Date: Mon, 9 Mar 2009 14:15:22 +0100 From: "Paul B. Mahol" <onemda@gmail.com> To: freebsd-current <freebsd-current@freebsd.org> Subject: nullfs: panic: vrele: negative ref cnt Message-ID: <3a142e750903090615t63a594e8rbadd7f7231049180@mail.gmail.com>
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Hi,
here is part of textdump:
db:1:lockinfo> show locks
db:1:locks> show alllocks
Process 722 (sh) thread 0xc4134000 (100065)
db:1:alllocks> show lockedvnods
Locked vnodes
db:0:kdb.enter.panic> show pcpu
cpuid = 1
curthread = 0xc4134000: pid 722 "sh"
curpcb = 0xc3ba8d90
fpcurthread = 0xc4134000: pid 722 "sh"
idlethread = 0xc3d08d80: pid 10 "idle: cpu1"
APIC ID = 1
currentldt = 0x50
spin locks held:
db:0:kdb.enter.panic> bt
Tracing pid 722 tid 100065 td 0xc4134000
kdb_enter(c0610bfe,c0610bfe,c061db9e,c3ba8aa8,1,...) at kdb_enter+0x3a
panic(c061db9e,0,c061cee6,88e,4,...) at panic+0x136
vrele(c4326d9c,0,c433fb5f,82,c060f3c7,...) at vrele+0x111
null_nodeget(c3fd4780,c4326d9c,c3ba8bf4,0,c3ba8be4,...) at null_nodeget+0xa0
null_bypass(c3ba8be0,c3f35a78,c3ba8c28) at null_bypass+0x141
VOP_VPTOCNP_APV(c4340240,c3ba8be0,c061bf01,387,c3cecc00,...) at
VOP_VPTOCNP_APV+0xb3
vn_vptocnp(c3ba8c4c,c061bf01,3af,c3ba8c3c,c3f35a78,...) at vn_vptocnp+0xd9
vn_fullpath1(c3cecc00,c3ba8c5c,3fc,315,c3cecc00,...) at vn_fullpath1+0x29a
kern___getcwd(c4134000,bfbfe884,0,400,c3ba8d2c,...) at kern___getcwd+0xd0
__getcwd(c4134000,c3ba8cf8,8,c0617c09,c0640290,...) at __getcwd+0x29
syscall(c3ba8d38) at syscall+0x261
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (326, FreeBSD ELF32, __getcwd), eip = 0x2814edfb, esp =
0xbfbfe6cc, ebp = 0xbfbfe788 ---
panic: vrele: negative ref cnt
cpuid = 1
KDB: enter: panic
shared lockmgr ufs (ufs) r = 0 (0xc43c36a0) locked @
/usr/src/sys/kern/vfs_default.c:790
shared lockmgr ufs (ufs) r = 0 (0xc43c36a0) locked @
/usr/src/sys/kern/vfs_default.c:790
0xc43c3648: tag ufs, type VDIR
usecount 1, writecount 0, refcount 1 mountedhere 0
flags ()
lock type ufs: SHARED (count 1)
ino 3583142, on dev ad0s1h
0xc43c3430: tag null, type VDIR
usecount 4, writecount 0, refcount 5 mountedhere 0
flags ()
lock type ufs: SHARED (count 1)
vp=0xc43c3430, lowervp=0xc43c3648
How to reproduce it:
# mount_nullfs /usr/local/src /usr/src
# cd /sys
# whereis something
It appears panic have been introduced after r189488
--
Paul
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