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2008 Jul 29
2
Unexpected b_hdr change.
...ported to
FreeBSD. Kris (CCed) observed strange situation. In function arc_read()
he had a panic on assertion that we try to unlock a lock which is not
beeing held:
rw_enter(&pbuf->b_hdr->b_datalock, RW_READER);
err = arc_read_nolock(pio, spa, bp, done, private, priority,
flags, arc_flags, zb);
rw_exit(&pbuf->b_hdr->b_datalock); <--- THIS ONE
The only possiblity was that b_hdr for pbuf was changed somewhere. We
diagnozed this further and the b_hdr field is changed in arc_release()
function, here:
buf->b_hdr = nhdr;
Backtrace for this change is the following:
a...