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Date: Tue, 26 Oct 2004 03:34:45 +0200 (CEST)
From: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>
To: "Randy.Dunlap" <rddunlap@osdl.org>
cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.9-mm1
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References: <20041022032039.730eb226.akpm@osdl.org> <417D7EB9.4090800@osdl.org>
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On Mon, 25 Oct 2004, Randy.Dunlap wrote:

> Andrew Morton wrote:
> > "Randy.Dunlap" <rddunlap@osdl.org> wrote:
> >
> >>Andrew Morton wrote:
> >>
> >>>"Randy.Dunlap" <rddunlap@osdl.org> wrote:
> >>>
> >>>
> >>>>I'm trying to spend time on kexec++ this week, but this little BUG
> >>>>keeps getting in the way.  Has it already been reported/fixed?
> >>>>
> >>>>kernel BUG at arch/i386/mm/highmem.c:42!
> >>>
> >>>
> >>>oops, we did it again.

Doh.

> >>>
> >>>--- 25/drivers/ide/ide-taskfile.c~ide_pio_sector-kmap-fix	Mon Oct 25 15:54:35 2004
> >>>+++ 25-akpm/drivers/ide/ide-taskfile.c	Mon Oct 25 15:54:48 2004
> >>>@@ -304,7 +304,7 @@ static void ide_pio_sector(ide_drive_t *
> >>> 	else
> >>> 		taskfile_input_data(drive, buf, SECTOR_WORDS);
> >>>
> >>>-	kunmap_atomic(page, KM_BIO_SRC_IRQ);
> >>>+	kunmap_atomic(buf, KM_BIO_SRC_IRQ);
> >>> #ifdef CONFIG_HIGHMEM
> >>> 	local_irq_restore(flags);
> >>> #endif
> >>>_
> >>
> >>Yes, that gets further.   :(
> >>Maybe I'll just (try) apply the kexec patch to a vanilla kernel.

IDE PIO changes are the part of a vanilla kernel.

If vanilla kernel (+akpm's fix) works OK then
this bug is not mine fault. :)

> >
> > I doubt if it'll help much.  It looks like IDE PIO got badly broken.

Weird, this code was in -mm for over a month.

> > That's something we have to fix - could you work with Bart on it please?
>
> Sure.  Bart?

I need more data, IDE PIO works fine here.

> > How come your disks are running in PIO mode anyway?

Maybe disks are runing in DMA mode but some application
triggers PIO access (IDENTIFY command, S.M.A.R.T. etc.)...

> No idea.
>
>
> >>Unable to handle kernel paging request at virtual address fffea000
> >>  printing eip:
> >>c02c8e4d
> >>*pde = 0064b067
> >>*pte = 00000000
> >>Oops: 0002 [#1]
> >>SMP DEBUG_PAGEALLOC
> >>Modules linked in:
> >>CPU:    0
> >>EIP:    0060:[<c02c8e4d>]    Not tainted VLI
> >>EFLAGS: 00010006   (2.6.9-mm1)
> >>EIP is at ide_insw+0xd/0x20
> >>eax: 000001f0   ebx: c05ee7ec   ecx: 00000100   edx: 000001f0
> >>esi: c05ee7ec   edi: fffea000   ebp: c056fe80   esp: c056fe7c
> >>ds: 007b   es: 007b   ss: 0068
> >>Process swapper (pid: 0, threadinfo=c056e000 task=c0486b80)
> >>Stack: c05ee740 c056fea0 c02c93b8 000001f0 fffea000 00000100 c05ee7ec
> >>00000080
> >>        fffea000 c056fec0 c02ccf06 c05ee7ec fffea000 00000080 00000000
> >>00000000
> >>        c05ee740 c056feec c02cd62b c05ee7ec fffea000 00000080 00000000
> >>fffea000
> >>Call Trace:
> >>  [<c0107eff>] show_stack+0xaf/0xc0
> >>  [<c010808d>] show_registers+0x15d/0x1e0
> >>  [<c01082a6>] die+0x106/0x190
> >>  [<c011c707>] do_page_fault+0x517/0x6a6
> >>  [<c0107b4d>] error_code+0x2d/0x38
> >>  [<c02c93b8>] ata_input_data+0x98/0xa0
> >>  [<c02ccf06>] taskfile_input_data+0x26/0x50
> >>  [<c02cd62b>] ide_pio_sector+0xcb/0xf0
> >>  [<c02cd892>] task_in_intr+0xe2/0x100
> >>  [<c02c8c16>] ide_intr+0xb6/0x150
> >>  [<c0142cd8>] handle_IRQ_event+0x38/0x70
> >>  [<c0142df2>] __do_IRQ+0xe2/0x150
> >>  [<c0109606>] do_IRQ+0x36/0x60
> >>  [<c0107a30>] common_interrupt+0x18/0x20
> >>  [<c01050f1>] cpu_idle+0x31/0x50
> >>  [<c05709bf>] start_kernel+0x15f/0x180
> >>  [<c0100211>] 0xc0100211
> >>Code: e5 8b 55 08 ec 0f b6 c0 5d c3 8d 74 26 00 55 89 e5 8b 55 08 66
> >>ed 0f b7 c
> >>  <0>Kernel panic - not syncing: Fatal exception in interrupt
> >>  <0>Dumping messages in 0 seconds : last chance for Alt-SysRq...
>
>
> --
> ~Randy
>
-
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