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2.6.27-rc1-mm1: busyloop time-schedule

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From: Alexey Dobriyan <adobriyan@...>
To: Andrew Morton <akpm@...>
Cc: <linux-kernel@...>
Subject: 2.6.27-rc1-mm1: busyloop time-schedule
Date: Thursday, July 31, 2008 - 8:23 am

The only suspicious thing so far is 100% CPU during "time-schedule" test
from LTP:

	[...]
pth_str03    0  INFO  :  thread 0 exiting, depth=4, status=0, addr=0xf2b010
pth_str03    0  INFO  :  The sum of tree (breadth 4, depth 3) is 3570
pth_str03    1  PASS  :  Test passed
<<<execution_status>>>
duration=0 termination_type=exited termination_id=0 corefile=no
cutime=0 cstime=3
<<<test_end>>>
<<<test_start>>>
tag=time-schedule01 stime=1217504927
cmdline="       time-schedule"

	[100% CPU here, reproducible]

"strace -p" kicks the test to completion, and shows plenty of
sched_yield() calls, IIRC.

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Messages in current thread:
2.6.27-rc1-mm1, Andrew Morton, (Thu Jul 31, 3:03 am)
Re: 2.6.27-rc1-mm1: unable to boot with gcov on x86_64, Mariusz Kozlowski, (Tue Aug 5, 4:26 pm)
Re: 2.6.27-rc1-mm1: unable to boot with gcov on x86_64, Peter Oberparleiter, (Wed Aug 6, 3:23 am)
Re: 2.6.27-rc1-mm1: unable to boot with gcov on x86_64, Mariusz Kozlowski, (Tue Aug 5, 4:29 pm)
Re: 2.6.27-rc1-mm1: sparc64 BUG: using smp_processor_id() in..., Mariusz Kozlowski, (Sat Aug 2, 11:17 am)
Re: 2.6.27-rc1-mm1: sparc64 BUG: using smp_processor_id() in..., David Miller, (Sun Aug 3, 3:02 am)
Re: 2.6.27-rc1-mm1: rmmod ide-cd_mod oops, Mariusz Kozlowski, (Sat Aug 2, 5:23 am)
Re: 2.6.27-rc1-mm1: rmmod ide-cd_mod oops, Bartlomiej Zolnierkiewicz..., (Sat Aug 2, 12:15 pm)
Re: 2.6.27-rc1-mm1: rmmod ide-cd_mod oops, Mariusz Kozlowski, (Sat Aug 2, 7:25 pm)
Re: 2.6.27-rc1-mm1: rmmod ide-cd_mod oops, Bartlomiej Zolnierkiewicz..., (Sun Aug 3, 10:41 am)
Re: 2.6.27-rc1-mm1: rmmod ide-cd_mod oops, Mariusz Kozlowski, (Sun Aug 3, 11:45 am)
[BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fails on..., Kamalesh Babulal, (Thu Jul 31, 8:43 am)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Tony Breeds, (Fri Aug 1, 1:29 am)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Kamalesh Babulal, (Fri Aug 1, 12:16 pm)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Peter 1 Oberparleiter, (Fri Aug 1, 11:44 am)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Andrew Morton, (Fri Aug 1, 2:12 am)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Sam Ravnborg, (Fri Aug 1, 12:45 pm)
Re: [BUILD-FAILURE] 2.6.27-rc1-mm1 - allyesconfig build fail..., Peter 1 Oberparleiter, (Fri Aug 1, 11:40 am)
2.6.27-rc1-mm1: busyloop time-schedule, Alexey Dobriyan, (Thu Jul 31, 8:23 am)
Re: 2.6.27-rc1-mm1, Balbir Singh, (Thu Jul 31, 4:10 am)