Date: Mon, 8 May 1995 11:01:59 -0700 From: John Dyson <dyson@Root.COM> To: freebsd-bugs@FreeBSD.org, sung!imdave@iwcs.att.com Subject: Re: Process hangs sleeping in ufslk2 Message-ID: <199505081801.LAA00848@Root.COM>
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When installing pdksh on the April snapshot, you are likely to run
into this problem. It comes about because of a bug in the
merged VM/Buffer cache code. (Specifically, that version of the
code could not deal with I/O to/from an mmaped region to the file
that the mmaped region represents.)
Something like this:
fd = open("evilfile", O_RDWR);
addr = mmap(...,fd,...)
write(fd, addr, size); -- you hang here.
This problem has been fixed in the -current and in the 2.0.5 release
coming up. It is very likely that many of the "mysterious" ufslk2
hangs had been due to this.
Personal note: Dave, I am at Lisle (810-6136...)
John
dyson@root.com
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