Date: Mon, 21 Oct 2002 17:04:57 -0700 From: Lars Eggert <larse@ISI.EDU> To: current <current@FreeBSD.ORG> Subject: yet another lock order reversal Message-ID: <3DB49629.4090302@isi.edu>
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lock order reversal
1st 0xc791bc00 pipe mutex (pipe mutex) @ /usr/src/sys/kern/sys_pipe.c:465
2nd 0xc04974e0 sigio lock (sigio lock) @ /usr/src/sys/kern/kern_sig.c:2156
Debugger("witness_lock")
Stopped at Debugger+0x5a: xchgl %ebx,in_Debugger.0
db> trace
Debugger(c0440ebb,c04974e0,c043af10,c043af10,c043dc59) at Debugger+0x5a
witness_lock(c04974e0,8,c043dc59,86c,eb68bbe8) at witness_lock+0x142
_mtx_lock_flags(c04974e0,0,c043dc59,86c,c029a151) at _mtx_lock_flags+0x63
pgsigio(c7d13ae8,17,0,1ad,0) at pgsigio+0x2d
pipe_read(c75a4b04,eb68bc78,c76e6b00,0,c6d24b60) at pipe_read+0x290
dofileread(c6d24b60,c75a4b04,3,bfbfb837,1) at dofileread+0xd7
read(c6d24b60,eb68bd10,c0464b1d,42d,c6d23e68) at read+0x7b
syscall(2f,2f,2f,2811ba2b,bfbfb850) at syscall+0x406
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (3, FreeBSD ELF32, read), eip = 0x281666b3, esp =
0xbfbfb81c, ebp = 0xbfbfb878 ---
Lars
--
Lars Eggert <larse@isi.edu> USC Information Sciences Institute
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