Date: Sun, 22 Aug 1999 21:34:21 -0500 From: Alan Cox <alc@cs.rice.edu> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Luoqi Chen <luoqi@watermarkgroup.com>, freebsd-smp@FreeBSD.ORG Subject: Re: Weird infinite lockup in splx() (in IFCPL_UNLOCK) w/ latest CURRENT/SMP Message-ID: <19990822213421.E47586@nonpc.cs.rice.edu> In-Reply-To: <199908230023.RAA00824@apollo.backplane.com>; from Matthew Dillon on Sun, Aug 22, 1999 at 05:23:40PM -0700 References: <199908230023.RAA00824@apollo.backplane.com>
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On Sun, Aug 22, 1999 at 05:23:40PM -0700, Matthew Dillon wrote: > I had a weird lockup w/ the latest CURRENT while doing an installworld. > > I tracked the lockup down to an infinite loop in the current process... > an infinite loop in splx()! > > I've never had this lockup before so I believe it to be due to > some recent change. The lockup occured during very heavy use of > the lockmgr on the same vnode lock (the uudecode binary) during a > parallel installworld. > > My kernel was as of today, 22Aug. This is on a 2xPIII/450 SMP box. > > I believe there to be a race condition somewhere. > > -Matt > > ... > #9 0xc021f1e6 in scgetc (sc=0xc02a37e0, flags=2) > at ../../dev/syscons/syscons.c:3782 > #10 0xc021aef1 in sckbdevent (thiskbd=0xc02b4d20, event=0, arg=0xc02a37e0) > at ../../dev/syscons/syscons.c:663 > #11 0xc021481f in atkbd_intr (kbd=0xc02b4d20, arg=0x0) > at ../../dev/kbd/atkbd.c:439 > #12 0xc024b764 in atkbd_isa_intr (arg=0xc02b4d20) at ../../isa/atkbd_isa.c:123 > #13 0xc0243194 in splx (ipl=3224034576) at ../../i386/isa/ipl_funcs.c:275 > > ^^^^^^^ it was looping splx, in IFCPL_UNLOCK. > Are you sure about this? There's no loop in IFCPL_UNLOCK or splx (proper) for that matter. Only the IFCPL_LOCK at the beginning and the splz at the end contain loops within them. > #14 0xc014c158 in lockmgr (lkp=0xc02add10, flags=2, interlkp=0x0, p=0xcc745ec0) > at ../../kern/kern_lock.c:360 > #15 0xc0205513 in kmem_alloc_wait (map=0xc02add10, size=69632) > at ../../vm/vm_kern.c:436 > #16 0xc0149375 in execve (p=0xcc745ec0, uap=0xcc7a3f80) > at ../../kern/kern_exec.c:126 > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-smp" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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