Re: [CRASH] kunit failures in platform-device-devm

[Frederic Weisbecker]

Le Mon, Mar 02, 2026 at 03:32:00PM +0000, Alice Ryhl a écrit :
> On Sun, Mar 01, 2026 at 02:06:49PM +0000, Alice Ryhl wrote:
> > Hi DRIVER CORE, KOBJECTS, DEBUGFS AND SYSFS,
> > 
> > I've experienced a fair number of different crashes when running kunit
> > locally. I just ran this command on v7.0-rc1 or upstream/master:
> > 
> > ./tools/testing/kunit/kunit.py run --make_options LLVM=1 --arch x86_64 --kconfig_add CONFIG_RUST=y --kconfig_add CONFIG_PCI=y
> 
> Bisection has been carried out!
> 
> The culprit is commit 5564c12385b7 ("kthread: Include unbound kthreads
> in the managed affinity list"). Cc'ing everyone from this commit.
> 
> On this commit, kunit (executed using above command) crashes for me 70%
> of the time (14 out of 20 runs) with kernel crashes (Oops) and
> refcount_t use-after-free warnings in pm_runtime_test_cases and
> platform-device-devm. On the parent commit, I was able to run kunit 24
> times in a row with zero kunit failures.
> 
> The same crashes occur on tag v7.0-rc2, so this issue is not fixed.

I can reproduce (though rather 10% of the time). Investigating...

-- 
Frederic Weisbecker
SUSE Labs