Hello
I have a Xen domU that now frequently panics with "biodone2 already". I
suspect it started after upgrading to NetBSD 8.0.
The offending code is in src/sys/kern/vfs_bio.c (see below). I wonder if
we could not just release the mutex and exit in that case. Can it make
some harm?
static void
biodone2(buf_t *bp)
{
void (*callout)(buf_t *);
SDT_PROBE1(io, kernel, ,done, bp);
BIOHIST_FUNC(__func__);
BIOHIST_CALLARGS(biohist, "bp=%#jx", (uintptr_t)bp, 0, 0, 0);
mutex_enter(bp->b_objlock);
/* Note that the transfer is done. */
if (ISSET(bp->b_oflags, BO_DONE))
panic("biodone2 already");
Cou
--
Emmanuel Dreyfus
http://hcpnet.free.fr/pubz
m...@netbsd.org
