Release Notes

SUSE Linux Enterprise Server 12 Service Pack 3
system soft lockup during I/O
Description: In Dell EMC 14
th
generation PowerEdge servers with AMD EPYC processors, if all NUMA nodes are not populated
with memory, system soft lockup occurs during high intensity I/O operations on drives such as NVMe.
Applies to: SUSE Linux Enterprise Server 12 SP3 on R7425, R7415, and R6415
Solution: Update the kernel to version 4.4.82-6.3.1.x86_64 or later.
SUSE Linux Enterprise Server 12 Service Pack 3 tcsd
service fails to start in Xen r kernel
Description: In Dell EMC PowerEdge servers the tcsd service fails to start. The tpm device node is not created when booted to
SLES 12 SP3 Xen Tboot kernel and when Intel TXT is enabled on TPM 1.2 chip.
Cause: The 0xfed40000 (size 0x5000) address is not reserved by BIOS in E820 which is required by the TPM driver.
Solution: For 14
th
generation of Dell EMC PowerEdge servers, update the BIOS to the latest available version.
NOTE: For 13G and earlier generation servers, the issue in the BIOS is not yet xed. You can do one of
the following as a workaround:
• Boot with Kernel boot parameter "memmap=0x5000\$0xfed40000"
• Edit the grub (/etc/default/grub) by running the following commands. After editing the grub, recreate
grub.cfg by running the command grub2mkconfig -o /boot/grub2/grub.cfg.
GRUB_CMDLINE_LINUX_DEFAULT=" memmap=0x5000\\\$0xfed40000 "
GRUB_CMDLINE_LINUX_XEN_REPLACE_DEFAULT=" memmap=0x5000\\\$0xfed40000 "
Issues and Resolutions 13