To clarify, since a while the lockup moved to ttm_bo_wait_cpu (as seen
in the last Xorg.wedge.log. I hacked a bit around with function tracing
and got the following trace (which is limited atm to the two functions):
# tracer: function
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
plymouthd-316 [000] 16.812883: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
plymouthd-316 [000] 16.812938: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860119: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860316: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860319: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860320: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860322: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860324: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860326: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860333: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860335: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860337: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860338: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860340: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860342: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.860384: nouveau_gem_ioctl_cpu_fini
<-drm_ioctl
<...>-1069 [000] 17.880233: ttm_bo_wait_cpu <-validate_init
--
nouveau hard lockup in nouveau_gem_ioctl_cpu_fini
https://bugs.launchpad.net/bugs/539655
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