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[Bug 1291113] [NEW] Intel igb driver infinite loop in ksoftirqd, uses 100% of cpu 0


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This bug is present in 3.11.0-17 and 3.11.0-18:


The afflicted network interface's lspci output:

02:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network Connection (rev 01)
	Subsystem: Super Micro Computer Inc Device 1521
	Flags: bus master, fast devsel, latency 0, IRQ 27
	Memory at df920000 (32-bit, non-prefetchable) [size=128K]
	I/O ports at 8020 [size=32]
	Memory at df944000 (32-bit, non-prefetchable) [size=16K]
	Capabilities: [40] Power Management version 3
	Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
	Capabilities: [70] MSI-X: Enable+ Count=10 Masked-
	Capabilities: [a0] Express Endpoint, MSI 00
	Capabilities: [100] Advanced Error Reporting
	Capabilities: [140] Device Serial Number 00-xx-xx-xx-xx-xx-xx-xx
	Capabilities: [150] Alternative Routing-ID Interpretation (ARI)
	Capabilities: [160] Single Root I/O Virtualization (SR-IOV)
	Capabilities: [1a0] Transaction Processing Hints
	Capabilities: [1c0] Latency Tolerance Reporting
	Capabilities: [1d0] Access Control Services
	Kernel driver in use: igb
	Kernel modules: igb

[I have masked out the MAC address]

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

Intel igb driver infinite loop in ksoftirqd, uses 100% of cpu 0
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