Most recent kernel where this bug did not occur: Distribution: Fedora Core 6 Hardware Environment: Intel Server Board with dual core Xeon CPU 2.8 GHz Software Environment: 64Bit ! Problem Description: acpi-cpufreq: CPU0 - ACPI performance management activated. acpi-cpufreq: CPU1 - ACPI performance management activated. acpi-cpufreq: CPU2 - ACPI performance management activated. acpi-cpufreq: CPU3 - ACPI performance management activated. acpi-cpufreq: CPU4 - ACPI performance management activated. acpi-cpufreq: CPU5 - ACPI performance management activated. acpi-cpufreq: CPU6 - ACPI performance management activated. acpi-cpufreq: CPU7 - ACPI performance management activated. BUG: warning at kernel/cpu.c:56/unlock_cpu_hotplug() (Not tainted) Call Trace: [<ffffffff8026929b>] show_trace+0x34/0x47 [<ffffffff802692c0>] dump_stack+0x12/0x17 [<ffffffff802a044f>] unlock_cpu_hotplug+0x47/0x74 [<ffffffff803fee80>] store_speed+0xbf/0xcc [<ffffffff8026f992>] store+0x44/0x5b [<ffffffff802fb1ac>] sysfs_write_file+0xca/0xf9 [<ffffffff802162b6>] vfs_write+0xce/0x174 [<ffffffff80216b26>] sys_write+0x45/0x6e [<ffffffff8025c00e>] system_call+0x7e/0x83 DWARF2 unwinder stuck at system_call+0x7e/0x83 Leftover inexact backtrace: BUG: warning at kernel/cpu.c:56/unlock_cpu_hotplug() (Not tainted) Call Trace: [<ffffffff8026929b>] show_trace+0x34/0x47 [<ffffffff802692c0>] dump_stack+0x12/0x17 [<ffffffff802a044f>] unlock_cpu_hotplug+0x47/0x74 [<ffffffff803fee80>] store_speed+0xbf/0xcc [<ffffffff8026f992>] store+0x44/0x5b [<ffffffff802fb1ac>] sysfs_write_file+0xca/0xf9 [<ffffffff802162b6>] vfs_write+0xce/0x174 [<ffffffff80216b26>] sys_write+0x45/0x6e [<ffffffff8025c00e>] system_call+0x7e/0x83 DWARF2 unwinder stuck at system_call+0x7e/0x83 Leftover inexact backtrace: Steps to reproduce: only boot the system :-)
Can you try 2.6.20-rc2? I had this similar errors with same FC6 kernel. The errors are no longer there since I upgraded to 2.6.20-rc2.
Please reopen this bug if it's still present with kernel 2.6.20.
I have test it and it's running fine ! thanks ! have test with the new suse kernel : Linux version 2.6.20-2-default (geeko@buildhost) (gcc version 4.1.2 20070115 (prerelease) (SUSE Linux)) #1 SMP Wed Feb 7 21:04:19 UTC 2007