On 12/26/19 11:15 AM, Nikolaos Milas wrote:
Hello,
MERRY CHRISTMAS to all in list!
After I upgraded to latest: CentOS Linux release 7.7.1908 (Core) I am facing nfs crashes which cause the system to hang frequently.
This is caused by cp to nfs-mounted shares.
Below is dmesg output; you will see call traces. These cause system to gradually overload:
[root@hesperia1 ~]# top top - 10:09:40 up 10:16, 1 user, load average: 53.66, 54.13, 52.98 Tasks: 475 total, 2 running, 436 sleeping, 0 stopped, 37 zombie %Cpu(s): 0.1 us, 0.6 sy, 0.0 ni, 99.2 id, 0.0 wa, 0.0 hi, 0.0 si, 0.1 st KiB Mem : 3879928 total, 813504 free, 1733216 used, 1333208 buff/cache KiB Swap: 4063228 total, 4062708 free, 520 used. 1797264 avail Mem
and finally hangs showing messages (which I have not recorded precisely) in the CLI login screen like "System out of memory". Then I have to reboot.
I tried to downgrade nfs-utils and rpcbind to earlier versions (in case there is a bug in latest ones), but I couldn't:
[root@hesperia1 ~]# yum downgrade rpcbind-0.2.0-47 nfs-utils-1.3.0-61 Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: ftp.ntua.gr * epel: mirrors.daticum.com * extras: ftp.ntua.gr * updates: ftp.ntua.gr No package rpcbind-0.2.0-47 available. No package nfs-utils-1.3.0-61 available. Error: Nothing to do
...
you don't have to specify versions, just
yum downgrade rpcbind nfs-utils
and then yum will work out the versions by itself, and their dependencies - in this case, it appears that you'll have to downgrade some libraries as well.
HTH, Kay