i386/68502: ATA panics in UDMA33 mode (worked OK in 5.2.1-R)

Alexei Khalimov lesha at intercaf.ru
Wed Jun 30 00:40:37 PDT 2004

>Number:         68502
>Category:       i386
>Synopsis:       ATA panics in UDMA33 mode (worked OK in 5.2.1-R)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-i386
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jun 30 07:40:28 GMT 2004
>Originator:     Alexei Khalimov
>Release:        5.2-CURRENT (Jun 30)
FreeBSD urri.intercaf.ru 5.2-CURRENT FreeBSD 5.2-CURRENT #1: Wed Jun 30 10:36:24 MSD 2004  urri at urri.intercaf.ru:/usr/src/sys/i386/compile/URRI i386
ATA driver panics system if run in DMA mode
hw.ata.ata_dma="0" works fine, but PIO4 is so slow.
Everything worked just fine with 5.2.1-RELEASE

atapci0: <SiS 961 UDMA100 controller> port
 0x110b-0x111a,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 2.5 on pci0
ata0: at 0x1f0 irq 14 on atapci0
ata0-master: DMA limited to UDMA33, non-ATA66 cable or device
ad0: 19077MB <IC25N020ATMR04-0> [38760/16/63] at ata0-master UDMA33
ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=39070017
ad0: DMA limited to UDMA33, non-ATA66 cable or device
kernel trap 12 with interrupts disabled

Fatal trap 12: page fault while in kernel mode
fault virtual address        = 0x74
fault code 			   = supervisor read, page not present
instruction pointer          = 0x8:0xc050f615
stack pointer                 = 0x10:0xc7683c48
frame pointer                 = 0x10:0xc7683c4c
code segment               = base 0x0, limit 0xfffff, type 0x1b
                                  = DPL 0, pres 1, def32 1, gran 1
processor eflags           = resume, IOPL = 0
current process            = 5 (taskqueue)
trap number                 = 12
panic: page fault

syncing disks, buffers remaining...
Uptime: 6s
Install 5.2-CURRENT on loosy laptop with UDMA33 disk.
Boot and enjoy immediate panic.

Currently unknown.

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