The following is a new Oops found on x86_64 (both AMD64 and EM64t), but not on x86_32 or ia64. It occurs during boot. I'm wondering if perhaps it is a cpu hotplug related issue since it occurs on both architectures right after switching to SMP, and due to the reference to _cpu_up in the call traces? 2.6.19-rc1 booted without this issue, so I'm guessing it is due to a change within the past couple days. (I wasn't able to get 2.6.19-rc1-git1 to boot on any architecture, but assume this is already known and fixed, since it works now on some arch's.) The .configs and console logs are here: AMD64: http://crucible.osdl.org/runs/2456/sysinfo/amd01.config http://crucible.osdl.org/runs/2456/sysinfo/amd01.console EM64t: http://crucible.osdl.org/runs/2459/sysinfo/nfs12.config http://crucible.osdl.org/runs/2459/sysinfo/nfs12.console Here's a snippet from the AMD log (the EM64T log is similar): Linux version 2.6.19-rc1-git2 (root at amd01) (gcc version 3.4.6 (Gentoo 3.4.6-r1, ssp-3.4.5-1.0, pie-8.7.9)) #1 SMP PREEMPT Fri Oct 6 20:03:57 GMT 2006 Command line: root=/dev/sda3 profile=2 console=tty0 console=ttyS0,115200 BIOS-provided physical RAM map: BIOS-e820: 0000000000000000 - 000000000009fc00 (usable) BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) BIOS-e820: 00000000000e0000 - 00000000001000000: 000000007fff0000 - 000000007ffff000 (ACPI data) BIOS-e820: 000000007ffff000 - 0000000080000000 (ACPI NVS) BIOS-e820: 00000000ff7c0000 - 0000000100000000 (reserved) end_pfn_map = 1048576 DMI 2.3 present. SRAT: PXM 0 -> APIC 0 -> Node 0 SRAT: PXM 1 -> APIC 1 -> Node 1 SRAT: Node 0 PXM 0 100000-40000000 SRAT: Node 1 PXM 1 40000000-80000000 SRAT: Node 0 PXM 0 0-40000000 Boong to SMP code Unable to handle kernel NULL pointer dereference at 0000000000000088 RIP: [<ffffffff80231b1a>] profile_tick+0x30/0x65 PGD 0 Oops: 0000 [1] PREEMPT SMP CPU 0 Modules linked in: Pid: 1, comm: swapper Not tainted 2.6.19-rc1-git2 #1 RIP: 0010:[<ffffffff80231b1a>] [<ffffffff80231b1a>] profile_tick+0x30/0x65 RSP: 0000:ffffffff8074cf78 EFLAGS: 00010046 RAX: 00000000000000 RCX: ffffffff806fd658 RDX: ffff8100808c6f40 RSI: 0000000000000213 RDI: 0000000000000001 RBP: 0000000000000001 R08: 0000000000000017 R09: 0000000000000001 R10: 0000000000000001 R11: ffffffff803e1f93 R12: 0000000000000001 R13: 0000000000000001 R14: ffffffff806e3080 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffffffff806e3000(0000) knlGS:0000000000000000 CS: 000016e1d20 ffffffff8021898e ffff8100016e1fd8 ffffffff802189fd ffff81007f1b8b40 ffffffff8020a256 ffff8100016e1d20 <EOI> 0000000000000001 ffffffff803e1f93 0000000000000001 Call Trace: <IRQ> [<ffffffff8021898e>] smp_local_timer_interrupt+0xb/0x51 [<ffffffff802189fd>] smp_apic_timer_interrupt+0x29/0x2f [<ffffffff8020a256>] apic_timer_interrupt+0x66/0x70 <EOI> [<ffffffff803e1f93>] vgacon_cursor+0x0/0x1a7 [<ffffffff80561901>] __lock_text_start+0x9/0x2e [<ffffffff80217bbb>] __cpu_up+0x235/0x726 [<ffffffff8026e56a>] __cache_alloc_node+0x11c/0x12b [<ffffffff8021796a>] do_fork_idle+0x0/0x1c [<ffffffff802491cc>] _cpu_up+0x79/0xc7 [<ffffffff80249240>] cpu_up+0x26/0x3a [<ffffffff802070ee>] init+0x96/0x30c [<ffffffff80561d51>] _spin_unlock_irq+0x12/0x2d [<fffffff80228868>] schedule_tail+0x36/0x9a [<ffffffff803e1f93>] vgacon_cursor+0x0/0x1a7 [<ffffffff8020a445>] child_rip+0xa/0x15 [<ffffffff803e1f93>] vgacon_cursor+0x0/0x1a7 [<ffffffff803e1f93>] vgacon_cursor+0x0/0x1a7 [<ffffffff80207058>] init+0x0/0x30c [<ffffffff8020a43b>] child_rip+0x0/0x15 For comparison with other architectures and previous kernels: http://crucible.osdl.org/runs/hotplug_report.html Bryce
