Messages in this thread | | | Date | Mon, 07 Apr 2014 20:16:24 +0200 | From | Toralf Förster <> | Subject | Re: Bisected KVM hang on x86-32 between v3.12 and v3.13 |
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On 04/07/2014 05:07 PM, Peter Zijlstra wrote: > On Mon, Apr 07, 2014 at 05:03:37PM +0200, Peter Zijlstra wrote: >> So what I suspect at this point is that because i386 and x86_64 >> have a difference in current_thread_info() (i386 is stack based), >> we end up setting the TIF_NEED_RESCHED bit on the wrong stack. >> >> Now I have some vague memories of propagating the TIF flags on >> stack switch, but I cannot remember what arch we did that for. >> Let me stare at this a little more. >> >> Also, IFF this is the case, then the fingered patch above (and >> your suggested 'fix') aren't the real curlpit/cure but simply >> make it more/less likely to happen. >> >> Now, Steve had a patch somewhere that would make i386 use >> per-cpu variables for current_thread_info() just like x86_64 >> already does I think. Let me go find them too. > > Ohh, goodie, they're already in Linus' tree. Could you see if > current git still suffers this problem? > v3.14-10353-g2b3a8fd works fine AFAICS (BTW the fix is stable material, right ?)
- -- MfG/Sincerely Toralf Förster pgp finger print:1A37 6F99 4A9D 026F 13E2 4DCF C4EA CDDE 0076 E94E -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/
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