https://bugzilla.novell.com/show_bug.cgi?id=741784 https://bugzilla.novell.com/show_bug.cgi?id=741784#c0 Summary: Enabling hyper threading leads to random freezes during boot up Classification: openSUSE Product: openSUSE 12.1 Version: Final Platform: i686 OS/Version: SuSE Other Status: NEW Severity: Critical Priority: P5 - None Component: Kernel AssignedTo: kernel-maintainers@forge.provo.novell.com ReportedBy: choroba@matfyz.cz QAContact: qa@suse.de Found By: --- Blocker: --- User-Agent: Mozilla/5.0 (X11; Linux i686; rv:9.0.1) Gecko/20100101 Firefox/9.0.1 When booting kernel-default, kernel-desktop, or kernel-vanilla, enabling hyper threading leads to random freezes during bootup. Sometimes, messages are displayed (often incomplete) like "BUG: unable to handle kernel initcall acpi_processor_init +0x0/0x100 [processor] returned with preemption imbalance" or "BUG: unable to handle kernel paging request" or "scheduling while atomig" or just plain SIGSEGV or kernel panic. The only working option is "acpi=off", but system cannot be powered off with it (it just halts). The workaround is to disable HT in BIOS, then booting is possible without any options, but with only 1 cpu. Switching to sysvinit in the boot screen does not help. Reproducible: Sometimes Steps to Reproduce: 1. Turn on/reboot the computer 2. Specify acpi=ht or similar on the init line 3. Wait. If system boots succesfully, return to 1. The failure is far more common than success. Actual Results: The system freezes at various stages, usualy around "hub usb" and "rtc" initialization. Expected Results: The system should boot up and run on both CPUs. The bug might be related to https://bugzilla.novell.com/show_bug.cgi?id=731595. Motherboard: D865PERL, BIOS updated around 2007 CPU: vendor_id : GenuineIntel cpu family : 15 model : 3 model name : Intel(R) Pentium(R) 4 CPU 2.80GHz stepping : 3 cpu MHz : 2793.155 cache size : 1024 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc up pebs bts pni dtes64 monitor ds_cpl cid bogomips : 5586.31 clflush size : 64 cache_alignment : 128 address sizes : 36 bits physical, 32 bits virtual power management: Memory: 2GB -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.