Re: Occasional hung with UM after enable VMAP_STACK
From: Walter Lozano
Date: Tue Jan 04 2022 - 14:27:08 EST
Hi Johannes,
On 1/4/22 16:04, Johannes Berg wrote:
On Tue, 2022-01-04 at 15:10 -0300, Walter Lozano wrote:
Hi all,
I noticed that after "um: enable VMAP_STACK" [1] I experienced some
occasional hung in my Gitlab CI jobs that use user-mode-linux to build
distro images.
Did you actually *enable* VMAP_STACK in the config as well? The commit
just makes it *possible* to enable it, you still have to set it
yourself. So you should be able to easily check with/without that
setting.
Thank you for your quick response. The Debian configuration on package
user-mode-linux have these settings
CONFIG_HAVE_ARCH_VMAP_STACK=y
CONFIG_VMAP_STACK=y
as you can see in [1]. I did run some tests disabling those settings,
which passed without any hung.
Unfortunately the "occasional" behavior makes this issue a bit tricky to
debug.
Regards,
Walter
[1]
https://salsa.debian.org/uml-team/user-mode-linux/-/blob/master/config.amd64#L321
--
Walter Lozano
Collabora Ltd.