[21.04 FEAT] Add kernel debug infos for decompressor stage to kernel-debug package

Bug #1905020 reported by bugproxy
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Ubuntu on IBM z Systems
Fix Released
Skipper Bug Screeners
linux (Ubuntu)
Fix Released
Seth Forshee

Bug Description

In order to be able to debug kernel crashes during the early decompressing phase, it would be useful to add the vmlinux file from the decompressor stage to the kernel-debug deb package.
The file is located in arch/s390/boot/compressed/vmlinux.
There are plans to make the kernel relocatable and move more things to the decompressor stage, which would be easier to debug in case of a problem if we have this file in the debug info package.

Business Case:
Increase problem determination / serviceability.

CVE References

bugproxy (bugproxy)
tags: added: architecture-s39064 bugnameltc-189267 severity-high targetmilestone-inin2104
Changed in ubuntu:
assignee: nobody → Skipper Bug Screeners (skipper-screen-team)
affects: ubuntu → linux (Ubuntu)
Revision history for this message
Frank Heimes (fheimes) wrote :

Would you please share more information about the patches and (at least the plan) when they will be available upstream?

Changed in linux (Ubuntu):
assignee: Skipper Bug Screeners (skipper-screen-team) → nobody
Changed in ubuntu-z-systems:
assignee: nobody → Skipper Bug Screeners (skipper-screen-team)
importance: Undecided → High
status: New → Incomplete
Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2021-02-19 08:08 EDT-------
There are no patches required upstream - that feature is just about adding arch/s390/boot/compressed/vmlinux to the kernel debug package. So i think only the rules file of that package needs to be modified. Maybe a diff explains it better:

--- ./debian/rules.d/2-binary-arch.mk.ori 2021-02-19 13:09:46.466852048 +0000
+++ ./debian/rules.d/2-binary-arch.mk 2021-02-19 12:54:32.056342686 +0000
@@ -279,6 +279,10 @@
# Debug image is simple
install -m644 -D $(builddir)/build-$*/vmlinux \
+ifeq ($(arch),s390x)
+ install -m644 -D $(builddir)/build-$*/arch/s390/boot/compressed/vmlinux \
+ $(dbgpkgdir)/usr/lib/debug/boot/vmlinux-$(abi_release)-$*.decompressor
$(build_cd) $(kmake) $(build_O) modules_install $(vdso) \
# Add .gnu_debuglink sections only after all/DKMS modules are built.

Frank Heimes (fheimes)
Changed in ubuntu-z-systems:
status: Incomplete → Triaged
Changed in linux (Ubuntu):
assignee: nobody → Canonical Kernel Team (canonical-kernel-team)
Revision history for this message
bugproxy (bugproxy) wrote :

------- Comment From <email address hidden> 2021-02-23 06:23 EDT-------
@Canonical, anything missing here, from your point of view, for integration?

Revision history for this message
Frank Heimes (fheimes) wrote :

An initial look at this tells me that it should be fine.
But I have to hand over to the kernel team for a final decision.

Frank Heimes (fheimes)
information type: Private → Public
Seth Forshee (sforshee)
Changed in linux (Ubuntu):
assignee: Canonical Kernel Team (canonical-kernel-team) → Seth Forshee (sforshee)
importance: Undecided → Medium
status: New → Fix Committed
Frank Heimes (fheimes)
Changed in ubuntu-z-systems:
status: Triaged → Fix Committed
Revision history for this message
Launchpad Janitor (janitor) wrote :
Download full text (37.7 KiB)

This bug was fixed in the package linux - 5.11.0-14.15

linux (5.11.0-14.15) hirsute; urgency=medium

  * hirsute/linux: 5.11.0-14.15 -proposed tracker (LP: #1923103)

  * Packaging resync (LP: #1786013)
    - update dkms package versions

  * Include Infiniband Peer Memory interface (LP: #1923104)
    - SAUCE: RDMA/core: Introduce peer memory interface

  * Hirsute update: v5.11.12 upstream stable release (LP: #1923069)
    - arm64: mm: correct the inside linear map range during hotplug check
    - virtiofs: Fail dax mount if device does not support it
    - ext4: shrink race window in ext4_should_retry_alloc()
    - ext4: fix bh ref count on error paths
    - fs: nfsd: fix kconfig dependency warning for NFSD_V4
    - rpc: fix NULL dereference on kmalloc failure
    - iomap: Fix negative assignment to unsigned sis->pages in
    - ASoC: rt1015: fix i2c communication error
    - ASoC: rt5640: Fix dac- and adc- vol-tlv values being off by a factor of 10
    - ASoC: rt5651: Fix dac- and adc- vol-tlv values being off by a factor of 10
    - ASoC: sgtl5000: set DAP_AVC_CTRL register to correct default value on probe
    - ASoC: es8316: Simplify adc_pga_gain_tlv table
    - ASoC: soc-core: Prevent warning if no DMI table is present
    - ASoC: cs42l42: Fix Bitclock polarity inversion
    - ASoC: cs42l42: Fix channel width support
    - ASoC: cs42l42: Fix mixer volume control
    - ASoC: cs42l42: Always wait at least 3ms after reset
    - NFSD: fix error handling in NFSv4.0 callbacks
    - ASoC: mediatek: mt8192: fix tdm out data is valid on rising edge
    - kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing
    - vhost: Fix vhost_vq_reset()
    - io_uring: fix ->flags races by linked timeouts
    - io_uring: halt SQO submission on ctx exit
    - scsi: st: Fix a use after free in st_open()
    - scsi: qla2xxx: Fix broken #endif placement
    - staging: comedi: cb_pcidas: fix request_irq() warn
    - staging: comedi: cb_pcidas64: fix request_irq() warn
    - ASoC: rt5659: Update MCLK rate in set_sysclk()
    - ASoC: rt711: add snd_soc_component remove callback
    - thermal/core: Add NULL pointer check before using cooling device stats
    - locking/ww_mutex: Simplify use_ww_ctx & ww_ctx handling
    - locking/ww_mutex: Fix acquire/release imbalance in
    - nvmet-tcp: fix kmap leak when data digest in use
    - io_uring: imply MSG_NOSIGNAL for send[msg]()/recv[msg]() calls
    - Revert "PM: ACPI: reboot: Use S5 for reboot"
    - nouveau: Skip unvailable ttm page entries
    - static_call: Align static_call_is_init() patching condition
    - ext4: do not iput inode under running transaction in ext4_rename()
    - io_uring: call req_set_fail_links() on short send[msg]()/recv[msg]() with
    - net: mvpp2: fix interrupt mask/unmask skip condition
    - mptcp: deliver ssk errors to msk
    - mptcp: fix poll after shutdown
    - mptcp: init mptcp request socket earlier
    - mptcp: add a missing retransmission timer scheduling
    - flow_dissector: fix TTL and TOS dissection on IPv4 fragments
    - mptcp: fix DATA_FIN processing f...

Changed in linux (Ubuntu):
status: Fix Committed → Fix Released
Frank Heimes (fheimes)
Changed in ubuntu-z-systems:
status: Fix Committed → Fix Released
Revision history for this message
bugproxy (bugproxy) wrote :

------- Comment From <email address hidden> 2021-04-14 02:14 EDT-------
IBM Bugzilla status->closed, Fix Released with hirsuite

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