nmi_watchdog=1 hangs on 64-bit:
[ 0.250000] Detected 12.564 MHz APIC timer.
[ 0.254178] APIC timer registered as dummy, due to nmi_watchdog=1!
[ 0.260366] Testing NMI watchdog ... <4>WARNING: CPU#0: NMI appears to be stuck (0->0)!
[ ... ]
[ 0.470003] calling genl_init+0x0/0xd0
[ hard hang ]
bisected it down to:
git-bisect start
git-bisect good 1beee8dc8c
git-bisect bad 11582ece0aaa2d0f94f345c08a4ab9997078a083
git-bisect bad 5479c623bb44089844022c03d4c0eb16d5b7a15f
git-bisect bad cfb4c7fabeb499e1c29f9d1878968e37a938e28a
git-bisect good 246dd412d3
git-bisect bad 3f8237eaff7dc1e35fa791dae095574fd974e671
git-bisect good 90e23b13ab849e2a11f00c655eb3a2011b4623be
git-bisect bad 833526a34eeefc117df3191a594c3c3a4f15a9ac
git-bisect good 791b93d3dfaf16c23e978bec0cc0a3dd9d855d63
git-bisect bad 65767c64068f2c93e56a1accfed5c78230ac12d7
git-bisect bad 2abc5c05dd82c188e3bdf6641a274f013348d14b
git-bisect bad 317e1f2597ffb4d4db940577bbe56dc6e881ef07
| 317e1f2597ffb4d4db940577bbe56dc6e881ef07 is first bad commit
| commit 317e1f2597ffb4d4db940577bbe56dc6e881ef07
| Author: Maciej W. Rozycki <macro@linux-mips.org>
| Date: Wed May 21 22:10:22 2008 +0100
| x86: I/O APIC: clean up the 8259A on a NMI watchdog failure
the problem is that in the dummy-lapic branch we rely on the i8259A
but if the NMI watchdog fails we turn off IRQ 0 - which doesnt work
too well ;-)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
ff11571b25