RE: [PATCH 0/2] Fix boot hang issue on Ampere Emag server

[Justin He]

> -----Original Message-----
> From: Justin He
> Sent: Tuesday, January 31, 2023 11:22 PM
> To: Ard Biesheuvel <ardb@xxxxxxxxxx>; Jason A. Donenfeld <Jason@xxxxxxxxx>
> Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>; linux-efi@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; Alexandru Elisei <Alexandru.Elisei@xxxxxxx>
> Subject: RE: [PATCH 0/2] Fix boot hang issue on Ampere Emag server
>
> Hi Ard,
>
> > -----Original Message-----
> > From: Ard Biesheuvel <ardb@xxxxxxxxxx>
> > Sent: Tuesday, January 31, 2023 3:19 PM
> > To: Justin He <Justin.He@xxxxxxx>; Jason A. Donenfeld <Jason@xxxxxxxxx>
> > Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>; linux-efi@xxxxxxxxxxxxxxx;
> > linux-kernel@xxxxxxxxxxxxxxx; Alexandru Elisei <Alexandru.Elisei@xxxxxxx>
> > Subject: Re: [PATCH 0/2] Fix boot hang issue on Ampere Emag server
> >
> > (cc Jason for awareness)
> >
> > On Tue, 31 Jan 2023 at 05:04, Jia He <justin.he@xxxxxxx> wrote:
> > >
> > > I met a hung task warning and then kernel was hung forever with latest
> > > kernel on an Ampere Emag server.
> > >
> > > The root cause is kernel was hung  when invoking an efi rts call to
> > > set the RandomSeed variable during the booting stage. The
> > > arch_efi_call_virt call (set_variable) was never returned and then caused
> the
> > hung task error.
> > >
> >
> > Given that EFI variables work on this platform (as far as I know), the problem
> > may be that we are calling SetVariable() too early.
> >
> > Could you double check whether setting variables works as expected?
> > You can use efibootmgr -t 10 as root (for example) to set the boot timeout,
> and
> > check whether the new value is retained after a reboot (efibootmgr will print
> > the current value for you)
> >
> > Could you also please share the kernel log up until the point where it hangs?
> >
> The set_variable seems to be ok in 5.19+:
> root@:~# efibootmgr -t 10
> BootCurrent: 0000
> Timeout: 10 seconds
> BootOrder: 0000,0004,0003,0002,0001
> Boot0000* ubuntu
> Boot0001* grub
> Boot0002* UEFI: Built-in EFI Shell
> Boot0003* UEFI: PXE boot on MAC: 4C:38:D5:08:F6:02
> Boot0004* ubuntu
> root@:~# efibootmgr -t 9
> BootCurrent: 0000
> Timeout: 9 seconds
> BootOrder: 0000,0004,0003,0002,0001
> Boot0000* ubuntu
> Boot0001* grub
> Boot0002* UEFI: Built-in EFI Shell
> Boot0003* UEFI: PXE boot on MAC: 4C:38:D5:08:F6:02
> Boot0004* ubuntu
> root@:~# uname -a
> Linux $machine_name 5.19.0+ #228 SMP Wed Aug 17 13:22:29 UTC 2022
> aarch64 aarch64 aarch64 GNU/Linux
>
> The dmesg log until the hung(some information was removed, eg, hostname):
>
Sorry, I noticed my previous mail might be bounced back if the text is too long.
I pasted it to online Pastebin.com
https://pastebin.com/3zQyryp1

Hope it helps

Cheers,
Justin
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