Date: Thu, 18 Apr 2013 10:33:37 +0200 From: Damjan Marion <damjan.marion@gmail.com> To: Andrew Turner <andrew@fubar.geek.nz> Cc: "freebsd-arm@FreeBSD.org" <freebsd-arm@freebsd.org> Subject: Re: __rw_wlock_hard panic on 1st malloc Message-ID: <5BE690EF-486A-482F-A275-35B07D92113E@gmail.com> In-Reply-To: <20130418180818.1d036620@bender> References: <DB4E4AA0-91D8-4253-8044-9C33B60E1A3A@gmail.com> <8DE83B01-4508-41C5-B2BD-95A72D0AD963@bsdimp.com> <BD1AE699-31B2-4F13-8222-BEB90EE0E57E@gmail.com> <B94DB19B-7940-4376-B38B-369FD0E45282@bsdimp.com> <92C60946-8FFB-46A1-9400-9E0F7B11FC23@gmail.com> <9A3C042F-3765-4791-AB51-63EA82488743@bsdimp.com> <20130418113609.5880e469@bender> <0E720F47-E84A-4CC8-8A56-1031AB6DB65A@bsdimp.com> <20130418180818.1d036620@bender>
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On Apr 18, 2013, at 10:08 AM, Andrew Turner <andrew@fubar.geek.nz> =
wrote:
> On Wed, 17 Apr 2013 22:36:29 -0600
> Warner Losh <imp@bsdimp.com> wrote:
>=20
>>=20
>> On Apr 17, 2013, at 7:36 PM, Andrew Turner wrote:
>>=20
>>> On Wed, 17 Apr 2013 09:37:26 -0600
>>> Warner Losh <imp@bsdimp.com> wrote:
>>>=20
>>>> I don't think it is, at least not with clang compiled code. Ian was
>>>> saying on IRC that he saw this and went back to gcc and life was
>>>> good.
>>>=20
>>> I suspect it is an issue with the newer version of clang imported
>>> recently. I have tested with an old version of clang and an updated
>>> kernel and had no issues booting.
>>=20
>> If I take WITNESS out of the kernel, I have no issues either. Not
>> sure what WITNESS' problem is...
>=20
> I've tried with an updated clang on a PandaBoard with WITNESS enabled.
> The only issue I'm hitting is vm_thread_new fails, but this is after
> FreeBSD enters userland which, from you other emails, appears to be
> further than you are getting.
>=20
> I have set unmapped_buf_allowed =3D 0 in sys/arm/arm/pmap-v6.c to work
> around the above stack issue. I don't know if this will fix the issue
> or not but you can try it to see.
Just tried clang + unmapped_buf_allowed=3D0:
Copyright (c) 1992-2013 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights =
reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 10.0-CURRENT #0 r+b594eb9-dirty: Thu Apr 18 09:29:34 CEST 2013
dmarion@vm-freebsd-head:/tmp/WANDBOARD arm
FreeBSD clang version 3.3 (trunk 178860) 20130405
WARNING: WITNESS option enabled, expect reduced performance.
panic: acquiring blockable sleep lock with spinlock or critical section =
held (rw) pmap pv global @ /usr/src/sys/arm/arm/pmap-v6.c:1187
KDB: enter: panic
Damjan=
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