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Code paths like fork(), exit() and signal handling flush the fpu state explicitly to the structures in memory. BUG_ON() in __sanitize_i387_state() is checking that the fpu state is not live any more. But for preempt kernels, task can be scheduled out and in at any place and the preload_fpu logic during context switch can make the fpu registers live again. For example, consider a 64-bit Task which uses fpu frequently and as such you will find its fpu_counter mostly non-zero. During its time slice, kernel used fpu by doing kernel_fpu_begin/kernel_fpu_end(). After this, in the same scheduling slice, task-A got a signal to handle. Then during the signal setup path we got preempted when we are just before the sanitize_i387_state() in arch/x86/kernel/xsave.c:save_i387_xstate(). And when we come back we will have the fpu registers live that can hit the bug_on. Similarly during core dump, other threads can context-switch in and out (because of spurious wakeups while waiting for the coredump to finish in kernel/exit.c:exit_mm()) and the main thread dumping core can run into this bug when it finds some other thread with its fpu registers live on some other cpu. So remove the paranoid check for now, even though it caught a bug in the multi-threaded core dump case (fixed in the previous patch). Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Link: http://lkml.kernel.org/r/1336692811-30576-3-git-send-email-suresh.b.siddha@intel.com Cc: Oleg Nesterov <oleg@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> |
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