Re: calling getcpu with misaligned address causes kernel panic

Helge Deller writes via Kernel.org Bugzilla:

This *is* a bug in qemu.
When running on a physical box, strace shows that the kernel behaves correctly:

mmap2(NULL, 4096, PROT_READ, MAP_SHARED|MAP_ANONYMOUS, -1, 0) = 0xf9000000
getcpu(0xf9000000, 0xf9000001, NULL)    = -1 EFAULT (Bad address)
exit_group(-1)                          = ?
+++ exited with 255 +++

On an AMD64 box I get a segfault (which seems strange?):

mmap(NULL, 4096, PROT_READ, MAP_SHARED|MAP_ANONYMOUS, -1, 0) = 0x7f2b62c73000
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_ACCERR, si_addr=0x7f2b62c73000} ---
+++ killed by SIGSEGV +++
Segmentation fault

qemu-user works OK.

will try qemu-system soon.

View: https://bugzilla.kernel.org/show_bug.cgi?id=219339#c2
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