Date: Thu, 20 Jun 2013 12:53:03 +0430 From: "Javad Kouhi" <javad.kouhi@gmail.com> To: "Jeremy Chadwick" <jdc@koitsu.org> Cc: Michiel Boland <boland37@xs4all.nl>, freebsd-stable@freebsd.org Subject: Re: system sporadically hangs on shutdown after switching to WITH_NEW_XORG Message-ID: <op.wyyxkpeqmbtpl2@localhost> In-Reply-To: <20130618212818.GA58803@icarus.home.lan> References: <51BDD593.5000102@xs4all.nl> <51BF60A8.6000503@xs4all.nl> <20130617193726.GR91021@kib.kiev.ua> <CA%2Bg814fgxmkCjVNrqoTiE0AEQwGr5gystCUiMzDLCtZ3aTtk%2BQ@mail.gmail.com> <51C06AD2.5030404@xs4all.nl> <CA%2Bg814dFmC1j4Czitn-VN9z3S29qBaMW47dOBOvbsaAxPvnWpg@mail.gmail.com> <20130618144722.GA3446@icarus.home.lan> <CA%2Bg814fXiGZh%2Bh89DVdY_Rv_r9O3joTKDiwaZi5CK1qjJ556rg@mail.gmail.com> <20130618182538.GA3380@icarus.home.lan> <CA%2Bg814fShMAiVUXuu1Zqn4M9BXrXoa%2BHCWUPmxBKx-GTgyyhxg@mail.gmail.com> <20130618212818.GA58803@icarus.home.lan>
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On Wed, 19 Jun 2013 01:58:18 +0430, Jeremy Chadwick <jdc@koitsu.org> wrote: > On Wed, Jun 19, 2013 at 01:41:10AM +0430, Javad Kouhi wrote: >> I've read the posts again. Although the issue looks same as Michiel >> Boland (first link) but I'm not sure if the root of the issue is same >> as Michiel's too (second link). Anyway, it should be discussed in >> another thread as you said. > > Let me be more clear: > > I have seen repeated reports from people complaining about "lockups when > shutting down" many times over the years. The ones I remember: > > - Certain oddities with SCSI/SATA storage drivers and disks (many of > these have been fixed) > - ACPI-based reboot not working correctly on some motherboards > (depends on hw.acpi.handle_reboot and sometimes > hw.acpi.disable_on_reboot) -- not sure if this still pops up > - USB layer causing issues, or possibly some USB CAM integration > problem (this is still an ongoing one) > - Now some sort of weird Intel graphics driver (and DRM?) quirk > involving moused(8) and Vsync (the issue reported by Michiel) > > And I'm certain I'm forgetting others. > > What Kevin Oberman said also applies -- these are painful to debug > because the system is already in a "shutting down" state where usability > and accessibility becomes bare minimal, and you're kind of at your > wits end. > > Booting verbose can help -- there are other messages printed to the VGA > (and/or serial) console during the shutdown phase when verbose. > > All you can hope for is that the kernel is still alive and Ctrl-Alt-Esc > to force a drop to DDB (assuming all of this is enabled in your kernel) > works and that someone familiar with the FreeBSD kernel can help you > debug it (possibly it's just easier to do that, type "panic", then > issue "call doadump" to force a dump to swap at that point -- kib@ > might have better recommendations). > > Serial console can also greatly help, because quite often there are > pages upon pages of debugging information that are useful, otherwise you > have to hope the VGA console keyboard is functional (even more tricky > with USB) and that Scroll Lock + Page Up/Down function along with taking > photos of the screen; doing it this way is stressful and painful for > everyone involved. > > I hope this sheds some light on why I said what I did. :-) > Ok, I will compile a new kernel with DDB option. I will submit the crash info and dmesg output the next time it happens. (in a new thread) Thanks for your help. Regards,
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