My system produced a kernel WARNING involving a traceback

Issue

Red Hat Enterprise Linux 6.x gives a kernel WARNING, including a call trace.

Sample message:

WARNING: at /builddir/build/BUILD/kernel-2.6.32-122.el6/linux-2.6.32-122.el6.x86_64/arch/x86/include/asm/processor.h:993 read_measured_perf_ctrs+0x78/0x90 [acpi_cpufreq]() (Tainted: G        W  ----------------  )
Hardware name: redacted
Modules linked in: cpufreq_ondemand acpi_cpufreq freq_table ipv6 dm_mirror dm_region_hash dm_log microcode i2c_i801 i2c_core serio_raw iTCO_wdt  iTCO_vendor_support ioatdma i7core_edac edac_core igb ixgbe dca mdio sg ext4 mbcache jbd2 sd_mod crc_t10dif ahci mptsas mptscsih mptbase scsi_transport_sas dm_mod [last unloaded: scsi_wait_scan]
Pid: 1407, comm: kondemand/1 Tainted: G        W  ----------------   2.6.32-122.el6.x86_64 #1
Call Trace:
[<ffffffff81066ee7>] ? warn_slowpath_common+0x87/0xc0
[<ffffffff81066f3a>] ? warn_slowpath_null+0x1a/0x20
[<ffffffffa02589b8>] ? read_measured_perf_ctrs+0x78/0x90 [acpi_cpufreq]
[<ffffffffa0258940>] ? read_measured_perf_ctrs+0x0/0x90 [acpi_cpufreq]
[<ffffffff810a40b0>] ? smp_call_function_single+0x90/0x160
[<ffffffff8126396a>] ? kobject_get+0x1a/0x30
[<ffffffffa025847c>] ? get_measured_perf+0x2c/0xa0 [acpi_cpufreq]
[<ffffffff813e88e8>] ? __cpufreq_driver_getavg+0x78/0x80
[<ffffffffa0262031>] ? do_dbs_timer+0xf1/0x384 [cpufreq_ondemand]
[<ffffffffa0261f40>] ? do_dbs_timer+0x0/0x384 [cpufreq_ondemand]
[<ffffffff810885d0>] ? worker_thread+0x170/0x2a0
[<ffffffff8108df00>] ? autoremove_wake_function+0x0/0x40
[<ffffffff81088460>] ? worker_thread+0x0/0x2a0
[<ffffffff8108db96>] ? kthread+0x96/0xa0
[<ffffffff8100c1ca>] ? child_rip+0xa/0x20
[<ffffffff8108db00>] ? kthread+0x0/0xa0
[<ffffffff8100c1c0>] ? child_rip+0x0/0x20
---[ end trace 319f55649a74e8ed ]---

Note: this article discusses kernel WARNINGs in general; for details on this specific WARNING, refer to My system produced a kernel WARNING involving a traceback with "read_measured_perf_ctrs".