On 11/04/16 13:47, Maarten Maathuis wrote: > Anyone have advice where else I can ask? > > On Sat, Oct 29, 2016 at 1:07 PM, Maarten Maathuis <madman2...@gmail.com> > wrote: >> Anyone have suggestions?
Besides serial console, there are also netconsole, earlycon (probably not useful to you), and earlyprintk. You can use the boot option "initcall_debug" to see what drivers are being loaded and possibly which one is causing the system hang. You can use the boot option "ignore_loglevel" to have all kernel messages printed. Who is enabling DEBUG_TEST_DRIVER_REMOVE? Its help text says: This option is expected to find errors and may render your system unusable. You should say N here unless you are explicitly looking to test this functionality. >> On Thu, Oct 27, 2016 at 8:42 PM, Maarten Maathuis <madman2...@gmail.com> >> wrote: >>> Hi, >>> >>> I recently had trouble with loading a 4.9rcX kernel, which was hanging >>> after loading the initial kernel ramdisk. After some painful bisecting >>> I found this: >>> >>> bea5b158ff0da9c7246ff391f754f5f38e34577a is the first bad commit >>> commit bea5b158ff0da9c7246ff391f754f5f38e34577a >>> Author: Rob Herring <r...@kernel.org> >>> Date: Thu Aug 11 10:20:58 2016 -0500 >>> >>> driver core: add test of driver remove calls during probe >>> >>> In recent discussions on ksummit-discuss[1], it was suggested to do a >>> sequence of probe, remove, probe for testing driver remove paths. This >>> adds a kconfig option for said test. >>> >>> [1] >>> https://lists.linuxfoundation.org/pipermail/ksummit-discuss/2016-August/003459.html >>> >>> Suggested-by: Arnd Bergmann <a...@arndb.de> >>> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> >>> Signed-off-by: Rob Herring <r...@kernel.org> >>> Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> >>> >>> It turns out that the package i was using to build the kernel had >>> DEBUG_TEST_DRIVER_REMOVE enabled. >>> >>> How do I actually figure out why this test causes a hang. I don't have >>> a COM port available to use as serial console, and i don't know if it >>> would even help. >>> >>> Please CC me as i'm not a member of this mailinglist. >>> >>> Maarten. -- ~Randy