Date: Tue, 3 Jul 2018 17:10:17 -0700 From: Pete Wright <pete@nomadlogic.org> To: John Baldwin <jhb@FreeBSD.org>, Niclas Zeising <zeising+freebsd@daemonic.se>, "O. Hartmann" <ohartmann@walstatt.org>, FreeBSD Current <freebsd-current@FreeBSD.org> Subject: Re: atomic changes break drm-next-kmod? Message-ID: <24f5d737-a205-6fcc-0a33-a84601d2ff7a@nomadlogic.org> In-Reply-To: <4c5411dd-9f6b-7245-6ade-e11040f74687@FreeBSD.org> References: <c640afcd-1fa4-a43e-5f36-f0bd11aad63d@protected-networks.net> <20180703170223.266dbf5b@thor.intern.walstatt.dynvpn.de> <cbd2d2f2-8ce4-871a-9aaf-75738d6c465b@daemonic.se> <ee0f7fce-7ce3-3784-f9e8-0f6862d59303@FreeBSD.org> <c7a3b447-00e9-8501-0484-841a371cfd62@nomadlogic.org> <bb2cac77-4bcd-c87c-9bc9-ce5f8ce1c726@nomadlogic.org> <845aca10-8c01-fa3b-087f-f957df4e7531@nomadlogic.org> <063ae5c3-0584-1284-dd9d-ab8b5790baf1@FreeBSD.org> <0bf8e57b-fdb4-4c1a-3d0d-a734f8187ca8@nomadlogic.org> <4c5411dd-9f6b-7245-6ade-e11040f74687@FreeBSD.org>
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On 07/03/2018 15:56, John Baldwin wrote: > On 7/3/18 3:34 PM, Pete Wright wrote: >> >> On 07/03/2018 15:29, John Baldwin wrote: >>> That seems like kgdb is looking at the wrong CPU. Can you use >>> 'info threads' and look for threads not stopped in 'sched_switch' >>> and get their backtraces? You could also just do 'thread apply >>> all bt' and put that file at a URL if that is easiest. >>> >> >> sure thing John - here's a gist of "thread apply all bt" >> >> https://gist.github.com/gem-pete/d8d7ab220dc8781f0827f965f09d43ed > That doesn't look right at all. Are you sure the kernel matches the > vmcore? Also, which kgdb version are you using? > yea i agree that doesn't look right at all. here is my setup: $ which kgdb /usr/bin/kgdb $ kgdb GNU gdb 6.1.1 [FreeBSD] $ ls -lh /var/crash/vmcore.1 -rw------- 1 root wheel 1.6G Jul 3 15:03 /var/crash/vmcore.1 $ ls -l /usr/lib/debug/boot/kernel/kernel.debug -r-xr-xr-x 1 root wheel 87840496 Jul 3 13:54 /usr/lib/debug/boot/kernel/kernel.debug and i invoke kgdb like so: $ sudo kgdb /usr/lib/debug/boot/kernel/kernel.debug /var/crash/vmcore.1 here's a gist of my full gdb session: http://termbin.com/krsn dunno - maybe i have a bad core dump? regardless, more than happy to help so let me know if i should try anything else or patches etc.. -pete -- Pete Wright pete@nomadlogic.org @nomadlogicLA
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