Messages in this thread | | | Date | Sat, 23 May 2020 16:04:11 +0200 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH] kobject: Make sure the parent does not get released before its children |
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On Sat, May 23, 2020 at 06:21:01AM -0700, Guenter Roeck wrote: > On Wed, May 13, 2020 at 06:18:40PM +0300, Heikki Krogerus wrote: > > In the function kobject_cleanup(), kobject_del(kobj) is > > called before the kobj->release(). That makes it possible to > > release the parent of the kobject before the kobject itself. > > > > To fix that, adding function __kboject_del() that does > > s/kboject/kobject/ > > > everything that kobject_del() does except release the parent > > reference. kobject_cleanup() then calls __kobject_del() > > instead of kobject_del(), and separately decrements the > > reference count of the parent kobject after kobj->release() > > has been called. > > > > Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> > > Reported-by: kernel test robot <rong.a.chen@intel.com> > > Fixes: 7589238a8cf3 ("Revert "software node: Simplify software_node_release() function"") > > Cc: Brendan Higgins <brendanhiggins@google.com> > > Cc: Randy Dunlap <rdunlap@infradead.org> > > Suggested-by: "Rafael J. Wysocki" <rafael@kernel.org> > > Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> > > Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > Reviewed-by: Brendan Higgins <brendanhiggins@google.com> > > Tested-by: Brendan Higgins <brendanhiggins@google.com> > > Acked-by: Randy Dunlap <rdunlap@infradead.org> > > Tested-by: Randy Dunlap <rdunlap@infradead.org> > > All my arm64be (arm64 big endian) boot tests crash with this patch > applied. Reverting it fixes the problem. Crash log and bisect results > (from pending-fixes branch) below.
Ugh, ok, just when I send Linus a pull request. Let me go fix that...
greg k-h
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