Hi Trond, On 11/4/2019 9:50 PM, Trond Myklebust wrote: > On Tue, 2019-04-09 at 19:54 +0200, Daniel Mack wrote: >> On 9/4/2019 6:55 PM, Trond Myklebust wrote: >>> On Tue, 2019-04-09 at 18:25 +0200, Daniel Mack wrote: >>>> On 8/4/2019 8:51 PM, Trond Myklebust wrote: >>>>> On Mon, 2019-04-08 at 19:01 +0200, Daniel Mack wrote: >>>>>> Hi, >>>>>> >>>>>> I'm seeing the Oops below when trying to boot 5.1.0-rc4 on an >>>>>> ARM >>>>>> PXA3xx >>>>>> platform. v5.0 did not show this effect with the same >>>>>> cmdline. >>>>>> >>>>> Please do bisect if that is at all practical. I'm having >>>>> trouble >>>>> interpreting this Oops. >>>> >>>> Here you go: >>>> >>>> 009a82f6437490c262584d65a14094a818bcb747 is the first bad commit >>>> commit 009a82f6437490c262584d65a14094a818bcb747 >>>> Author: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx> >>>> Date: Sat Mar 9 12:07:17 2019 -0500 >>>> >>>> SUNRPC: Micro-optimise when the task is known not to be >>>> sleeping >>>> >>>> In cases where we know the task is not sleeping, try to >>>> optimise >>>> away the indirect call to task->tk_action() by replacing it >>>> with >>>> a direct call. >>>> Only change tail calls, to allow gcc to perform tail call >>>> elimination. >>> >>> Ah... It looks like we explicitly turn off tail call optimisation >>> in >>> some ARM configs, so this might be a stack overflow. >>> >>> Does your config file have THUMB2_AVOID_R_ARM_THM_JUMP11 set? >> >> Nope. I don't even have THUMB2_KERNEL. >> >> In the meantime, I tried to trace that with some printks, but the bug >> appears evasive, and the backtrace changes as soon as I modify the >> timing. Hmm. >> >> Happy to test patches if you have any idea. >> > > Could you please try pulling the 'testing' branch from > http://git.linux-nfs.org/?p=trondmy/linux-nfs.git;a=shortlog;h=refs/heads/testing > > i.e. 'git pull git://git.linux-nfs.org/projects/trondmy/linux-nfs.git > testing' > > to see if that suffices to fix the issue you're reporting? Yes, that revert in your branch fixes the problem. All fine again! Thanks, Daniel
