Date: Sun, 6 Nov 2016 14:28:02 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Michael Tuexen <tuexen@freebsd.org> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: New warnings from WITNESS Message-ID: <20161106122802.GA54029@kib.kiev.ua> In-Reply-To: <CA9B9B19-5311-4A4E-87ED-8771C1000BEC@freebsd.org> References: <CA9B9B19-5311-4A4E-87ED-8771C1000BEC@freebsd.org>
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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 = 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 > > ... and so on. Not sure which revision introduced it... r308268 I believe that this is an mpt(4) driver issue, which calls bus_dmamap_create(9) with the mpt mutex held.
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