| title: | Re Intel graphics and kernel RT failure |
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Ccing linux-rt. Mabye someone has a flash of an idea.
On Thursday 2009-06-04 23:42, Hector Centeno wrote to Jan Engelhardt:
I hope it is OK to contact you directly to this email. Ive been
trying to use your 2.6.29 RT kernel for OpenSuse 11.1 and came across
some problems related to the Intel graphics driver (I have a laptop
with intel GMA 950). The problem seems to be related to the new intel
driver development that is going on and that seems to affect older
hardware like mine. I get a constantly growing list of errors in
/var/log/mesages like these:
kernel: BUG: using smp_processor_id() in preemptible [00000000] code: X/3257
kernel: caller is kmap_atomic_prot_pfn+0x1a/0x94
kernel: Pid: 3257, comm: X Tainted: G N 2.6.29.4-jen80-rt #1
kernel: Call Trace:
kernel: [<b033c3f2 ] ? printk+0xf/0x15
kernel: [<b022712e ] debug_smp_processor_id+0xa6/0xbc
kernel: [<b011d617 ] kmap_atomic_prot_pfn+0x1a/0x94
kernel: [<f8a23c4c ] i915_gem_object_flush_cpu_write_domain+0x1c/0x27 [i915]
kernel: [<b011d6b7 ] iomap_atomic_prot_pfn+0x26/0x2b
kernel: [<f8a270be ] i915_gem_gtt_pwrite+0x102/0x1b8 [i915]
kernel: [<f8a27290 ] i915_gem_pwrite_ioctl+0x11c/0x1a8 [i915]
kernel: [<b0223e73 ] ? copy_from_user+0x34/0x11b
kernel: [<f89d2776 ] drm_ioctl+0x1b7/0x22f [drm]
kernel: [<f8a27174 ] ? i915_gem_pwrite_ioctl+0x0/0x1a8 [i915]
kernel: [<b01ae63f ] vfs_ioctl+0x4e/0x67
kernel: [<b01aec30 ] do_vfs_ioctl+0x22a/0x242
kernel: [<b01aec88 ] sys_ioctl+0x40/0x5a
kernel: [<b01032fc ] sysenter_do_call+0x12/0x28
kernel: BUG: using smp_processor_id() in preemptible [00000000] code: X/3257
kernel: caller is iounmap_atomic+0x18/0x9b
kernel: Pid: 3257, comm: X Tainted: G N 2.6.29.4-jen80-rt #1
kernel: Call Trace:
kernel: [<b033c3f2 ] ? printk+0xf/0x15
kernel: [<b022712e ] debug_smp_processor_id+0xa6/0xbc
kernel: [<b011d57a ] iounmap_atomic+0x18/0x9b
kernel: [<f8a270df ] i915_gem_gtt_pwrite+0x123/0x1b8 [i915]
kernel: [<f8a27290 ] i915_gem_pwrite_ioctl+0x11c/0x1a8 [i915]
kernel: [<b0223e73 ] ? copy_from_user+0x34/0x11b
kernel: [<f89d2776 ] drm_ioctl+0x1b7/0x22f [drm]
kernel: [<f8a27174 ] ? i915_gem_pwrite_ioctl+0x0/0x1a8 [i915]
kernel: [<b01ae63f ] vfs_ioctl+0x4e/0x67
kernel: [<b01aec30 ] do_vfs_ioctl+0x22a/0x242
kernel: [<b01aec88 ] sys_ioctl+0x40/0x5a
kernel: [<b01032fc ] sysenter_do_call+0x12/0x28
Im assuming it is related to the Intel graphics driver because there
is mention to i915 but I might be wrong. If the Intel driver is
causing this I wonder if this has been fixed in upstream [...]
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