Date: Tue, 11 Feb 2020 12:05:19 -0800 From: Conrad Meyer <cem@freebsd.org> To: Andreas Nilsson <andrnils@gmail.com> Cc: "Andrey V. Elsukov" <bu7cher@yandex.ru>, Current FreeBSD <freebsd-current@freebsd.org> Subject: Re: hwpstate_intel hangs kernel Message-ID: <CAG6CVpWdNrp6jCO_qw-ywcnUa8Qq1dY2fA%2Bk1BK=s%2BHxLfpCew@mail.gmail.com> In-Reply-To: <CAPS9%2BSuZe5=2ec8Pz=cHAQ6qn-3NZaKi=mwY4VRSBPGg5ez5bg@mail.gmail.com> References: <CAPS9%2BSukk_MFzUFBjs2K8bjsayL%2BTedhtY9aC8VF-UCHKEpp-w@mail.gmail.com> <a2a81eb9-c7d8-869a-5024-6bf0000c22a1@yandex.ru> <ccebd015-ae44-b4b9-aca6-080528bc0d64@yandex.ru> <CAG6CVpXq1xL=u=yYWd_srCDFb2s1asN%2Bm9%2BGA43WF3%2BQmpq5aw@mail.gmail.com> <CAPS9%2BSuniZZ6mvQzFmMvY=5i-G%2BOjCF5A_yMnBYmrZWo77dOug@mail.gmail.com> <CAPS9%2BSs__9HTg6RAu1JrLa5YOB8hK1%2BZFD05mNP%2BSnih8qiO8w@mail.gmail.com> <CAPS9%2BSuZe5=2ec8Pz=cHAQ6qn-3NZaKi=mwY4VRSBPGg5ez5bg@mail.gmail.com>
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Hi Andreas, No, nothing new on this front. I don't have any of this hardware nor do I work for Intel, and nothing I see in the code or published spec would result in hangs. I don't have more cycles to spend on this driver. So I suggest using 'hint.hwpstate_intel.0.disabled=3D"1"' as a workaround indefinitely. On a private email with Andrey I discussed making disabled=3D"1" the default, and allowing users to opt in with disabled=3D"0" (or perhaps enabled=3D"1", for fewer double negatives). It's not especially satisfying, but would prevent this class of unknown issue with hwpstate_intel(4). Best, Conrad On Tue, Feb 11, 2020 at 11:49 AM Andreas Nilsson <andrnils@gmail.com> wrote= : > > Hello, > > any new leads on this? As of what is in git on 2020-02-05, my computer st= ill hangs on kernel boot on "hwpstate_intel0: <Intel Speed Shift> on cpu0" > > I guess it would have been easier to debug a panic. Setting debug.hwpstat= e_verbose=3D1 doesn't really give any difference in output. > > Best regards > Andreas > > On Wed, Feb 5, 2020 at 2:45 PM Andreas Nilsson <andrnils@gmail.com> wrote= : >> >> Hello, >> >> I upgraded to a newer version, git 87d669d3863-c266265, and I do not ex= perience the random hang anymore. The machine still hangs on boot on "hwpst= ate_intel0: <Intel Speed Shift> on cpu0" unless I set 'hint.hwpstate_intel.= 0.disabled=3D"1"' in loader.conf. >> >> On a side note I cannot set or unset that hint from loader prompt; >> >> ok> set hint.hwpstate_intel.0.disabled=3D"0" >> ok> show >> .... >> hint.hwpstate=3D >> ... >> >> Best regards >> Andreas >> >> On Sat, Feb 1, 2020 at 11:26 PM Andreas Nilsson <andrnils@gmail.com> wro= te: >>> >>> Hello Conrad, >>> >>> thank you Andrey for bisecting! I'll try with that hint and see how it = works for me. >>> >>> Best regards >>> Andreas >>> >>> On Sat, Feb 1, 2020, 18:18 Conrad Meyer <cem@freebsd.org> wrote: >>>> >>>> Hi Andrey, >>>> >>>> Please try 'hint.hwpstate_intel.0.disabled=3D"1"' as a workaround for = now. >>>> >>>> I think I have identified at least one problematic piece of code, >>>> although I don't know if it's the root cause. I will go ahead and fix >>>> that, which may not fix the hang, and also add some debug printfs that >>>> can be enabled to help identify the real issue. >>>> >>>> Thanks for the report and bisect. >>>> >>>> Best, >>>> Conrad >>>> >>>> On Sat, Feb 1, 2020 at 6:06 AM Andrey V. Elsukov <bu7cher@yandex.ru> w= rote: >>>> > >>>> > 31.01.2020 18:11, Andrey V. Elsukov =D0=BF=D0=B8=D1=88=D0=B5=D1=82: >>>> > > On 24.01.2020 19:52, Andreas Nilsson wrote: >>>> > >> It hangs during kernel boot and the last message printed on conso= le is: >>>> > >> hwpstate_intel0: <Intel Speed Shift> on cpu0 >>>> > > >>>> > > Hi, >>>> > > >>>> > > Did you find the cause of this hang? >>>> > > I also tried to update today from r350816 to r357330. But my Lenov= o X1 >>>> > > Carbon 4th hangs on the same message. >>>> > > >>>> > >>>> > Hi, >>>> > >>>> > I have bisected the bad commit, it is r357002. >>>> > >>>> > -- >>>> > WBR, Andrey V. Elsukov >>>> >
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