I am seeing repeated (but not reliably repeatable) segmentation faults sorting datasets in the 100MB-100GB range on a 64-bit Debian system using GNU sort 8.12 (and also 8.9). Stack traces seem to indicate problems during the merge phase, usually when the temporary files are being combined.
This may or may not be related to the recent discussion about #9307, but I am definitely using 8.12, rebuilt with CFLAGS=-g since several indicative values were otherwise optimised out, configured with --disable-nls --disable-threads, and am running with a fixed buffer -S 100M and also --parallel=1 to try to isolate problems from possible threading issues. I was seeing these crashes with a vanilla build also. At least one crash occurred when comparing the very last entry in the memory buffer to a non-existent entry, when merging large files. There was also a crash with total_lines=851122 in mergelines_node, which leads to node->hi containing what appears to be garbage, with length=2882303761517117516. The repository changelog seems to indicate that the current development release of sort has not changed since 8.12. Will attempting to track the problem down with 8.12 be useful? If so I can post stack traces and values of relevant variables from the core dump, or post a new issue in the tracker, or reopen #9307. If not, please suggest some specific actions I should take to generate useful information. Thanks, -- Andras Salamon [email protected]
