Messages in this thread | | | Date | Fri, 12 Oct 2018 15:27:44 -0700 | From | Solio Sarabia <> | Subject | Re: turbostat-17.06.23 floating point exception |
| |
On Fri, Oct 12, 2018 at 11:26:30AM -0700, Solio Sarabia wrote: > Hi -- > > turbostat 17.06.23 is throwing an exception on a custom linux-4.16.12 > kernel, on Xeon E5-2699 v4 Broadwell EP, 2S, 22C/S, 44C total, HT off, > VTx off. > > Initially the system had 4.4.0-137. Then I built and installed > linux-4.16.12-default. turbostat works fine for these two versions. > After building linux-4.16.12 for a second time, the older kernel is > renamed and now `ls -l /boot/` (I'm using version without .old suffix): > > vmlinuz-4.16.12-default+ > vmlinuz-4.16.12-default+.old > > grep -i 'turbostat' /var/log/kern.log > > kernel: [ 159.140836] capability: warning: `turbostat' uses 32-bit > capabilities (legacy support in use) > kernel: [ 164.149264] traps: turbostat[1801] trap divide error > ip:407625 sp:7ffe4b0df000 error:0 in turbostat[400000+17000] > > (gdb) > cpu22: MSR_PKGC3_IRTL: 0x00000000 (NOTvalid, 0 ns) > cpu22: MSR_PKGC6_IRTL: 0x00000000 (NOTvalid, 0 ns) > cpu22: MSR_PKGC7_IRTL: 0x00000000 (NOTvalid, 0 ns) > > Program received signal SIGFPE, Arithmetic exception. > 0x0000000000407625 in compute_average (t=0x61a3b0, c=0x61a3d0, p=0x61a480) at turbostat.c:1378 > 1378 average.threads.tsc /= topo.num_cpus; > Why would the cpu topology report 0 cpus? I added a debug entry to cpu_usage_stat and /proc/stat showed it as an extra column. Then fscanf parsing in for_all_cpus() failed, causing the SIGFPE.
This is not an issue. Thanks.
> Let me know if you need more details. > > Thanks, > -SS
| |