Public bug reported:
Jan 1 09:39:34 XXX.domain.tld kernel: ------------[ cut here
]------------ Jan 1 09:39:34 XXX.domain.tld kernel: kernel BUG at
fs/dcache.c:920! Jan 1 09:39:34 XXX.domain.tld kernel: invalid opcode:
0000 [#1] PREEMPT SMP NOPTI Jan 1 09:39:34 XXX.domain.tld kernel: CPU:
103 PID: 1327569 Comm: worker_thread Tainted: G W
6.8.0-90-generic #91~22.04.1-Ubuntu Jan 1 09:39:34 XXX.domain.tld
kernel: Hardware name: Supermicro SYS-120H-TNR/X12DHM-6, BIOS 2.4
09/06/2025 Jan 1 09:39:34 XXX.domain.tld kernel: RIP:
0010:dget_parent+0xb8/0xc0 Jan 1 09:39:34 XXX.domain.tld kernel: Code:
89 44 24 64 e8 f9 ec d1 00 4c 89 e0 5b 41 5c 41 5d 41 5e 5d 31 ff c3 cc
cc cc cc 4c 89 ef e8 df ec d1 00 e8 7a 78 cc ff eb a5 <0f> 0b 66 0f 1f
44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 Jan 1 09:39:34
XXX.domain.tld kernel: RSP: 0018:ff5bae76562eb8d8 EFLAGS: 00010246 --
Boot 4056bcd8c09a4979b2920da4c567266a --
Random freeze of server every few days, only hard reboot helps.
Problem starts after we do:
A) bios to latest (2.1 -> 2.4)
B) change kernel 5.15 to HWE 6.8
CPU:
2x Intel(R) Xeon(R) Gold 5320 CPU - microcode: 0xd000410
Memory:
2TB (32x M393A8G40AB2-CWE 64GB) - memtest negative
I believe, it looks like bug/incompatibility in kernel 6.8 with this setup.
After we switch back to 5.15 problem not appeared again.
Supermicro suggested to fill kernel report.
ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: linux-image-5.15.0-164-generic 5.15.0-164.174
ProcVersionSignature: Ubuntu 5.15.0-164.174-generic 5.15.193
Uname: Linux 5.15.0-164-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jan 18 02:46 seq
crw-rw---- 1 root audio 116, 33 Jan 18 02:46 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.11-0ubuntu82.10
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:
CRDA: N/A
CasperMD5CheckResult: unknown
Date: Sun Jan 18 10:11:23 2026
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: Supermicro SYS-120H-TNR
PciMultimedia:
ProcFB: 0 astdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-164-generic
root=/dev/mapper/vg0-root ro intel_idle.max_cstate=1 ipv6.disable=1
fsck.mode=skip
RelatedPackageVersions:
linux-restricted-modules-5.15.0-164-generic N/A
linux-backports-modules-5.15.0-164-generic N/A
linux-firmware 20220329.git681281e4-0ubuntu3.40
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/06/2025
dmi.bios.release: 5.22
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: 2.4
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: X12DHM-6
dmi.board.vendor: Supermicro
dmi.board.version: 1.02A
dmi.chassis.asset.tag: Chassis Asset Tag
dmi.chassis.type: 17
dmi.chassis.vendor: Supermicro
dmi.chassis.version: 0123456789
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvr2.4:bd09/06/2025:br5.22:svnSupermicro:pnSYS-120H-TNR:pvr0123456789:rvnSupermicro:rnX12DHM-6:rvr1.02A:cvnSupermicro:ct17:cvr0123456789:skuTobefilledbyO.E.M.:
dmi.product.family: Family
dmi.product.name: SYS-120H-TNR
dmi.product.sku: To be filled by O.E.M.
dmi.product.version: 0123456789
dmi.sys.vendor: Supermicro
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug jammy third-party-packages uec-images
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https://bugs.launchpad.net/bugs/2138568
Title:
kernel BUG at fs/dcache.c:920
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