[CentOS-virt] kernel-4.9.37-29.el7 (and el6)
p.gackiewicz at intertele.pl
Wed Jul 19 09:27:14 UTC 2017
On Mon, 17 Jul 2017, Johnny Hughes wrote:
> Are the testing kernels (kernel-4.9.37-29.el7 and kernel-4.9.37-29.el6,
> with the one config file change) working for everyone:
> (turn off: CONFIG_IO_STRICT_DEVMEM)
Maybe it's not the most appropriate thread or time, but I have been
signalling it before:
4.9.* kernels do not work well for me any more (and for other people
neither, as I know). Last stable kernel was 4.9.13-22.
Since 4.9.25-26 I do often get:
on 3 supermicro servers (different generations):
- memory allocation errors on Dom0 and corresponding lost lost page writes
due to buffer I/O error on PV guests
- after such memory allocation error od dom0 I have spotted also:
- NFS client hangups on guests (server not responding, still trying => server OK)
- iptables lockups on PV guest reboot
on 1 supermicro server:
- memory allocation errors on Dom0 and SATA lockups (many, if not SATA channels at
exception Emask 0x0 SAct 0x20 SErr 0x0 action 0x6 frozen
hard resetting link
failed to IDENTIFY (I/O error, err_mask=0x4)
then: blk_update_request: I/O error, dev sd., sector ....
All of these machines have been tested with memtest, no detected memory problems.
No such things occur, when I boot 4.9.13-22
Most of my guests are centos 6 x86_64, bridged.
Do anyone had such problems, dealt with it somehow?
Since spotting these errors I have done many tests, compiled and tested to
point out single code change (kernel version, patch) - no conclusions yet.
But one has changed much between 4.9.13 and 4.9.25: kernel size and
4.9.13 size was 6MB and 4.9.24 is 7.1MB. Many modules have been
compiled into kernel, here is shortened, but significant list:
- iptables (NETFILTER_XTABLES, IP_NF_FILTER, IP_NF_TARGET_REJECT)
- ATA_AHCI (PATA, what a heck?)
Do we really need these compiled into dom0 kernel?
I assume, that the biggest change in size is due to yama and CRYPTO_*, and
it is not going to change.
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