Re: 64bit startup

[Samuel Thibault]

Samuel Thibault, le mer. 01 nov. 2023 01:50:40 +0100, a ecrit:
> Samuel Thibault, le mar. 31 oct. 2023 04:40:43 +0100, a ecrit:
> > Samuel Thibault, le lun. 30 oct. 2023 18:35:03 +0100, a ecrit:
> > > Samuel Thibault, le dim. 29 oct. 2023 23:27:22 +0100, a ecrit:
> > > > Samuel Thibault, le ven. 27 oct. 2023 08:48:19 +0200, a ecrit:
> > > > > while [  "$(echo -n `echo  internal/reflectlite.s-gox | sed -e 
> > > > > 's/s-gox/gox/' ` )" = internal/reflectlite.gox ] ; do : ; done
> > > > 
> > > > For now, I could reproduce with
> > > > 
> > > > time while [  "$(echo -n `echo a` )" = a ] ; do : ; done
> > > > 
> > > > by running two of them in parallel, along with an apt install loop in
> > > > parallel. It takes a few hours to reproduce (sometimes 1, sometimes
> > > > 3...)
> > > 
> > > It seems to happen more often when running inside a chroot (possibly
> > > because of the intermediate firmlink redirection?), and possibly
> > > eatmydata also makes it more frequent.
> > 
> > (it looks like there are memory leaks in proc, its vminfo keeps
> > increasing).
> 
> It seems 64bit-specific: the program below makes proc leak memory, 100
> vminfo lines at a time. Possibly __mach_msg_destroy doesn't actually
> properly parse messages to be destroyed, so that in the error case the
> server leaks non-inline data? Flavio, perhaps you have an idea?

Realizing only now by reading the __mach_msg_destroy assembly...

    unsigned int        msgt_inline : 1,
                        msgt_longform : 1,
                        msgt_deallocate : 1,
                        msgt_name : 8,
                        msgt_size : 16,
                        msgt_unused : 5;

This field ordering makes reading them overly complex... It'll be a pain
to rebootstrap, but perhaps we do want to put msgt_size and msgt_name
first?

Samuel