Date: Tue, 16 Apr 2013 16:43:41 -0600 From: Warner Losh <imp@bsdimp.com> To: Damjan Marion <damjan.marion@gmail.com> Cc: "freebsd-arm@FreeBSD.org" <freebsd-arm@freebsd.org> Subject: Re: __rw_wlock_hard panic on 1st malloc Message-ID: <B94DB19B-7940-4376-B38B-369FD0E45282@bsdimp.com> In-Reply-To: <BD1AE699-31B2-4F13-8222-BEB90EE0E57E@gmail.com> References: <DB4E4AA0-91D8-4253-8044-9C33B60E1A3A@gmail.com> <8DE83B01-4508-41C5-B2BD-95A72D0AD963@bsdimp.com> <BD1AE699-31B2-4F13-8222-BEB90EE0E57E@gmail.com>
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The problem here is a double fault. The first fault is in = init_dynamic_kenv when we try to read the kernel environment. The second = fault happens because we don't wind up in the debugger (I think due to = reading the stack goes awry). I've fixed the first problem in r249570. Not sure what's going on beyond that, since after fixing that I hit a = similar issue in stack_copy() but without a traceback, it is kinda hard. This is on my MarsBoard with an allwinner tech's A10 CPU. Warner On Apr 14, 2013, at 12:51 PM, Damjan Marion wrote: >=20 > I doubt. init_dynamic_kenv() is called by sysinit as part of standard = sysinit sequence and=20 > it is called after kmeminit(). >=20 > There is no my custom code except standard parts of initarm = initialisation. >=20 > Damjan >=20 > On Apr 14, 2013, at 7:19 PM, Warner Losh <imp@bsdimp.com> wrote: >=20 >> Maybe you are calling malloc before these locks are initialized? >>=20 >> Warner >>=20 >> On Apr 14, 2013, at 5:03 AM, Damjan Marion wrote: >>=20 >>>=20 >>> Hi, >>>=20 >>> I'm playing a bit with i.MX6 based board (wandboard) and I have = serial console working but >>> now it panics in init_dynamic_kenv() with the following error: >>>=20 >>> panic: __rw_wlock_hard: recursing but non-recursive rw pmap pv = global @ /usr/src/sys/arm/arm/pmap-v6.c:1187 >>>=20 >>> It looks like this is the 1st place where malloc() is called, an = malloc returns valid VA >>> but 1st attempt to access that address produces panic above. >>>=20 >>> Any idea what can be the reason for this or any other hint? >>>=20 >>> Thanks, >>>=20 >>> Damjan >>> _______________________________________________ >>> freebsd-arm@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-arm >>> To unsubscribe, send any mail to = "freebsd-arm-unsubscribe@freebsd.org" >>=20 >=20
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