Hi Catalin, Will, et al, During userspace (Debian jessie NFS root) boot on arm64: rpcbind[1083]: unhandled level 0 translation fault (11) at 0x00000008, esr 0x92000004, in dash[aaaaadf77000+1a000] CPU: 0 PID: 1083 Comm: rpcbind Not tainted 4.15.0-rc3-arm64-renesas-02176-g14f9a1826e48e355 #51 Hardware name: Renesas Salvator-X 2nd version board based on r8a7795 ES2.0+ (DT) pstate: 80000000 (Nzcv daif -PAN -UAO) pc : 0xaaaaadf8a51c lr : 0xaaaaadf8ac08 sp : 0000ffffcffeac00 x29: 0000ffffcffeac00 x28: 0000aaaaadfa1000 x27: 0000ffffcffebf7c x26: 0000ffffcffead20 x25: 0000aaaacea1c5f0 x24: 0000000000000000 x23: 0000aaaaadfa1000 x22: 0000aaaaadfa1000 x21: 0000000000000000 x20: 0000000000000008 x19: 0000000000000000 x18: 0000ffffcffeb500 x17: 0000ffffa22babfc x16: 0000aaaaadfa1ae8 x15: 0000ffffa2363588 x14: ffffffffffffffff x13: 0000000000000020 x12: 0000000000000010 x11: 0101010101010101 x10: 0000aaaaadfa1000 x9 : 00000000ffffff81 x8 : 0000aaaaadfa2000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000aaaaadfa2338 x4 : 0000aaaaadfa2000 x3 : 0000aaaaadfa2338 x2 : 0000000000000000 x1 : 0000aaaaadfa28b0 x0 : 0000aaaaadfa4c30 Sometimes it happens with other processes, but the main address, esr, and pstate values are always the same. I regularly run arm64/for-next/core (through bi-weekly renesas-drivers releases, so the last time was two weeks ago), but never saw the issue before until today, so probably v4.15-rc1 is OK. Unfortunately it doesn't happen during every boot, which makes it cumbersome to bisect. My first guess was UNMAP_KERNEL_AT_EL0, but even after disabling that, and even without today's arm64/for-next/core merged in, I still managed to reproduce the issue, so I believe it was introduced in v4.15-rc2 or v4.15-rc3. Once, when the kernel message above wasn't shown, I got an error from userspace, which may be related: *** Error in `/bin/sh': free(): invalid pointer: 0x0000aaaadd970988 *** Do you have a clue? Thanks! Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds