Ubuntu
linux package

Ubuntu 18.04 kernel crashed while in degraded mode

Bug #1770849 reported by bugproxy on 2018-05-12

This bug affects 1 person

	Status	Importance	Assigned to
The Ubuntu-power-systems project	Fix Released	Critical	Canonical Kernel Team
linux (Ubuntu)	Fix Released	Critical	Ubuntu on IBM Power Systems Bug Triage
Bionic	Fix Released	Critical	Joseph Salisbury

Bug Description

== SRU Justification ==
IBM reports a kernel crash with Bionic while in degraded mode(Degraded
cores).

IBM created a patch to resolve this bug and has submitted it upstream:
https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-May/172835.html

The patch has not landed in mainline as of yet, so it is being submitted
as a SAUCE patch.

== Fix ==
UBUNTU: SAUCE: powerpc/perf: Fix memory allocation for core-imc based on num_possible_cpus()

== Regression Potential ==
Low. Limited to powerpc.

== 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.

kernel crash

The system is going down NOW!
Sent SIGTERM to all processes
Sent SIGKILL to all processes
[ 64.713154] kexec_core: Starting new kernel
[ 156.281504630,5] OPAL: Switch to big-endian OS
[ 158.440263459,5] OPAL: Switch to little-endian OS
[ 1.889211] Unable to handle kernel paging request for data at address 0x678e549df9e2878c
[ 1.889289] Faulting instruction address: 0xc00000000038aa30
[ 1.889344] Oops: Kernel access of bad area, sig: 11 [#1]
[ 1.889386] LE SMP NR_CPUS=2048 NUMA PowerNV
[ 1.889432] Modules linked in:
[ 1.889468] CPU: 3 PID: 1 Comm: swapper/0 Not tainted 4.15.0-20-generic #21-Ubuntu
[ 1.889545] NIP: c00000000038aa30 LR: c00000000038aa1c CTR: 0000000000000000
[ 1.889608] REGS: c000003fed193840 TRAP: 0380 Not tainted (4.15.0-20-generic)
[ 1.889670] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: 28000884 XER: 20040000
[ 1.889742] CFAR: c000000000016e1c SOFTE: 1
[ 1.889742] GPR00: c00000000038a914 c000003fed193ac0 c0000000016eae00 0000000000000001
[ 1.889742] GPR04: c000003fd754c7f8 000000000000002c 0000000000000001 000000000000002b
[ 1.889742] GPR08: 678e549df9e28874 0000000000000000 0000000000000000 fffffffffffffffe
[ 1.889742] GPR12: 0000000028000888 c00000000fa82100 c00000000000d3b8 0000000000000000
[ 1.889742] GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[ 1.889742] GPR20: 0000000000000000 0000000000000000 0000000000000000 a78e54a22eb64f8c
[ 1.889742] GPR24: c000003fd754c800 678e549df9e2878c 0000000000000300 c0000000002bd05c
[ 1.889742] GPR28: c000003fed01ea00 00000000014080c0 c000003fd754c800 c000003fed01ea00
[ 1.890286] NIP [c00000000038aa30] kmem_cache_alloc_trace+0x2d0/0x330
[ 1.890340] LR [c00000000038aa1c] kmem_cache_alloc_trace+0x2bc/0x330
[ 1.890391] Call Trace:
[ 1.890416] [c000003fed193ac0] [c00000000038a914] kmem_cache_alloc_trace+0x1b4/0x330 (unreliable)
[ 1.890491] [c000003fed193b30] [c0000000002bd05c] pmu_dev_alloc+0x3c/0x170
[ 1.890547] [c000003fed193bb0] [c0000000010e3210] perf_event_sysfs_init+0x8c/0xf0
[ 1.890611] [c000003fed193c40] [c00000000000d144] do_one_initcall+0x64/0x1d0
[ 1.890676] [c000003fed193d00] [c0000000010b4400] kernel_init_freeable+0x280/0x374
[ 1.890740] [c000003fed193dc0] [c00000000000d3d4] kernel_init+0x24/0x160
[ 1.890795] [c000003fed193e30] [c00000000000b528] ret_from_kernel_thread+0x5c/0xb4
[ 1.890857] Instruction dump:
[ 1.890909] 7c97ba78 fb210038 38a50001 7f19ba78 fb290000 f8aa0000 4bc8c3f1 60000000
[ 1.890978] 7fb8b840 419e0028 e93f0022 e91f0140 <7d59482a> 7d394a14 7d4a4278 7fa95040
[ 1.891050] ---[ end trace 41b3fe7a827f3888 ]---
[ 2.900027]
[ 3.900175] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[ 3.900175]
[ 4.71868[ 175.340944355,5] OPAL: Reboot request...
2] Rebooting in 10 seconds..

This fix is needed to resolve the crash

https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-May/172835.html

See original description

Tags:

CVE References

bugproxy (bugproxy) on 2018-05-12

tags:	added: architecture-ppc64le bugnameltc-167482 severity-critical targetmilestone-inin1804
Changed in ubuntu:
assignee:	nobody → Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage)
affects:	ubuntu → linux (Ubuntu)

Frank Heimes (fheimes) on 2018-05-14

Changed in ubuntu-power-systems:
status:	New → Triaged
importance:	Undecided → Critical
assignee:	nobody → Canonical Kernel Team (canonical-kernel-team)

Frank Heimes (fheimes) on 2018-05-14

tags:

added: triage-g

Revision history for this message

bugproxy (bugproxy) wrote on 2018-05-14: Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2018-05-14 13:11 EDT-------
Tested this issue by applying the above patch on top of current bionic source, and it worked fine.

Frank Heimes (fheimes) on 2018-05-14

tags:

added: kernel-da-key

Joseph Salisbury (jsalisbury) on 2018-05-14

Changed in linux (Ubuntu):
importance:	Undecided → Critical
status:	New → Triaged
Changed in linux (Ubuntu Bionic):
status:	New → Triaged
importance:	Undecided → Critical
assignee:	nobody → Joseph Salisbury (jsalisbury)
status:	Triaged → In Progress
Changed in linux (Ubuntu):
status:	Triaged → In Progress

Revision history for this message

Joseph Salisbury (jsalisbury) wrote on 2018-05-14:

I built a test kernel with the requested patch. The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1770849

Can you test this kernel and see if it resolves this bug?

Note about installing test kernels:
• If the test kernel is prior to 4.15(Bionic) you need to install the linux-image and linux-image-extra .deb packages.
• If the test kernel is 4.15(Bionic) or newer, you need to install the linux-image-unsigned, linux-modules and linux-modules-extra .deb packages.

Thanks in advance!

Frank Heimes (fheimes) on 2018-05-14

Changed in ubuntu-power-systems:
status:	Triaged → In Progress

Revision history for this message

bugproxy (bugproxy) wrote on 2018-05-15:

------- Comment From <email address hidden> 2018-05-15 02:41 EDT-------
Tested the above kernel and it worked fine with degraded cores. Not seen any kernel crashes. Thanks.

Revision history for this message

Joseph Salisbury (jsalisbury) wrote on 2018-05-18:

SRU request submitted:
https://lists.ubuntu.com/archives/kernel-team/2018-May/092543.html

description:

updated

Colin Ian King (colin-king) on 2018-05-18

description:

updated

Stefan Bader (smb) on 2018-05-23

Changed in linux (Ubuntu Bionic):
status:	In Progress → Fix Committed

Frank Heimes (fheimes) on 2018-05-23

Changed in ubuntu-power-systems:
status:	In Progress → Fix Committed

Revision history for this message

Brad Figg (brad-figg) wrote on 2018-05-24:

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 'verification-needed-bionic' to 'verification-failed-bionic'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

tags:

added: verification-needed-bionic

Revision history for this message

bugproxy (bugproxy) wrote on 2018-05-25:

------- Comment From <email address hidden> 2018-05-25 02:02 EDT-------
Tested the proposed kernel, and not seen the issue, tests ran fine.

linux-generic/bionic-proposed 4.15.0.23.24 ppc64el [upgradable from: 4.15.0.20.23]
linux-headers-generic/bionic-proposed 4.15.0.23.24 ppc64el [upgradable from: 4.15.0.20.23]
linux-image-generic/bionic-proposed 4.15.0.23.24 ppc64el [upgradable from: 4.15.0.20.23]

uname -a
Linux ltc-boston125 4.15.0-23-generic #25-Ubuntu SMP Wed May 23 17:59:00 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux

tags:

added: verification-done-bionic
removed: verification-needed-bionic

Frank Heimes (fheimes) on 2018-05-28

Changed in linux (Ubuntu):
status:	In Progress → Fix Committed

Revision history for this message

Launchpad Janitor (janitor) wrote on 2018-06-11:

Download full text (11.4 KiB)

This bug was fixed in the package linux - 4.15.0-23.25

---------------
linux (4.15.0-23.25) bionic; urgency=medium

* linux: 4.15.0-23.25 -proposed tracker (LP: #1772927)

  * arm64 SDEI support needs trampoline code for KPTI (LP: #1768630)
    - arm64: mmu: add the entry trampolines start/end section markers into
      sections.h
    - arm64: sdei: Add trampoline code for remapping the kernel

  * Some PCIe errors not surfaced through rasdaemon (LP: #1769730)
    - ACPI: APEI: handle PCIe AER errors in separate function
    - ACPI: APEI: call into AER handling regardless of severity

  * qla2xxx: Fix page fault at kmem_cache_alloc_node() (LP: #1770003)
    - scsi: qla2xxx: Fix session cleanup for N2N
    - scsi: qla2xxx: Remove unused argument from qlt_schedule_sess_for_deletion()
    - scsi: qla2xxx: Serialize session deletion by using work_lock
    - scsi: qla2xxx: Serialize session free in qlt_free_session_done
    - scsi: qla2xxx: Don't call dma_free_coherent with IRQ disabled.
    - scsi: qla2xxx: Fix warning in qla2x00_async_iocb_timeout()
    - scsi: qla2xxx: Prevent relogin trigger from sending too many commands
    - scsi: qla2xxx: Fix double free bug after firmware timeout
    - scsi: qla2xxx: Fixup locking for session deletion

  * Several hisi_sas bug fixes (LP: #1768974)
    - scsi: hisi_sas: dt-bindings: add an property of signal attenuation
    - scsi: hisi_sas: support the property of signal attenuation for v2 hw
    - scsi: hisi_sas: fix the issue of link rate inconsistency
    - scsi: hisi_sas: fix the issue of setting linkrate register
    - scsi: hisi_sas: increase timer expire of internal abort task
    - scsi: hisi_sas: remove unused variable hisi_sas_devices.running_req
    - scsi: hisi_sas: fix return value of hisi_sas_task_prep()
    - scsi: hisi_sas: Code cleanup and minor bug fixes

  * [bionic] machine stuck and bonding not working well when nvmet_rdma module
    is loaded (LP: #1764982)
    - nvmet-rdma: Don't flush system_wq by default during remove_one
    - nvme-rdma: Don't flush delete_wq by default during remove_one

  * Warnings/hang during error handling of SATA disks on SAS controller
    (LP: #1768971)
    - scsi: libsas: defer ata device eh commands to libata

* Hotplugging a SATA disk into a SAS controller may cause crash (LP: #1768948)
- ata: do not schedule hot plug if it is a sas host

  * ISST-LTE:pKVM:Ubuntu1804: rcu_sched self-detected stall on CPU follow by CPU
    ATTEMPT TO RE-ENTER FIRMWARE! (LP: #1767927)
    - powerpc/powernv: Handle unknown OPAL errors in opal_nvram_write()
    - powerpc/64s: return more carefully from sreset NMI
    - powerpc/64s: sreset panic if there is no debugger or crash dump handlers

* fsnotify: Fix fsnotify_mark_connector race (LP: #1765564)
- fsnotify: Fix fsnotify_mark_connector race

* Hang on network interface removal in Xen virtual machine (LP: #1771620)
- xen-netfront: Fix hang on device removal

* HiSilicon HNS NIC names are truncated in /proc/interrupts (LP: #1765977)
- net: hns: Avoid action name truncation

* Ubuntu 18.04 kernel crashed while in degraded mode (LP: #1770849)
- SAUCE: powerpc/perf: Fix memory allocation for...

This bug was fixed in the package linux - 4.15.0-23.25

---------------
linux (4.15.0-23.25) bionic; urgency=medium

* linux: 4.15.0-23.25 -proposed tracker (LP: #1772927)

* Some PCIe errors not surfaced through rasdaemon (LP: #1769730)
    - ACPI: APEI: handle PCIe AER errors in separate function
    - ACPI: APEI: call into AER handling regardless of severity

* Warnings/hang during error handling of SATA disks on SAS controller
    (LP: #1768971)
    - scsi: libsas: defer ata device eh commands to libata

* Hotplugging a SATA disk into a SAS controller may cause crash (LP: #1768948)
    - ata: do not schedule hot plug if it is a sas host

* fsnotify: Fix fsnotify_mark_connector race (LP: #1765564)
    - fsnotify: Fix fsnotify_mark_connector race

* Hang on network interface removal in Xen virtual machine (LP: #1771620)
    - xen-netfront: Fix hang on device removal

* HiSilicon HNS NIC names are truncated in /proc/interrupts (LP: #1765977)
    - net: hns: Avoid action name truncation

* Ubuntu 18.04 kernel crashed while in degraded mode (LP: #1770849)
    - SAUCE: powerpc/perf: Fix memory allocation for core-imc based on
      num_possible_cpus()

* Switch Build-Depends: transfig to fig2dev (LP: #1770770)
    - [Config] update Build-Depends: transfig to fig2dev

* smp_call_function_single/many core hangs with stop4 alone (LP: #1768898)
    - cpufreq: powernv: Fix hardlockup due to synchronous smp_call in timer
      interrupt

* Add d-i support for Huawei NICs (LP: #1767490)
    - d-i: add hinic to nic-modules udeb

* unregister_netdevice: waiting for eth0 to become free. Usage count = 5
    (LP: #1746474)
    - xfrm: reuse uncached_list to track xdsts

* Include nfp driver in linux-modules (LP: #1768526)
    - [Config] Add nfp.ko to generic inclusion list

* Kernel panic on boot (m1.small in cn-north-1) (LP: #1771679)
    - x86/xen: Reset VCPU0 info pointer after shared_info remap

* CVE-2018-3639 (x86)
    - x86/bugs: Fix the parameters alignment and missing void
    - KVM: SVM: Move spec control call after restore of GS
    - x86/speculation: Use synthetic bits for IBRS/IBPB/STIBP
    - x86/cpufeatures: Disentangle MSR_SPEC_CTRL enumeration from IBRS
    - x86/cpufeatures: Disentangle SSBD enumeration
    - x86/cpufeatures: Add FEATURE_ZEN
    - x86/speculation: Handle HT correctly on AMD
    - x86/bugs, KVM: Extend speculation control for VIRT_SPEC_CTRL
    - x86/speculation: Add virtualized speculative store bypass disable support
    - x86/speculation: Rework speculative_store_bypass_update()
    - x86/bugs: Unify x86_spec_ctrl_{set_guest,restore_host}
    - x86/bugs: Expose x86_spec_ctrl_base directly
    - x86/bugs: Remove x86_spec_ctrl_set()
    - x86/bugs: Rework spec_ctrl base and mask logic
    - x86/speculation, KVM: Implement support for VIRT_SPEC_CTRL/LS_CFG
    - KVM: SVM: Implement VIRT_SPEC_CTRL support for SSBD
    - x86/bugs: Rename SSBD_NO to SSB_NO
    - bpf: Prevent memory disambiguation attack
    - KVM: VMX: Expose SSBD properly to guests.

* Suspend to idle: Open lid didn't resume (LP: #1771542)
    - ACPI / PM: Do not reconfigure GPEs for suspend-to-idle

* Fix initialization failure detection in SDEI for device-tree based systems
    (LP: #1768663)
    - firmware: arm_sdei: Fix return value check in sdei_present_dt()

* No driver for Huawei network adapters on arm64 (LP: #1769899)
    - net-next/hinic: add arm64 support

* CVE-2018-1092
    - ext4: fail ext4_iget for root directory if unallocated

* kernel 4.15 breaks nouveau on Lenovo P50 (LP: #1763189)
    - drm/nouveau: Fix deadlock in nv50_mstm_register_connector()

* update-initramfs not adding i915 GuC firmware for Kaby Lake, firmware fails
    to load (LP: #1728238)
    - Revert "UBUNTU: SAUCE: (no-up) i915: Remove MODULE_FIRMWARE statements for
      unreleased firmware"

* Battery drains when laptop is off  (shutdown) (LP: #1745646)
    - PCI / PM: Check device_may_wakeup() in pci_enable_wake()

* Dell Latitude 5490/5590 BIOS update 1.1.9 causes black screen at boot
    (LP: #1764194)
    - drm/i915/bios: filter out invalid DDC pins from VBT child devices

* Intel 9462 A370:42A4 doesn't work (LP: #1748853)
    - iwlwifi: add shared clock PHY config flag for some devices
    - iwlwifi: add a bunch of new 9000 PCI IDs

* Fix an issue that some PCI devices get incorrectly suspended (LP: #1764684)
    - PCI / PM: Always check PME wakeup capability for runtime wakeup support

* [SRU][Bionic/Artful] fix false positives in W+X checking (LP: #1769696)
    - init: fix false positives in W+X checking

* Bionic update to v4.15.18 stable release (LP: #1769723)
    - netfilter: ipset: Missing nfnl_lock()/nfnl_unlock() is added to
      ip_set_net_exit()
    - cdc_ether: flag the Cinterion AHS8 modem by gemalto as WWAN
    - rds: MP-RDS may use an invalid c_path
    - slip: Check if rstate is initialized before uncompressing
    - vhost: fix vhost_vq_access_ok() log check
    - l2tp: fix races in tunnel creation
    - l2tp: fix race in duplicate tunnel detection
    - ip_gre: clear feature flags when incompatible o_flags are set
    - vhost: Fix vhost_copy_to_user()
    - lan78xx: Correctly indicate invalid OTP
    - media: v4l2-compat-ioctl32: don't oops on overlay
    - media: v4l: vsp1: Fix header display list status check in continuous mode
    - ipmi: Fix some error cleanup issues
    - parisc: Fix out of array access in match_pci_device()
    - parisc: Fix HPMC handler by increasing size to multiple of 16 bytes
    - Drivers: hv: vmbus: do not mark HV_PCIE as perf_device
    - PCI: hv: Serialize the present and eject work items
    - PCI: hv: Fix 2 hang issues in hv_compose_msi_msg()
    - KVM: PPC: Book3S HV: trace_tlbie must not be called in realmode
    - perf/core: Fix use-after-free in uprobe_perf_close()
    - x86/mce/AMD: Get address from already initialized block
    - hwmon: (ina2xx) Fix access to uninitialized mutex
    - ath9k: Protect queue draining by rcu_read_lock()
    - x86/apic: Fix signedness bug in APIC ID validity checks
    - f2fs: fix heap mode to reset it back
    - block: Change a rcu_read_{lock,unlock}_sched() pair into
      rcu_read_{lock,unlock}()
    - nvme: Skip checking heads without namespaces
    - lib: fix stall in __bitmap_parselist()
    - blk-mq: order getting budget and driver tag
    - blk-mq: don't keep offline CPUs mapped to hctx 0
    - ovl: fix lookup with middle layer opaque dir and absolute path redirects
    - xen: xenbus_dev_frontend: Fix XS_TRANSACTION_END handling
    - hugetlbfs: fix bug in pgoff overflow checking
    - nfsd: fix incorrect umasks
    - scsi: qla2xxx: Fix small memory leak in qla2x00_probe_one on probe failure
    - block/loop: fix deadlock after loop_set_status
    - nfit: fix region registration vs block-data-window ranges
    - s390/qdio: don't retry EQBS after CCQ 96
    - s390/qdio: don't merge ERROR output buffers
    - s390/ipl: ensure loadparm valid flag is set
    - get_user_pages_fast(): return -EFAULT on access_ok failure
    - mm/gup_benchmark: handle gup failures
    - getname_kernel() needs to make sure that ->name != ->iname in long case
    - Bluetooth: Fix connection if directed advertising and privacy is used
    - Bluetooth: hci_bcm: Treat Interrupt ACPI resources as always being active-
      low
    - rtl8187: Fix NULL pointer dereference in priv->conf_mutex
    - ovl: set lower layer st_dev only if setting lower st_ino
    - Linux 4.15.18

* Kernel bug when unplugging Thunderbolt 3 cable, leaves xHCI host controller
    dead (LP: #1768852)
    - xhci: Fix Kernel oops in xhci dbgtty

* Incorrect blacklist of bcm2835_wdt (LP: #1766052)
    - [Packaging] Fix missing watchdog for Raspberry Pi

* CVE-2018-8087
    - mac80211_hwsim: fix possible memory leak in hwsim_new_radio_nl()

* Integrated Webcam Realtek Integrated_Webcam_HD (0bda:58f4) not working in
    DELL XPS 13 9370 with firmware 1.50 (LP: #1763748)
    - SAUCE: media: uvcvideo: Support realtek's UVC 1.5 device

* [ALSA] [PATCH] Clevo P950ER ALC1220 Fixup (LP: #1769721)
    - SAUCE: ALSA: hda/realtek - Clevo P950ER ALC1220 Fixup

* Bionic: Intermittently sent to Emergency Mode on boot with unhandled kernel
    NULL pointer dereference at  0000000000000980 (LP: #1768292)
    - thunderbolt: Prevent crash when ICM firmware is not running

* linux-snapdragon: reduce EPROBEDEFER noise during boot (LP: #1768761)
    - [Config] snapdragon: DRM_I2C_ADV7511=y

* regression Aquantia Corp. AQC107 4.15.0-13-generic -> 4.15.0-20-generic ?
    (LP: #1767088)
    - net: aquantia: Regression on reset with 1.x firmware
    - net: aquantia: oops when shutdown on already stopped device

* e1000e msix interrupts broken in linux-image-4.15.0-15-generic
    (LP: #1764892)
    - e1000e: Remove Other from EIAC

* Acer Swift sf314-52 power button not managed  (LP: #1766054)
    - SAUCE: platform/x86: acer-wmi: add another KEY_POWER keycode

* set PINCFG_HEADSET_MIC to parse_flags for Dell precision 3630 (LP: #1766398)
    - ALSA: hda/realtek - set PINCFG_HEADSET_MIC to parse_flags

* Change the location for one of two front mics on a lenovo thinkcentre
    machine (LP: #1766477)
    - ALSA: hda/realtek - adjust the location of one mic

* SRU: bionic: apply 50 ZFS upstream bugfixes (LP: #1764690)
    - SAUCE: (noup) Update zfs to 0.7.5-1ubuntu15 (LP: #1764690)

* [8086:3e92] display becomes blank after S3 (LP: #1763271)
    - drm/i915/edp: Do not do link training fallback or prune modes on EDP

-- Stefan Bader <stefan.bader@canonical.com>  Wed, 23 May 2018 18:54:55 +0200

Changed in linux (Ubuntu Bionic):
status:	Fix Committed → Fix Released

Frank Heimes (fheimes) on 2018-06-11

Changed in linux (Ubuntu):
status:	Fix Committed → Fix Released
Changed in ubuntu-power-systems:
status:	Fix Committed → Fix Released

Revision history for this message

bugproxy (bugproxy) wrote on 2018-06-20:

------- Comment From <email address hidden> 2018-06-20 17:20 EDT-------
@pridhiviraj Hello Pridhiviraj, can this issue be closed now?

Revision history for this message

bugproxy (bugproxy) wrote on 2018-06-21:

------- Comment From <email address hidden> 2018-06-21 01:37 EDT-------
(In reply to comment #21)
>
> @pridhiviraj Hello Pridhiviraj, can this issue be closed now?

Yes, this is tested with 4.15.0-24-generic kernel. So we can close the issue.

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Ubuntu 18.04 kernel crashed while in degraded mode

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