Linus Torvalds wrote (ao): > On Tue, 21 Mar 2006, Sander wrote: > > The system just freezes. Rock solid. No sysrq, no ctrl-alt-del, nothing. > > Can you enable the NMI watchdog? It could be a PCI bus lockup (in which > case nothing will help), but if it's some interrupts-off busy loop > (whether due to a spinlock deadlock or due to the driver just spinning) > then nmi-watchdog should help. > > Of course, that requires that you have support for local/io-APIC (ie if > UP, please select CONFIG_X86_UP_.*APIC) The kernel is compiled for x86-64 and SMP (dual core opteron), so if I understand the NMI watchdog documentation correctly, it is automagically enabled. # dmesg | grep -i nmi [ 0.000000] ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1]) [ 0.000000] ACPI: LAPIC_NMI (acpi_id[0x01] high edge lint[0x1]) [ 75.280604] testing NMI watchdog ... OK. # grep -i nmi /proc/interrupts NMI: 52 43 (seems to increment _very_ slowly). Is there anything else I can do to see some crash info? Btw, it always seems to crash during the md5sum of this test: for i in `seq 4` do dd if=/dev/zero of=bigfile.$i bs=1024k count=10000 dd if=bigfile.$i of=/dev/null bs=1024k count=10000 done time md5sum bigfile.* time rm bigfile.* One time during many tests I needed to run this twice before it went bellyup. I was not able to let 2.6.16-rc6-mm2 crash yet. I'll test 2.6.16-rc6-mm1 now. -- Humilis IT Services and Solutions http://www.humilis.net - : send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
