Re: [PATCH for-9.2 00/10] s390: Convert virtio-ccw, cpu to three-phase reset, and followup cleanup

[Peter Maydell]

On Fri, 30 Aug 2024 at 06:48, Nico Boehr <nrb@linux.ibm.com> wrote:
>
> Quoting Peter Maydell (2024-08-29 17:53:02)
> > I repro'd *something*, but it wasn't quite this. I got:
> >
> >
> > [    4.691853] clk: Disabling unused clocks
> > [    4.695419] Freeing unused kernel image (initmem) memory: 6520K
> > [    4.695430] Write protected read-only-after-init data: 144k
> > [    4.695834] Checked W+X mappings: passed, no unexpected W+X pages found
> > [    4.695849] Run /init as init process
> > /init: error while loading shared libraries: libgcc_s.so.1: cannot
> > open shared object file: No such file or directory
> > [    4.697009] Kernel panic - not syncing: Attempted to kill init!
> > exitcode=0x00007f00
> > [    4.697030] CPU: 0 PID: 1 Comm: init Not tainted 6.8.5-301.fc40.s390x #1
> > [    4.697035] Hardware name: IBM 8561 LT1 400 (KVM/Linux)
> > [    4.697040] Call Trace:
> > [    4.697047]  [<000000007ab6ae36>] dump_stack_lvl+0x66/0x88
> > [    4.697081]  [<0000000079e17c2a>] panic+0x312/0x328
> > [    4.697096]  [<0000000079e1de84>] do_exit+0x8a4/0xae8
> > [    4.697101]  [<0000000079e1e2e0>] do_group_exit+0x40/0xb8
> > [    4.697103]  [<0000000079e1e386>] __s390x_sys_exit_group+0x2e/0x30
> > [    4.697105]  [<000000007ab9526a>] __do_syscall+0x252/0x2c0
> > [    4.697113]  [<000000007aba8840>] system_call+0x70/0x98
> >
> > Which I guess could be caused by a different corruption
> > of the initramfs ?
>
> I think that is the problem, just a different symptom. I also got this
> sometimes (in random libraries all over the place).

I ran overnight with none of the patchset applied, and it never
failed (as expected). Running with just the first virtio-ccw
patch does fall over fairly quickly. So something's up with
that patch, which is curious because that's the one I thought
was a straightforward conversion without any complications :-)

I'll investigate further today, I have the beginnings of a
theory about what might be happening...

-- PMM