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Chapter 19. Analyzing a core dump

To identify the cause of the system crash, you can use the crash utility, which provides an interactive prompt similar to the GNU Debugger (GDB). By using crash, you can analyze a core dump created by kdump, netdump, diskdump, or xendump and a running Linux system. Alternatively, you can use the Kernel Oops Analyzer or the Kdump Helper tool.

19.1. Installing the crash utility
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With the provided information, understand the required packages and the procedure to install the crash utility. The crash utility might not be installed by default on your RHEL 9 systems. crash is a tool to interactively analyze a system’s state while it is running or after a kernel crash occurs and a core dump file is created. The core dump file is also known as the vmcore file.

Procedure

  1. Enable the relevant repositories: 

    # subscription-manager repos --enable baseos repository
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    # subscription-manager repos --enable appstream repository
    Copy to Clipboard Toggle word wrap 
    # subscription-manager repos --enable rhel-9-for-x86_64-baseos-debug-rpms
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  2. Install the crash package: 

    # dnf install crash
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  3. Install the kernel-debuginfo package: 

    # dnf install kernel-debuginfo
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    The package kernel-debuginfo will correspond to the running kernel and provides the data necessary for the dump analysis.

19.2. Running and exiting the crash utility
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The crash utility is a powerful tool for analyzing kdump. By running crash on a crash dump file, you can gain insights into the system’s state at the time of the crash, identify the root cause of the issue, and troubleshoot kernel-related problems.

Prerequisites

  • Identify the currently running kernel (for example 5.14.0-1.el9.x86_64).

Procedure

  1. To start the crash utility, two necessary parameters need to be passed to the command:

    • The debug-info (a decompressed vmlinuz image), for example /usr/lib/debug/lib/modules/5.14.0-1.el9.x86_64/vmlinux provided through a specific kernel-debuginfo package.

    • The actual vmcore file, for example /var/crash/127.0.0.1-2021-09-13-14:05:33/vmcore

      The resulting crash command then looks: 

      # crash /usr/lib/debug/lib/modules/5.14.0-1.el9.x86_64/vmlinux /var/crash/127.0.0.1-2021-09-13-14:05:33/vmcore
      Copy to Clipboard Toggle word wrap

      Use the same <kernel> version that was captured by kdump.

  2. Running the crash utility.

    The following example shows analyzing a core dump created on September 13 2021 at 14:05 PM, using the 5.14.0-1.el9.x86_64 kernel. 

    ...
WARNING: kernel relocated [202MB]: patching 90160 gdb minimal_symbol values

      KERNEL: /usr/lib/debug/lib/modules/5.14.0-1.el9.x86_64/vmlinux
    DUMPFILE: /var/crash/127.0.0.1-2021-09-13-14:05:33/vmcore  [PARTIAL DUMP]
        CPUS: 2
        DATE: Mon Sep 13 14:05:16 2021
      UPTIME: 01:03:57
LOAD AVERAGE: 0.00, 0.00, 0.00
       TASKS: 586
    NODENAME: localhost.localdomain
     RELEASE: 5.14.0-1.el9.x86_64
     VERSION: #1 SMP Wed Aug 29 11:51:55 UTC 2018
     MACHINE: x86_64  (2904 Mhz)
      MEMORY: 2.9 GB
       PANIC: "sysrq: SysRq : Trigger a crash"
         PID: 10635
     COMMAND: "bash"
        TASK: ffff8d6c84271800  [THREAD_INFO: ffff8d6c84271800]
         CPU: 1
       STATE: TASK_RUNNING (SYSRQ)

crash>
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  3. To exit the interactive prompt and stop crash, type exit or q. 

    crash> exit
~]#
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Note

The crash command is also utilized as a powerful tool for debugging a live system. However, you must use it with caution to avoid system-level issues.

19.3. Displaying various indicators in the crash utility
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Use the crash utility to display various indicators, such as a kernel message buffer, a backtrace, a process status, virtual memory information and open files.

Displaying the message buffer

  • To display the kernel message buffer, type the log command at the interactive prompt: 

    crash> log
... several lines omitted ...
EIP: 0060:[<c068124f>] EFLAGS: 00010096 CPU: 2
EIP is at sysrq_handle_crash+0xf/0x20
EAX: 00000063 EBX: 00000063 ECX: c09e1c8c EDX: 00000000
ESI: c0a09ca0 EDI: 00000286 EBP: 00000000 ESP: ef4dbf24
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process bash (pid: 5591, ti=ef4da000 task=f196d560 task.ti=ef4da000)
Stack:
 c068146b c0960891 c0968653 00000003 00000000 00000002 efade5c0 c06814d0
<0> fffffffb c068150f b7776000 f2600c40 c0569ec4 ef4dbf9c 00000002 b7776000
<0> efade5c0 00000002 b7776000 c0569e60 c051de50 ef4dbf9c f196d560 ef4dbfb4
Call Trace:
 [<c068146b>] ? __handle_sysrq+0xfb/0x160
 [<c06814d0>] ? write_sysrq_trigger+0x0/0x50
 [<c068150f>] ? write_sysrq_trigger+0x3f/0x50
 [<c0569ec4>] ? proc_reg_write+0x64/0xa0
 [<c0569e60>] ? proc_reg_write+0x0/0xa0
 [<c051de50>] ? vfs_write+0xa0/0x190
 [<c051e8d1>] ? sys_write+0x41/0x70
 [<c0409adc>] ? syscall_call+0x7/0xb
Code: a0 c0 01 0f b6 41 03 19 d2 f7 d2 83 e2 03 83 e0 cf c1 e2 04 09 d0 88 41 03 f3 c3 90 c7 05 c8 1b 9e c0 01 00 00 00 0f ae f8 89 f6 <c6> 05 00 00 00 00 01 c3 89 f6 8d bc 27 00 00 00 00 8d 50 d0 83
EIP: [<c068124f>] sysrq_handle_crash+0xf/0x20 SS:ESP 0068:ef4dbf24
CR2: 0000000000000000
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    Type help log for more information about the command usage.

    Note

    The kernel message buffer includes the most essential information about the system crash. It is always dumped first in to the vmcore-dmesg.txt file. If you fail to obtain the full vmcore file, for example, due to insufficient space on the target location, you can obtain the required information from the kernel message buffer. By default, vmcore-dmesg.txt is placed in the /var/crash/ directory.

Displaying a backtrace

  • To display the kernel stack trace, use the bt command. 

    crash> bt
PID: 5591   TASK: f196d560  CPU: 2   COMMAND: "bash"
 #0 [ef4dbdcc] crash_kexec at c0494922
 #1 [ef4dbe20] oops_end at c080e402
 #2 [ef4dbe34] no_context at c043089d
 #3 [ef4dbe58] bad_area at c0430b26
 #4 [ef4dbe6c] do_page_fault at c080fb9b
 #5 [ef4dbee4] error_code (via page_fault) at c080d809
    EAX: 00000063  EBX: 00000063  ECX: c09e1c8c  EDX: 00000000  EBP: 00000000
    DS:  007b      ESI: c0a09ca0  ES:  007b      EDI: 00000286  GS:  00e0
    CS:  0060      EIP: c068124f  ERR: ffffffff  EFLAGS: 00010096
 #6 [ef4dbf18] sysrq_handle_crash at c068124f
 #7 [ef4dbf24] __handle_sysrq at c0681469
 #8 [ef4dbf48] write_sysrq_trigger at c068150a
 #9 [ef4dbf54] proc_reg_write at c0569ec2
#10 [ef4dbf74] vfs_write at c051de4e
#11 [ef4dbf94] sys_write at c051e8cc
#12 [ef4dbfb0] system_call at c0409ad5
    EAX: ffffffda  EBX: 00000001  ECX: b7776000  EDX: 00000002
    DS:  007b      ESI: 00000002  ES:  007b      EDI: b7776000
    SS:  007b      ESP: bfcb2088  EBP: bfcb20b4  GS:  0033
    CS:  0073      EIP: 00edc416  ERR: 00000004  EFLAGS: 00000246
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    Type bt <pid> to display the backtrace of a specific process or type help bt for more information about bt usage.

Displaying a process status

  • To display the status of processes in the system, use the ps command. 

    crash> ps
   PID    PPID  CPU   TASK    ST  %MEM     VSZ    RSS  COMM
>     0      0   0  c09dc560  RU   0.0       0      0  [swapper]
>     0      0   1  f7072030  RU   0.0       0      0  [swapper]
      0      0   2  f70a3a90  RU   0.0       0      0  [swapper]
>     0      0   3  f70ac560  RU   0.0       0      0  [swapper]
      1      0   1  f705ba90  IN   0.0    2828   1424  init
... several lines omitted ...
   5566      1   1  f2592560  IN   0.0   12876    784  auditd
   5567      1   2  ef427560  IN   0.0   12876    784  auditd
   5587   5132   0  f196d030  IN   0.0   11064   3184  sshd
>  5591   5587   2  f196d560  RU   0.0    5084   1648  bash
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    Use ps <pid> to display the status of a single specific process. Use help ps for more information about ps usage.

Displaying virtual memory information

  • To display basic virtual memory information, type the vm command at the interactive prompt. 

    crash> vm
PID: 5591   TASK: f196d560  CPU: 2   COMMAND: "bash"
   MM       PGD      RSS    TOTAL_VM
f19b5900  ef9c6000  1648k    5084k
  VMA       START      END    FLAGS  FILE
f1bb0310    242000    260000 8000875  /lib/ld-2.12.so
f26af0b8    260000    261000 8100871  /lib/ld-2.12.so
efbc275c    261000    262000 8100873  /lib/ld-2.12.so
efbc2a18    268000    3ed000 8000075  /lib/libc-2.12.so
efbc23d8    3ed000    3ee000 8000070  /lib/libc-2.12.so
efbc2888    3ee000    3f0000 8100071  /lib/libc-2.12.so
efbc2cd4    3f0000    3f1000 8100073  /lib/libc-2.12.so
efbc243c    3f1000    3f4000 100073
efbc28ec    3f6000    3f9000 8000075  /lib/libdl-2.12.so
efbc2568    3f9000    3fa000 8100071  /lib/libdl-2.12.so
efbc2f2c    3fa000    3fb000 8100073  /lib/libdl-2.12.so
f26af888    7e6000    7fc000 8000075  /lib/libtinfo.so.5.7
f26aff2c    7fc000    7ff000 8100073  /lib/libtinfo.so.5.7
efbc211c    d83000    d8f000 8000075  /lib/libnss_files-2.12.so
efbc2504    d8f000    d90000 8100071  /lib/libnss_files-2.12.so
efbc2950    d90000    d91000 8100073  /lib/libnss_files-2.12.so
f26afe00    edc000    edd000 4040075
f1bb0a18   8047000   8118000 8001875  /bin/bash
f1bb01e4   8118000   811d000 8101873  /bin/bash
f1bb0c70   811d000   8122000 100073
f26afae0   9fd9000   9ffa000 100073
... several lines omitted ...
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    Use vm <pid> to display information about a single specific process, or use help vm for more information about vm usage.

Displaying open files

  • To display information about open files, use the files command. 

    crash> files
PID: 5591   TASK: f196d560  CPU: 2   COMMAND: "bash"
ROOT: /    CWD: /root
 FD    FILE     DENTRY    INODE    TYPE  PATH
  0  f734f640  eedc2c6c  eecd6048  CHR   /pts/0
  1  efade5c0  eee14090  f00431d4  REG   /proc/sysrq-trigger
  2  f734f640  eedc2c6c  eecd6048  CHR   /pts/0
 10  f734f640  eedc2c6c  eecd6048  CHR   /pts/0
255  f734f640  eedc2c6c  eecd6048  CHR   /pts/0
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    Use files <pid> to display files opened by only one selected process, or use help files for more information about files usage.

19.4. Using Kernel Oops Analyzer
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The Kernel Oops Analyzer tool analyzes the crash dump by comparing the oops messages with known issues in the knowledge base.

Prerequisites

  • An oops message is secured to feed the Kernel Oops Analyzer.

Procedure

  1. Access the Kernel Oops Analyzer tool.

  2. To diagnose a kernel crash issue, upload a kernel oops log generated in vmcore.

    • Alternatively, you can diagnose a kernel crash issue by providing a text message or a vmcore-dmesg.txt as an input.
  3. Click DETECT to compare the oops message based on information from the makedumpfile against known solutions.

19.5. The Kdump Helper tool
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The Kdump Helper tool helps to set up the kdump using the provided information. Kdump Helper generates a configuration script based on your preferences. Initiating and running the script on your server sets up the kdump service.

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