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The cache policy name taken as LV segment property must be duped for report as the VG/LV/seg structure is destroyed after processing, reporting happens later: $ valgrind lvs -o+cache_policy ... ==16589== Invalid read of size 1 ==16589== at 0x54ABCC3: dm_report_compact_fields (libdm-report.c:1739) ==16589== by 0x153FC7: _report (reporter.c:619) ==16589== by 0x1540A6: lvs (reporter.c:641) ==16589== by 0x148021: lvm_run_command (lvmcmdline.c:1452) ==16589== by 0x1495CB: lvm2_main (lvmcmdline.c:1907) ==16589== by 0x164712: main (lvm.c:21) ==16589== Address 0x7d465f2 is 8,338 bytes inside a block of size 16,384 free'd ==16589== at 0x4C2ACE9: free (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==16589== by 0x54B8C85: _free_chunk (pool-fast.c:318) ==16589== by 0x54B84FB: dm_pool_destroy (pool-fast.c:78) ==16589== by 0x1E59C7: _free_vg (vg.c:78) ==16589== by 0x1E5A6D: release_vg (vg.c:95) ==16589== by 0x159B6E: _process_lv_vgnameid_list (toollib.c:1967) ==16589== by 0x159DD7: process_each_lv (toollib.c:2030) ==16589== by 0x153ED8: _report (reporter.c:598) ==16589== by 0x1540A6: lvs (reporter.c:641) ==16589== by 0x148021: lvm_run_command (lvmcmdline.c:1452) ==16589== by 0x1495CB: lvm2_main (lvmcmdline.c:1907) ==16589== by 0x164712: main (lvm.c:21)