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X session freezes in FC 18

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I'm experiencing random freezes of two desktops, both up-to-date FC 18, totally different hardware (Core2Duo E5300, Core i7), different Graphis Cards but both Nvidia using nouveau with a dual monitor setup.

Desktop completely freezes, Num Lock on keyboard is dead. Gut feeling tells me it is induced by scrolling.

When happening, I can ssh into the machine, everything looks perfectly normal. No 100% CPU on nothing, no zombies, no whatever. Nothing in dmesg, Xorg.0.log, messages.

Restart of graphical.target does not do anything, when killing /usr/bin/X (with -9 though) I get kdm back.

Any thoughts where to debug further?

posted Jun 17, 2013 by anonymous

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1 Answer

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Have you looked in ~/.xsession-errors yet?

answer Jun 17, 2013 by anonymous
No I haven't; thanks, good input. Will do so on next freeze!
I have a couple of:
libpng warning: Application built with libpng-1.2.8 but running with 1.5.13
libpng warning: Application built with libpng-1.2.8 but running with 1.5.13
libpng warning: Application built with libpng-1.2.8 but running with 1.5.13

at the end, nothing more interesting.

I did an strace of the (already hanging) /usr/bin/X before killing it  with -9:

futex(0x3a6a50d3e0, FUTEX_WAIT_PRIVATE, 2, NULL) = ? ERESTARTSYS (To be  restarted if SA_RESTART is set)
--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---
rt_sigreturn() = -1 EINTR (Interrupted system call)
futex(0x3a6a50d3e0, FUTEX_WAIT_PRIVATE, 2, NULL) = ? ERESTARTSYS (To be restarted if SA_RESTART is set)
--- SIGALRM {si_signo=SIGALRM, si_code=SI_KERNEL} ---
rt_sigreturn() = -1 EINTR (Interrupted system call)
futex(0x3a6a50d3e0, FUTEX_WAIT_PRIVATE, 2, NULL
+++ killed by SIGKILL +++
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