Date: Sun, 6 Nov 2016 20:19:21 +0100 From: Michael Tuexen <tuexen@freebsd.org> To: Scott Long <scottl@samsco.org> Cc: Konstantin Belousov <kostikbel@gmail.com>, FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: New warnings from WITNESS Message-ID: <B321569D-89C9-4945-A778-B26CF2AFD7C8@freebsd.org> In-Reply-To: <EDC33B42-DF87-4502-888E-F4EDE3535261@samsco.org> References: <CA9B9B19-5311-4A4E-87ED-8771C1000BEC@freebsd.org> <20161106122802.GA54029@kib.kiev.ua> <A89EC552-F99B-42C1-9990-8937E08A69A6@freebsd.org> <20161106143908.GE54029@kib.kiev.ua> <E7BE730E-774D-426E-950F-E936A2456200@freebsd.org> <EDC33B42-DF87-4502-888E-F4EDE3535261@samsco.org>
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> On 6 Nov 2016, at 19:41, Scott Long <scottl@samsco.org> wrote: >=20 >=20 >> On Nov 6, 2016, at 11:01 AM, Michael Tuexen <tuexen@FreeBSD.org> = wrote: >>=20 >>> On 6 Nov 2016, at 15:39, Konstantin Belousov <kostikbel@gmail.com> = wrote: >>>=20 >>> On Sun, Nov 06, 2016 at 02:17:45PM +0100, Michael Tuexen wrote: >>>>> On 6 Nov 2016, at 13:28, Konstantin Belousov <kostikbel@gmail.com> = wrote: >>>>>=20 >>>>> On Sun, Nov 06, 2016 at 12:50:12PM +0100, Michael Tuexen wrote: >>>>>> bus_dmamap_create with the following non-sleepable locks held: >>>>>> exclusive sleep mutex mpt (mpt) r =3D 0 (0xfffffe0000e2f008) = locked @ dev/mpt/mpt.c:2287 >>>>>> stack backtrace: >>>>>> #0 0xffffffff80ac0300 at witness_debugger+0x70 >>>>>> #1 0xffffffff80ac15e7 at witness_warn+0x3d7 >>>>>> #2 0xffffffff81055fef at bus_dmamap_create+0x2f >>>>>> #3 0xffffffff80678a25 at mpt_configure_ioc+0x3a5 >>>>>> #4 0xffffffff80677476 at mpt_attach+0x226 >>>>>> #5 0xffffffff80683299 at mpt_pci_attach+0x9c9 >>>>>> #6 0xffffffff80a9478d at device_attach+0x41d >>>>>> #7 0xffffffff80a9595a at bus_generic_attach+0x4a >>>>>> #8 0xffffffff806ebe75 at pci_attach+0xd5 >>>>>> #9 0xffffffff80a9478d at device_attach+0x41d >>>>>> #10 0xffffffff80a9595a at bus_generic_attach+0x4a >>>>>> #11 0xffffffff803c11a2 at acpi_pcib_acpi_attach+0x402 >>>>>> #12 0xffffffff80a9478d at device_attach+0x41d >>>>>> #13 0xffffffff80a9595a at bus_generic_attach+0x4a >>>>>> #14 0xffffffff803b4c8f at acpi_attach+0xdbf >>>>>> #15 0xffffffff80a9478d at device_attach+0x41d >>>>>> #16 0xffffffff80a9595a at bus_generic_attach+0x4a >>>>>> #17 0xffffffff80ee03e3 at nexus_acpi_attach+0x73 >>>>>>=20 >>>>>> ... and so on. Not sure which revision introduced it... >>>>> r308268 >>>>>=20 >>>>> I believe that this is an mpt(4) driver issue, which calls >>>>> bus_dmamap_create(9) with the mpt mutex held. >>>> OK. Whom to contact? Or are you willing to look into it? >>>> I haven't worked in that area... >>>=20 >>> I am really not sure. Looking at the svn history is not very = encouraging. >> Hmm. Time to change my setup, I guess... >>>=20 >>> Might be try freebsd-scsi@ as well. >> I dropped them an e-mail... >>=20 >>=20 >=20 > Please see my response on that list. Will do once it shows up in the archive since I'm not subscribed to that list... Best regards Michael >=20 > Scott >=20 >=20
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