On Tue, 12 Jul 2005, Mateusz Berezecki wrote:
Hi LKML,
What does the message saying "scheduling while atomic" mean?
The kernel prints a stack backtrace after this message appears so I
suppose this is
not a good behaviour. I am finishing an open source driver, and I need
to do all of this
locking stuff, etc. and this really makes me wonder what I am doing wrong.
here is some part of a backtrace...
scheduling while atomic: insmod/0x00000001/12692
[<c03e7352>] schedule+0x632/0x640
[<c0119bb1>] __wake_up_common+0x41/0x70
[<c03e74df>] wait_for_completion+0x8f/0xf0
[<c0119b50>] default_wake_function+0x0/0x20
[<c0119b50>] default_wake_function+0x0/0x20
[<c012e2dd>] queue_work+0x8d/0xa0
[<c012e070>] __call_usermodehelper+0x0/0x70
[<c012e1a5>] call_usermodehelper_keys+0xc5/0xd0
[<c012e070>] __call_usermodehelper+0x0/0x70
[<c020c028>] sprintf+0x28/0x30
[<c020955d>] kobject_hotplug+0x29d/0x310
[<c019fc6e>] sysfs_create_link+0x3e/0x60
[<c028b601>] class_device_add+0x161/0x1e0
[<c036f38e>] netdev_register_sysfs+0x3e/0x100
[<c03650db>] netdev_run_todo+0x1eb/0x220
[<c0364dce>] register_netdev+0x5e/0x90
I enable a lock at the beginning of device attach routine
and I disable it at the end. Whats wrong with it?
You probably have the interrupts disabled (a spin-lock locked)
when some timer or other routine that will schedule() is called.
Also, make sure that you initialize all your spin-locks and
semaphores before you try to use them.
Cheers,
Dick Johnson
Penguin : Linux version 2.6.12 on an i686 machine (5537.79 BogoMips).
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