Re: [PATCH] x86/entry/64: Fix native_load_gs_index() SWAPGS handling with IRQ state tracing enabled

[Jarkko Nikula]

On 11/29/2017 11:28 AM, Thomas Gleixner wrote:
> On Wed, 29 Nov 2017, Jarkko Nikula wrote:
>
> > On 11/29/2017 09:09 AM, Ingo Molnar wrote:
> > > Hm, that commit looks broken with irq-tracing enabled. Does the
> > > patch below fix it?
> > No, it makes the machine not to boot at all :-(
> >
> > Log below when I used my config (now attached). With x86_64_defconfig it
> > booted twice but didn't survive suspend/resume. However several other boot
> > attempts with x86_64_defconfig failed somewhat similarly. Not in the same
> > place but hanging anyway. With my own config it seems to always end up failing
> > in trace_hardirqs_off_caller.
>
> Does it work when you disable all the tracing muck?
My config seems to work with Ingo's patch if I disable both 
CONFIG_FTRACE and CONFIG_PROVE_LOCKING which disables the 
CONFIG_TRACE_IRQS_FLAGS.

x86_64_defconfig with CONFIG_FTRACE disabled is still unstable. 
Sometimes hangs during bootup and sometimes boots up to userspace.

--
Jarkko