Messages in this thread | | | Subject | Re: [PATCH x86/mm] x86_64 save_i387_ia32 snafu | From | Valdis.Kletnieks@vt ... | Date | Sat, 12 Jan 2008 00:51:58 -0500 |
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On Fri, 11 Jan 2008 13:31:47 PST, Roland McGrath said: > > thanks, applied. Does this explain the crash/hang problems with 32-bit > > apps on 64-bit kernels? What was the exact failure mode? > > It does. Any 32-bit process trying to run a signal handler when it had > used the FPU, would clobber "current" with FP bits. The observed failure > mode was shortly after this in the signal handler setup code, when it > crashed due to current->mm being zero (current->pid also being zero, and > the whole first 512 bytes of the task_struct being garbage).
For what it's worth, this patch fixes a problem I had in 24-rc6-mm1 with kernel panics when certain X programs exited (Eterm being the biggest cause), that I had bisected to "somewhere in git-x86.patch".... [unhandled content-type:application/pgp-signature] | |