dbgsym contains no debug symbols

[dann frazier]

[Impact]

linux-image-unsigned-5.4.0-77-generic-dbgsym provides a /usr/lib/debug/boot/vmlinux-5.4.0-1040-kvm, but it does not contain any debug symbols.

Turn on CONFIG_DEBUG_INFO to include those debug symbols.

[Test Case]

Compare:

$ file /usr/lib/debug/boot/vmlinux-*
/usr/lib/debug/boot/vmlinux-5.4.0-1040-kvm: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=514891d64a7d18db4fa58aa5cfea213e0951ca9d, not stripped
/usr/lib/debug/boot/vmlinux-5.4.0-77-generic: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=773d8ee85333fe092635f65d2b6850909085c11d, with debug_info, not stripped

[What Could Go Wrong]

Since linux-kvm is tuned for performance, it's possible there's some
side-effect of producing debug symbols that negatively impacts this. I've not
noticed any issues empirically, but I didn't try to measure it.

This config is already successfully turned on in Hirsute/kvm.

[Terry Rudd (terrykrudd)]

Thanks for bringing this up @dann. This needs to be corrected.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-kvm/4.15.0-1100.102 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!

[dann frazier (dannf)]

= verification =
root@dannf-lp1935855:~# wget https://launchpad.net/ubuntu/+archive/primary/+files/linux-image-4.15.0-1100-kvm-dbgsym_4.15.0-1100.102_amd64.ddeb
--2021-09-21 17:13:41-- https://launchpad.net/ubuntu/+archive/primary/+files/linux-image-4.15.0-1100-kvm-dbgsym_4.15.0-1100.102_amd64.ddeb
Resolving launchpad.net (launchpad.net)... 91.189.89.223, 91.189.89.222, 2001:67c:1560:8003::8004, ...
Connecting to launchpad.net (launchpad.net)|91.189.89.223|:443... connected.
HTTP request sent, awaiting response... 303 See Other
Location: https://launchpadlibrarian.net/559404908/linux-image-4.15.0-1100-kvm-dbgsym_4.15.0-1100.102_amd64.ddeb [following]
--2021-09-21 17:13:41-- https://launchpadlibrarian.net/559404908/linux-image-4.15.0-1100-kvm-dbgsym_4.15.0-1100.102_amd64.ddeb
Resolving launchpadlibrarian.net (launchpadlibrarian.net)... 91.189.89.228, 91.189.89.229, 2001:67c:1560:8003::8008, ...
Connecting to launchpadlibrarian.net (launchpadlibrarian.net)|91.189.89.228|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 131805596 (126M) [application/octet-stream]
Saving to: ‘linux-image-4.15.0-1100-kvm-dbgsym_4.15.0-1100.102_amd64.ddeb’

linux-image-4.15.0- 100%[===================>] 125.70M 30.3MB/s in 7.2s

2021-09-21 17:13:49 (17.5 MB/s) - ‘linux-image-4.15.0-1100-kvm-dbgsym_4.15.0-1100.102_amd64.ddeb’ saved [131805596/131805596]

root@dannf-lp1935855:~# dpkg -i linux-image-4.15.0-1100-kvm-dbgsym_4.15.0-1100.102_amd64.ddeb
Selecting previously unselected package linux-image-4.15.0-1100-kvm-dbgsym.
(Reading database ... 33352 files and directories currently installed.)
Preparing to unpack linux-image-4.15.0-1100-kvm-dbgsym_4.15.0-1100.102_amd64.ddeb ...
Unpacking linux-image-4.15.0-1100-kvm-dbgsym (4.15.0-1100.102) ...
Setting up linux-image-4.15.0-1100-kvm-dbgsym (4.15.0-1100.102) ...
root@dannf-lp1935855:~# apt -f install
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
  libfreetype6
Use 'apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 40 not upgraded.
root@dannf-lp1935855:~# file /usr/lib/debug/boot/vmlinux-4.15.0-1100-kvm
/usr/lib/debug/boot/vmlinux-4.15.0-1100-kvm: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, BuildID[sha1]=2ef10554e712a31bd03eba202c31d1e9fda95eab, with debug_info, not stripped

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux-kvm/5.4.0-1047.49 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-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

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!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-kvm - 5.4.0-1047.49

---------------
linux-kvm (5.4.0-1047.49) focal; urgency=medium

  * focal/linux-kvm: 5.4.0-1047.49 -proposed tracker (LP: #1942545)

  * please drop virtualbox-guest-dkms virtualbox-guest-source (LP: #1933248)
    - [Config] kvm: Disable virtualbox dkms build

  * dbgsym contains no debug symbols (LP: #1935855)
    - [config] kvm: CONFIG_DEBUG_INFO=y

  [ Ubuntu: 5.4.0-85.95 ]

  * focal/linux: 5.4.0-85.95 -proposed tracker (LP: #1942557)
  * please drop virtualbox-guest-dkms virtualbox-guest-source (LP: #1933248)
    - [Config] Disable virtualbox dkms build
  * Packaging resync (LP: #1786013)
    - debian/dkms-versions -- update from kernel-versions (main/2021.09.06)
  * LRMv5: switch primary version handling to kernel-versions data set
    (LP: #1928921)
    - [Packaging] switch to kernel-versions
  * disable “CONFIG_HISI_DMA” config for ubuntu version (LP: #1936771)
    - Disable CONFIG_HISI_DMA
    - [Config] Record hisi_dma no longer built for arm64
  * memory leaking when removing a profile (LP: #1939915)
    - apparmor: Fix memory leak of profile proxy
  * CryptoExpress EP11 cards are going offline (LP: #1939618)
    - s390/zcrypt: Support for CCA protected key block version 2
    - s390: Replace zero-length array with flexible-array member
    - s390/zcrypt: Use scnprintf() for avoiding potential buffer overflow
    - s390/zcrypt: replace snprintf/sprintf with scnprintf
    - s390/ap: Remove ap device suspend and resume callbacks
    - s390/zcrypt: use fallthrough;
    - s390/zcrypt: use kvmalloc instead of kmalloc for 256k alloc
    - s390/ap: remove power management code from ap bus and drivers
    - s390/ap: introduce new ap function ap_get_qdev()
    - s390/zcrypt: use kzalloc
    - s390/zcrypt: fix smatch warnings
    - s390/zcrypt: code beautification and struct field renames
    - s390/zcrypt: split ioctl function into smaller code units
    - s390/ap: rename and clarify ap state machine related stuff
    - s390/zcrypt: provide cex4 cca sysfs attributes for cex3
    - s390/ap: rework crypto config info and default domain code
    - s390/zcrypt: simplify cca_findcard2 loop code
    - s390/zcrypt: remove set_fs() invocation in zcrypt device driver
    - s390/ap: remove unnecessary spin_lock_init()
    - s390/zcrypt: Support for CCA APKA master keys
    - s390/zcrypt: introduce msg tracking in zcrypt functions
    - s390/ap: split ap queue state machine state from device state
    - s390/ap: add error response code field for ap queue devices
    - s390/ap: add card/queue deconfig state
    - s390/sclp: Add support for SCLP AP adapter config/deconfig
    - s390/ap: Support AP card SCLP config and deconfig operations
    - s390/ap/zcrypt: revisit ap and zcrypt error handling
    - s390/zcrypt: move ap_msg param one level up the call chain
    - s390/zcrypt: Introduce Failure Injection feature
    - s390/zcrypt: fix wrong format specifications
    - s390/ap: fix ap devices reference counting
    - s390/zcrypt: return EIO when msg retry limit reached
    - s390/zcrypt: fix zcard and zqueue hot-unplug memleak
    - s390/ap: Fix hanging ioctl caused by wrong msg counter
  * ...

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-kvm - 4.15.0-1100.102

---------------
linux-kvm (4.15.0-1100.102) bionic; urgency=medium

  * bionic/linux-kvm: 4.15.0-1100.102 -proposed tracker (LP: #1942580)

  * Bionic update: upstream stable patchset 2021-08-17 (LP: #1940315)
    - [Config] kvm: updateconfigs for UNIX_SCM

  * dbgsym contains no debug symbols (LP: #1935855)
    - [config] kvm: CONFIG_DEBUG_INFO=y

  [ Ubuntu: 4.15.0-157.164 ]

  * bionic/linux: 4.15.0-157.164 -proposed tracker (LP: #1942588)
  * Packaging resync (LP: #1786013)
    - debian/dkms-versions -- update from kernel-versions (main/2021.09.06)
  * dell300x: rsi wifi and bluetooth crash after suspend and resume
    (LP: #1940488)
    - Revert "rsi: Use resume_noirq for SDIO"
  * LRMv5: switch primary version handling to kernel-versions data set
    (LP: #1928921)
    - [Packaging] switch to kernel-versions
  * kvm_unit_tests: emulator test fails on 4.4 / 4.15 kernel, timeout
    (LP: #1932966)
    - kvm: Add emulation for movups/movupd
  * memory leaking when removing a profile (LP: #1939915)
    - security/apparmor/label.c: Clean code by removing redundant instructions
    - apparmor: Fix memory leak of profile proxy
  * ubunut_kernel_selftests: memory-hotplug: avoid spamming logs with
    dump_page() (LP: #1941829)
    - selftests: memory-hotplug: avoid spamming logs with dump_page(), ratio limit
      hot-remove error test
  * Bionic update: upstream stable patchset 2021-08-27 (LP: #1941916)
    - btrfs: mark compressed range uptodate only if all bio succeed
    - regulator: rt5033: Fix n_voltages settings for BUCK and LDO
    - r8152: Fix potential PM refcount imbalance
    - qed: fix possible unpaired spin_{un}lock_bh in _qed_mcp_cmd_and_union()
    - net: Fix zero-copy head len calculation.
    - Revert "Bluetooth: Shutdown controller after workqueues are flushed or
      cancelled"
    - KVM: do not allow mapping valid but non-reference-counted pages
    - Revert "watchdog: iTCO_wdt: Account for rebooting on second timeout"
    - spi: mediatek: Fix fifo transfer
    - padata: validate cpumask without removed CPU during offline
    - Revert "ACPICA: Fix memory leak caused by _CID repair function"
    - ALSA: seq: Fix racy deletion of subscriber
    - clk: stm32f4: fix post divisor setup for I2S/SAI PLLs
    - omap5-board-common: remove not physically existing vdds_1v8_main fixed-
      regulator
    - scsi: sr: Return correct event when media event code is 3
    - media: videobuf2-core: dequeue if start_streaming fails
    - net: natsemi: Fix missing pci_disable_device() in probe and remove
    - nfp: update ethtool reporting of pauseframe control
    - mips: Fix non-POSIX regexp
    - bnx2x: fix an error code in bnx2x_nic_load()
    - net: pegasus: fix uninit-value in get_interrupt_interval
    - net: fec: fix use-after-free in fec_drv_remove
    - net: vxge: fix use-after-free in vxge_device_unregister
    - Bluetooth: defer cleanup of resources in hci_unregister_dev()
    - USB: usbtmc: Fix RCU stall warning
    - USB: serial: option: add Telit FD980 composition 0x1056
    - USB: serial: ch341: fix character loss at high transfer rates
    - USB: serial: ftdi_sio...