Re: Bug#983379: linux uml segfault

[Ritesh Raj Sarraf <rrs@debian.org>]

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HI Anton,

On Wed, 2021-03-03 at 09:30 +0000, Anton Ivanov wrote:
> 
> > 
> > OTOH, I have one more user (other than you) who's not been able to
> > reproduce the issue.
> > 
> > > I will do a dissect the moment I figure out how to reproduce it.
> > > I
> > > will try to do some more experiments on that tomorrow.
> 
> I tried to alter the userspace a bit, but it makes no difference.
> 
> Out of curiosity, what are you running it on?
> 

Bare-metal machines. 3 different machines, all Intel processors.
And it fails on all 3 of them.

On the distribution side, all 3 of them run Debian Unstable, with Linux
5.10.13

> > 
> 
> The code here is:
> 
> static inline u32 printk_caller_id(void)
> {
>         return in_task() ? task_pid_nr(current) :
>                 0x80000000 + raw_smp_processor_id();
> }
> 
> 
> That is something which should not bomb out unless we have memory
> corruption or something along those lines - current being invalid.
> 

Must be something different. Not all machines could have bad memory at
the same time.


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