Messages in this thread |  | | | Date | Thu, 27 Aug 2009 21:05:32 -0700 (PDT) | | From | Linus Torvalds <> | | Subject | Re: [BUG] lockup with the latest kernel |
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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.
Linus
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