Re: [Crash-utility] using crash for ARM

Hi, here is the log which I m trying from gdb now. hope this stack trace helps. ./gdb --args ./crash ./vmlinux ./System.map                                       < 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 "arm-none-linux-gnueabi". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /system/crash...done. (gdb) start Temporary breakpoint 1 at 0x8224: file main.c, line 78. Starting program: /system/crash ./vmlinux ./System.map Temporary breakpoint 1, main (argc=3, argv=0xbefffba4) at main.c:78 78      main.c: No such file or directory.         in main.c (gdb) bt #0  main (argc=3, argv=0xbefffba4) at main.c:78 (gdb) b open_tmpfile2 Breakpoint 2 at 0x6d46c: file filesys.c, line 1126. (gdb) c Continuing. crash 6.0.8 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 "arm-none-linux-gnueabi"... WARNING: kernels compiled by different gcc versions:   ./vmlinux: (unknown)   live system kernel: 4.4.3 Breakpoint 2, open_tmpfile2 () at filesys.c:1126 1126    filesys.c: No such file or directory.         in filesys.c (gdb) bt #0  open_tmpfile2 () at filesys.c:1126 #1  0x000f324c in anon_member_offset (name=0x433604 "page",     member=0x433680 "mapping") at symbols.c:5104 #2  0x000f2c4c in datatype_info (name=0x433604 "page",     member=0x433680 "mapping", dm=0xfffffffe) at symbols.c:4930 #3  0x000260f0 in vm_init () at memory.c:383 #4  0x0000b1a0 in main_loop () at main.c:644 #5  0x00173050 in current_interp_command_loop () at interps.c:288 #6  0x001749b0 in captured_command_loop (data=0x24) at ./main.c:228 #7  0x00172a50 in catch_errors (func=0x1749a8 <captured_command_loop>,     func_args=0x0, errstring=0x506b88 "", mask=<optimized out>)     at exceptions.c:531 #8  0x0017431c in captured_main (data=<optimized out>) at ./main.c:958 #9  0x00172a50 in catch_errors (func=0x173818 <captured_main>,     func_args=0xbefff9d8, errstring=0x506b88 "", mask=<optimized out>)     at exceptions.c:531 #10 0x00173628 in gdb_main (args=<optimized out>) at ./main.c:973 #11 gdb_main_entry (argc=<optimized out>, argv=<optimized out>)     at ./main.c:993 #12 0x000bed6c in gdb_main_loop (argc=2, argv=0xbefffba4)     at gdb_interface.c:76 #13 0x0000b014 in main (argc=3, argv=0xbefffba4) at main.c:604 (gdb) n 1129    in filesys.c (gdb) c Continuing. tmpfile: No such file or directory error no is 2 crash: cannot open secondary temporary file [/system/crash] error trace: f2c4c => f324c => 6d508 => 13138 crash: /usr/bin/nm: no such file DROP_CORE flag set: forcing a segmentation fault Program received signal SIGQUIT, Quit. 0x003be42c in kill () (gdb) PS: I am pretty sure that I am taking vmlinux from the same build and System.map as well, but that should not be a problem as long as crash had gone ahead. Regards, Oza. ________________________________ From: Dave Anderson <anderson(a)redhat.com&gt; To: paawan oza <paawan1982(a)yahoo.com&gt; Cc: "Discussion list for crash utility usage, maintenance and development" <crash-utility(a)redhat.com&gt; Sent: Friday, 10 August 2012 10:01 PM Subject: Re: [Crash-utility] using crash for ARM ----- Original Message ----- For starters, as Mika suggested, you should try your best to use the actual vmlinux file that is being run on the live system.  If the running kernel's vmlinux file does not have debuginfo data, and you are using a similar kernel along with the running kernel's System.map file, then you must be sure that the "other" vmlinux that you are using is as close as possible to the running kernel.  There are no guarantees that using a System.map file will work. Anyway, looking at the log file, I'm not sure why there's non-crash related data intermingled with the crash -d8 output, i.e., like this:   ...   c00dfc08 clk_enable   c00dfc50 clk_debug_set_enable   c00dfcac clk_[ 1866.844757] ##> wifi_suspend   [ 1866.856903] i2c i2c-1: mpu_dev_suspend, called regulator_disable. Status: 0   [ 1866.856933] mpu_dev_suspend: Suspend handler executed   [ 1866.872528] PM: suspend of devices complete after 27.886 msecs   [ 1866.872558] PM: suspend devices took 0.030 seconds   [ 1866.873077] PM: late suspend of devices complete after 0.457 msecs   [ 1866.873535] PM: early resume of devices complete after 0.183 msecs   [ 1866.874481] i2c i2c-1: mpu_dev_resume, called regulator_enable. Status: 0   [ 1866.874511] mpu_dev_resume: Resume handler executed   [ 1866.874572] wakeup wake lock: bcmpmu_i2c   [ 1866.874908] get_update_rate: rate = 112000   [ 1866.874938] get_update_rate: rate = 112000   [ 1866.876434] ##> wifi_resume   [ 1866.892822] PM: resume of devices complete after 19.007 msecs   [ 1866.893676] PM: resume devices took 0.020 seconds   reset   c00dfd4c clk_debug_reset   c00dfd90 clk_init   c00dfe10 clk_register   ... Regardless of that, I was looking for a readmem() call, or other debug statement that might help pinpoint the failure location.  The best that can be inferred from the log data are the GNU_GET_DATATYPE debug statements at the end: $ grep GNU_GET_DATATYPE teraterm.log GNU_GET_DATATYPE[runqueue]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[prio_array]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[prio_array]: returned via gdb_error_hook (1 buffer in use) GNU_GET_DATATYPE[prio_array]: 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[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) GNU_GET_DATATYPE[note_buf_t]: returned via gdb_error_hook (1 buffer in use) $ From those it's evident that you've successfully made it through kernel_init(), and have called machdep_init(POST_GDB) from here in main.c:main_loop()                 } else if (!(pc->flags & MINIMAL_MODE)) {                         read_in_kernel_config(IKCFG_INIT);                         kernel_init();       =====>            machdep_init(POST_GDB);                         vm_init();                         machdep_init(POST_VM);                         module_init();                         help_init();                         task_init();                         vfs_init();                         net_init();                         dev_init();                         machdep_init(POST_INIT);                 } which calls into arm.c:arm_init(POST_GDB).  That function has successfully made it past the STRUCT_SIZE_INIT(note_buf, "note_buf_t") call:               /*                 * We need to have information about note_buf_t which is used to                 * hold ELF note containing registers and status of the thread                 * that panic'd.                 */       =====>    STRUCT_SIZE_INIT(note_buf, "note_buf_t");                 STRUCT_SIZE_INIT(elf_prstatus, "elf_prstatus");                 MEMBER_OFFSET_INIT(elf_prstatus_pr_pid, "elf_prstatus",                                   "pr_pid");                 MEMBER_OFFSET_INIT(elf_prstatus_pr_reg, "elf_prstatus",                                   "pr_reg");                 break; But the next STRUCT_SIZE_INIT() for "elf_prstatus" apparently never got completed.  In any case, it ended up in open_tmpfile2():   $ tail teraterm.log   GETBUF(128 -> 0)   FREEBUF(0)   GETBUF(128 -> 0)   FREEBUF(0)   GETBUF(128 -> 0)   FREEBUF(0)     crash: cannot open secondary temporary file     1|shell@android:/system #   $ Although it's not clear how it's ending up in open_tmpfile2(), it's certainly of interest that the tmpfile() call is failing:     void   open_tmpfile2(void)   {           if (pc->tmpfile2)                   error(FATAL, "recursive secondary temporary file usage\n");             if ((pc->tmpfile2 = tmpfile()) == NULL)                   error(FATAL, "cannot open secondary temporary file\n");             rewind(pc->tmpfile2);   } The man page for tmpfile() shows these reasons:     RETURN VALUE         The tmpfile() function returns a stream descriptor, or NULL if a unique         filename cannot be generated or the unique file cannot  be  opened.  In         the latter case, errno is set to indicate the error.     ERRORS         EACCES Search permission denied for directory in file’s path prefix.           EEXIST Unable to generate a unique filename.           EINTR  The call was interrupted by a signal.           EMFILE Too many file descriptors in use by the process.           ENFILE Too many files open in the system.           ENOSPC There was no room in the directory to add the new filename.           EROFS  Read-only filesystem.   A couple things you might try:   (1) Put a perror() after the tmpfile() call to determine which errno       is being returned.   (2) Set "pc->flags |= DROP_CORE;" prior to the tmpfile() call. Like this:   void   open_tmpfile2(void)   {           if (pc->tmpfile2)                   error(FATAL, "recursive secondary temporary file usage\n"); +        pc->flags |= DROP_CORE; -        if ((pc->tmpfile2 = tmpfile()) == NULL) +        if ((pc->tmpfile2 = tmpfile()) == NULL) { +              perror("tmpfile");                 error(FATAL, "cannot open secondary temporary file\n"); +      }       pc->flags &= ~DROP_CORE;           rewind(pc->tmpfile2);   } Then get a backtrace by running gdb on the resultant core file, or just run the whole session from gdb. Dave