[Crash-utility] Re: backtrace problem with crash 0.2.18 on 2.6.14 vanilia kernel ia64

Hello, I built crash 4.0-2.18 on ia64 platform and run it on a vanilla 2.6.14 running kernel. It starts OK, and has some commands working. Unfortunately, it seems that the backtrace command does not do anything (calls unwind_v3(), but does nothing) on a live system. I just typed: bt 1 to get the init task backtrace (sleeping state). crash is very usefull to have such informations on a live system. Do you have any idea ? Thanks in advance. Xavier [root@pf37a xb]# bin/crash vmlinux-2.6.14 crash 4.0-2.18 Copyright (C) 2002, 2003, 2004, 2005, 2006 Red Hat, Inc. Copyright (C) 2004, 2005, 2006 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005 Fujitsu Limited Copyright (C) 2005 NEC Corporation Copyright (C) 1999, 2002 Silicon Graphics, Inc. Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc. This program is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Enter "help copying" to see the conditions. This program has absolutely no warranty. Enter "help warranty" for details. GNU gdb 6.1 Copyright 2004 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "ia64-unknown-linux-gnu"... unwind_init_v3 KERNEL: vmlinux-2.6.14 DUMPFILE: /dev/mem CPUS: 6 DATE: Mon Jan 9 19:14:18 2006 UPTIME: 48 days, 13:04:50 LOAD AVERAGE: 0.26, 0.30, 0.14 TASKS: 125 NODENAME: pf37a RELEASE: 2.6.14 VERSION: #1 SMP Mon Nov 21 13:27:22 CET 2005 MACHINE: ia64 (1600 Mhz) MEMORY: 31.9 GB PID: 7592 COMMAND: "crash" TASK: e00000012c8a0000 [THREAD_INFO: e00000012c8a0d60] CPU: 0 STATE: TASK_RUNNING (ACTIVE) crash> bt PID: 7592 TASK: e00000012c8a0000 CPU: 0 COMMAND: "crash" (active) crash> bt 1 PID: 1 TASK: e0000023ff220000 CPU: 0 COMMAND: "init" crash> crash> help -m flags: 8000352 (NEW_UNWIND|NEW_UNW_V3|UNW_READ|UNW_PTREGS|UNW_R0|D EVMEMRD) kvbase: a000000000000000 identity_map_base: e000000000000000 pagesize: 65536 pageshift: 16 pagemask: ffffffffffff0000 pageoffset: ffff stacksize: 32768 hz: 1024 mhz: 1024 memsize: 34269102080 (0x7fa990000) bits: 64 nr_irqs: 256 eframe_search: ia64_eframe_search() back_trace: ia64_back_trace_cmd() get_processor_speed: ia64_processor_speed() uvtop: ia64_uvtop() kvtop: ia64_kvtop() get_task_pgd: ia64_get_task_pgd() dump_irq: ia64_dump_irq() get_stack_frame: ia64_get_stack_frame() get_stackbase: ia64_get_stackbase() get_stacktop: ia64_get_stacktop() translate_pte: ia64_translate_pte() memory_size: generic_memory_size() vmalloc_start: ia64_vmalloc_start() is_task_addr: ia64_is_task_addr() verify_symbol: ia64_verify_symbol() dis_filter: ia64_dis_filter() cmd_mach: ia64_cmd_mach() get_smp_cpus: ia64_get_smp_cpus() is_kvaddr: generic_is_kvaddr() is_uvaddr: generic_is_uvaddr() verify_paddr: ia64_verify_paddr() init_kernel_pgd: NULL value_to_symbol: generic_machdep_value_to_symbol() line_number_hooks: ia64_line_number_hooks last_pgd_read: 0 last_pmd_read: 0 last_ptbl_read: 0 pgd: 600000000013a650 pmd: 600000000014a660 ptbl: 600000000015a670 ptrs_per_pgd: 8192 cmdline_arg: (null) machspec: ia64_machine_specific cpu_data_address: e000000004b00030 unimpl_va_mask: 0 unimpl_pa_mask: 7ffc000000000000 unw: 60000000000de800 unw_tables_offset: 8 unw_kernel_table_offset: 288 unw_pt_regs_offsets: 224 script_index: 0 script_cache: 600000000a96c9e0 0% (0 of 0) mem_limit: 0 kernel_region: 5 kernel_start: a000000100000000 phys_start: 4008320 (4000000) vmalloc_start: a000000200000000 ia64_memmap: 6000000000ab3780 efi_memmap_size: 1728 efi_memdesc_size: 48 unwind_init: unwind_init_v3() unwind: unwind_v3() dump_unwind_stats: dump_unwind_stats_v3() unwind_debug: unwind_debug_v3() ia64_init_stack_size: 0 crash> ps PID PPID CPU TASK ST %MEM VSZ RSS COMM 0 0 0 a000000100730000 RU 0.0 0 0 [swapper] > 0 1 1 e0000001039f0000 RU 0.0 0 0 [swapper] > 0 1 2 e000000103a20000 RU 0.0 0 0 [swapper] > 0 1 3 e000000103a40000 RU 0.0 0 0 [swapper] > 0 1 4 e000000103a60000 RU 0.0 0 0 [swapper] > 0 1 5 e000000103a80000 RU 0.0 0 0 [swapper] 1 0 1 e0000023ff220000 IN 0.0 5184 3648 init 2 1 0 e0000001039b0000 IN 0.0 0 0 [migration/0] 3 1 0 e0000023ff230000 IN 0.0 0 0 [ksoftirqd/0] 4 1 0 e0000001039d0000 IN 0.0 0 0 [watchdog/0] .....