Here are some additional information.I added a dump_stack() where the warning happened and changed pr_warning() to panic(). here is the output. I am using linux 2.6.32.9. Is it scsi drivers where i should look into, to make the scsi do not request for memory reserved by octeon? [<ffffffff8110e718>] dump_stack+0x8/0x34 [<ffffffff811144ec>] octeon_map_dma_mem+0x4dc/0x538 [<ffffffff81126a50>] dma_map_sg+0xa0/0xe0 [<ffffffff812e1c98>] scsi_dma_map+0x40/0x50 [<ffffffff8130297c>] aac_build_sgraw+0x44/0x1a0 [<ffffffff81302cd0>] aac_read_raw_io+0x98/0x120 [<ffffffff81300f50>] aac_scsi_cmd+0xb48/0x14b8 [<ffffffff812ff39c>] aac_queuecommand+0x94/0xa8 [<ffffffff812d9c74>] scsi_dispatch_cmd+0x104/0x260 [<ffffffff812dff94>] scsi_request_fn+0x374/0x430 [<ffffffff81279e48>] generic_unplug_device+0x38/0x50 [<ffffffff8118328c>] sync_page+0x4c/0x70 [<ffffffff811832c0>] sync_page_killable+0x10/0x48 [<ffffffff8110fb2c>] __wait_on_bit_lock+0xcc/0x158 [<ffffffff811831b0>] __lock_page_killable+0x50/0x60 [<ffffffff8118549c>] generic_file_aio_read+0x444/0x6c0 [<ffffffff811b81dc>] do_sync_read+0xbc/0x120 [<ffffffff811b8fc4>] vfs_read+0xb4/0x178 [<ffffffff811b9170>] SyS_read+0x48/0xa0 [<ffffffff81102bc4>] handle_sys64+0x44/0x60 Kernel panic - not syncing: dma_map_single: conflict 0xffc00000 On Mon, Mar 22, 2010 at 3:01 PM, Zhuang Yuyao <mlistz@xxxxxxxxx> wrote: > Hi, > > I've got a strange dma error on my cavium cn56xx board. > > ...... > dma_map_single: Warning: Mapping memory address that might conflict > with devices 0xfbb8f000-0xfbb8ffff > dma_map_single: Warning: Mapping memory address that might conflict > with devices 0xfb2ef000-0xfb2f0fff > dma_map_single: Warning: Mapping memory address that might conflict > with devices 0xfb3de000-0xfb3defff > dma_map_single: Warning: Mapping memory address that might conflict > with devices 0xfb3dd000-0xfb3ddfff > dma_map_single: Warning: Mapping memory address that might conflict > with devices 0xfac28000-0xfac29fff > dma_map_single: Warning: Mapping memory address that might conflict > with devices 0xfad1a000-0xfad1bfff > ..... > > this error appeared when I plugged 4G or 8G ram on the board, if there > is only 2G ram on the board, the error never happened. > > an adaptec 3405 pci-e raid card is plugged on the board, and a > harddisk attached. the program i am running is a postgresql server > with more than 20 million record, so do a count(*) will let postgresql > consume almost all of the available memory. while there is 4G ram, the > 'free' command reported that the free memory is below 18M. > > then the error kept printing on the console for a while, then kernel panic. > > the warning message is come from arch/mips/cavium-octeon/dma-octeon.c > > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=arch/mips/cavium-octeon/dma-octeon.c;h=be531ec1f2064b590b58dfe8b4db4f5534999bab;hb=HEAD > > i tried several raid card from different producer, including LSI and > Adaptec. the same error always happened while there are more than or > equal to 4G memory on the board. > > Would you please give some advice on this issue? any help will be appreciated. > > Thanks. > > Zhuang Yuyao >
