On Sat, Dec 23, 2017 at 02:32:52PM +0100, Thomas Gleixner wrote: > On Sat, 23 Dec 2017, Dexuan Cui wrote: > > > > From: Alexandru Chirvasitu [mailto:achirvasub@xxxxxxxxx] > > > Sent: Friday, December 22, 2017 14:29 > > > > > > The output of that precise command run just now on a freshly-compiled > > > copy of that commit is attached. > > > > > > On Fri, Dec 22, 2017 at 09:31:28PM +0000, Dexuan Cui wrote: > > > > > From: Alexandru Chirvasitu [mailto:achirvasub@xxxxxxxxx] > > > > > Sent: Friday, December 22, 2017 06:21 > > > > > > > > > > In the absence of logs, the best I can do at the moment is attach a > > > > > picture of the screen I am presented with on the apic=debug boot > > > > > attempt. > > > > > Alex > > > > > > > > The panic happens in irq_matrix_assign_system+0x4e/0xd0 in your picture. > > > > IMO we should find which line of code causes the panic. I suppose > > > > "objdump -D kernel/irq/matrix.o" can help to do that. > > > > > > > > Thanks, > > > > -- Dexuan > > > > The BUG_ON panic happens at line 147: > > BUG_ON(!test_and_clear_bit(bit, cm->alloc_map)); > > > > I'm sure Thomas and Dou know it better than me. > > I'll have a look after the holidays. > Thanks for that! A quick follow-up on my inability to make kexec / kdump work in order to perhaps produce better logs: I've done another bisect for that with this result: # first bad commit: [e802a51ede91350438c051da2f238f5e8c918ead] x86/idt: Consolidate IDT invalidation I am quite certain this is the one for that issue. Its only parent is # good: [8f55868f9e42fea56021b17421914b9e4fda4960] x86/idt: Remove unused set_trap_gate() (i.e. one of the "good" commits I hit upon during the bisect). On the core 2 duo machine I've been referring to e802a51 and later commits simply return me to a regular BIOS boot when issuing either kexec -e on a loaded crash kernel or crashing with echo c > /proc/sysrq-trigger. Alex _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
