Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Date | Wed, 2 Apr 2003 15:45:00 -0800 | From | Andrew Morton <> | Subject | Re: back-trace on mounting ide cd-rom |
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Robert Love <rml@tech9.net> wrote: > > I got the following errors and back-trace upon mounting my IDE CD-ROM > (hdc). It seems to be a normal ISO9660... its the Red Hat 9 CD. > > I haven't looked into it yet. Not sure why there is ext3 stuff in > there... maybe the CD-ROM mount is unrelated? Mounting the CD > subsequent times is OK. > > Kernel is 2.5.66-mm2. UP, preempt, no highmem, i686. > > Here we go: > > buffer layer error at fs/buffer.c:127
ah, my new debug code is buggy. It is legal to wait upon a zero-ref buffer if that buffer's page is locked.
diff -puN fs/buffer.c~a fs/buffer.c --- 25/fs/buffer.c~a Wed Apr 2 15:41:25 2003 +++ 25-akpm/fs/buffer.c Wed Apr 2 15:43:02 2003 @@ -123,7 +123,8 @@ void __wait_on_buffer(struct buffer_head wait_queue_head_t *wqh = bh_waitq_head(bh); DEFINE_WAIT(wait); - if (atomic_read(&bh->b_count) == 0) + if (atomic_read(&bh->b_count) == 0 && + (!bh->b_page || !PageLocked(bh->b_page))) buffer_error(); do { _
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