Kernel Panic - V6.2 - Reseved memory issue

[Lucas Tanure]

On Sun, Apr 2, 2023 at 1:55 PM Bagas Sanjaya <bagasdotme at gmail.com> wrote:
>
> On Sun, Apr 02, 2023 at 09:10:36AM +0100, Lucas Tanure wrote:
> > Log:
> >
> > [ 9.792966] SError Interrupt on CPU3, code 0x00000000bf000000 -- SError
> > [ 9.792980] CPU: 3 PID: 3471 Comm: kded5 Tainted: G C 6.2.0 #1
> > [ 9.792985] Hardware name: Khadas VIM3 (DT)
> > [ 9.792987] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > [ 9.792991] pc : kmem_cache_free_bulk.part.98+0x1f0/0x528
> > [ 9.793004] lr : kmem_cache_free_bulk.part.98+0x2f8/0x528
> > [ 9.793008] sp : ffff80000a2eb7f0
> > [ 9.793009] x29: ffff80000a2eb7f0 x28: ffff00001f358518 x27: ffff000000008800
> > [ 9.793016] x26: ffff00000262b300 x25: ffff00000262b300 x24: 0000000000000001
> > [ 9.793019] x23: ffff00000262b000 x22: 0000000000000000 x21: ffff00001f358538
> > [ 9.793022] x20: fffffc0000098ac0 x19: 0000000000000004 x18: 0000000000000040
> > [ 9.793025] x17: 0000000000000018 x16: 00000000000007f8 x15: 0000000000000003
> > [ 9.793028] x14: 0000000000000006 x13: ffff800008e48550 x12: 0000ffff9dc91fff
> > [ 9.793031] x11: 0000000000000004 x10: 0000000000000001 x9 : ffff000007e93680
> > [ 9.793035] x8 : 0000000000000020 x7 : ffff000001d2b100 x6 : 0000000000000007
> > [ 9.793037] x5 : 0000000000000020 x4 : ffff000000008800 x3 : 0000000000000001
> > [ 9.793040] x2 : 0000000000000007 x1 : 0000000000000000 x0 : ffff00001f358540
> > [ 9.793045] Kernel panic - not syncing: Asynchronous SError Interrupt
> >
> > This doesn't happen with downstream Khadas 6.2 kernel, and that's
> > because the downstream kernel removed this from
> > early_init_dt_reserve_memory (drivers/of/fdt.c):
> >
> > /*
> > * If the memory is already reserved (by another region), we
> > * should not allow it to be marked nomap, but don't worry
> > * if the region isn't memory as it won't be mapped.
> > */
> > if (memblock_overlaps_region(&memblock.memory, base, size) &&
> >     memblock_is_region_reserved(base, size))
> >           return -EBUSY;
> >
>
> What commit on downstream kernel that fix the issue?
Here:
https://github.com/khadas/linux/commit/2cb57b1071bf69f615fedc999b7ecacf2cde7228

 Can you reproduce
> on mainline with above conditional removed?
No, without that code mainline works fine.


Alternatively, can
> you post the downstream fix here?
Same https://github.com/khadas/linux/commit/2cb57b1071bf69f615fedc999b7ecacf2cde7228

>
> Also, can you find last working commit on mainline? If so, this is
> regression.
That is difficult as 5.13.0 has the line:
OF: fdt: Reserved memory: failed to reserve memory for node
'secmon at 5000000': base 0x0000000005000000, size 3 MiB
But doesn't crash. It could be that no process used that address so no crash.

>
> Thanks.
>
> --
> An old man doll... just what I always wanted! - Clara