On Tue, 11 Mar 2025, Carsten Grzemba via illumos-discuss wrote:
> Recently I see an crash dump with > > NOTICE: SAM-QFS: samfs1: Initiated mount filesystem > > panic[cpu3]/thread=fffffe0019e3dc20: > BAD TRAP: type=7 (#nm Device not available) rp=fffffe0019e3d780 addr=0 > ... > sam_map_block+0x6f: pxor %xmm0,%xmm0 > > I build this kernel module with GCC14. > > I have no clear understanding what "Bad trap: type=7 (#nm Device not > available) " means. Looking on the assembler instruction "pxor %xmm0,%xmm0" > seems that here special multimedia registers are used. nm - No Math(s) Co-processor (or at least that's what I've always read it as.) This is a result of trying to use a floating-point or SIMD instruction (which `pxor` is) when the CR0.TS bit is set. There's a good theory statement on kernel FPU use in: https://github.com/illumos/illumos-gate/blob/master/usr/src/uts/intel/os/fpu.c#L124-L126 In general kernel code cannot use FPU/SIMD instructions unless they make use of kernel_fpu_begin() and kernel_fpu_end() around them. In this case, I suspect you need to tell the compiler to avoid such instructions. Regards, Andy ------------------------------------------ illumos: illumos-discuss Permalink: https://illumos.topicbox.com/groups/discuss/Te2d5885af4d3b9f6-M1ef829f6547a474f98d1f851 Delivery options: https://illumos.topicbox.com/groups/discuss/subscription
