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** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2007038
Title:
22.04 ib_mthca BUG: kernel NULL pointer, but had worked in 20.04
Status in linux package in Ubuntu:
Confirmed
Bug description:
I run some x86_64 machines with Infiniband interfaces (Mellanox
MT25204, ib_mthca driver + ib_ipoib for IP-over-IB).
This had worked fine for years under Ubuntu 20.04.1 LTS and under
RHEL6 before it.
But as soon as I updated to 22.04.1 LTS -- with both its default
5.15.0-60-generic kernel and also 6.1.0-1006-oem (the latest packaged
one I could find), the IB interface doesn't work.
dmesg shows some UBSAN shift-out-of-bounds warnings in mthca modules,
e.g. "shift exponent -25557 is negative". That's a bizarre number -
maybe a hint of something uninitialized?
The crippling symptom shows up within a second after that: a NULL
dereference within the ib_mthca driver -- the "BUG: kernel NULL
pointer dereference", in mthca_poll_one. The interface never sets its
RUNNING flag (as shown by ifconfig).
The rest of the system remains usable after the "BUG" message -- the
ethernet, disk, etc. drivers and other functions work as expected.
Attempting to unload the ib_mthca driver causes a kernel panic.
Is there anything I should try? Should I build a kernel from source
with debugging? I could try installing the 5.4.0 kernel from 20.04,
but would rather use something that will continue to get security
patches.
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.15.0-60-generic 5.15.0-60.66
ProcVersionSignature: Ubuntu 5.15.0-60.66-generic 5.15.78
Uname: Linux 5.15.0-60-generic x86_64
AlsaDevices:
total 0
crw-rw----+ 1 root audio 116, 1 Feb 12 14:12 seq
crw-rw----+ 1 root audio 116, 33 Feb 12 14:12 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu82.3
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CasperMD5CheckResult: pass
Date: Sun Feb 12 14:17:28 2023
InstallationDate: Installed on 2020-11-22 (812 days ago)
InstallationMedia: Ubuntu-Server 20.04.1 LTS "Focal Fossa" - Release amd64
(20200731)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: Supermicro X7DBR-8
PciMultimedia:
ProcEnviron:
TERM=linux
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 VESA VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-60-generic
root=UUID=8624cf02-e743-4da6-9209-14ef2c2abd10 ro
RelatedPackageVersions:
linux-restricted-modules-5.15.0-60-generic N/A
linux-backports-modules-5.15.0-60-generic N/A
linux-firmware 20220329.git681281e4-0ubuntu3.9
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: Upgraded to jammy on 2023-02-10 (2 days ago)
dmi.bios.date: 12/03/2007
dmi.bios.vendor: Phoenix Technologies LTD
dmi.bios.version: 6.00
dmi.board.name: X7DBR-8
dmi.board.vendor: Supermicro
dmi.board.version: PCB Version
dmi.chassis.type: 1
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 0123456789
dmi.modalias:
dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd12/03/2007:svnSupermicro:pnX7DBR-8:pvr0123456789:rvnSupermicro:rnX7DBR-8:rvrPCBVersion:cvnSupermicro:ct1:cvr0123456789:sku:
dmi.product.name: X7DBR-8
dmi.product.version: 0123456789
dmi.sys.vendor: Supermicro
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