【Linux】6. crash toolでカーネルメモリを見る

$ sudo apt install ubuntu-dbgsym-keyring

  $ echo "deb http://ddebs.ubuntu.com $(lsb_release -cs) main restricted universe multiverse
  deb http://ddebs.ubuntu.com $(lsb_release -cs)-updates main restricted universe multiverse
  deb http://ddebs.ubuntu.com $(lsb_release -cs)-proposed main restricted universe multiverse" | \
  sudo tee -a /etc/apt/sources.list.d/ddebs.list

$ sudo apt update

$ sudo apt install linux-image-$(uname -r)-dbgsym

$ sudo apt install crash

$ sudo crash /usr/lib/debug/boot/vmlinux-5.15.0-1031-xilinx-zynqmp 


crash 8.0.0
Copyright (C) 2002-2021  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, 2020-2021  NEC Corporation
Copyright (C) 1999, 2002, 2007  Silicon Graphics, Inc.
Copyright (C) 1999, 2000, 2001, 2002  Mission Critical Linux, Inc.
Copyright (C) 2015, 2021  VMware, 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) 10.2
Copyright (C) 2021 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 "aarch64-unknown-linux-gnu".
Type "show configuration" for configuration details.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...

      KERNEL: /usr/lib/debug/boot/vmlinux-5.15.0-1031-xilinx-zynqmp  [TAINTED]　
    DUMPFILE: /proc/kcore
        CPUS: 4
        DATE: Wed Aug 28 02:51:17 JST 2024
      UPTIME: 01:59:53
LOAD AVERAGE: 1.06, 0.72, 0.79
       TASKS: 449
    NODENAME: kria
     RELEASE: 5.15.0-1031-xilinx-zynqmp
     VERSION: #35-Ubuntu SMP Fri Jun 14 02:59:36 UTC 2024
     MACHINE: aarch64  (unknown Mhz)
      MEMORY: 4 GB
         PID: 12520
     COMMAND: "crash"
        TASK: ffff000802d65140  [THREAD_INFO: ffff000802d65140]　
         CPU: 3
       STATE: TASK_RUNNING (ACTIVE)

crash> 

crash> log
[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]　
[    0.000000] Linux version 5.15.0-1031-xilinx-zynqmp (buildd@bos03-arm64-030) (gcc (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0, GNU ld (GNU Binutils for Ubuntu) 2.38) #35-Ubuntu SMP Fri Jun 14 02:59:36 UTC 2024 (Ubuntu 5.15.0-1031.35-xilinx-zynqmp 5.15.152)
[    0.000000] Machine model: ZynqMP KR260 revB
[    0.000000] efi: UEFI not found.
[    0.000000] earlycon: cdns0 at MMIO 0x00000000ff010000 (options '115200n8')
[    0.000000] printk: bootconsole [cdns0] enabled
[    0.000000] NUMA: No NUMA configuration found
[    0.000000] NUMA: Faking a node at [mem 0x0000000000000000-0x000000087fffffff]　
[    0.000000] NUMA: NODE_DATA [mem 0x87f7c5340-0x87f7c9fff]　
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000000000-0x00000000ffffffff]　
[    0.000000]   DMA32    empty
[    0.000000]   Normal   [mem 0x0000000100000000-0x000000087fffffff]　
[    0.000000]   Device   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x000000007fefffff]　
[    0.000000]   node   0: [mem 0x000000007ff00000-0x000000007fffffff]　
[    0.000000]   node   0: [mem 0x0000000800000000-0x000000087fffffff]　
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x000000087fffffff]　
(...)

crash> log |grep cma
[    0.000000] cma: Reserved 1000 MiB at 0x0000000037400000
[    0.000000] Kernel command line:  root=LABEL=writable rootwait earlycon console=ttyPS1,115200 console=tty1 clk_ignore_unused uio_pdrv_genirq.of_id=generic-uio xilinx_tsn_ep.st_pcp=4 cma=1000M 
[    0.000000] Memory: 2924836K/4194304K available (20992K kernel code, 3314K rwdata, 15584K rodata, 6848K init, 1340K bss, 245468K reserved, 1024000K cma-reserved)

crash> runq
CPU 0 RUNQUEUE: ffff00087f747440
  CURRENT: PID: 12520  TASK: ffff000802d65140  COMMAND: "crash"
  RT PRIO_ARRAY: ffff00087f747700
　[no tasks queued]　
  CFS RB_ROOT: ffff00087f747580
　[no tasks queued]　

CPU 1 RUNQUEUE: ffff00087f766440
  CURRENT: PID: 0      TASK: ffff00080027b0c0  COMMAND: "swapper/1"
  RT PRIO_ARRAY: ffff00087f766700
　[no tasks queued]　　
  CFS RB_ROOT: ffff00087f766580
     [120] PID: 27057  TASK: ffff000800382080  COMMAND: "kworker/u8:3"
     [120] PID: 2098   TASK: ffff000804d90000  COMMAND: "code-fee1edb8d6"

CPU 2 RUNQUEUE: ffff00087f785440
  CURRENT: PID: 0      TASK: ffff00080027c100  COMMAND: "swapper/2"
  RT PRIO_ARRAY: ffff00087f785700
  　[no tasks queued]　　
  CFS RB_ROOT: ffff00087f785580
　[no tasks queued]　　

CPU 3 RUNQUEUE: ffff00087f7a4440
  CURRENT: PID: 0      TASK: ffff000800278000  COMMAND: "swapper/3"
  RT PRIO_ARRAY: ffff00087f7a4700
　[no tasks queued]　　
  CFS RB_ROOT: ffff00087f7a4580
　[no tasks queued]　　

crash> p jiffies
jiffies = $2 = 4300814933

# HEX
crash> px jiffies
jiffies = $3 = 0x10084496e