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长稳环境中tune2fs发生segfault，且出现异常后返回0
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#I5RYHG
Bug
peulerosci
Opened this issue
2022-09-20 10:07
<p> 【测试步骤】</p><p></p><p>1.iscsi、nullblk、本地盘跑io作为背景压力</p><p></p><p>2.周期注入故障，故障恢复后umount然后执行tune2fs在mount</p><p></p><p>3.不断重复，有结果1</p><p></p><p></p><p> 【结果输出】</p><p></p><p>tune2fs发生segfault</p><p></p><p>Core was generated by `tune2fs -e remount-ro /dev/mapper/360014052d123e2681dd4617976cadece'.</p><p></p><p>Program terminated with signal SIGSEGV, Segmentation fault.</p><p></p><p>#0 0x00007fdadad69917 in ext2fs_mmp_stop at mmp.c:405</p><p></p><p> bt</p><p></p><p>#0 0x00007fdadad69917 in ext2fs_mmp_stop at mmp.c:405</p><p></p><p>#1 0x0000558fa5a9365a in main at tune2fs.c:3440</p><p></p><p> p fs</p><p></p><p>$1 = 0x0</p><p></p><p> quit</p><p></p><p></p><p>【定位分析】</p><p>ext2fs_run_ext3_journal中，若ext2fs_open失败返回，fs已被置null，此时tune2fs会继续goto closefs，使用fs指针导致segfault</p><p></p><p></p><p></p><p></p>
<p> 【测试步骤】</p><p></p><p>1.iscsi、nullblk、本地盘跑io作为背景压力</p><p></p><p>2.周期注入故障，故障恢复后umount然后执行tune2fs在mount</p><p></p><p>3.不断重复，有结果1</p><p></p><p></p><p> 【结果输出】</p><p></p><p>tune2fs发生segfault</p><p></p><p>Core was generated by `tune2fs -e remount-ro /dev/mapper/360014052d123e2681dd4617976cadece'.</p><p></p><p>Program terminated with signal SIGSEGV, Segmentation fault.</p><p></p><p>#0 0x00007fdadad69917 in ext2fs_mmp_stop at mmp.c:405</p><p></p><p> bt</p><p></p><p>#0 0x00007fdadad69917 in ext2fs_mmp_stop at mmp.c:405</p><p></p><p>#1 0x0000558fa5a9365a in main at tune2fs.c:3440</p><p></p><p> p fs</p><p></p><p>$1 = 0x0</p><p></p><p> quit</p><p></p><p></p><p>【定位分析】</p><p>ext2fs_run_ext3_journal中，若ext2fs_open失败返回，fs已被置null，此时tune2fs会继续goto closefs，使用fs指针导致segfault</p><p></p><p></p><p></p><p></p>
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