Date: Sat, 08 Feb 2003 11:21:23 -0700 From: Scott <samsco@mho.net> To: freebsd-multimedia@freebsd.org, cg@freebsd.org, orion@freebsd.org Subject: panic in dsp_ioctl() Message-ID: <3E454AA3.6050503@mho.net>
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All,
WIth a fairly recent 5-current and ICH3 sound hardware I'm getting a
panic in dsp_ioctl() when running just about anything. The offending
section seems to be at line 457 of dsp.c:
(kgdb) l *dsp_ioctl+0xb5
0xb935 is in dsp_ioctl (/usr/src/sys/dev/sound/pcm/dsp.c:457).
452 getchns(i_dev, &rdch, &wrch, 0);
453
454 kill = 0;
455 if (wrch && (wrch->flags & CHN_F_DEAD))
456 kill |= 1;
457 if (rdch && (rdch->flags & CHN_F_DEAD))
458 kill |= 2;
459 if (kill == 3) {
460 relchns(i_dev, rdch, wrch, 0);
461 splx(s);
Since I'm not doing any recording, I would assume that rdch should be
NULL and the test would avoid the rdch->flags indirection. However, I'm
having a hard time figuring out how rdch actually gets set/initialized
in the driver, and the value that winds up in this code path is very
bogus. This wasn't a problem with my previous build a few weeks ago.
Scott
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