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Subject: Re: New warnings from WITNESS
From: Michael Tuexen <tuexen@freebsd.org>
In-Reply-To: <20161106122802.GA54029@kib.kiev.ua>
Date: Sun, 6 Nov 2016 14:17:45 +0100
Cc: FreeBSD Current <freebsd-current@freebsd.org>
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References: <CA9B9B19-5311-4A4E-87ED-8771C1000BEC@freebsd.org>
 <20161106122802.GA54029@kib.kiev.ua>
To: Konstantin Belousov <kostikbel@gmail.com>
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> 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...

Best regards
Michael