Date: Tue, 17 Dec 2002 01:02:19 -0500 From: Brent Verner <brent@rcfile.org> To: Alfred Perlstein <alfred@FreeBSD.ORG> Cc: Lars Eggert <larse@ISI.EDU>, Kris Kennaway <kris@obsecurity.org>, current@FreeBSD.ORG, tanimura@FreeBSD.ORG Subject: Re: Lock order reversals in sys_pipe.c and kern_sig.c Message-ID: <20021217060219.GA16356@rcfile.org> In-Reply-To: <20021204231245.GH58155@elvis.mu.org> References: <20021118190819.GK12906@rot13.obsecurity.org> <20021118193901.GA16066@elvis.mu.org> <3DEE8996.70602@isi.edu> <20021204231245.GH58155@elvis.mu.org>
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[2002-12-04 15:12] Alfred Perlstein said:
| * Lars Eggert <larse@ISI.EDU> [021204 15:04] wrote:
| >
| > FYI, just got a similar one yesterday on an up-to-date -current:
| >
| > lock order reversal
| > 1st 0xc784d700 pipe mutex (pipe mutex) @ /usr/src/sys/kern/sys_pipe.c:465
| > 2nd 0xc0513840 sigio lock (sigio lock) @ /usr/src/sys/kern/kern_sig.c:2225
|
| Since no one has given me the traceback based on the patch I posted
| earlier I have ceased to care about the "problem". If someone
| seriously cares they will run with my patch and post a backtrace.
Running java _always_ causes one lock order warning -- and only one,
AFAICT, after having the system up for a few days; successive execs
of the java binary do not cause the warning.
thanks
brent
brent@scratch$ uname -a
FreeBSD scratch.rcfile.org 5.0-CURRENT FreeBSD 5.0-CURRENT #15: Mon Dec 16 23:22:55 EST 2002 root@scratch.rcfile.org:/usr/obj/usr/src/sys/SCRATCH i386
brent@scratch$ javavm -version
lock order reversal
1st 0xc504b280 pipe mutex (pipe mutex) @ /usr/src/sys/kern/sys_pipe.c:465
2nd 0xc051d660 sigio lock (sigio lock) @ /usr/src/sys/kern/kern_sig.c:2225
Debugger("witness_lock")
Stopped at Debugger+0x54: xchgl %ebx,in_Debugger.0
db> trace
Debugger(c0494b35,c051d660,c04cb89d,c04cb89d,c04ce124) at Debugger+0x54
witness_lock(c051d660,8,c04ce124,8b1,c504b280) at witness_lock+0x667
_mtx_lock_flags(c051d660,0,c04ce124,8b1,c4f29d10) at _mtx_lock_flags+0xb1
pgsigio(c4f29da8,17,0,1ad,c0598898) at pgsigio+0x30
pipe_read(c4f21690,e0297c7c,c52a7200,0,c4de0c40) at pipe_read+0x596
dofileread(c4de0c40,c4f21690,3,bfbff0a7,1) at dofileread+0xd2
read(c4de0c40,e0297d10,c04e77be,407,3) at read+0x6b
syscall(2f,2f,2f,281d9c02,bfbff0c0) at syscall+0x28e
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (3, FreeBSD ELF32, read), eip = 0x280c6993, esp = 0xbfbff08c, ebp =
0xbfbff0e8 ---
db> continue
java version "1.3.1-p7"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-p7-root-021107-04:35)
Classic VM (build 1.3.1-p7-root-021107-04:35, green threads, nojit)
brent@scratch$
--
"Develop your talent, man, and leave the world something. Records are
really gifts from people. To think that an artist would love you enough
to share his music with anyone is a beautiful thing." -- Duane Allman
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