On Sat, Jun 3, 2023 at 6:30 AM Frank Scheiner <frank.scheiner@xxxxxx> wrote:
>
> On 29.05.23 01:00, Song Liu wrote:
> > Frank reported boot regression in ia64 as:
> >
> > ELILO v3.16 for EFI/IA-64
> > ..
> > Uncompressing Linux... done
> > Loading file AC100221.initrd.img...done
> > [ 0.000000] Linux version 6.4.0-rc3 (root@x4270) (ia64-linux-gcc
> > (GCC) 12.2.0, GNU ld (GNU Binutils) 2.39) #1 SMP Thu May 25 15:52:20
> > CEST 2023
> > [ 0.000000] efi: EFI v1.1 by HP
> > [ 0.000000] efi: SALsystab=0x3ee7a000 ACPI 2.0=0x3fe2a000
> > ESI=0x3ee7b000 SMBIOS=0x3ee7c000 HCDP=0x3fe28000
> > [ 0.000000] PCDP: v3 at 0x3fe28000
> > [ 0.000000] earlycon: uart8250 at MMIO 0x00000000f4050000 (options
> > '9600n8')
> > [ 0.000000] printk: bootconsole [uart8250] enabled
> > [ 0.000000] ACPI: Early table checksum verification disabled
> > [ 0.000000] ACPI: RSDP 0x000000003FE2A000 000028 (v02 HP )
> > [ 0.000000] ACPI: XSDT 0x000000003FE2A02C 0000CC (v01 HP rx2620
> > 00000000 HP 00000000)
> > [...]
> > [ 3.793350] Run /init as init process
> > Loading, please wait...
> > Starting systemd-udevd version 252.6-1
> > [ 3.951100] ------------[ cut here ]------------
> > [ 3.951100] WARNING: CPU: 6 PID: 140 at kernel/module/main.c:1547
> > __layout_sections+0x370/0x3c0
> > [ 3.949512] Unable to handle kernel paging request at virtual address
> > 1000000000000000
> > [ 3.951100] Modules linked in:
> > [ 3.951100] CPU: 6 PID: 140 Comm: (udev-worker) Not tainted 6.4.0-rc3 #1
> > [ 3.956161] (udev-worker)[142]: Oops 11003706212352 [1]
> > [ 3.951774] Hardware name: hp server rx2620 , BIOS
> > 04.29
> > 11/30/2007
> > [ 3.951774]
> > [ 3.951774] Call Trace:
> > [ 3.958339] Unable to handle kernel paging request at virtual address
> > 1000000000000000
> > [ 3.956161] Modules linked in:
> > [ 3.951774] [<a0000001000156d0>] show_stack.part.0+0x30/0x60
> > [ 3.951774] sp=e000000183a67b20
> > bsp=e000000183a61628
> > [ 3.956161]
> > [ 3.956161]
> >
> > which bisect to module_memory change [1].
> >
> > Debug showed that ia64 uses some special sections:
> >
> > __layout_sections: section .got (sh_flags 10000002) matched to MOD_INVALID
> > __layout_sections: section .sdata (sh_flags 10000003) matched to MOD_INVALID
> > __layout_sections: section .sbss (sh_flags 10000003) matched to MOD_INVALID
> >
> > All these sections are loaded to module core memory before [1].
> >
> > Fix ia64 boot by loading these sections to MOD_DATA (core rw data).
> >
> > [1] commit ac3b43283923 ("module: replace module_layout with module_memory")
> >
> > Fixes: ac3b43283923 ("module: replace module_layout with module_memory")
> > Reported-by: Frank Scheiner <frank.scheiner@xxxxxx>
> > Closes: https://lists.debian.org/debian-ia64/2023/05/msg00010.html
> > Closes: https://marc.info/?l=linux-ia64&m=168509859125505
> > Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Song Liu <song@xxxxxxxxxx>
> > ---
> > kernel/module/main.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/kernel/module/main.c b/kernel/module/main.c
> > index b4c7e925fdb0..9da4b551321e 100644
> > --- a/kernel/module/main.c
> > +++ b/kernel/module/main.c
> > @@ -1521,14 +1521,14 @@ static void __layout_sections(struct module *mod, struct load_info *info, bool i
> > MOD_RODATA,
> > MOD_RO_AFTER_INIT,
> > MOD_DATA,
> > - MOD_INVALID, /* This is needed to match the masks array */
> > + MOD_DATA,
> > };
> > static const int init_m_to_mem_type[] = {
> > MOD_INIT_TEXT,
> > MOD_INIT_RODATA,
> > MOD_INVALID,
> > MOD_INIT_DATA,
> > - MOD_INVALID, /* This is needed to match the masks array */
> > + MOD_INIT_DATA,
> > };
> >
> > for (m = 0; m < ARRAY_SIZE(masks); ++m) {
>
> Just want to add another observation (though not strictly ia64 but I
> wanted to keep the context):
>
> Testing showed that this patch also fixes module loading for alpha
> (tested on an AlphaServer DS25 w/v6.4-rc4 w/ and w/o the patch applied).
Thanks for this information!
I noticed alpha and ia64 are the only two archs to define ARCH_SHF_SMALL.
Other archs shouldn't see change with this.
Best,
Song
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