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Subject[2.6] kernel BUG at arch/i386/mm/highmem.c:14!
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.


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
[<c022be20>] __make_request+0x50/0x670
[<c023ccb0>] task_mulout_intr+0x0/0x290
[<c022c584>] generic_make_request+0x144/0x1e0
[<c0176fec>] bio_alloc+0xcc/0x1a0
[<c022c65d>] submit_bio+0x3d/0x70
[<c01c80e0>] reiserfs_write_full_page+0x210/0x350
[<c01c8265>] reiserfs_writepage+0x25/0x40
[<c019ed3f>] mpage_writepages+0x38f/0x4d0
[<c01c8240>] reiserfs_writepage+0x0/0x40
[<c014e375>] do_writepages+0x35/0x40
[<c019c644>] __sync_single_inode+0x194/0x470
[<c010a10c>] common_interrupt+0x18/0x20
[<c019cce1>] sync_sb_inodes+0x1d1/0x3d0
[<c019d041>] writeback_inodes+0x161/0x420
[<c014d0a9>] get_page_state+0x19/0x20
[<c014e1bc>] wb_kupdate+0xdc/0x160
[<c014eb0c>] __pdflush+0x21c/0x5f0
[<c014eee0>] pdflush+0x0/0x20
[<c014eef1>] pdflush+0x11/0x20
[<c014e0e0>] wb_kupdate+0x0/0x160
[<c0107259>] kernel_thread_helper+0x5/0xc
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