Date: Sat, 30 Nov 2002 15:43:05 +0300 (MSK) From: "Yan V.Batuto" <batuto@wgc.chem.pu.ru> To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/45871: Kernel trap 12 in sound/pcm code Message-ID: <20021130124305.88D951D80@yb3791.spb.edu>
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>Number: 45871
>Category: kern
>Synopsis: Kernel trap 12 in sound/pcm code
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sat Nov 30 06:10:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator: Yan V. Batuto
>Release: FreeBSD 4.7-STABLE i386
>Organization:
St. Petersburg State University
>Environment:
System: FreeBSD 4.7-STABLE #0: Fri Nov 29 01:05:16 MSK 2002 i386
Motherboard: JetWay V333U (VIA KT333 with VT8235 south bridge)
pcm0: <VIA VT8235> port 0xe400-0xe4ff irq 5 at device 17.5 on pci0
>Description:
Kernel crashes usually during KDE initialization. It depends on
KDE configuration ("rm -rf ~/.kde && startx startkde" never
crashed yet, and AC'97 sound worked OK), and hw.snd.pcm0.vchans
setting. Kernel trap with hw.snd.pcm0.vchans=4 at least much
more probable than with vchans=0.
Trap occurs in dev/sound/pcm/feeder_rate.c:171
==== from gdb session ====
165 alpha += info->srcinc;
166 spos += (alpha >> 16) * 2;
167 alpha &= 0xffff;
168
169 }
170 info->alpha = alpha & 0xffff;
171 info->buffer[0] = info->buffer[spos - hidelta];
172 info->buffer[1] = info->buffer[spos - hidelta + 1];
(kgdb) print spos-hidelta
$1 = -2
(kgdb) print info->buffer[spos-hidelta]
Cannot access memory at address 0xc0fe0ffc.
==== from gdb session ====
>How-To-Repeat:
>Fix:
As a ugly workaround try to
sysctl -w hw.snd.pcm0.vchans=0
but I'm NOT sure it is sufficiently.
>Release-Note:
>Audit-Trail:
>Unformatted:
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