<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial">I does not receive your reply, probably because of firewall, or because I am not the subscribe of crash-utility@redhat.com. Thanks for your reply. Could you show me a result of "./crash -d 5" and Fedora kernel .config? Thanks very much. My result is: crash: get_cpus_online: online: 2 GNU_GET_DATATYPE[irq_desc_t]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[hw_interrupt_type]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[timer_vec_root]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[timer_vec]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[tvec_root_s]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[softirq_state]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[desc_struct]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[kallsyms_header]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[mem_section]: returned via gdb_error_hook (1 buffer in use) <readmem: c000000000922930, KVADDR, "cpu_possible_mask", 8, (FOE), fc5b5934d10> <read_dev_mem: addr: c000000000922930 paddr: 922930 cnt: 8> <readmem: c000000000922930, KVADDR, "cpu_possible_mask", 8, (FOE), fc5b5934c90> <read_dev_mem: addr: c000000000922930 paddr: 922930 cnt: 8> <readmem: c000000000922930, KVADDR, "cpu_possible_mask", 8, (FOE), fc5b5934c90> <read_dev_mem: addr: c000000000922930 paddr: 922930 cnt: 8> <readmem: c000000000922930, KVADDR, "cpu_possible_mask", 8, (FOE), fc5b5934c90> <read_dev_mem: addr: c000000000922930 paddr: 922930 cnt: 8> <readmem: c000000000922930, KVADDR, "cpu_possible_mask", 8, (FOE), fc5b5934c90> <read_dev_mem: addr: c000000000922930 paddr: 922930 cnt: 8> GNU_GET_DATATYPE[irqdesc]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[irq_desc_t]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[RESIDUAL]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[VPD]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[bd_info]: returned via gdb_error_hook (1 buffer in use) <readmem: c000000001019ab8, KVADDR, "nr_irqs", 4, (FOE), 108bf934> <read_dev_mem: addr: c000000001019ab8 paddr: 1019ab8 cnt: 4> GNU_GET_DATATYPE[kmem_slab_s]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[slab_s]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[slab]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[kmem_cache_s]: returned via gdb_error_hook (1 buffer in use) GNU_PASS_THROUGH: returned via gdb_error_hook (1 buffer in use) GNU_PASS_THROUGH: returned via gdb_error_hook (1 buffer in use) <readmem: c0000000012430d8, KVADDR, "high_memory", 8, (FOE), 108c4be8> <read_dev_mem: addr: c0000000012430d8 paddr: 12430d8 cnt: 8> <readmem: c0000000012430b0, KVADDR, "mem_map", 8, (FOE), 108c4bf8> <read_dev_mem: addr: c0000000012430b0 paddr: 12430b0 cnt: 8> <readmem: c000000001243140, KVADDR, "vmlist", 8, (FOE), fc5b59340e8> <read_dev_mem: addr: c000000001243140 paddr: 1243140 cnt: 8> <readmem: c0000000fb198008, KVADDR, "first vmlist addr", 8, (ROE), fc5b59340e0> <read_dev_mem: addr: c0000000fb198008 paddr: fb198008 cnt: 8> <readmem: c000000001197518, KVADDR, "totalram_pages", 8, (FOE), 108c4c08> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> <readmem: c00000000119d000, KVADDR, "level4 page", 4096, (FOE), 118c99b0> .... -Roy <pre>Fedora</pre> <div></div><div id="divNeteaseMailCard"></div> At 2013-01-24 19:42:01,"川煮裟" <lrq2001@163.com> wrote: <blockquote id="isReplyContent" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid"><div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial">crash can not exit from readmem() recursive until it is killed because of OOM or Segmentation fault on PPC64 cpu. readmem-->kvtop-->ppc64_vtop_level4-->readme-->kvtop.... root@localhost:~# uname -a Linux localhost 3.4.20 #2 SMP PREEMPT Thu Jan 24 14:43:59 CST 2013 ppc64 GNU/Linux root@localhost:~# root@localhost:~# crash crash 6.1.0 Copyright (C) 2002-2012 Red Hat, Inc. Copyright (C) 2004, 2005, 2006, 2010 IBM Corporation Copyright (C) 1999-2006 Hewlett-Packard Co Copyright (C) 2005, 2006, 2011, 2012 Fujitsu Limited Copyright (C) 2006, 2007 VA Linux Systems Japan K.K. Copyright (C) 2005, 2011 NEC Corporation Copyright (C) 1999, 2002, 2007 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 (GDB) 7.3.1 Copyright (C) 2011 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "powerpc64-wrs-linux"... Segmentation fault (core dumped) root@localhost:~# gdb /usr/bin/crash core GNU gdb (Linux Sourcery CodeBench 4.6a-98) 7.4.50.20120716-cvs Copyright (C) 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "powerpc64-wrs-linux-gnu". For bug reporting instructions, please see: <<a href="mailto:support@codesource.com">support@codesource.com</a>>... Reading symbols from /usr/bin/crash...Reading symbols from /usr/bin/.debug/crash...done. done. [New LWP 1166] warning: Could not load shared library symbols for linux-vdso64.so.1. Do you need "set solib-search-path" or "set sysroot"? Core was generated by `crash '. Program terminated with signal 11, Segmentation fault. #0 readmem (addr=13835058055299842048, memtype=1, buffer=0x10cbc460, size=4096, type=0x106eafe8 "level4 page", error_handle=1) at memory.c:1959 1959 { (gdb) bt #0 readmem (addr=13835058055299842048, memtype=1, buffer=0x10cbc460, size=4096, type=0x106eafe8 "level4 page", error_handle=1) at memory.c:1959 #1 0x000000001011a2e4 in ppc64_vtop_level4 (vaddr=13835058055299842048, level4=0xc0000000010dc000, paddr=0xfffe73ed1d8, verbose=<optimized out>) at ppc64.c:561 #2 0x0000000010097264 in kvtop (tc=<optimized out>, kvaddr=<error reading variable: value has been optimized out>, paddr=<optimized out>, verbose=<error reading variable: value has been optimized out>) at memory.c:2765 #3 0x000000001009895c in readmem (addr=13835058055299842048, memtype=<optimized out>, buffer=<optimized out>, size=<optimized out>, type=0x106eafe8 "level4 page", error_handle=1) at memory.c:2032 #4 0x000000001011a2e4 in ppc64_vtop_level4 (vaddr=13835058055299842048, level4=0xc0000000010dc000, paddr=0xfffe73ed418, verbose=<optimized out>) at ppc64.c:561 #5 0x0000000010097264 in kvtop (tc=<optimized out>, kvaddr=<error reading variable: value has been optimized out>, paddr=<optimized out>, verbose=<error reading variable: value has been optimized out>) at memory.c:2765 #6 0x000000001009895c in readmem (addr=13835058055299842048, memtype=<optimized out>, buffer=<optimized out>, size=<optimized out>, ---Type <return> to continue, or q <return> to quit---quit type=Quit (gdb) quit </div> </blockquote></div>