On Tue, 14 Apr 2009, Joe Marcus Clarke wrote: > I'm seeing this panic on my -CURRENT i386 Tinderbox machine (using > looped back NFS). The backtrace does not point to a line number in > vfs_cache.c, and I can't figure out how atomic_cmpset_int is being > called, so I'm confused as to exactly what is causing this. Any clues? > Only a clue. but I'd guess it's one of the SDT_PROBE()s. I think they us sx_xlock() and that uses atomic_cmpset_int(). I don't know anything about SDT_PROBE(), but I did notice that this one uses cn_nameptr, which I don't think is always null terminated. You could try commenting out the SDT_PROBE()s in cache_lookup() and see if it helps? rick - around line #440 in vfs_cache.c /* We failed to find an entry */ if (ncp == NULL) { ---> SDT_PROBE(vfs, namecache, lookup, miss, dvp, cnp->cn_nameptr, NULL, 0, 0); if ((cnp->cn_flags & MAKEENTRY) == 0) { nummisszap++; } else { nummiss++; } nchstats.ncs_miss++; goto unlock; }Received on Tue Apr 14 2009 - 22:19:03 UTC
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