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

[Michael Schmitz <schmitzmic@gmail.com>]

Szymon,

On 19/06/19 7:50 AM, Szymon Bieganski wrote:
> Hello Geert,
>
> On 6/18/19 8:56 AM, Geert Uytterhoeven wrote:
> > 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?
> I've recompiled with addition of these extra lines, and found out that
> the re-enable of irq = 2 hangs (see attached log for details)
>
> ===================
> printk("%s:%u\n", __func__, __LINE__);
>          /*
>           * Use cached IRQ number. It might be (and is...) changed by probe
>           * code above
>           */
> printk("irqd = %u\n", irqd);    // printed last


Does the heartbeat LED keep flashing past this point? I wonder whether 
there's an interrupt still pending on the IDE interface that wasn't 
cleared when the probe for hdb timed out.

Can you add more output to check where ide_dev_read_id() exits in this 
case? And maybe add

(void)tp_ops->read_status(hwif);

before the return instruction taken?

Cheers,

    Michael


>          if (irqd) {
>                  enable_irq(irqd);
> printk("enabled IRQ %u\n", irqd);
>          }
> printk("%s:%u\n", __func__, __LINE__);
>          return rc;
>
> ====================
>
>
> The interrupts present on my machine are:
>
> (initramfs) cd
> /proc
> (initramfs) cat interrupts
>             CPU0
>    2:          5      auto      CIAA, apne
>    6:       5973      auto      CIAB
>    8:        580     amiga      serial TX
>    9:          0     amiga      floppy_dma
>   12:       2110     amiga      fb vertb handler
>   13:       1925     amiga      serial status
>   19:         44     amiga      serial RX
>   23:          4       cia      floppy_timer
>   25:          0       cia      amikbd
>   27:       5973       cia      timer
> ERR:          0
>
> I hope I provided enough information this time.
>
> With kind regards,
>
> Szymon