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SubjectRe: Kernel panic with intel_iommu=on
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I'm seeing this all of a sudden on 3.1 kernels.  It might be because of
the firefox upgrade to 5.0 that others were talking about. But, it's
quite easy to trigger. Seems to happen in the first 10 minutes of using
the system. I was only able to capture this with netconsole.

I'll try with intel_iommu=igfx_off as well.

[ 853.140884] Kernel panic - not syncing: DMAR hardware is malfunctioning
[ 853.140888]
[ 853.147860] Pid: 2053, comm: Xorg Not tainted 3.1.0-rc9-00064-g65112dc #12
[ 853.151513] Call Trace:
[ 853.155076] <IRQ> [<ffffffff81533c57>] panic+0x9b/0x1a0
[ 853.158666] [<ffffffff8141e648>] __iommu_flush_iotlb+0x14a/0x1b6
[ 853.162255] [<ffffffff81420148>] flush_unmaps+0x6f/0x10e
[ 853.165826] [<ffffffff81420204>] flush_unmaps_timeout+0x1d/0x30
[ 853.169409] [<ffffffff81039444>] run_timer_softirq+0x156/0x1e8
[ 853.172944] [<ffffffff814201e7>] ? flush_unmaps+0x10e/0x10e
[ 853.176467] [<ffffffff8103401c>] __do_softirq+0x85/0x10f
[ 853.179947] [<ffffffff8153826c>] call_softirq+0x1c/0x30
[ 853.183426] [<ffffffff8100368e>] do_softirq+0x33/0x69
[ 853.186892] [<ffffffff810342c1>] irq_exit+0x43/0x6c
[ 853.190369] [<ffffffff81017680>] smp_apic_timer_interrupt+0x86/0x94
[ 853.193838] [<ffffffff8153780b>] apic_timer_interrupt+0x6b/0x70
[ 853.197266] <EOI> [<ffffffff81536d7b>] ? system_call_fastpath+0x16/0x1b
[ 854.262146] panic occurred, switching back to text console

relevant portions of dmesg:

[ 0.000000] ACPI: TCPA 00000000bb78b000 00032 (v02 PTL CRESTLN 06040000 00005A52)
[ 0.000000] ACPI: DMAR 00000000bb781000 000B8 (v01 INTEL CP_DALE 00000001 INTL 00000001)
[ 0.000000] ACPI: SSDT 00000000bb779000 009F1 (v01 PmRef CpuPm 00003000 INTL 20061109)
--
[ 0.027047] ftrace: allocating 24328 entries in 96 pages
[ 0.033746] DMAR: Host address width 36
[ 0.033811] DMAR: DRHD base: 0x000000fed90000 flags: 0x0
[ 0.033882] IOMMU 0: reg_base_addr fed90000 ver 1:0 cap c9008020e30272 ecap 1000
[ 0.033981] DMAR: DRHD base: 0x000000fed91000 flags: 0x0
[ 0.034053] IOMMU 1: reg_base_addr fed91000 ver 1:0 cap c0000020230272 ecap 1000
[ 0.034162] DMAR: DRHD base: 0x000000fed93000 flags: 0x1
[ 0.034233] IOMMU 2: reg_base_addr fed93000 ver 1:0 cap c9008020630272 ecap 1000
[ 0.034331] DMAR: RMRR base: 0x000000bb6e9000 end: 0x000000bb6fffff
[ 0.034401] DMAR: RMRR base: 0x000000bdc00000 end: 0x000000bfffffff
[ 0.034471] DMAR: No ATSR found
[ 0.034659] Setting APIC routing to flat



-- Dave



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