Public bug reported:
I just upgraded an NFS server from 20.04 to 22.04. Because of problems
in my setup, it didn't come up cleanly. As part of recovery I did
"systemctl restart nfs-server." I did this after two reboots. In both
cases shortly thereafter I got one or more backtraces in syslog
Aug 11 09:49:25 eternal.lcsr.rutgers.edu kernel: [ 286.197557] refcount_t:
addition on 0; use-after-free.
...
Aug 11 09:49:25 eternal.lcsr.rutgers.edu kernel: [ 286.197695]
get_nfsdfs_client+0x65/0x80 [nfsd]
I'm not giving the whole thing because it should show in the data sent by
apport.
Also, starting after the first one, I started seeing things
like Aug 11 09:49:26 eternal.lcsr.rutgers.edu rpc.mountd[19922]: v4.0 client
detached: (null) from (null)
Aug 11 09:49:26 eternal.lcsr.rutgers.edu rpc.mountd[19922]: message repeated
1831 times: [ v4.0 client detached: (null) f\
rom (null)]
About 30 min after the first attempted restart, the kernel crashed. I
have no further information, because it hung in the startup process when
trying to get a dump. That means I don't absolutely know that the crash
was due to the restart nfs-server. However our NFS servers have been
quite stable otherwise, under both 20.04 and 22.04, so it seems a good
bet the crash is connected.
At least the use-after-free seems reproducible, since I saw it both
times I tried the same thing after rebooting.
Ubuntu 5.15.0-46.49-generic 5.15.39
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.15.0-46-generic 5.15.0-46.49
ProcVersionSignature: Ubuntu 5.15.0-46.49-generic 5.15.39
Uname: Linux 5.15.0-46-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Aug 11 10:46 seq
crw-rw---- 1 root audio 116, 33 Aug 11 10:46 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu82.1
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: Sat Aug 13 15:04:23 2022
InstallationDate: Installed on 2020-11-12 (639 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: Dell Inc. PowerEdge R730
PciMultimedia:
ProcFB: 0 mgag200drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-46-generic
root=UUID=0075734a-4440-4327-82e0-b0c303f1a1d7 ro crashkernel=512M-:192M
RelatedPackageVersions:
linux-restricted-modules-5.15.0-46-generic N/A
linux-backports-modules-5.15.0-46-generic N/A
linux-firmware 20220329.git681281e4-0ubuntu3.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: Upgraded to jammy on 2022-08-11 (2 days ago)
dmi.bios.date: 11/02/2019
dmi.bios.release: 2.11
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.11.0
dmi.board.name: 0599V5
dmi.board.vendor: Dell Inc.
dmi.board.version: A06
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr2.11.0:bd11/02/2019:br2.11:svnDellInc.:pnPowerEdgeR730:pvr:rvnDellInc.:rn0599V5:rvrA06:cvnDellInc.:ct23:cvr:skuSKU=NotProvided;ModelName=PowerEdgeR730:
dmi.product.name: PowerEdge R730
dmi.product.sku: SKU=NotProvided;ModelName=PowerEdge R730
dmi.sys.vendor: Dell Inc.
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2020-11-12T12:56:54.987058
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug jammy uec-images
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https://bugs.launchpad.net/bugs/1986436
Title:
restarting nfs-server seems to create memory corruption
Status in linux package in Ubuntu:
New
Bug description:
I just upgraded an NFS server from 20.04 to 22.04. Because of problems
in my setup, it didn't come up cleanly. As part of recovery I did
"systemctl restart nfs-server." I did this after two reboots. In both
cases shortly thereafter I got one or more backtraces in syslog
Aug 11 09:49:25 eternal.lcsr.rutgers.edu kernel: [ 286.197557] refcount_t:
addition on 0; use-after-free.
...
Aug 11 09:49:25 eternal.lcsr.rutgers.edu kernel: [ 286.197695]
get_nfsdfs_client+0x65/0x80 [nfsd]
I'm not giving the whole thing because it should show in the data sent by
apport.
Also, starting after the first one, I started seeing things
like Aug 11 09:49:26 eternal.lcsr.rutgers.edu rpc.mountd[19922]: v4.0 client
detached: (null) from (null)
Aug 11 09:49:26 eternal.lcsr.rutgers.edu rpc.mountd[19922]: message repeated
1831 times: [ v4.0 client detached: (null) f\
rom (null)]
About 30 min after the first attempted restart, the kernel crashed. I
have no further information, because it hung in the startup process
when trying to get a dump. That means I don't absolutely know that the
crash was due to the restart nfs-server. However our NFS servers have
been quite stable otherwise, under both 20.04 and 22.04, so it seems a
good bet the crash is connected.
At least the use-after-free seems reproducible, since I saw it both
times I tried the same thing after rebooting.
Ubuntu 5.15.0-46.49-generic 5.15.39
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.15.0-46-generic 5.15.0-46.49
ProcVersionSignature: Ubuntu 5.15.0-46.49-generic 5.15.39
Uname: Linux 5.15.0-46-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Aug 11 10:46 seq
crw-rw---- 1 root audio 116, 33 Aug 11 10:46 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu82.1
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: Sat Aug 13 15:04:23 2022
InstallationDate: Installed on 2020-11-12 (639 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: Dell Inc. PowerEdge R730
PciMultimedia:
ProcFB: 0 mgag200drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.15.0-46-generic
root=UUID=0075734a-4440-4327-82e0-b0c303f1a1d7 ro crashkernel=512M-:192M
RelatedPackageVersions:
linux-restricted-modules-5.15.0-46-generic N/A
linux-backports-modules-5.15.0-46-generic N/A
linux-firmware 20220329.git681281e4-0ubuntu3.3
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: Upgraded to jammy on 2022-08-11 (2 days ago)
dmi.bios.date: 11/02/2019
dmi.bios.release: 2.11
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 2.11.0
dmi.board.name: 0599V5
dmi.board.vendor: Dell Inc.
dmi.board.version: A06
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr2.11.0:bd11/02/2019:br2.11:svnDellInc.:pnPowerEdgeR730:pvr:rvnDellInc.:rn0599V5:rvrA06:cvnDellInc.:ct23:cvr:skuSKU=NotProvided;ModelName=PowerEdgeR730:
dmi.product.name: PowerEdge R730
dmi.product.sku: SKU=NotProvided;ModelName=PowerEdge R730
dmi.sys.vendor: Dell Inc.
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2020-11-12T12:56:54.987058
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