From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.7.8) Gecko/20050512 Red Hat/1.7.8-1.1.3.1 Description of problem: We are getting the following kernel panic early during boot: Unable to handle kernel NULL pointer dereference at 0000000000000002 RIP: <ffffffff80241567>{acpi_pci_root_add+296} PML4 7fdcc067 PGD 0 Oops: 0000 [1] CPU 0 Modules linked in: Pid: 1, comm: swapper Not tainted 2.6.9-11.EL RIP: 0010:[<ffffffff80241567>] <ffffffff80241567>{acpi_pci_root_add+296} RSP: 0018:000001007ff83e08 EFLAGS: 00010206 RAX: 0000000000ff0002 RBX: 000001007fdbb2c0 RCX: ffffffff804d478c RDX: 0000000000000002 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 000001007ffde828 R10: 0000000000000000 R11: 0000000000000000 R12: 00000100065a6c00 R13: ffffffff80432320 R14: 0000000000000000 R15: 0000010037ff0f00 FS: 0000000000000000(0000) GS:ffffffff8051e980(0000) knlGS:0000000000000000 CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b CR2: 0000000000000002 CR3: 0000000000101000 CR4: 00000000000006e0 Process swapper (pid: 1, threadinfo 000001007ff82000, task 000001007ff81110) Stack: 000000000000001a 0000000000000000 0000000000000000 00000000000000ff ffffffff80431d00 00000100065a6c00 ffffffff80431d00 ffffffff80245f64 ffffffff80431d00 00000100065a6c00 Call Trace:<ffffffff80245f64>{acpi_bus_driver_init+49} <ffffffff802471be>{acpi_bus_add+2715} <ffffffff80226639>{acpi_os_wait_semaphore+133} <ffffffff8023c7e4>{acpi_ut_acquire_mutex+114} <ffffffff80539506>{acpi_scan_init+450} <ffffffff8010c3d9>{init+336} <ffffffff80111373>{child_rip+8} <ffffffff8010c289>{init+0} <ffffffff8011136b>{child_rip+0} Code: 48 8b 02 0f 18 08 48 81 fa 10 1e 43 80 74 68 8b 43 18 39 42 RIP <ffffffff80241567>{acpi_pci_root_add+296} RSP <000001007ff83e08> CR2: 0000000000000002 <0>Kernel panic - not syncing: Oops The system is a HP xw9300 Dual-Opteron workstation with 4 GB RAM, NVIDIA QuadroFX 3400, LSI Logic 53c1030, System bios v1.21 786B9 The system crashes with a smp kernel because of Bug #160135 (with and without acpi=off - please see my oopses there). With a uni-processor kernel it only boots with the kernel argument apci=off. Without it we get the oops above. Version-Release number of selected component (if applicable): kernel-2.6.9-11.EL How reproducible: Always Steps to Reproduce: 1. Boot uni-processor kernel-2.6.9-11.EL (without acpi=off) 2. 3. Actual Results: oops Expected Results: no kernel panic Additional info: Because of this bug and #160135 we currently are only able to use a single CPU and no ACPI on this workstation.
*** This bug has been marked as a duplicate of 163337 ***