Date: Tue, 18 Dec 2007 14:43:12 -0500 From: Ed Maste <emaste@freebsd.org> To: freebsd-current@freebsd.org Cc: bzeeb+freebsd+lor@zabbadoz.net Subject: LOR kqueue / sleep mtxpool for LOR list Message-ID: <20071218194312.GB40055@sandvine.com>
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I just saw this LOR during startup of an application while testing 8-CURRENT on a dev box. I've done no investigation yet. FreeBSD TPC-D13-08.phaedrus 8.0-CURRENT FreeBSD 8.0-CURRENT #0: Mon Dec 17 16:27:54 EST 2007 emaste@bsd-build3.phaedrus:/d2/emaste/HEAD/obj/d2/emaste/HEAD/src/sys/GENERIC i386 lock order reversal: 1st 0xc42b7580 kqueue (kqueue) @ /d2/emaste/HEAD/src/sys/kern/kern_event.c:1397 2nd 0xc3ece8e0 sleep mtxpool (sleep mtxpool) @ /d2/emaste/HEAD/src/sys/kern/sys_generic.c:1255 KDB: stack backtrace: db_trace_self_wrapper(c0b08871,e683aaa4,c079cafe,c0b0ade3,c3ece8e0,...) at db_trace_self_wrapper+0x26 kdb_backtrace(c0b0ade3,c3ece8e0,c0b043d7,c0b043d7,c0b0b09a,...) at kdb_backtrace+0x29 witness_checkorder(c3ece8e0,9,c0b0b09a,4e7,c42b7580,...) at witness_checkorder+0x6de _mtx_lock_flags(c3ece8e0,0,c0b0b09a,4e7,40,...) at _mtx_lock_flags+0xbc selrecord(c4474220,c42b75ac,c0b01a8d,575,c42b7580,...) at selrecord+0x9d kqueue_poll(c4341cf0,40,c46f4000,c4474220,e683ab74,...) at kqueue_poll+0x65 poll(c4474220,e683acfc,c,e683ad38,c0bb84b8,...) at poll+0x2cc syscall(e683ad38) at syscall+0x2b3 Xint0x80_syscall() at Xint0x80_syscall+0x20 --- syscall (209, FreeBSD ELF32, poll), eip = 0x287451db, esp = 0x8672f3c, ebp = 0x8672f98 --- -Ed
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