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SubjectRe: [2.6] kernel BUG at arch/i386/mm/highmem.c:14!
On Tue, Aug 26 2003, Roger Luethi wrote:
> This BUG immediately followed my turning off DMA on hda (with a mounted
> partition and dirty buffers). Register and stack info are available upon
> request (screenshot). 2.6.0-test4.
> Roger
> kernel BUG at arch/i386/mm/highmem.c:14!
> invalid operand: 0000 [#1]
> CPU: 0
> EIP: 0060:[<c011bc36>] Not tainted
> EFLAGS: 00010206
> EIP is at kunmap+0x16/0x30
> [...]
> Process pdflush [...]
> [<c0158f69>] __blk_queue_bounce+0x1e9/0x230
> [<c0158fe7>] blk_queue_bounce+0x37/0x60

Funky, it is indeed strictly forbidden to enter this path with
interrupts disabled.

> [<c022be20>] __make_request+0x50/0x670
> [<c023ccb0>] task_mulout_intr+0x0/0x290
> [<c022c584>] generic_make_request+0x144/0x1e0

Possibly some artifact of using read/write multiple on IDE, does it work
if you disable that with -m0 on the device? I'm guessing the error is
100% reproducible?

Jens Axboe

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