Date: Mon, 08 Apr 2002 12:33:40 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: David Wolfskill <david@catwhisker.org> Cc: current@freebsd.org, joe@freebsd.org Subject: RE: panic "sleeping without a mutex" in usb_task_thread Message-ID: <XFMail.20020408123340.jhb@FreeBSD.org> In-Reply-To: <200204081558.g38FwmFg049414@bunrab.catwhisker.org>
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On 08-Apr-2002 David Wolfskill wrote:
> On my laptop (but not the build machine; the latter may not have any USB
> devices) I get the following panic after builing, installing, & trying
> to boot -CURRENT from today. (CVSup log below panic trace.)
>
> an0: Ethernet address 00:40:96:32:19:a9
> bpf: an0 attached
> panic: sleeping without a mutex
> Debugger("panic")
> Stopped at Debugger+0x40: xorl %eax,%eax
> db> trace
> Debugger(c03d647c) at Debugger+0x40
> panic(c03d6cac,c021ffec,c8e4e000,c8e4e100,c8e4e000) at panic+0x70
> msleep(c0442d98,0,5c,c03c7784,0) at msleep+0x23
> usb_task_thread(0,c8e6ad48,c8e4e100,c021ffec,0) at usb_task_thread+0x23
> fork_exit(c021ffec,0,c8e6ad48) at fork_exit+0x8c
> fork_trampoline() at fork_trampoline+0x37
> db>show locks
> db>show witness [scrolls off screen]
> db>
>
> [Above was hand-transcribed; I don't have a serial console on my laptop,
> and I'm not running VMware.]
>
> Recent CVSup history:
> freebeast(4.5-S)[1] tail /var/log/cvsup-history.log
> CVSup begin from cvsup14.freebsd.org at Thu Apr 4 03:47:06 PST 2002
> CVSup ended from cvsup14.freebsd.org at Thu Apr 4 03:53:56 PST 2002
> CVSup begin from cvsup14.freebsd.org at Fri Apr 5 03:47:02 PST 2002
> CVSup ended from cvsup14.freebsd.org at Fri Apr 5 03:54:13 PST 2002
> CVSup begin from cvsup14.freebsd.org at Sat Apr 6 03:47:02 PST 2002
> CVSup ended from cvsup14.freebsd.org at Sat Apr 6 03:54:32 PST 2002
> CVSup begin from cvsup14.freebsd.org at Sun Apr 7 03:47:03 PDT 2002
> CVSup ended from cvsup14.freebsd.org at Sun Apr 7 03:53:32 PDT 2002
> CVSup begin from cvsup14.freebsd.org at Mon Apr 8 03:47:02 PDT 2002
> CVSup ended from cvsup14.freebsd.org at Mon Apr 8 03:53:43 PDT 2002
> freebeast(4.5-S)[2]
>
> I can leave it in this condition for a while, if it would be helpful to
> poke around at all.
show witness isn't useful to most people so I would avoid it unless someone
explicitly asks for it. The problem here is likely due to the
usb_task_thread() not locking Giant when it starts up.
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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