cups segfault when printing or editing printers

[Serge Hallyn]

Editing a printer in localhost:631, cups keeps segfaulting after (possibly related) access denied messages:

[932068.059601] audit: type=1400 audit(1648388571.894:566): apparmor="DENIED" operation="connect" profile="/usr/bin/evince" name="/run/user/1000/at-spi/bus_0" pid=853633 comm="evince" requested_mask="wr" denied_mask="wr" fsuid=1000 ouid=1000
[932069.716730] audit: type=1400 audit(1648388573.550:567): apparmor="DENIED" operation="capable" profile="/usr/sbin/cupsd" pid=853664 comm="cupsd" capability=12 capname="net_admin"
[932069.797610] audit: type=1400 audit(1648388573.630:568): apparmor="DENIED" operation="capable" profile="/usr/sbin/cups-browsed" pid=853668 comm="cups-browsed" capability=23 capname="sys_nice"

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: cups 2.4.1op1-1ubuntu2
ProcVersionSignature: Ubuntu 5.15.0-22.22-generic 5.15.19
Uname: Linux 5.15.0-22-generic x86_64
ApportVersion: 2.20.11-0ubuntu79
Architecture: amd64
CasperMD5CheckResult: pass
CupsErrorLog:
 E [27/Mar/2022:08:39:47 -0500] [Job 13] No suitable destination host found by cups-browsed.
 W [27/Mar/2022:08:39:47 -0500] [Job 13] Backend returned status 6 (retry job later)
CurrentDesktop: qtile
Date: Sun Mar 27 08:43:53 2022
InstallationDate: Installed on 2022-02-25 (29 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
Lpstat: device for HP_OfficeJet_200_Mobile_Series: ipps://HP%20OfficeJet%20200%20Mobile%20Series%20%5BBAD650%5D._ipps._tcp.local/
MachineType: LENOVO 20XXS3JC01
Papersize: letter
PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/HP_OfficeJet_200_Mobile_Series.ppd'] failed with exit code 2: grep: /etc/cups/ppd/HP_OfficeJet_200_Mobile_Series.ppd: Permission denied
ProcEnviron:
 TERM=st-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-22-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
SourcePackage: cups
UpgradeStatus: Upgraded to jammy on 2022-03-16 (10 days ago)
dmi.bios.date: 12/02/2021
dmi.bios.release: 1.51
dmi.bios.vendor: LENOVO
dmi.bios.version: N32ET75W (1.51 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20XXS3JC01
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.32
dmi.modalias: dmi:bvnLENOVO:bvrN32ET75W(1.51):bd12/02/2021:br1.51:efr1.32:svnLENOVO:pn20XXS3JC01:pvrThinkPadX1CarbonGen9:rvnLENOVO:rn20XXS3JC01:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20XX_BU_Think_FM_ThinkPadX1CarbonGen9:
dmi.product.family: ThinkPad X1 Carbon Gen 9
dmi.product.name: 20XXS3JC01
dmi.product.sku: LENOVO_MT_20XX_BU_Think_FM_ThinkPad X1 Carbon Gen 9
dmi.product.version: ThinkPad X1 Carbon Gen 9
dmi.sys.vendor: LENOVO

[Serge Hallyn (serge-hallyn)]

The permission denied errors appear unrelated: after stopping apparmor and restarting cups, I still get:

[932499.635684] cupsd[855122]: segfault at 0 ip 00007f39be2ff98c sp 00007ffc12737718 error 4 in libc.so.6[7f39be176000+195000]
[932499.635695] Code: 1e fa 89 f8 31 d2 62 a1 fd 00 ef c0 09 f0 25 ff 0f 00 00 3d 80 0f 00 00 0f 8f 70 03 00 00 62 e1 fe 28 6f 0f 62 b2 75 20 26 d1 <62> f3 75 22 3f 0e 00 c5 fb 93 c9 ff c1 74 45 f3 0f bc d1 0f b6 04
[932503.181032] landscape-packa[855168]: segfault at 7ff7440e7fc0 ip 00007ff32fbd3b7a sp 00007ffc2e910360 error 4 in apt_pkg.cpython-310-x86_64-linux-gnu.so[7ff32fbcd000+1f000]
[932503.181041] Code: 48 8b 55 20 4c 8b 75 28 49 89 c4 8b 52 08 49 8b 46 50 48 8d 14 52 4c 8d 3c d0 4c 39 f8 0f 84 b0 00 00 00 4c 8b 2d 0e 04 03 00 <41> 8b 17 31 f6 4c 89 ef 48 8d 04 d5 00 00 00 00 48 29 d0 49 8b 56

[Serge Hallyn (serge-hallyn)]

This makes it impossible for me to print from my laptop :(

[Serge Hallyn (serge-hallyn)]

(Forcibly downgrading to the impish packages restored ability to print.)