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nvidia-drivers-364.12 seems to cause sddm to segfault
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davidm
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PostPosted: Thu Mar 24, 2016 4:48 am    Post subject: nvidia-drivers-364.12 seems to cause sddm to segfault Reply with quote

I was having problems immediately after emerging nvidia-drivers-364.12. Upon rebooting I found that sddm would segfault with messages like:

Code:

Mar 23 23:57:31 gentoo sddm[1999]: Socket server started.
Mar 23 23:57:31 gentoo sddm[1999]: Greeter starting...
Mar 23 23:57:31 gentoo sddm[1999]: Adding cookie to "/var/run/sddm/{500c1xx9-f839-4xx5-b0e4-b25fxxxcexxa}"
Mar 23 23:57:31 gentoo sddm[1999]: /usr/bin/xauth: (stdin):1:  bad "remove" command line
Mar 23 23:57:31 gentoo sddm[1999]: /usr/bin/xauth: (stdin):2:  bad "add" command line
Mar 23 23:57:31 gentoo sddm[1999]: QProcess: Destroyed while process ("/usr/libexec/sddm-helper") is still running.
Mar 23 23:57:31 gentoo kernel: sddm[1999]: segfault at 7a0 ip 00000000000007a0 sp 00007ffdde7fbc48 error 14 in sddm[400000+69000]
Mar 23 23:57:31 gentoo sddm-helper[2090]: [PAM] Starting...
Mar 23 23:57:31 gentoo sddm-helper[2090]: [PAM] Authenticating...
Mar 23 23:57:31 gentoo sddm-helper[2090]: [PAM] returning.
Mar 23 23:57:31 gentoo sddm-helper[2090]: Received a wrong opcode instead of AUTHENTICATED: 0
Mar 23 23:57:31 gentoo systemd[1]: sddm.service: Main process exited, code=dumped, status=11/SEGV
Mar 23 23:57:31 gentoo systemd[1]: sddm.service: Unit entered failed state.
Mar 23 23:57:31 gentoo systemd[1]: sddm.service: Failed with result 'core-dump'.
Mar 23 23:57:32 gentoo sddm[2094]: /usr/bin/xauth: (stdin):1:  bad "remove" command line
Mar 23 23:57:32 gentoo sddm[2094]: /usr/bin/xauth: (stdin):2:  bad "add" command line
Mar 23 23:57:32 gentoo systemd[1]: sddm.service: Service hold-off time over, scheduling restart.
Mar 23 23:57:32 gentoo sddm[2094]: /usr/bin/xauth: (stdin):1:  bad "remove" command line
Mar 23 23:57:32 gentoo sddm[2094]: /usr/bin/xauth: (stdin):2:  bad "add" command line
Mar 23 23:57:32 gentoo sddm[2094]: Initializing...
Mar 23 23:57:32 gentoo sddm[2094]: Starting...


I tried re-installing sddm and nvidia-drivers but the same thing occurred. I had to mask "nvidia-drivers-364.12" and then rebuild my kernel 4.5.0 and then every thing worked again.

Anyone else seeing something like this?
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malc
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PostPosted: Thu Mar 24, 2016 12:44 pm    Post subject: Reply with quote

Seeing the exact same thing, did some debugging last night - look in your Xorg.0.log for the failing case - does it complain about not being able to open /dev/dri/card0 ?
That seems to be the root of the issue, for some reason with the new driver, the creation of that device-node isn't being triggered in udev, I switch back to the old nvidia-drivers version, and it all works...

gentoo-sources-4.4.6, GTX970.
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davidm
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PostPosted: Thu Mar 24, 2016 11:37 pm    Post subject: Reply with quote

Unfortunately since downgrading I rebooted a few times and no longer have a log for it. I also was not able to find any such message in the journal, only errors from sddm segfaults. Here is the GPU though should it help identify a pattern:

Code:

01:00.0 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 730] (rev a1)


I see that a lot of new stuff has been introduced in this beta driver so it might be something weird related to it. If it is messing up for almost all Gentoo users trying it then we should be seeing a lot more messages soon.
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malc
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PostPosted: Fri Mar 25, 2016 10:49 am    Post subject: Reply with quote

Another user reported the same missing /dev/dri/card0 at https://bugs.gentoo.org/show_bug.cgi?id=577982
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