On 23.03.21 17:57, Christoph Hellwig wrote:
On Tue, Mar 23, 2021 at 05:50:59PM +0100, Jan Engelhardt wrote:
Some participants in the discussion over at the debian-sparc list mentioned
"NFS" and "Invalid argument", which is something I know just too well from
iptables. NFS is a filesystem that uses an extra data blob (5th argument to the
mount syscall). Such blobs have historically not always been designed to bear
the same layout between ILP32 and LP64 modes, and nfs's structs fell prey to
this as well.

My hypothesis now is that fs/nfs/fs_context.c line 1160:

        if (in_compat_syscall())

and ones similar to it (I didn't look too close where nfs3 gets to do its
conversion), no longer trigger as a result of compat_sys_mount being
wiped from the syscall table:

No, if in_compat_syscall() syscall doesn't trigger properly the kernel
would not get this far.

That being said, the NFS compat code was moved out of the compat mount
handler and into nfs and refactored in the commit just before this one.

Frank, can you double check that commit
67e306c6906137020267eb9bbdbc127034da3627 really still works, and
only 028abd9222df0cf5855dab5014a5ebaf06f90565 broke your setup?

Indeed, I also expected 67e306c6906137020267eb9bbdbc127034da3627 to fail
because of its commit message, but from my log it did work correctly.

As the T1000 is at home and I don't have another T1 based system in my
storage location where I am now, I'll double check that in the evening
and report back.

Strangely for a V245 (with UltraSPARC IIIi) both commits seem to work
according to my testing, but 5.10.x (from Debian) doesn't work and
5.9.15 (also from Debian) does work - tested now both for boot from
network and boot from disk.

Possibly unrelated to the problem with the T1000, the V245 emits the
following for boot from disk with 5.10.x:

Loading Linux 5.10.0-5-sparc64-smp ...
Loading initial ramdisk ...

[    2.602821] rtc_cmos rtc_cmos: IRQ index 0 not found
/dev/sda2: clean, 33516/8454144 files, 1105784/33798750 blocks
[   13.542728] autofs4:pid:1:autofs_fill_super: called with bogus options
[   13.628931] systemd[1]: proc-sys-fs-binfmt_misc.automount: Failed to
initialize automounter: Invalid argument
[   13.759917] systemd[1]: Failed to set up automount Arbitrary
Executable File Formats File System Automount Point.
[FAILED] Failed to set up automount  File System Automount Point.
[   14.456396] Unable to handle kernel paging request in mna handler
[   14.456400]  at virtual address da65f2fed110e482
[   14.597474] current->{active_,}mm->context = 00000000000000ce
[   14.597478] current->{active_,}mm->pgd = fff0000006d5c000
[   14.752380] Unable to handle kernel paging request in mna handler
[   14.752383]  at virtual address da65f2fed110e482
[   14.893509] current->{active_,}mm->context = 0000000000000094
[   14.969141] current->{active_,}mm->pgd = fff00011010e0000
[   15.040554] Kernel panic - not syncing: Attempted to kill init!
[   15.141430] Press Stop-A (L1-A) from sun keyboard or send break
[   15.141430] twice on console to return to the boot prom
[   15.141459] kernel BUG at kernel/cpu.c:960


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