#37 — BUG: using smp_processor_id() in preemptible code

State	Rejected
Version:
Area	Zen-Stable Releases/GIT
Issue type	Bug
Severity	Medium
Submitted by	ettlz
Submitted on	Jul 08, 2010
Responsible	Steven Barrett
Target release:	2.6.34-zen

Return to tracker

Caught this in 2.6.34-zen2:

BUG: using smp_processor_id() in preemptible [00000000] code: S13cpuspeed/1124
caller is nr_iowait_cpu+0x15/0x2b
Pid: 1124, comm: S13cpuspeed Not tainted 2.6.34-zen2-rhapsody.bfs.bfq-190 #3
Call Trace:
[<ffffffff812073eb>] debug_smp_processor_id+0xd7/0xf0
[<ffffffff81033460>] nr_iowait_cpu+0x15/0x2b
[<ffffffff81065065>] update_ts_time_stats+0x37/0x72
[<ffffffff810101b5>] ? read_tsc+0x9/0x1b
[<ffffffff8106088f>] ? ktime_get+0x60/0xb9
[<ffffffff81065230>] get_cpu_idle_time_us+0x44/0x63
[<ffffffffa01f8472>] get_cpu_idle_time+0x1c/0xa4 [cpufreq_ondemand]
[<ffffffffa01f8c0c>] cpufreq_governor_dbs+0xc8/0x318 [cpufreq_ondemand]
[<ffffffff813583b3>] __cpufreq_governor+0x84/0xc1
[<ffffffff8135915a>] __cpufreq_set_policy+0x1a8/0x222
[<ffffffff81359611>] store_scaling_governor+0x19b/0x1e9
[<ffffffff81359884>] ? handle_update+0x0/0x34
[<ffffffff81427600>] ? hrtimer_nanosleep_restart+0x7d/0x87
[<ffffffff81358f90>] store+0x56/0x78
[<ffffffff8114b2fc>] sysfs_write_file+0x105/0x141
[<ffffffff810f599a>] vfs_write+0xa9/0x106
[<ffffffff810f5aad>] sys_write+0x45/0x69
[<ffffffff81009b82>] system_call_fastpath+0x16/0x1b

.config attached.