port-macppc/56375: kernel crashes from wdc dma

[martin%NetBSD.org@localhost]

>Number:         56375
>Category:       port-macppc
>Synopsis:       kernel crashes from wdc dma
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-macppc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Aug 25 11:55:00 +0000 2021
>Originator:     Martin Husemann
>Release:        NetBSD 9.99.88
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD gethsemane.aprisoft.de 9.99.88 NetBSD 9.99.88 (GETHSEMANE) #126: Wed Aug 25 10:24:48 CEST 2021 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/macppc/compile/GETHSEMANE macppc
Architecture: powerpc
Machine: macppc
>Description:

During hard disk usage (but nothing special) I repeatadly got:

[ 3910.7564579] panic: pmap_pvo_find_va: returning NULL for kernel pmap, va: 0x4e65000
[ 3910.7564579] cpu0: Begin traceback...
[ 3910.7564579] 0x10003aa0: at vpanic+0x12c
[ 3910.7564579] 0x10003ad0: at panic+0x50
[ 3910.7564579] 0x10003b10: at pmap_pvo_find_va+0x134
[ 3910.7564579] 0x10003b20: at pmap_extract+0xc8
[ 3910.7564579] 0x10003b40: at wdc_obio_dma_init+0x374
[ 3910.7564579] 0x10003bb0: at wdc_ata_bio_start+0x2bc
[ 3910.7564579] 0x10003c10: at ata_xfer_start+0x4c
[ 3910.7564579] 0x10003c30: at atastart+0x298
[ 3910.7564579] 0x10003c70: at wdstart1+0x1d0
[ 3910.7564579] 0x10003c90: at wd_diskstart+0xa0
[ 3910.7564579] 0x10003cb0: at dk_start+0x128
[ 3910.7564579] 0x10003cf0: at wdc_ata_bio_done+0x88
[ 3910.7564579] 0x10003d10: at wdc_ata_bio_intr+0x204
[ 3910.7564579] 0x10003d40: at wdcintr+0xdc



>How-To-Repeat:
n/a

>Fix:
n/a