panic on HEAD from 3/9: vrele: missed vn_close

From: John Baldwin <jhb_at_FreeBSD.org>
Date: Fri, 11 Mar 2005 09:51:20 -0500
Got this on an Alpha DS20 (dual 500 EV6's) running HEAD from 3/9 while doing
a loop of buildworld -j 8 with 4BSD but no PREEMPTION:

login: VNASSERT failed
0xfffffc0025f68d90: tag ufs, type VFIFO
    usecount 24, writecount 24, refcount 0 mountedhere 0xfffffc0000a1f600
    flags ()
 VI_LOCKed    v_object 0

        ino 9420, on dev da1a, fifo with 23 readers and 23 writers
panic: vrele: missed vn_close
cpuid = 0
KDB: enter: panic
[thread pid 31057 tid 100224 ]
Stopped at      kdb_enter+0x48: or      zero,zero,zero  <zero=0x0>
db> tr
Tracing pid 31057 tid 100224 td 0xfffffc002282aa80
kdb_enter() at kdb_enter+0x48
panic() at panic+0x210
vrele() at vrele+0x98
vn_close() at vn_close+0xd4
vn_closefile() at vn_closefile+0x11c
fifo_close_f() at fifo_close_f+0x1c
fdrop_locked() at fdrop_locked+0xe4
fdrop() at fdrop+0x4c
closef() at closef+0x460
close() at close+0x278
syscall() at syscall+0x38c
XentSys() at XentSys+0x64
--- syscall (6, FreeBSD ELF64, close) ---
--- user mode ---
db> x 0xfffffc0025f68d90,40
0xfffffc0025f68d90:     7               0               65b789          fffffc00
0xfffffc0025f68da0:     6d5638          fffffc00        31c540d0        fffffc00
0xfffffc0025f68db0:     ba6c00          fffffc00        234941f0        fffffc00
0xfffffc0025f68dc0:     2a6fa218        fffffc00        a1f600          fffffc00
0xfffffc0025f68dd0:     0               0               bedc138         fffffc00
0xfffffc0025f68de0:     bedc158         fffffc00        a532b           0
0xfffffc0025f68df0:     25f68d90        fffffc00        0               0
0xfffffc0025f68e00:     0               0               0               0
0xfffffc0025f68e10:     0               0               0               0
0xfffffc0025f68e20:     709650          fffffc00        1000040         0
0xfffffc0025f68e30:     0               500000          65b789          fffffc00
0xfffffc0025f68e40:     34              0               ffffffff        ffffffff
0xfffffc0025f68e50:     0               0               6bf1b8          fffffc00
0xfffffc0025f68e60:     65d63d          fffffc00        65d63d          fffffc00
0xfffffc0025f68e70:     30000           0               0               0
0xfffffc0025f68e80:     0               0               0               0

-- 
John Baldwin <jhb_at_FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org
Received on Fri Mar 11 2005 - 13:50:08 UTC

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