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[Linux] [RHEL9] CPU busy in VDSO;debug方法

  • 2026-02-05 00:42:04
[Linux] [RHEL9] CPU busy in VDSO;debug方法
最近在升级RHEL9的时候,遇到一个CPU忙的问题,从perf的数据看是busy在vdso这个库里。但是这个库没有实体文件对应,从网上找了两个方法从内存里dump信息:
第一个:https://zhuanlan.zhihu.com/p/632111280
dd if=/proc/1/mem of=/tmp/linux-vdso.so skip=140721601826816 ibs=1 count=4096

实测,这个方法不行,最后出现objdump失败:

# objdump -T /tmp/linux-vdso.soobjdump: /tmp/linux-vdso.so: file format not recognized

第二个方法是:

https://github.com/vext01/dump_vdso/blob/master/dump_vdso.c

使用C程序实时dump,得出的数据是OK的。但是还是对应不上。根据perf的数据看busy的函数地址是0x589,但是这个dump出来的vdso里和0x589对应的函数是:.eh_frame_hdr,这里明显不是一个函数,而是一个frame header。这个方法不可信(这个验证不成功的原因是这个程序是64位的,而发现问题的是32位程序,请参见最后一个方法)

	.eh_frame_hdr	: { *(.eh_frame_hdr) }		:text:eh_frame

第三个方法是是使用gdb实时调试一个程序:

info proc mapping0xf7fc0000 0xf7fc4000 0x4000     0x0        r--p  [vvar]0xf7fc4000 0xf7fc6000 0x2000     0x0        r-xp  [vdso]0xf7fc6000 0xf7fc7000 0x1000     0x0        r--p  /usr/lib/ld-linux.so.20xf7fc7000 0xf7fec000 0x25000    0x1000     r-xp  /usr/lib/ld-linux.so.20xf7fec000 0xf7ffb000 0xf000     0x26000    r--p  /usr/lib/ld-linux.so.2

根据上面的地址,推算出来地址,得到一个函数是__kernel_vsyscall,也说明是在调用系统函数调用:

(gdb) disass 0xf7fc4589Dump of assembler code for function __kernel_vsyscall:   0xf7fc4580 <+0>:       push   %ecx   0xf7fc4581 <+1>:       push   %edx   0xf7fc4582 <+2>:       push   %ebp   0xf7fc4583 <+3>:       mov    %esp,%ebp   0xf7fc4585 <+5>:       sysenter   0xf7fc4587 <+7>:       int    $0x80   0xf7fc4589 <+9>:       pop    %ebp   0xf7fc458a <+10>:      pop    %edx   0xf7fc458b <+11>:      pop    %ecx   0xf7fc458c <+12>:      ret   0xf7fc458d <+13>:      int3

最后从strace看,是有很多的函数调用:

fcntl64(54356579, F_GETFD)              = -1 EBADF (Bad file descriptor)fcntl64(54356580, F_GETFD)              = -1 EBADF (Bad file descriptor)fcntl64(54356581, F_GETFD)              = -1 EBADF (Bad file descriptor)fcntl64(54356582, F_GETFD)              = -1 EBADF (Bad file descriptor)fcntl64(54356583, F_GETFD)              = -1 EBADF (Bad file descriptor)fcntl64(54356584, F_GETFD)              = -1 EBADF (Bad file descriptor)fcntl64(54356585, F_GETFD)              = -1 EBADF (Bad file descriptor)fcntl64(54356586, F_GETFD)              = -1 EBADF (Bad file descriptor)

看了程序,这里有一个循环设置flag的操作,是在fork的时候,为了安全将子进程的所有fd都重新设置一遍。因为rlim_max值太大,导致CPU太忙。

            if (getrlimit(RLIMIT_NOFILE, &rlp) != -1) {                for (fd = STDERR_FILENO + 1; fd < rlp.rlim_max; fd++) {                    if ((flags = fcntl(fd, F_GETFD)) != -1) {                        fcntl(fd, F_SETFD, flags | FD_CLOEXEC);                    }                }            }

然后看了一下这个rlp.rlim_max的值是:1073741816

# sysctl -a | grep fs.nr_open; uname -afs.nr_open = 1073741816Linux a 5.14.0-611.16.1.el9_7.x86_64 #1 SMP PREEMPT_DYNAMIC Sun Dec 7 05:52:24 EST 2025 x86_64 x86_64 x86_64 GNU/Linux

这个数值就非常的大,导致程序有点忙了。

然后有返回到RHEL8上,查了一下这个值,没有这么大:

# sysctl -a | grep fs.nr_open; uname -afs.nr_open = 1048576Linux -a 4.18.0-553.85.1.el8_10.x86_64 #1 SMP Thu Nov 13 12:55:12 EST 2025 x86_64 x86_64 x86_64 GNU/Linux

关于eh_frame-and-eh_frame_hdr的资料:

https://linuxvox.com/blog/what-do-the-eh-frame-and-eh-frame-hdr-sections-store-exactly

第二个方法失效的原因是,我的程序是32位,而那个开源软件是64位!32和62有差别。
所以,第四个方法:使用copilot重新修改了一下代码,放到了自己的branch下:https://github.com/mzhan017/dump-vdso/tree/master
./dump-vdso    #  default: save to file vdso.so./dump-vdso -s #  just print symbols and addresses

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  1. CONNECT:[ UseTime:0.000506s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000756s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000273s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000276s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000452s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000481s ]
  8. SELECT * FROM `article` WHERE `id` = 472097 LIMIT 1 [ RunTime:0.000399s ]
  9. UPDATE `article` SET `lasttime` = 1770442486 WHERE `id` = 472097 [ RunTime:0.013493s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.002744s ]
  11. SELECT * FROM `article` WHERE `id` < 472097 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003948s ]
  12. SELECT * FROM `article` WHERE `id` > 472097 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000474s ]
  13. SELECT * FROM `article` WHERE `id` < 472097 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003868s ]
  14. SELECT * FROM `article` WHERE `id` < 472097 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000717s ]
  15. SELECT * FROM `article` WHERE `id` < 472097 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000705s ]
0.097050s