Preempt Violation

This one looks particularly nasty.

20ms non-preemptible critical section violated 4 ms preempt threshold starting a
t sys_ioctl+0x42/0x260 and ending at sys_ioctl+0xbd/0x260

 [<c015881d>] sys_ioctl+0xbd/0x260
 [<c0116510>] dec_preempt_count+0x110/0x120
 [<c015881d>] sys_ioctl+0xbd/0x260
 [<c0103e95>] sysenter_past_esp+0x52/0x71

Gabriel Devenyi
[email protected]

Yes, it looks like there are serious issues with ioctl.

Are you using either of the recent patches to fully daemonize softirqs? This should help a lot. I am using this one:

http://lkml.org/lkml/2004/7/13/125

It applied against 2.6.8-mm1, with only one PPC-specific reject, I use i386 so it doesn't matter.

Here is another:

http://lkml.org/lkml/2004/7/13/152

Have not tested yet.

Lee