dm-thin长稳压力测试时pvscan发生segfault

【OS版本】：被测的版本信息

5.10.0-60.18.0.50.h355.kasan.openEuler-22.03-LTS.x86_64

lvm2-2.03.14-4.h6.openEuler-22.03-LTS.x86_64

【测试类型】

长稳压力测试

【测试步骤】

1.ramdisk组thinpool后不断创建和删除卷，同时mkfs和tune2fs并发执行

2.周期注入故障然后恢复，再重建thinpool

3,长时间重复，有结果1

【结果输出】

出现pvscan的segfault

Reading symbols from /usr/sbin/pvscan...

Reading symbols from /usr/lib/debug//usr/sbin/lvm-2.03.14-4.h6.openEuler-22.03-LTS.x86_64.debug...

[New LWP 2682530]

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/usr/lib64/libthread_db.so.1".

Core was generated by `pvscan --cache'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0  0x000055dd6c035550 in _vg_read_raw_area (fid=fid@entry=0x55dd6df41450, vgname=0x55dd6c0f914e "", area=area@entry=0x55dd6df34cf0, vg_fmtdata=0x0, use_previous_vg=use_previous_vg@entry=0x0, precommitted=precommitted@entry=0,

primary_mda=1, cmd=&lt;optimized out&gt;) at format_text/format-text.c:431

431	format_text/format-text.c: No such file or directory.

Missing separate debuginfos, use: dnf debuginfo-install glibc-2.34-70.h12.openEuler-22.03-LTS.x86_64 libaio-0.3.112-2.h1.openEuler-22.03-LTS.x86_64 libblkid-2.37.2-5.h4.openEuler-22.03-LTS.x86_64 libcap-2.61-1.openEuler-22.03-LTS.x86_64 libgcrypt-1.9.4-1.h1.openEuler-22.03-LTS.x86_64 libgpg-error-1.43-1.openEuler-22.03-LTS.x86_64 libselinux-3.3-1.openEuler-22.03-LTS.x86_64 libsepol-3.3-2.h2.openEuler-22.03-LTS.x86_64 lz4-1.9.3-2.h1.openEuler-22.03-LTS.x86_64 ncurses-libs-6.3-2.h1.openEuler-22.03-LTS.x86_64 pcre2-10.39-1.openEuler-22.03-LTS.x86_64 readline-8.1-1.openEuler-22.03-LTS.x86_64 systemd-libs-249-16.h5.openEuler-22.03-LTS.x86_64

(gdb) bt

#0  0x000055dd6c035550 in _vg_read_raw_area (fid=fid@entry=0x55dd6df41450, vgname=0x55dd6c0f914e "", area=area@entry=0x55dd6df34cf0, vg_fmtdata=0x0, use_previous_vg=use_previous_vg@entry=0x0, precommitted=precommitted@entry=0,

primary_mda=1, cmd=&lt;optimized out&gt;) at format_text/format-text.c:431

#1  0x000055dd6c0356ac in _vg_read_raw (cmd=&lt;optimized out&gt;, fid=0x55dd6df41450, vgname=&lt;optimized out&gt;, mda=0x55dd6df32180, vg_fmtdata=&lt;optimized out&gt;, use_previous_vg=0x0) at format_text/format-text.c:466

#2  0x000055dd6bfda782 in _online_devs (cmd=cmd@entry=0x55dd6de309e0, do_all=do_all@entry=1, pvscan_devs=pvscan_devs@entry=0x7ffd05527a50, pv_count=pv_count@entry=0x7ffd05527a40,

complete_vgnames=complete_vgnames@entry=0x7ffd05527a30) at pvscan.c:1342

#3  0x000055dd6bfdc92a in _pvscan_cache_all (argc=0, argv=&lt;optimized out&gt;, complete_vgnames=0x7ffd05527a30, cmd=0x55dd6de309e0) at pvscan.c:1661

#4  pvscan_cache_cmd (cmd=0x55dd6de309e0, argc=&lt;optimized out&gt;, argv=&lt;optimized out&gt;) at pvscan.c:1939

#5  0x000055dd6bfc71cb in lvm_run_command (cmd=cmd@entry=0x55dd6de309e0, argc=&lt;optimized out&gt;, argc@entry=2, argv=&lt;optimized out&gt;, argv@entry=0x7ffd05527e98) at lvmcmdline.c:3278

#6  0x000055dd6bfc8f5e in lvm2_main (argc=2, argv=0x7ffd05527e98) at lvmcmdline.c:3811

#7  0x00007fead4dd5270 in ?? () from /usr/lib64/libc.so.6

#8  0x00007fead4dd531c in __libc_start_main () from /usr/lib64/libc.so.6

#9  0x000055dd6bfa20c5 in _start ()

【预期输出】

无异常

【测试代码&amp;初步定位结论】

待定位，core文件保留

【是否新引入rpm包，是否进行了安全编译选项扫描】

否

【定位分析】（有效问题请“先对原有功能进行描述，重点描述与当前故障现象相关的技术点、以及缺陷出现的触发条件、错误出现的函数等”；非问题“需要澄清技术细节，描述技术实现原理以及当前现象合理性的解释”；重复问题请“说明重复问题单号”）

问题栈#0  0x000055dd6c035550 in _vg_read_raw_area (fid=fid@entry=0x55dd6df41450, vgname=0x55dd6c0f914e "", area=area@entry=0x55dd6df34cf0, vg_fmtdata=0x0, use_previous_vg=use_previous_vg@entry=0x0, precommitted=precommitted@entry=0,     primary_mda=1, cmd=&lt;optimized out&gt;) at format_text/format-text.c:431431		if (!vg &amp;&amp; !*use_previous_vg) {  // 异常点， use_previous_vg = 0x00Missing separate debuginfos, use: dnf debuginfo-install glibc-2.34-70.h26.openEuler-22.03-LTS.x86_64 libaio-0.3.112-2.h1.openEuler-22.03-LTS.x86_64 libblkid-2.37.2-5.h7.openEuler-22.03-LTS.x86_64 libcap-2.61-1.h1.openEuler-22.03-LTS.x86_64 libgcrypt-1.9.4-1.h4.openEuler-22.03-LTS.x86_64 libgpg-error-1.43-1.openEuler-22.03-LTS.x86_64 libselinux-3.3-1.openEuler-22.03-LTS.x86_64 libsepol-3.3-2.h2.openEuler-22.03-LTS.x86_64 lz4-1.9.3-2.h1.openEuler-22.03-LTS.x86_64 ncurses-libs-6.3-2.h2.openEuler-22.03-LTS.x86_64 pcre2-10.39-1.h3.openEuler-22.03-LTS.x86_64 readline-8.1-1.openEuler-22.03-LTS.x86_64 systemd-libs-249-16.h31.openEuler-22.03-LTS.x86_64 xz-libs-5.2.5-2.h1.openEuler-22.03-LTS.x86_64(gdb) bt#0  0x000055dd6c035550 in _vg_read_raw_area (fid=fid@entry=0x55dd6df41450, vgname=0x55dd6c0f914e "", area=area@entry=0x55dd6df34cf0, vg_fmtdata=0x0, use_previous_vg=use_previous_vg@entry=0x0, precommitted=precommitted@entry=0,     primary_mda=1, cmd=&lt;optimized out&gt;) at format_text/format-text.c:431#1  0x000055dd6c0356ac in _vg_read_raw (cmd=&lt;optimized out&gt;, fid=0x55dd6df41450, vgname=&lt;optimized out&gt;, mda=0x55dd6df32180, vg_fmtdata=&lt;optimized out&gt;, use_previous_vg=0x0) at format_text/format-text.c:466
//传入的use_previous_vg = 0x00, 后续也没有赋值或者修改#2  0x000055dd6bfda782 in _online_devs (cmd=cmd@entry=0x55dd6de309e0, do_all=do_all@entry=1, pvscan_devs=pvscan_devs@entry=0x7ffd05527a50, pv_count=pv_count@entry=0x7ffd05527a40,     complete_vgnames=complete_vgnames@entry=0x7ffd05527a30) at pvscan.c:1342#3  0x000055dd6bfdc92a in _pvscan_cache_all (argc=0, argv=&lt;optimized out&gt;, complete_vgnames=0x7ffd05527a30, cmd=0x55dd6de309e0) at pvscan.c:1661#4  pvscan_cache_cmd (cmd=0x55dd6de309e0, argc=&lt;optimized out&gt;, argv=&lt;optimized out&gt;) at pvscan.c:1939#5  0x000055dd6bfc71cb in lvm_run_command (cmd=cmd@entry=0x55dd6de309e0, argc=&lt;optimized out&gt;, argc@entry=2, argv=&lt;optimized out&gt;, argv@entry=0x7ffd05527e98) at lvmcmdline.c:3278#6  0x000055dd6bfc8f5e in lvm2_main (argc=2, argv=0x7ffd05527e98) at lvmcmdline.c:3811#7  0x00007fead4dd5270 in ?? () from /usr/lib64/libc.so.6#8  0x00007fead4dd531c in __libc_start_main () from /usr/lib64/libc.so.6#9  0x000055dd6bfa20c5 in _start ()(gdb) p vg$1 = (struct volume_group *) 0x0(gdb) p use_previous_vg$2 = (unsigned int *) 0x0(gdb)

出现问题的代码	vg = text_read_metadata(fid, NULL, vg_fmtdata, use_previous_vg, area-&gt;dev, primary_mda,				(off_t) (area-&gt;start + rlocn-&gt;offset),				(uint32_t) (rlocn-&gt;size - wrap),				(off_t) (area-&gt;start + MDA_HEADER_SIZE),				wrap,				calc_crc,				rlocn-&gt;checksum,				&amp;when, &amp;desc);
    //测试时，内核注入故障，导致读取元数据失败，vg 返回为NULL，所以触发了后续空指针操作	if (!vg &amp;&amp; !*use_previous_vg) {  // use_previous_vg = 0x00, 操作空指针		log_warn("WARNING: Failed to read metadata text at %llu off %llu size %llu VG %s on %s",			 (unsigned long long)(area-&gt;start + rlocn-&gt;offset),			 (unsigned long long)rlocn-&gt;offset,			 (unsigned long long)rlocn-&gt;size,			 vgname,			 dev_name(area-&gt;dev));
		return NULL;	}

【对外部(配置、头文件、外部函数)是否有影响】

否

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