I got a crash today because "xvp" did not have an interlock when the
call was made to vn_lock(LK_INTERLOCK):
407 if (snapdebug)
408 vprint("ffs_snapshot: busy vnode", xvp);
409 if (vn_lock(xvp, LK_EXCLUSIVE | LK_INTERLOCK, td) != 0)
410 goto loop;
411 xp = VTOI(xvp);
412
I don't in fact see any reason why "xvp" would have been locked already
and that this could possibly be valid in the face of a mountpoint which
had any vnodes at all open. This occurred on fscking my "/tmp"
filesystem because of crashes (due to an SSE utilization bug in the
kernel, it seems), which I'm sure was a filesystem in heavy use already.
Does anyone have any insight on what the correct fix to this is? I
don't have any idea exactly how to correct the locking in this function.
Thanks for insight!
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