Radek Kozlowski wrote: > On Fri, Aug 06, 2004 at 01:33:46PM -0700, Nate Lawson wrote: > >>I took a quick look at this ATA panic. The exact same one occurs for >>Ceri. A quick dissassemble shows that the testb is the check for the >>DMA flag at the very end of ata_generic_transaction(). The bug appears >>to be that this may be a PIO request (since the DMA check is outside the >>switch() statement). The fix is to make sure it's a DMA request before >>dereferencing an element of the DMA struct. Try the attached patch. > > > Another panic on boot with fresh -CURRENT, however this time ad0 is in > UDMA100 mode: > > <snip> > ad0: 38154MB <IC25N040ATMR04-0/M020AD0A> [77520/16/63] at ata0-master UDMA100 > > Fatal trap 12: page fault while in kernel mode > fault virtual address = 0x24 > fault code = supervisor read, page not present > instruction pointer = 0x8 :0xc0544896 > stack pointer = 0x10 :0xd302db70 > frame pointer = 0x10 :0xd302db70 > code segment = base 0x0, limit 0xffffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 4 (g_down) > [thread 100033] > Stopped at rman_get_bustag+0x6: movl 0x24(%eax),%eax > db> trace > rman_get_bustag(0,d302db84,0,c1a33000,c8000000) at rman_get_bustag+0x6 > ata_pci_dmastart(c1854200,c8,0,0,1) at ata_pci_dmastart+0x17 > ata_generic_transaction(c1b3ea8c,c1b3ea8c,1f4,c0537399,0) at ata_generic_transaction+0x2e3 > ata_start(c1854200,0,c1b3ea8c,c1854200,c1b42dec) at ata_start+0x279 > ata_queue_request(c1b3ea8c,0,101,0,d302dc44,d302dc58,0,0,0,efd88083,2be897c,c1b42dec,c1aadd80) at ata_queue_request+0x1fc > ad_start(c18542a8,c053e221,c1aaddc8,c1b42dec,c1aadd80) at ad_start+0x398 > ata_start(c1854200,c1b42dec,0,0,c1b42dec) at ata_start+0xc8 > adstrategy(c1b42dec,0,200,0,200) at adstrategy+0xce > g_disk_start(c1b42e70,c0736028,24c,c06deea3,a) at g_disk_start+0x1b6 > g_io_schedule_down(c188f000,c189e534,d302dd34,c0508650,0) at g_io_schedule_down+0x150 > g_down_procbody(0,d302dd48,0,0,0) at g_down_procbody+0x1e > fork_exit(c04e4f80,0,d302dd48) at fork_exit+0x80 > fork_trampoline() at fork_trampoline+0x8 > --- trap 0x1, eip = 0, esp = 0xd302dd7c, ebp = 0 --- > > -Radek ctlr->r_res1 is NULL but a DMA transaction is being started. This results in a NULL pointer being passed to rman_get_bustag(). ata_pci_attach() should not be setting the dmainit routine to ata_pci_dmainit() if it can't enable busmastering. There are a myriad of places to address this so I'm not sure where Soeren will want to fix this. I'm still working with you privately on why r_res1 can't be allocated. -NateReceived on Fri Aug 13 2004 - 17:54:14 UTC
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