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Hiroshi Shimamoto ec5d498991 sched: fix deadlock in setting scheduler parameter to zero 
Andrei Gusev wrote:

> I played witch scheduler settings. After doing something like:
> echo -n 1000000 >sched_rt_period_us
>
> command is locked. I found in kernel.log:
>
> Sep 11 00:39:34 zaratustra
> Sep 11 00:39:34 zaratustra Pid: 4495, comm: bash Tainted: G        W
> (2.6.26.3 #12)
> Sep 11 00:39:34 zaratustra EIP: 0060:[<c0213fc7>] EFLAGS: 00210246 CPU: 0
> Sep 11 00:39:34 zaratustra EIP is at div64_u64+0x57/0x80
> Sep 11 00:39:34 zaratustra EAX: 0000389f EBX: 00000000 ECX: 00000000
> EDX: 00000000
> Sep 11 00:39:34 zaratustra ESI: d9800000 EDI: d9800000 EBP: 0000389f
> ESP: ea7a6edc
> Sep 11 00:39:34 zaratustra DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
> Sep 11 00:39:34 zaratustra Process bash (pid: 4495, ti=ea7a6000
> task=ea744000 task.ti=ea7a6000)
> Sep 11 00:39:34 zaratustra Stack: 00000000 000003e8 d9800000 0000389f
> c0119042 00000000 00000000 00000001
> Sep 11 00:39:34 zaratustra 00000000 00000000 ea7a6f54 00010000 00000000
> c04d2e80 00000001 000e7ef0
> Sep 11 00:39:34 zaratustra c01191a3 00000000 00000000 ea7a6fa0 00000001
> ffffffff c04d2e80 ea5b2480
> Sep 11 00:39:34 zaratustra Call Trace:
> Sep 11 00:39:34 zaratustra [<c0119042>] __rt_schedulable+0x52/0x130
> Sep 11 00:39:34 zaratustra [<c01191a3>] sched_rt_handler+0x83/0x120
> Sep 11 00:39:34 zaratustra [<c01a76a6>] proc_sys_call_handler+0xb6/0xd0
> Sep 11 00:39:34 zaratustra [<c01a76c0>] proc_sys_write+0x0/0x20
> Sep 11 00:39:34 zaratustra [<c01a76d9>] proc_sys_write+0x19/0x20
> Sep 11 00:39:34 zaratustra [<c016cc68>] vfs_write+0xa8/0x140
> Sep 11 00:39:34 zaratustra [<c016cdd1>] sys_write+0x41/0x80
> Sep 11 00:39:34 zaratustra [<c0103051>] sysenter_past_esp+0x6a/0x91
> Sep 11 00:39:34 zaratustra =======================
> Sep 11 00:39:34 zaratustra Code: c8 41 0f ad f3 d3 ee f6 c1 20 0f 45 de
> 31 f6 0f ad ef d3 ed f6 c1 20 0f 45 fd 0f 45 ee 31 c9 39 eb 89 fe 89 ea
> 77 08 89 e8 31 d2 <f7> f3 89 c1 89 f0 8b 7c 24 08 f7 f3 8b 74 24 04 89
> ca 8b 1c 24
> Sep 11 00:39:34 zaratustra EIP: [<c0213fc7>] div64_u64+0x57/0x80 SS:ESP
> 0068:ea7a6edc
> Sep 11 00:39:34 zaratustra ---[ end trace 4eaa2a86a8e2da22 ]---

fix the boundary condition.

sysctl_sched_rt_period=0 makes exception at to_ratio().

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-09-11 09:39:18 +02:00
..
irq
genirq: switch /proc/irq/*/smp_affinity et al to seqfiles
2008-08-12 16:07:30 -07:00
power
ftrace: disable tracing for hibernation
2008-08-28 12:27:39 -07:00
time
sched_clock: fix NOHZ interaction
2008-09-05 18:14:08 +02:00
trace
Merge branch 'linus' into cpus4096
2008-07-28 23:32:00 +02:00
.gitignore
Update kernel/.gitignore with new auto-generated files
2008-02-09 23:27:01 -08:00
acct.c
bsdacct: fix and add comments around acct_process()
2008-07-25 10:53:47 -07:00
audit_tree.c
[PATCH] list_for_each_rcu must die: audit
2008-05-17 03:30:23 -04:00
audit.c
[PATCH] Fix the bug of using AUDIT_STATUS_RATE_LIMIT when set fail, no error output.
2008-08-01 12:15:16 -04:00
audit.h
[PATCH 1/2] audit: move extern declarations to audit.h
2008-04-28 06:28:04 -04:00
auditfilter.c
Re: [PATCH] the loginuid field should be output in all AUDIT_CONFIG_CHANGE audit messages
2008-08-01 12:15:03 -04:00
auditsc.c
[PATCH] audit: Moved variable declaration to beginning of function
2008-09-01 23:06:45 -04:00
backtracetest.c
backtrace: replace timer with tasklet + completions
2008-06-27 18:09:16 +02:00
bounds.c
Add kbuild.h that contains common definitions for kbuild users
2008-04-29 08:06:29 -07:00
capability.c
security: Fix setting of PF_SUPERPRIV by __capable()
2008-08-14 22:59:43 +10:00
cgroup_debug.c
CGroup API files: move "releasable" to cgroup_debug subsystem
2008-04-29 08:06:09 -07:00
cgroup.c
cgroup: uninline cgroup_has_css_refs()
2008-07-30 09:41:44 -07:00
compat.c
ntp: support for TAI
2008-05-01 08:03:59 -07:00
configs.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
cpu.c
cpu hotplug: s390 doesn't support additional_cpus anymore.
2008-08-12 16:07:28 -07:00
cpuset.c
sched, cpuset: rework sched domains and CPU hotplug handling (v4)
2008-08-14 11:23:51 +02:00
delayacct.c
per-task-delay-accounting: update taskstats for memory reclaim delay
2008-07-25 10:53:47 -07:00
dma-coherent.c
DMA: make dma-coherent.c documentation kdoc-friendly
2008-08-07 06:52:01 -07:00
dma.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
exec_domain.c
[PATCH] kill altroot
2008-07-26 20:53:20 -04:00
exit.c
sched: fix process time monotonicity
2008-09-05 18:14:35 +02:00
extable.c
module: Don't report discarded init pages as kernel text.
2008-01-29 17:13:18 +11:00
fork.c
mmu-notifiers: core
2008-07-28 16:30:21 -07:00
futex_compat.c
futex_compat __user annotation
2008-03-30 14:18:41 -07:00
futex.c
futexes: fix fault handling in futex_lock_pi
2008-06-23 13:31:15 +02:00
hrtimer.c
Merge branch 'generic-ipi' into generic-ipi-for-linus
2008-07-15 21:55:59 +02:00
itimer.c
ITIMER_REAL: convert to use struct pid
2008-02-08 09:22:29 -08:00
kallsyms.c
kallsyms: fix potential overflow in binary search
2008-07-25 10:53:27 -07:00
Kconfig.hz
sched: fix SCHED_HRTICK dependency
2008-07-28 14:37:38 +02:00
Kconfig.preempt
rcu: move PREEMPT_RCU config option back under PREEMPT
2008-03-10 18:01:20 -07:00
kexec.c
kexec: use a mutex for locking rather than xchg()
2008-08-15 08:35:43 -07:00
kfifo.c
…
kgdb.c
kgdb: fix gdb serial thread queries
2008-08-01 08:39:35 -05:00
kmod.c
call_usermodehelper(): increase reliability
2008-07-25 10:53:28 -07:00
kprobes.c
kprobes: remove redundant config check
2008-07-25 10:53:30 -07:00
ksysfs.c
Kobject: convert remaining kobject_unregister() to kobject_put()
2008-01-24 20:40:40 -08:00
kthread.c
tracehook: wait_task_inactive
2008-07-26 12:00:09 -07:00
latencytop.c
kernel: use non-racy method for proc entries creation
2008-04-29 08:06:22 -07:00
lockdep_internals.h
lockdep: build fix
2008-08-13 12:55:10 +02:00
lockdep_proc.c
lockstat: fix numerical output rounding error
2008-08-26 10:37:46 +02:00
lockdep.c
lockdep: fix invalid list_del_rcu in zap_class
2008-08-27 08:40:36 +02:00
Makefile
Merge branch 'linus' into core/generic-dma-coherent
2008-07-29 00:07:55 +02:00
marker.c
markers: fix markers read barrier for multiple probes
2008-07-30 09:41:45 -07:00
module.c
[module] Don't let gcc inline load_module()
2008-08-25 11:10:26 -07:00
mutex-debug.c
mutex-debug: check mutex magic before owner
2008-05-16 16:53:35 +02:00
mutex-debug.h
…
mutex.c
locking: fix mutex @key parameter kernel-doc notation
2008-07-28 18:12:36 +02:00
mutex.h
…
notifier.c
ipc: re-enable msgmni automatic recomputing msgmni if set to negative
2008-04-29 08:06:13 -07:00
ns_cgroup.c
cgroup_clone: use pid of newly created task for new cgroup
2008-07-25 10:53:37 -07:00
nsproxy.c
removed unused #include <linux/version.h>'s
2008-08-23 12:14:12 -07:00
panic.c
Add a WARN() macro; this is WARN_ON() + printk arguments
2008-07-25 10:53:29 -07:00
params.c
Add new string functions strict_strto* and convert kernel params to use them
2008-02-08 09:22:41 -08:00
pid_namespace.c
pid_ns: (BUG 11391) change ->child_reaper when init->group_leader exits
2008-09-02 19:21:38 -07:00
pid.c
pidns: remove now unused find_pid function.
2008-07-25 10:53:45 -07:00
pm_qos_params.c
pm_qos_requirement might sleep
2008-09-02 19:21:40 -07:00
posix-cpu-timers.c
posix-timers: print RT watchdog message
2008-05-24 18:49:22 +02:00
posix-timers.c
Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2008-08-11 16:46:11 -07:00
printk.c
printk: fix comment for printk ratelimiting
2008-07-30 09:41:45 -07:00
profile.c
build kernel/profile.o only when requested
2008-07-25 10:53:27 -07:00
ptrace.c
security: Fix setting of PF_SUPERPRIV by __capable()
2008-08-14 22:59:43 +10:00
rcuclassic.c
stop_machine: Wean existing callers off stop_machine_run()
2008-07-28 12:16:31 +10:00
rcupdate.c
rcu: fix synchronize_rcu() so that kernel-doc works
2008-08-21 09:31:44 +02:00
rcupreempt_trace.c
rcu: remove duplicated include in kernel/rcupreempt_trace.c
2008-05-19 10:03:39 +02:00
rcupreempt.c
Merge branch 'linus' into cpus4096
2008-07-16 00:29:07 +02:00
rcutorture.c
rcu: make rcutorture even more vicious: invoke RCU readers from irq handlers (timers)
2008-06-26 09:24:33 +02:00
relay.c
relay: fix "full buffer with exactly full last subbuffer" accounting problem
2008-08-05 14:33:46 -07:00
res_counter.c
cgroup files: convert res_counter_write() to be a cgroups write_string() handler
2008-07-25 10:53:36 -07:00
resource.c
kernel/resource.c: fix new kernel-doc warning
2008-09-02 10:47:30 -07:00
rtmutex_common.h
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
rtmutex-debug.c
Don't operate with pid_t in rtmutex tester
2008-02-08 09:22:41 -08:00
rtmutex-debug.h
…
rtmutex-tester.c
sysdev: Pass the attribute to the low level sysdev show/store function
2008-07-21 21:55:02 -07:00
rtmutex.c
hrtimer: more hrtimer_init_sleeper() fallout.
2008-02-13 15:45:36 +01:00
rtmutex.h
…
rwsem.c
sched: mark rwsem functions as __sched for wchan/profiling
2007-12-18 15:21:13 +01:00
sched_clock.c
sched_clock: fix cpu_clock()
2008-08-25 17:39:57 +02:00
sched_cpupri.c
sched: use a 2-d bitmap for searching lowest-pri CPU
2008-06-06 15:19:28 +02:00
sched_cpupri.h
sched: fix the cpuprio count really
2008-06-06 15:19:44 +02:00
sched_debug.c
sched: add full schedstats to /proc/sched_debug
2008-06-27 14:31:31 +02:00
sched_fair.c
sched: fix mysql+oltp regression
2008-08-11 14:49:29 +02:00
sched_features.h
sched: enable LB_BIAS by default
2008-08-21 08:18:02 +02:00
sched_idletask.c
sched: make rt_sched_class, idle_sched_class static
2008-05-05 23:56:17 +02:00
sched_rt.c
sched: fix 2.6.27-rc5 couldn't boot on tulsa machine randomly
2008-09-11 09:34:28 +02:00
sched_stats.h
sched: fix accounting in task delay accounting & migration
2008-07-04 12:50:23 +02:00
sched.c
sched: fix deadlock in setting scheduler parameter to zero
2008-09-11 09:39:18 +02:00
seccomp.c
…
semaphore.c
semaphore: __down_common: use signal_pending_state()
2008-08-05 14:33:47 -07:00
signal.c
tracehook: fix SA_NOCLDWAIT
2008-08-19 20:37:07 -07:00
smp.c
smp: have smp_call_function_single() detect invalid CPUs
2008-08-25 17:45:48 -07:00
softirq.c
Full conversion to early_initcall() interface, remove old interface
2008-07-26 12:00:04 -07:00
softlockup.c
softlockup: minor cleanup, don't check task->state twice
2008-09-02 10:49:51 -07:00
spinlock.c
lockdep: spin_lock_nest_lock(), checkpatch fixes
2008-08-13 13:56:51 +02:00
srcu.c
make srcu_readers_active() static
2008-02-06 10:41:02 -08:00
stacktrace.c
stacktrace: fix modular build, export print_stack_trace and save_stack_trace
2008-06-30 09:20:55 +02:00
stop_machine.c
stop_machine: remove unused variable
2008-08-12 17:52:55 +10:00
sys_ni.c
signalfd: fix undefined reference to `compat_sys_signalfd4' when !CONFIG_SIGNALFD
2008-07-25 11:35:41 -07:00
sys.c
fix setpriority(PRIO_PGRP) thread iterator breakage
2008-08-20 15:40:32 -07:00
sysctl_check.c
sysctl: check for bogus modes
2008-07-25 10:53:45 -07:00
sysctl.c
forgotten refcount on sysctl root table
2008-09-04 11:06:21 -07:00
taskstats.c
taskstats: remove initialization of static per-cpu variable
2008-07-25 10:53:47 -07:00
test_kprobes.c
kprobes: kretprobe user entry-handler
2008-02-06 10:41:11 -08:00
time.c
Make constants in kernel/timeconst.h fixed 64 bits
2008-05-02 16:18:42 -07:00
timeconst.pl
Make constants in kernel/timeconst.h fixed 64 bits
2008-05-02 16:18:42 -07:00
timer.c
Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
2008-07-14 16:06:58 -07:00
tsacct.c
task IO accounting: move all IO statistics in struct task_io_accounting
2008-07-27 16:12:28 -07:00
uid16.c
asmlinkage_protect replaces prevent_tail_call
2008-04-10 17:28:26 -07:00
user_namespace.c
removed unused #include <linux/version.h>'s
2008-08-23 12:14:12 -07:00
user.c
alloc_uid: cleanup
2008-04-30 08:29:53 -07:00
utsname_sysctl.c
removed unused #include <linux/version.h>'s
2008-08-23 12:14:12 -07:00
utsname.c
removed unused #include <linux/version.h>'s
2008-08-23 12:14:12 -07:00
wait.c
kernel: remove fastcall in kernel/*
2008-02-08 09:22:31 -08:00
workqueue.c
Merge branch 'core/locking' into core/urgent
2008-08-12 00:11:49 +02:00