Messages in this thread |  | | | Date | Fri, 28 Aug 2009 12:15:49 -0400 (EDT) | | From | Steven Rostedt <> | | Subject | Re: [BUG] lockup with the latest kernel |
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On Thu, 27 Aug 2009, Linus Torvalds wrote:
> > > On Fri, 28 Aug 2009, Tejun Heo wrote: > > > > > > x86: make x86_32 use tlb_64.c > > > > > > Impact: less contention when issuing invalidate IPI, cleanup > > > > > > Make x86_32 use the same tlb code as 64bit. The 64bit code uses > > > multiple IPI vectors for tlb shootdown to reduce contention. This > > > patch makes x86_32 allocate the same 8 IPIs as x86_64 and share the > > > code paths. > > > > > > Note that the usage of asmlinkage is inconsistent for x86_32 and 64 > > > and calls for further cleanup. This has been noted with a FIXME > > > comment in tlb_64.c. > > > > > > Signed-off-by: Tejun Heo <tj@kernel.org> > > > > > > I can easily hit this bug at this commit, but I ran for a week on the > > > commit before it. Thus I'm assuming this is the bug (but I'm not 100% > > > sure). > > > > Drat, why does it have to be mine? ;-) > > > > Joke aside, thank you very much for bisecting it. > > > > ... > > >> [13288.222084] EIP: 0060:[<c0110821>] EFLAGS: 00000002 CPU: 0 > > >> [13288.222084] EIP is at default_send_IPI_mask_logical+0x53/0x92 > > Is this one perhaps fixed by b04e6373d694 ("x86: don't call > '->send_IPI_mask()' with an empty mask") > > It sounds a _lot_ like that bug. Older dual-cpu x86 box, and APIC getting > confused by the occasional empty CPU mask, and then subsequent IPI's will > hang.
I'll update my box to that kernel and see what happens and let you know.
Thanks,
-- Steve
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