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Message-ID: <CAKSCDraxo81GPNekpEr-G5QX-9evum4r2-xjZAkXqeNXb9REow@mail.gmail.com> Date: Sat, 21 Feb 2015 13:15:10 +0200 From: Tal Abudi <talabudi@...il.com> To: linux-kernel@...r.kernel.org Subject: genirq - interrupt during MSI creation hangs the machine Hi All I'm back-porting the genirq patch series to my Linux 2.6.18. After insmod'ing ixgbe driver with MQ enabled my machine hangs and I'm unable to enter KDB. I instrumented the MSIX and ixgbe drivers and found something strange. The driver calls pci_enable_msix(with 41 vectors) -> msix_capability_init() creates allocates msi descriptors and assign each an IRQ. An interrupt request occurs on IRQ 86 on a different CPU while it's being created and handle_edge_irq() is being called. The IRQ_DISABLED flag is set so the edge handle masks and acks the interupt. This sometimes hand the machine and sometimes BUG_ON it. (mask_MSI_irq() -> msi_set_mask_bit(), is null since we are in the middle of msi creation process). This issue only happens when I load the driver with more than 1 MQ interfaces (nvec is >2 in those cases). Which mechanism should prevent this situations ? Why it always happens on the same IRQ ? Did I miss any genirq patch ? Thank you so much ! -- Best regards, Tal Abudi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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