On Thu, Sep 26, 2019 at 11:02 AM Konstantin Belousov <kostik...@gmail.com> wrote:
> On Thu, Sep 26, 2019 at 09:45:43AM -0600, Alan Somers wrote: > > The latest VM snapshot > (FreeBSD-13.0-CURRENT-amd64-20190920-r352544.qcow2) > > instapanics on boot: > > > > panic: Unregistered use of FPU in kernel > > > > stack trace: > > ... > > sse42_crc32c > > readsuper > > ffs_sbget > > g_label_ufs_taste_common > > g_label_taste > > g_new_provider_event > > g_run_events > > fork_exit > > ... > > > > Has anybody touched this area recently? I'll try to narrow down the > commit > > range. > > Start with disassembling the faulting instruction. I suspect that somehow > vital compiler switches like -mno-sse got omitted in the build. > No problem with compiler switches here. The C file uses inline assembly to generate a crc32q instruction, in crc32_sse42.c:257. But why would that generate a floating point exception? The instruction doesn't appear to be using any floating point registers. This is on a Kaby Lake CPU. crc32q %rsi, %rbx _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
