Messages in this thread | | | Date | Wed, 9 Oct 2013 21:08:51 +0200 | From | Jakub Jelinek <> | Subject | Re: [x86] BUG: unable to handle kernel paging request at 00740060 |
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On Wed, Oct 09, 2013 at 09:02:31PM +0200, Peter Zijlstra wrote: > On Wed, Oct 09, 2013 at 08:16:13PM +0200, Jakub Jelinek wrote: > > Confirmed as gcc bug, filed http://gcc.gnu.org/PR58670 > > Seems all of 4.[6-9] miscompile it. Will have a look tomorrow > > unless somebody beats me to it. But historically, the case where > > asm goto labels jump to fallthru basic block had numerous problems in the > > past. > > That bug lists the component as middle end; this suggests x86_64 would > be vulnerable too, can you confirm? So far we've only observed the wrong > code on i386 targets, x86_64 targets appeared correct.
Any target, the testcase in the bugzilla aborts on x86_64 with -O2, and even say on ppc64 (sure, one would have to rewrite the asm to have it fail at runtime).
Jakub
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