Bug 783171 – sys-libs/glibc-2.32-r8 - many commands hang for minutes due to new nsswitch.conf options

• Status: RESOLVED INVALID
• Product: Gentoo Linux

[Description Ben Kohler 2021-04-16 16:40:28 UTC]

Created attachment 700155 [details]
strace for su -

With the new options in nsswitch.conf:
group:      files [SUCCESS=merge] systemd
passwd:     files systemd

After a while of uptime, many commands start taking a very long time to respond, it seems to be multiples of 30s.  The problem seems to come and go, but when it happens, all new commands will hang up.  Then they will all start responding again at the same time.

Here is an attached strace log for strace -r -f su -  , up to the point where it hung

[Comment 1 Ben Kohler 2021-04-16 16:48:27 UTC]

# time emerge --info

real	6m0.959s
user	0m0.542s
sys	0m0.091s

[Comment 2 Ben Kohler 2021-04-16 16:50:31 UTC]

Created attachment 700158 [details]
strace for emerge --info

Here is where emerge --info hangs

[Comment 3 Ben Kohler 2021-04-16 16:58:16 UTC]

Created attachment 700161 [details]
full strace for emerge --info

[Comment 4 Ben Kohler 2021-04-16 17:00:19 UTC]

Created attachment 700173 [details]
full strace for previous su -

[Comment 5 Lars Wendler (Polynomial-C) (RETIRED) 2021-04-16 18:59:34 UTC]

Duplicate of bug #773436?

[Comment 6 Ben Kohler 2021-04-16 19:01:45 UTC]

Different but I managed to get to the bottom of this earlier with help of floppym.  libnss_systemd.so existed on this (openrc only) system and was causing the hangs, not sure where it came from.

[Comment 7 Sam James 2021-04-16 19:43:48 UTC]

(Useful in case it somehow happens to others)