Public bug reported:
Summary
-------
After upgrading from 7.0.0-38 to 7.0.0-42 (resolute-updates, published
2026-10-28), gosu 1.19 (built with Go 1.24.6) never returns. The official
mariadb, postgres and mongo Docker images use gosu to drop privileges in
their entrypoints, so all of those containers hang at "Switching to
dedicated user" indefinitely. 7.0.0-43 from -proposed shows the same
behavior. Booting back to 7.0.0-38 fixes it immediately.
Reproducer
----------
timeout 60 docker run --rm --entrypoint gosu mariadb:10.11 nobody id
7.0.0-38: prints "uid=65534(nobody) gid=65534(nogroup) ..." instantly
7.0.0-42: hangs until the timeout
7.0.0-43: hangs until the timeout
On -42 and -43 this was tested at 10+ minutes of uptime, after the boot-time
load had settled. Stuck gosu processes were still alive after 270+ seconds.
On -42 the host stayed in this state for ~10 hours (database containers
restarted ~180 times each, never starting).
Observations
------------
- strace -f of a stuck gosu process (6 threads):
main thread: sched_yield() = 0, repeated forever
other 5: futex(..., FUTEX_WAIT_PRIVATE, 0, NULL) (never woken)
This looks like Go's all-threads setuid/setgid path
(runtime.doAllThreadsSyscall) waiting forever for threads that are
never woken or signaled.
- gosu 1.13 built with Go 1.16.5 (image mariadb:10.6.4-focal) WORKS on
7.0.0-43. Only the newer Go runtime (1.24.6) is affected.
- Same host, same images; only the kernel changed. The same images work
on other hosts running 7.0.0-38.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: kernel-daily-bug
** Attachment added: "version.log"
https://bugs.launchpad.net/bugs/2172422/+attachment/6013232/+files/version.log
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https://bugs.launchpad.net/bugs/2172422
Title:
Regression 7.0.0-42/-43: Go 1.24 programs livelock in setuid (gosu);
official DB Docker images hang on start
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