures during host reset (LP: #1777696)
- scsi: hisi_sas: Only process broadcast change in phy_bcast_v3_hw()
- scsi: hisi_sas: Fix the conflict between dev gone and host reset
- scsi: hisi_sas: Adjust task reject period during host reset
- scsi: hisi_sas: Add a flag to filter PHY events during reset
- scsi: hisi_sas: Release all remaining resources in clear nexus ha
* Fake SAS addresses for SATA disks on HiSilicon D05 are non-unique
(LP: #1776750)
- scsi: hisi_sas: make SAS address of SATA disks unique
* Vcs-Git header on bionic linux source package points to zesty git tree
(LP: #1766055)
- [Packaging]: Update Vcs-Git
* large KVM instances run out of IRQ routes (LP: #1778261)
- SAUCE: kvm -- increase KVM_MAX_IRQ_ROUTES to 2048 on x86
-- Stefan Bader <[email protected]> Tue, 17 Jul 2018 10:57:50
+0200
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1776887
Title:
Critical upstream bugfix missing in Ubuntu 18.04 - frequent Xorg crash
after suspend
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
Fix Released
Bug description:
== SRU Justification ==
This upstream bug has been confirmed to affect Ubuntu users[1]. As
per the fix commit (below), the most frequent symptom is a crash of
Xorg/Xwayland, i.e. killing the entire GUI, when a laptop is woken
from system sleep. Frequency of the bug is described as once every
few days[2].
[1] E.g. this user confirms the bug & very specific workaround:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1760450/comments/11
[2] E.g. this log of crashes:
https://bugzilla.redhat.com/show_bug.cgi?id=1553979#c23
This is a bug in blk-core.c. It is not specific to any one hardware
driver. Technically the suspend bug is triggered by the SCSI core -
which is used by *all SATA devices*.
The commit also includes a test which quickly and reliably proves the
existence of a horrifying bug.
I guess you might avoid this bug only if you have root on NVMe. The
other way to not hit the Xorg crash is if you don't use all your RAM,
so there's no pressure that leads to cold pages of Xorg being swapped.
Also, you won't reproduce the Xorg crash if you suspend+resume
immediately. (This frustrated my tests at one point, it only
triggered after left the system suspended over lunch :).
Fix: "block: do not use interruptible wait anywhere"
in kernel 4.17:
https://github.com/torvalds/linux/commit/1dc3039bc87ae7d19a990c3ee71cfd8a9068f428
in kernel 4.16.8:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-
stable.git/commit/?h=linux-4.16.y&id=7859056bc73dea2c3714b00c83b253d4c22bf7b6
lack of fix in 4.15.0-24.26 (ubuntu 18.04): https://git.launchpad.net
/~ubuntu-kernel/ubuntu/+source/linux/+git/bionic/tree/block/blk-
core.c?id=Ubuntu-4.15.0-24.26#n856
I.e., this bug is still present in Ubuntu source package
linux-4.15.0-24.26 (and 4.15.0-23.25). I attach hardware details
(lspci-vnvn.log) of a system where this bug is known to happen.
Regards
Alan
WORKAROUND: Use kernel parameter:
scsi_mod.scan=sync
== Fix ==
1dc3039bc87a ("block: do not use interruptible wait anywhere")
== Regression Potential ==
Low. This patch has been sent to stable, so it has had additional
upstream review.
== Test Case ==
A test kernel was built with this patch and tested by the original bug
reporter.
The bug reporter states the test kernel resolved the bug.
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https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1776887/+subscriptions
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