Ok, I think I found the problem.
In the BIOS settings, neither ACPI nor ACPI APIC were enabled.
Enabling ACPI caused the system not to boot, due to bug 11941 I think, so I let
it disabled.
I enabled the flag ACPI APIC and did some stress tests... now the system
doesn't hang anymore.
The file /proc/interrupts now reads as follows:
CPU0
0: 185 IO-APIC-edge timer
1: 1334 IO-APIC-edge i8042
8: 0 IO-APIC-edge rtc0
9: 0 IO-APIC-fasteoi acpi
12: 36697 IO-APIC-edge i8042
14: 50498 IO-APIC-edge pata_via
15: 20757 IO-APIC-edge pata_via
16: 451867 IO-APIC-fasteoi sata_via, m...@pci:0000:01:00.0
17: 0 IO-APIC-fasteoi uhci_hcd:usb3
18: 457336 IO-APIC-fasteoi sata_via, uhci_hcd:usb4
19: 587316 IO-APIC-fasteoi sata_via, ehci_hcd:usb1
20: 0 IO-APIC-fasteoi sata_via
21: 5658 IO-APIC-fasteoi ehci_hcd:usb2, uhci_hcd:usb5,
uhci_hcd:usb6, uhci_hcd:usb7, uhci_hcd:usb8
22: 2240 IO-APIC-fasteoi VIA8237
23: 2688052 IO-APIC-fasteoi eth0
NMI: 0 Non-maskable interrupts
LOC: 288082 Local timer interrupts
RES: 0 Rescheduling interrupts
CAL: 0 Function call interrupts
TLB: 0 TLB shootdowns
SPU: 0 Spurious interrupts
ERR: 0
MIS: 0
Quite different from the previous one :-)
So in the end the problem seems to be caused by not having enabled the
IO-APIC in the BIOS settings.
--
system hangs when reading from multiple VT6421 PCI sata cards
https://bugs.launchpad.net/bugs/398392
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