Date: Mon, 21 Oct 2002 16:53:21 -0700 From: Lars Eggert <larse@ISI.EDU> To: current <current@FreeBSD.ORG> Subject: another lock order reversal Message-ID: <3DB49371.5060900@isi.edu>
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lock order reversal
1st 0xc6f47a68 vnode interlock (vnode interlock) @
/usr/src/sys/nfsclient/nfs_vnops.c:2629
2nd 0xc04b8640 vm page queue mutex (vm page queue mutex) @
/usr/src/sys/vm/vm_kern.c:424
Debugger("witness_lock")
Stopped at Debugger+0x5a: xchgl %ebx,in_Debugger.0
db> trace
Debugger(c0440ebb,c04b8640,c045b97b,c045b97b,c045a890) at Debugger+0x5a
witness_lock(c04b8640,8,c045a890,1a8,666a) at witness_lock+0x142
_mtx_lock_flags(c04b8640,0,c045a890,1a8,c6569000) at _mtx_lock_flags+0x63
kmem_malloc(c0832078,1000,1,1,c2389624) at kmem_malloc+0x2cf
slab_zalloc(c2389600,1,c6e48000,5c2,c043cc46) at slab_zalloc+0xbd
uma_zalloc_internal(c2389600,0,1,c23b3a00,0) at uma_zalloc_internal+0x28e
uma_zalloc_arg(c2389600,0,1,c026b13c,c2389600) at uma_zalloc_arg+0x26c
malloc(dcc,c0498920,1,a45,c04e8398) at malloc+0x75
nfs_flush(c6f47a68,c7444f00,1,c67d6ea0,1) at nfs_flush+0x8b4
nfs_fsync(eb5b7840,0,c0445ac2,449,200246) at nfs_fsync+0x31
vinvalbuf(c6f47a68,1,c7444f00,c67d6ea0,100) at vinvalbuf+0x380
nfs_vinvalbuf(c6f47a68,1,c7444f00,c67d6ea0,1) at nfs_vinvalbuf+0x16d
nfs_open(eb5b79c8,c04e9018,eb5b79ac,100,c67d6ea0) at nfs_open+0x7e
vn_open_cred(eb5b7bd4,eb5b7cd4,0,c7444f00,eb5b7cc0) at vn_open_cred+0x306
vn_open(eb5b7bd4,eb5b7cd4,0,28f,c04e8398) at vn_open+0x29
kern_open(c67d6ea0,89e2000,0,1,0) at kern_open+0x197
open(c67d6ea0,eb5b7d10,c0464b1d,42d,c6b7c3e8) at open+0x30
syscall(2f,2f,bfa8002f,4,28d97998) at syscall+0x406
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (5, FreeBSD ELF32, open), eip = 0x28d11673, esp =
0xbfa87cfc, ebp = 0xbfa87d18 ---
Lars
--
Lars Eggert <larse@isi.edu> USC Information Sciences Institute
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