This bug was fixed in the package linux - 4.15.0-161.169
---------------
linux (4.15.0-161.169) bionic; urgency=medium
* bionic/linux: 4.15.0-161.169 -proposed tracker (LP: #1947358)
* Bionic/linux-aws Boot failure downgrading from Bionic/linux-aws-5.4 on
r5.metal (LP: #1946149)
- SAUCE: Revert "PCI/MSI: Enforce MSI[X] entry updates to be visible"
- SAUCE: Revert "PCI/MSI: Enforce that MSI-X table entry is masked for
update"
linux (4.15.0-160.168) bionic; urgency=medium
* bionic/linux: 4.15.0-160.168 -proposed tracker (LP: #1944933)
* Packaging resync (LP: #1786013)
- debian/dkms-versions -- update from kernel-versions (main/2021.09.27)
* ext4 journal recovery fails w/ data=journal + mmap (LP: #1847340)
- jbd2: introduce/export functions
jbd2_journal_submit|finish_inode_data_buffers()
- jbd2, ext4, ocfs2: introduce/use journal callbacks
j_submit|finish_inode_data_buffers()
- ext4: data=journal: fixes for ext4_page_mkwrite()
- ext4: data=journal: write-protect pages on j_submit_inode_data_buffers()
- ext4: fix mmap write protection for data=journal mode
* CVE-2021-40490
- ext4: fix race writing to an inline_data file while its xattrs are
changing
* Bionic update: upstream stable patchset 2021-09-22 (LP: #1944600)
- iio: humidity: hdc100x: Add margin to the conversion time
- iio: adc: Fix incorrect exit of for-loop
- ASoC: intel: atom: Fix reference to PCM buffer address
- i2c: dev: zero out array used for i2c reads from userspace
- ACPI: NFIT: Fix support for virtual SPA ranges
- ASoC: cs42l42: Correct definition of ADC Volume control
- ASoC: cs42l42: Don't allow SND_SOC_DAIFMT_LEFT_J
- ASoC: cs42l42: Fix inversion of ADC Notch Switch control
- ASoC: cs42l42: Remove duplicate control for WNF filter frequency
- net: dsa: mt7530: add the missing RxUnicast MIB counter
- ppp: Fix generating ifname when empty IFLA_IFNAME is specified
- psample: Add a fwd declaration for skbuff
- net: Fix memory leak in ieee802154_raw_deliver
- net: bridge: fix memleak in br_add_if()
- tcp_bbr: fix u32 wrap bug in round logic if bbr_init() called after 2B
packets
- xen/events: Fix race in set_evtchn_to_irq
- vsock/virtio: avoid potential deadlock when vsock device remove
- powerpc/kprobes: Fix kprobe Oops happens in booke
- x86/tools: Fix objdump version check again
- x86/resctrl: Fix default monitoring groups reporting
- PCI/MSI: Enable and mask MSI-X early
- PCI/MSI: Do not set invalid bits in MSI mask
- PCI/MSI: Correct misleading comments
- PCI/MSI: Use msi_mask_irq() in pci_msi_shutdown()
- PCI/MSI: Protect msi_desc::masked for multi-MSI
- PCI/MSI: Mask all unused MSI-X entries
- PCI/MSI: Enforce that MSI-X table entry is masked for update
- PCI/MSI: Enforce MSI[X] entry updates to be visible
- vmlinux.lds.h: Handle clang's module.{c,d}tor sections
- mac80211: drop data frames without key on encrypted links
- x86/fpu: Make init_fpstate correct with optimized XSAVE
- ath: Use safer key clearing with key cache entries
- ath9k: Clear key cache explicitly on disabling hardware
- ath: Export ath_hw_keysetmac()
- ath: Modify ath_key_delete() to not need full key entry
- ath9k: Postpone key cache entry deletion for TXQ frames reference it
- dmaengine: usb-dmac: Fix PM reference leak in usb_dmac_probe()
- ARM: dts: am43x-epos-evm: Reduce i2c0 bus speed for tps65218
- dmaengine: of-dma: router_xlate to return -EPROBE_DEFER if controller is
not
yet available
- scsi: megaraid_mm: Fix end of loop tests for list_for_each_entry()
- scsi: scsi_dh_rdac: Avoid crash during rdac_bus_attach()
- scsi: core: Avoid printing an error if target_alloc() returns -ENXIO
- ARM: dts: nomadik: Fix up interrupt controller node names
- net: usb: lan78xx: don't modify phy_device state concurrently
- Bluetooth: hidp: use correct wait queue when removing ctrl_wait
- dccp: add do-while-0 stubs for dccp_pr_debug macros
- vhost: Fix the calculation in vhost_overflow()
- bnxt: don't lock the tx queue from napi poll
- net: 6pack: fix slab-out-of-bounds in decode_data
- ptp_pch: Restore dependency on PCI
- net: qlcnic: add missed unlock in qlcnic_83xx_flash_read32
- net: mdio-mux: Don't ignore memory allocation errors
- net: mdio-mux: Handle -EPROBE_DEFER correctly
- mmc: dw_mmc: Fix hang on data CRC error
- ALSA: hda - fix the 'Capture Switch' value change notifications
- ipack: tpci200: fix many double free issues in tpci200_pci_probe
- btrfs: prevent rename2 from exchanging a subvol with a directory from
different parents
- ASoC: intel: atom: Fix breakage for PCM buffer address setup
- locks: print a warning when mount fails due to lack of "mand" support
- fs: warn about impending deprecation of mandatory locks
- netfilter: nft_exthdr: fix endianness of tcp option cast
- KVM: X86: MMU: Use the correct inherited permissions to get shadow page
- ASoC: cs42l42: Fix LRCLK frame start edge
- net: igmp: fix data-race in igmp_ifc_timer_expire()
- net: dsa: lan9303: fix broken backpressure in .port_fdb_dump
- genirq: Provide IRQCHIP_AFFINITY_PRE_STARTUP
- x86/msi: Force affinity setup before startup
- x86/ioapic: Force affinity setup before startup
- genirq/msi: Ensure deactivation on teardown
-- Stefan Bader <stefan.ba...@canonical.com> Fri, 15 Oct 2021 15:16:33
+0200
** Changed in: linux (Ubuntu Bionic)
Status: Fix Committed => Fix Released
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-40490
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https://bugs.launchpad.net/bugs/1946149
Title:
Bionic/linux-aws Boot failure downgrading from Bionic/linux-aws-5.4 on
r5.metal
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Bionic:
Fix Released
Bug description:
[ Impact ]
The bionic 4.15 kernels are failing to boot on r5.metal instances on AWS. The
default kernel is bionic/linux-aws-5.4(5.4.0-1056-aws), when changing to
bionic/linux-aws(4.15.0-1113-aws) or bionic/linux (4.15.0-160.168) the machine
fails to boot the 4.15 kernel.
This problem only appears on metal instances, which uses NVME instead
of XVDA devices.
[ Fix ]
It was discovered that after reverting the following two commits from
upstream stable the 4.15 kernels can be booted again on the affected AWS metal
instance:
PCI/MSI: Enforce that MSI-X table entry is masked for update
PCI/MSI: Enforce MSI[X] entry updates to be visible
[ Test Case ]
Deploy a r5.metal instance on AWS with a bionic image, which should boot
initially with bionic/linux-aws-5.4. Install bionic/linux or bionic/linux-aws
(4.15 based) and reboot the system.
[ Where problems could occur ]
These two commits are part of a larger patchset fixing PCI/MSI issues which
were backported to some upstream stable releases. By reverting only part of the
set we might end up with MSI issues that were not present before the whole set
was applied. Regression potential can be minimized by testing the kernels with
these two reverted patches on all the platforms available.
[ Original Description ]
When creating an r5.metal instance on AWS, the default kernel is
bionic/linux-aws-5.4(5.4.0-1056-aws), when changing to
bionic/linux-aws(4.15.0-1113-aws) the machine fails to boot the 4.15 kernel.
If I remove these patches the instance correctly boots the 4.15 kernel
https://lists.ubuntu.com/archives/kernel-
team/2021-September/123963.html
With that being said, after successfully updating to the 4.15 without
those patches applied, I can then upgrade to a 4.15 kernel with the
above patches included, and the instance will boot properly.
This problem only appears on metal instances, which uses NVME instead
of XVDA devices.
AWS instances also use the 'discard' mount option with ext4, thought
maybe there could be a race condition between ext4 discard and journal
flush. Removed 'discard' from mount options and rebooted 5.4 kernel
prior to 4.15 kernel installation, but still wouldn't boot after
installing the 4.15 kernel.
I have been unable to capture a stack trace using 'aws get-console-
output'. After enabling kdump I was unable to replicate the failure.
So there must be some sort of race with either ext4 and/or nvme.
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