Helge Deller writes via Kernel.org Bugzilla:
I'd assume the segfault on x86 is because of the vDSO implementation
of getcpu() on x86, which executes vdso_read_cpunode() from
arch/x86/include/asm/segment.h:
static inline void vdso_read_cpunode(unsigned *cpu, unsigned *node)
{
...
if (cpu)
*cpu = (p & VDSO_CPUNODE_MASK);
if (node)
*node = (p >> VDSO_CPUNODE_BITS);
View: https://bugzilla.kernel.org/show_bug.cgi?id=219339#c4
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