Date: Tue, 1 Feb 2005 02:58:59 -0800 From: "Li, Qing" <qing.li@bluecoat.com> To: <freebsd-current@freebsd.org> Subject: question on lock error Message-ID: <00CDF9AA240E204FA6E923BD35BC643608503A1A@bcs-mail.internal.cacheflow.com>
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In my file if_llatbl.c, the entry and exit of function sysctl_dumparp is=20 guarded with IFNET_RLOCK() <<---- line 128 ... IFNET_RUNLOCK() dump_llcache is also my code. The modified "arp" and "ndp" commands will trigger the following messages, however, the output of the new L2/L3 cache table is correct. But later on a=20 userland application will get EPERM error. I think this is related to the=20 lock error. Could someone who is knowledgeable in the locking scheme give me a=20 pointer here, please ? TIA -- Qing Feb 1 10:02:19 heavygear kernel: --- syscall (202, FreeBSD ELF32, __sysctl), eip =3D 0x280b8ba3, esp =3D 0xbfbfe9bc, ebp =3D 0xbfbfe9f8 = --- Feb 1 10:02:19 heavygear kernel: sysctl_old_user() with the following non-sleepable locks held: Feb 1 10:02:19 heavygear kernel: exclusive sleep mutex ifnet r =3D 0 (0xc094bba0) locked @ /usr/src/sys/net/if_llatbl.c:128 Feb 1 10:02:19 heavygear kernel: KDB: stack backtrace: Feb 1 10:02:19 heavygear kernel: kdb_backtrace(1,1,1,b0,e4b7bc04) at kdb_backtrace+0x29 Feb 1 10:02:19 heavygear kernel: witness_warn(5,0,c0834d13) at witness_warn+0x19a Feb 1 10:02:19 heavygear kernel: sysctl_old_user(e4b7bc04,e4b7b9ec,b0,b0,e4b7b9ec) at sysctl_old_user+0x3d Feb 1 10:02:19 heavygear kernel: dump_llcache(c1fd842c,1c,c1fffd28,e4b7bc04,0) at dump_llcache+0x19e Feb 1 10:02:19 heavygear kernel: sysctl_dumparp(1c,e4b7bc04,1c0000bc,0,2) at sysctl_dumparp+0x5e Feb 1 10:02:19 heavygear kernel: sysctl_rtsock(c08a20c0,e4b7bc8c,4,e4b7bc04,c08a20c0) at sysctl_rtsock+0x10a Feb 1 10:02:19 heavygear kernel: sysctl_root(0,e4b7bc84,6,e4b7bc04,c247e450) at sysctl_root+0x11b Feb 1 10:02:19 heavygear kernel: userland_sysctl(c247e450,e4b7bc84,6,804f000,bfbfea7c) at userland_sysctl+0xf4 Feb 1 10:02:19 heavygear kernel: __sysctl(c247e450,e4b7bd14,6,1,10296) at __sysctl+0x77 Feb 1 10:02:19 heavygear kernel: syscall(2f,2f,2f,6,bfbfea7c) at syscall+0x213 Feb 1 10:02:19 heavygear kernel: Xint0x80_syscall() at Xint0x80_syscall+0x1f
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