My Linux box just crashed while performing some network related tests. I'm trying to analyze the kernel crash dump using "Crash" utility. Need your help in analyzing it. <<<Snip from crash output>>> # crash /usr/lib/debug/lib/modules/2.6.32-131.0.15.el6.x86_64/vmlinux vmcore .........versioning information here............... .................etc etc.......................... KERNEL: /usr/lib/debug/lib/modules/2.6.32-131.0.15.el6.x86_64/vmlinux DUMPFILE: vmcore [PARTIAL DUMP] CPUS: 32 DATE: Mon Sep 19 09:44:45 2011 <---- --- UPTIME: 2 days, 22:55:44 LOAD AVERAGE: 0.00, 0.02, 0.00 TASKS: 409 NODENAME: RHEL61ga RELEASE: 2.6.32-131.0.15.el6.x86_64 VERSION: #1 SMP Tue May 10 15:42:40 EDT 2011 MACHINE: x86_64 (2660 Mhz) MEMORY: 12 GB PANIC: "Oops: 0000 [#1] SMP " (check log for details) PID: 0 COMMAND: "swapper" TASK: ffffffff81a2d020 (1 of 8) [THREAD_INFO: ffffffff81a00000] CPU: 0 STATE: TASK_RUNNING (ACTIVE) WARNING: panic task not found ........................ stack trace frame 0 - frame 18 here..................... ............................................................................................... --- <IRQ stack> --- #19 [ffffffff81a01da8] ret_from_intr at ffffffff8100bad3 [exception RIP: acpi_check_resource_conflict+207] < ---- --- -------- RIP: ffffffff812bb86e RSP: ffffffff81a01e58 RFLAGS: 00000206 RAX: 0000000000000000 RBX: ffffffff81a01ec8 RCX: 0000000000000000 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 00000000000018f6 RBP: ffffffff8100bace R8: 0000000000000000 R9: 0000000000000ca3 R10: ffff88019aa061c2 R11: ffff88019aa06201 R12: ffffffff81b7c0b8 R13: 0000000000000001 R14: ffffffff810ece03 R15: ffffffff81a01dd8 ORIG_RAX: ffffffffffffffb5 CS: 0010 SS: 0018 #20 [ffffffff81a01e50] acpi_check_resource_conflict at ffffffff812bb851 #21 [ffffffff81a01ed0] show_current_driver at ffffffff813eccb7 #22 [ffffffff81a01ef0] cpu_idle at ffffffff81009e96 <<<Snip from crash output>>> Observation: i) The panic hit at Sep 19 09:44:45 2011, and a peek inside /var/log/messages reveals that the machine was down for about 4-5 minutes around this timestamp. But there are no other relevant information available in the log file, so as printed in the panic string above: "Oops: 0000 [#1] SMP " (check log for details)", where else should i look for logs ? ii) Does frame 19:: [exception RIP: acpi_check_resource_conflict+207] and the immediated dump of the registers of my machine(Mine is x86_64) is an indication of where the Oops occured ? iii) Disassembly of "acpi_check_resource_conflict" at an offset:207 shows a 'test' instruction being carried out on CPU 0: 0xffffffff812bb86e <acpi_check_resource_conflict+207>: test %ebx,0xc4c3e8(%rip) # 0xffffffff81f07c5c iv) I belive that on 64 bit x86 machines, RIP represents EIP and similarly RBX represents EBX register. hence at the time of panic, the contents fo these registers were as follows: RBX = ffffffff81a01ec8 RIP = ffffffff812bb86e I don't know much of assembly, just did little bit of search on web, and my understanding is that the instruction "test %ebx,0xc4c3e8(%rip)" tells the processor to do the bitwise "and" of contents of ebx register with the value at the offset:0xc4c3e8 from the base address pointed by rip. i.e. ffffffff812bb86e+c4c3e8 = FFFFFFFF81F07C56 ? Please correct me if I'm wrong. -Amit