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There is CPU hard Lockup detected under Ubuntu 24.04 LTS (kernel
6.8.0-38). see attachment"dmesg0723-Lockup-Ubuntu24.04.log"
ubuntu@SR950V3:~$ cat /var/log/dmesg | grep -i lockup
[ 15.241164] kernel: watchdog: Watchdog detected hard LOCKUP on cpu
124
[ 15.241164] kernel: ? watchdog_hardlockup_check+0x1cb/0x3b0
Besides, the issue does not occur on upstream kernel 6.8，6.9, 6.10, 6.11-rc*,
then only ubuntu kernel issue. see attachment "dmesg0923-No-Lockup-Kernel
6-10.log".
According to the dmesg log, the "hard lockup" is not a real lockup,
Because many CPU try to get cache_disable_lock spin lock at the same time when
kernel boot. And competition has occurred here.
Every CPU's TLB will be flushed in the critical zone, the flushing TLB is a
time-consuming operation, and there are so many CPUs,
so the false "hard lockup" was detected by kernel. To avoid customer confuse,
when Canonical do the fix?
HW Config:
ThinkSystem SR950 V3
CPU: 8* Intel(R) Xeon(R) Platinum 8490H 60 Core 3.5GHz
MEM: 2TB = SK Hynix 356GB DDR5 4800MHz 3DS (2015.1GB)
Raid: ThinkSystem RAID 940-8i 4GB Flash PCIe Gen4 12Gb Adapter
Storage: Micron_7450_MTFDKBA960TFR *1
Samsung 30.7TB 24Gbps SAS 2.5" SSD
NIC: ThinkSystem Intel X710-T4L 10GBASE-T 4-Port OCP Ethernet Adapter
OS: ubuntu 24.04 LTS( kernel 6.8.0-38-generic)
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
--
[Ubuntu 24.04-generic Kernel-6.8]Hard lockup on 8 Socket System, ThinkSystem
SR950 V3.
https://bugs.launchpad.net/bugs/2081685
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