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Re: "BUG: soft lockup" on A1200; was: Re: Updated installation images for Debian Ports 2019-04-20



Hi Geert,

On 18/06/19 6:56 PM, Geert Uytterhoeven wrote:
Hi Michael,

On Mon, Jun 17, 2019 at 11:22 PM Michael Schmitz <schmitzmic@gmail.com> wrote:
On 15/06/19 11:15 AM, Finn Thain wrote:
On Wed, 12 Jun 2019, Szymon Bieganski wrote:
Here is the end of dmesg (full log in attachment) when kernel stalls,
just as before:

------------------------

[  122.430000] This architecture does not have kernel memory protection.
[  122.440000] Run /init as init process
[  126.690000] calling  ide_init+0x0/0x7c [ide_core] @ 43
[  126.700000] Uniform Multi-Platform E-IDE driver
[  126.710000] initcall ide_init+0x0/0x7c [ide_core] returned 0 after
7988 usecs
[  126.980000] calling  amiga_gayle_ide_driver_init+0x0/0x1c [gayle] @ 43
[  126.990000] ide: Gayle IDE controller (A1200 style)
[  127.000000] Probing IDE interface ide0...
[  127.390000] hda: probing with STATUS(0x50) instead of ALTSTATUS(0x0a)
[  127.540000] hda: SAMSUNG MP0402H, ATA DISK drive
[  127.610000] Z2RAM: using 0K Zorro II RAM and 512K Chip RAM (Total 512K)
[  127.980000] hdb: probing with STATUS(0x00) instead of ALTSTATUS(0x0a)
[  128.200000] hdb: probing with STATUS(0x00) instead of ALTSTATUS(0x0a)
[  148.570000] watchdog: BUG: soft lockup - CPU#0 stuck for 22s!
[systemd-udevd:43]
Finn has raised the issue of systemd's short timeouts before. I'm
wondering whether that's part of your problem here. But the IDE driver
probe for a second disk should eventually complete, regardless of
systemd's udev module crashing?

Not sure whether the 'probing with STATUS instead of ALTSTATUS' message
is normal for the A1200. Geert might remember that sort of detail.
That comes from drivers/ide/ide-probe.c:ide_dev_read_id().
Looking at the code, it may be caused by the drive, too.


I don't see IDE_HFLAG_BROKEN_ALTSTATUS set anywhere in the kernel code except drivers/ide/amd74xx.c. gayle.c sets:

        .host_flags             = IDE_HFLAG_MMIO | IDE_HFLAG_SERIALIZE |
                                  IDE_HFLAG_NO_DMA,

So how would that flag bit get set for the gayle driver?

Cheers,

    Michael


I do not see it on A4000.

W.r.t. completing the probe, a log with dump_stack() added was sent
to me by PM, and I replied the below:

 From that log, I'm wondering if something is stuck in ide_probe_port().

Can you sprinkle some debug prints

     printk("%s:%u\n", __func__, __LINE__);

in ide_probe_port() and probe_for_drive() (drivers/ide/ide-probe.c) and retry?

Thanks!

FTR, I've just booted my A4000 with a v5.2-rc5-based kernel, and IDE
(Gayle, single drive) works. But old Debian, no systemd.

Gr{oetje,eeting}s,

                         Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                 -- Linus Torvalds


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