hello kozlek
i'm using last version of hwsensors
and booting 10.9 i get a lot of this in my dmesg
SMC::smcReadKeyAction ERROR CG3S kSMCBadArgumentError(0x89) fKeyHashTable=0x0xffffff8025871800 SMC::smcReadKeyAction ERROR CG1R kSMCBadArgumentError(0x89) fKeyHashTable=0x0xffffff8025871800
and this in kernel log
12/06/13 00:00:28,000 kernel[0]: SMC::smcInitHelper ERROR: MMIO regMap == NULL - fall back to old SMC mode
thanks for u work
It's not hwsensors problem. Search for "SMC fix mavericks" and install new AppleSMC.kext.