Xavier also mentioned in a private email that "foreach bt" shows nothing for all non-active tasks, so it appears that something has changed affecting the ia64 unwind facility. Has anybody else running ia64 on 2.6.14 kernels seen this? Thanks, Dave xb wrote: > 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] > ..... >
