On Thu, Oct 13, 2022 at 11:03:34AM +1100, Michael Ellerman wrote: > Guenter Roeck <li...@roeck-us.net> writes: > > On Wed, Oct 12, 2022 at 11:20:38AM -0600, Jason A. Donenfeld wrote: > >> > >> I've also managed to not hit this bug a few times. When it triggers, > >> after "kprobes: kprobe jump-optimization is enabled. All kprobes are > >> optimized if possible.", there's a long hang - tens seconds before it > >> continues. When it doesn't trigger, there's no hang at that point in the > >> boot process. > >> > > > > I managed to bisect the problem. See below for results. Reverting the > > offending patch fixes the problem for me. > > Thanks. > > This is probably down to me/us not testing with PREEMPT enabled enough. > Not sure. My configuration has
CONFIG_PREEMPT_NONE=y # CONFIG_PREEMPT_VOLUNTARY is not set # CONFIG_PREEMPT is not set Guenter > cheers > > > --- > > # bad: [1440f576022887004f719883acb094e7e0dd4944] Merge tag > > 'mm-hotfixes-stable-2022-10-11' of > > git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm > > # good: [4fe89d07dcc2804c8b562f6c7896a45643d34b2f] Linux 6.0 > > git bisect start 'HEAD' 'v6.0' > > # good: [7171a8da00035e7913c3013ca5fb5beb5b8b22f0] Merge tag 'arm-dt-6.1' > > of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc > > git bisect good 7171a8da00035e7913c3013ca5fb5beb5b8b22f0 > > # good: [f01603979a4afaad7504a728918b678d572cda9e] Merge tag > > 'gpio-updates-for-v6.1-rc1' of > > git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux > > git bisect good f01603979a4afaad7504a728918b678d572cda9e > > # bad: [8aeab132e05fefc3a1a5277878629586bd7a3547] Merge tag 'for_linus' of > > git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost > > git bisect bad 8aeab132e05fefc3a1a5277878629586bd7a3547 > > # bad: [493ffd6605b2d3d4dc7008ab927dba319f36671f] Merge tag > > 'ucount-rlimits-cleanups-for-v5.19' of > > git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace > > git bisect bad 493ffd6605b2d3d4dc7008ab927dba319f36671f > > # good: [0e470763d84dcad27284067647dfb4b1a94dfce0] Merge tag > > 'efi-next-for-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi > > git bisect good 0e470763d84dcad27284067647dfb4b1a94dfce0 > > # bad: [110a58b9f91c66f743c01a2c217243d94c899c23] powerpc/boot: Explicitly > > disable usage of SPE instructions > > git bisect bad 110a58b9f91c66f743c01a2c217243d94c899c23 > > # good: [fdfdcfd504933ed06eb6b4c9df21eede0e213c3e] powerpc/build: put > > sys_call_table in .data.rel.ro if RELOCATABLE > > git bisect good fdfdcfd504933ed06eb6b4c9df21eede0e213c3e > > # good: [c2e7a19827eec443a7cbe85e8d959052412d6dc3] powerpc: Use generic > > fallocate compatibility syscall > > git bisect good c2e7a19827eec443a7cbe85e8d959052412d6dc3 > > # good: [56adbb7a8b6cc7fc9b940829c38494e53c9e57d1] powerpc/64/interrupt: > > Fix false warning in context tracking due to idle state > > git bisect good 56adbb7a8b6cc7fc9b940829c38494e53c9e57d1 > > # bad: [754f611774e4b9357a944f5b703dd291c85161cf] powerpc/64: switch asm > > helpers from GOT to TOC relative addressing > > git bisect bad 754f611774e4b9357a944f5b703dd291c85161cf > > # bad: [f7bff6e7759b1abb59334f6448f9ef3172c4c04a] powerpc/64/interrupt: > > avoid BUG/WARN recursion in interrupt entry > > git bisect bad f7bff6e7759b1abb59334f6448f9ef3172c4c04a > > # bad: [e485f6c751e0a969327336c635ca602feea117f0] powerpc/64/interrupt: Fix > > return to masked context after hard-mask irq becomes pending > > git bisect bad e485f6c751e0a969327336c635ca602feea117f0 > > # good: [799f7063c7645f9a751d17f5dfd73b952f962cd2] powerpc/64: mark irqs > > hard disabled in boot paca > > git bisect good 799f7063c7645f9a751d17f5dfd73b952f962cd2 > > # first bad commit: [e485f6c751e0a969327336c635ca602feea117f0] > > powerpc/64/interrupt: Fix return to masked context after hard-mask irq > > becomes pending