Re: kern/51746 (Panics from audio)

[coypu%SDF.ORG@localhost]

The following reply was made to PR kern/51746; it has been noted by GNATS.

From: coypu%SDF.ORG@localhost
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/51746 (Panics from audio)
Date: Sun, 19 Feb 2017 23:33:19 +0000

 Unfortunately...
 NetBSD box 7.99.60 NetBSD 7.99.60 (GENERIC) #1: Fri Feb 17 12:54:49 IST 2017  fly@box:/usr/amd64/sys/arch/amd64/compile/GENERIC amd64
 
 fatal page fault in supervisor mode
 trap type 6 code 0 rip ffffffff80754ac5 cs 8 rflags 10246 cr2 0 ilevel 0 rsp fffffe811df9fc30
 curlwp 0xfffffe847b6a4080 pid 28791.100 lowest kstack 0xfffffe811df9c2c0
 panic: trap
 cpu8: Begin traceback...
 vpanic() at netbsd:vpanic+0x140
 snprintf() at netbsd:snprintf
 startlwp() at netbsd:startlwp
 alltraps() at netbsd:alltraps+0x9e
 audio_write() at netbsd:audio_write+0x253
 audiowrite() at netbsd:audiowrite+0x6f
 dofilewrite() at netbsd:dofilewrite+0x97
 sys_write() at netbsd:sys_write+0x5f
 syscall() at netbsd:syscall+0x1d2
 --- syscall (number 4) ---
 7a4b4123dcda:
 cpu8: End traceback...
 
 dumping to dev 0,1 (offset=8, size=4150224):
 dump
 
 (gdb) list *(audio_write+0x253)
 0xffffffff8074f112 is in audio_write (/usr/src/sys/dev/audio.c:2854).
 2849			if (vc->sc_npfilters > 0) {
 2850				filter = vc->sc_pfilters[0];
 2851				filter->set_fetcher(filter, &ufetcher.base);
 2852				fetcher = &vc->sc_pfilters[vc->sc_npfilters - 1]->base;
 2853				cc = cb->blksize * 2;
 2854				error = fetcher->fetch_to(sc, fetcher, &stream, cc);
 2855				if (error != 0) {
 2856					fetcher = &ufetcher.base;
 2857					cc = vc->sc_pustream->end -
 2858					    vc->sc_pustream->start;