When running 2.6.20-rt5 on a Via Apollo based mainboard with the "low
latency desktop" preemption setting active the following messages were
logged. This isn't all of them - there were quite a few, some of which
passed out of the message buffer. I didn't see this with 2.6.19.2.
I don't know about earlier -rt kernels because the machine concerned is
a recent acquisition.
Any ideas? I'm happy to test things if it will help narrow down the
problem.
Regards
jonathan
=======================
BUG: scheduling while atomic: swapper/0x00000001/1, CPU#0
[<c0360e21>] __sched_text_start+0x91/0x5f5
[<c036146b>] schedule+0xe6/0x100
[<c0124ed8>] flush_cpu_workqueue+0x92/0xd0
[<c01279f1>] autoremove_wake_function+0x0/0x33
[<c01279f1>] autoremove_wake_function+0x0/0x33
[<c0152188>] filevec_add_drain_per_cpu+0x0/0x2
[<c0124f3a>] flush_workqueue+0x24/0x2f
[<c012536a>] schedule_on_each_cpu_wq+0x82/0x92
[<c017e44d>] remove_proc_entry+0x110/0x167
[<c017e379>] remove_proc_entry+0x3c/0x167
[<c011c1f3>] unregister_proc_table+0x60/0x73
[<c011c1cf>] unregister_proc_table+0x3c/0x73
[<c011c1cf>] unregister_proc_table+0x3c/0x73
[<c011c1cf>] unregister_proc_table+0x3c/0x73
[<c011c1cf>] unregister_proc_table+0x3c/0x73
[<c011c07d>] unregister_sysctl_table+0x21/0x3f
[<c02b2c9c>] parport_device_proc_unregister+0x16/0x22
[<c02b08bb>] parport_unregister_device+0xc/0xf9
[<c02b3c11>] parport_device_id+0xa4/0xaf
[<c02b2e88>] parport_daisy_init+0x130/0x1c0
[<c0135045>] setup_irq+0x19b/0x1f8
[<c02b04f4>] parport_announce_port+0x9/0xb4
[<c02b6496>] parport_pc_probe_port+0x57a/0x5e9
[<c02b6b9f>] sio_via_probe+0x325/0x398
[<c011b9f3>] __request_region+0x4e/0x86
[<c04601aa>] parport_pc_init_superio+0x43/0x67
[<c04601e7>] parport_pc_find_ports+0x19/0x69
[<c046062c>] parport_pc_init+0x88/0x91
[<c044a758>] do_initcalls+0x58/0xf5
[<c017e241>] proc_mkdir_mode+0x3e/0x51
[<c0136436>] register_irq_proc+0x5a/0x6a
[<c0100376>] init+0x0/0x14e
[<c01003b9>] init+0x43/0x14e
[<c0103827>] kernel_thread_helper+0x7/0x10
=======================
BUG: scheduling while atomic: swapper/0x00000001/1, CPU#0
[<c0360e21>] __sched_text_start+0x91/0x5f5
[<c036146b>] schedule+0xe6/0x100
[<c0124ed8>] flush_cpu_workqueue+0x92/0xd0
[<c01279f1>] autoremove_wake_function+0x0/0x33
[<c01279f1>] autoremove_wake_function+0x0/0x33
[<c0152188>] filevec_add_drain_per_cpu+0x0/0x2
[<c0124f3a>] flush_workqueue+0x24/0x2f
[<c012536a>] schedule_on_each_cpu_wq+0x82/0x92
[<c017e44d>] remove_proc_entry+0x110/0x167
[<c017e379>] remove_proc_entry+0x3c/0x167
[<c011c1f3>] unregister_proc_table+0x60/0x73
[<c011c1cf>] unregister_proc_table+0x3c/0x73
[<c011c1cf>] unregister_proc_table+0x3c/0x73
[<c011c1cf>] unregister_proc_table+0x3c/0x73
[<c011c07d>] unregister_sysctl_table+0x21/0x3f
[<c02b2c9c>] parport_device_proc_unregister+0x16/0x22
[<c02b08bb>] parport_unregister_device+0xc/0xf9
[<c02b3c11>] parport_device_id+0xa4/0xaf
[<c02b2e88>] parport_daisy_init+0x130/0x1c0
[<c0135045>] setup_irq+0x19b/0x1f8
[<c02b04f4>] parport_announce_port+0x9/0xb4
[<c02b6496>] parport_pc_probe_port+0x57a/0x5e9
[<c02b6b9f>] sio_via_probe+0x325/0x398
[<c011b9f3>] __request_region+0x4e/0x86
[<c04601aa>] parport_pc_init_superio+0x43/0x67
[<c04601e7>] parport_pc_find_ports+0x19/0x69
[<c046062c>] parport_pc_init+0x88/0x91
[<c044a758>] do_initcalls+0x58/0xf5
[<c017e241>] proc_mkdir_mode+0x3e/0x51
[<c0136436>] register_irq_proc+0x5a/0x6a
[<c0100376>] init+0x0/0x14e
[<c01003b9>] init+0x43/0x14e
[<c0103827>] kernel_thread_helper+0x7/0x10
=======================
BUG: scheduling while atomic: swapper/0x00000001/1, CPU#0
[<c0360e21>] __sched_text_start+0x91/0x5f5
[<c036146b>] schedule+0xe6/0x100
[<c0124ed8>] flush_cpu_workqueue+0x92/0xd0
[<c01279f1>] autoremove_wake_function+0x0/0x33
[<c01279f1>] autoremove_wake_function+0x0/0x33
[<c0152188>] filevec_add_drain_per_cpu+0x0/0x2
[<c0124f3a>] flush_workqueue+0x24/0x2f
[<c012536a>] schedule_on_each_cpu_wq+0x82/0x92
[<c017e44d>] remove_proc_entry+0x110/0x167
[<c017e379>] remove_proc_entry+0x3c/0x167
[<c011c1f3>] unregister_proc_table+0x60/0x73
[<c011c1cf>] unregister_proc_table+0x3c/0x73
[<c011c1cf>] unregister_proc_table+0x3c/0x73
[<c011c07d>] unregister_sysctl_table+0x21/0x3f
[<c02b2c9c>] parport_device_proc_unregister+0x16/0x22
[<c02b08bb>] parport_unregister_device+0xc/0xf9
[<c02b3c11>] parport_device_id+0xa4/0xaf
[<c02b2e88>] parport_daisy_init+0x130/0x1c0
[<c0135045>] setup_irq+0x19b/0x1f8
[<c02b04f4>] parport_announce_port+0x9/0xb4
[<c02b6496>] parport_pc_probe_port+0x57a/0x5e9
[<c02b6b9f>] sio_via_probe+0x325/0x398
[<c011b9f3>] __request_region+0x4e/0x86
[<c04601aa>] parport_pc_init_superio+0x43/0x67
[<c04601e7>] parport_pc_find_ports+0x19/0x69
[<c046062c>] parport_pc_init+0x88/0x91
[<c044a758>] do_initcalls+0x58/0xf5
[<c017e241>] proc_mkdir_mode+0x3e/0x51
[<c0136436>] register_irq_proc+0x5a/0x6a
[<c0100376>] init+0x0/0x14e
[<c01003b9>] init+0x43/0x14e
[<c0103827>] kernel_thread_helper+0x7/0x10
=======================
lp0: using parport0 (interrupt-driven).
parport_pc: VIA parallel port: io=0x378, irq=7