Segmentation Fault in StringIndexFile::trySequenceAccess

[ting668]

• Problem Description
  During the execution of gquery with the query file poc_04.sql on the lubm7 database, the program crashes with a segmentation fault (SIGSEGV) in the string index retrieval phase. The crash occurs in a low-level memory copy operation (memmove) while attempting to perform sequence access on string data during the final result construction phase of query evaluation.

• Prerequisites
  bin/gbuild -db lubm7 -f ./data/lubm/lubm.nt
  Test case:

poc_04.sql

• Reproduction Steps && Error Log

ing668@nuc:~/gStore$ gdb ./bin/gquery
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Reading symbols from ./bin/gquery...
(gdb) run -db lubm7 -q ./poc/poc_04.sql
Starting program: /home/ting668/gStore/bin/gquery -db lubm7 -q ./poc/poc_04.sql
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff3bff640 (LWP 14641)]
[New Thread 0x7ffff33fe640 (LWP 14642)]
[New Thread 0x7ffff2bfd640 (LWP 14643)]
[New Thread 0x7ffff23fc640 (LWP 14644)]
[New Thread 0x7ffff1bfb640 (LWP 14645)]
[New Thread 0x7ffff13fa640 (LWP 14646)]
[New Thread 0x7ffff03ff640 (LWP 14647)]
[Thread 0x7ffff1bfb640 (LWP 14645) exited]
[New Thread 0x7fffee9ff640 (LWP 14648)]
[Thread 0x7ffff03ff640 (LWP 14647) exited]
[New Thread 0x7fffed3fe640 (LWP 14649)]
[New Thread 0x7fffec9fd640 (LWP 14650)]
[Thread 0x7ffff13fa640 (LWP 14646) exited]
[Thread 0x7fffed3fe640 (LWP 14649) exited]
[Thread 0x7fffee9ff640 (LWP 14648) exited]
[New Thread 0x7fffeb7ff640 (LWP 14651)]
[New Thread 0x7fffeaffe640 (LWP 14652)]
[New Thread 0x7fffea7fd640 (LWP 14653)]
[Thread 0x7fffec9fd640 (LWP 14650) exited]
[Thread 0x7fffeb7ff640 (LWP 14651) exited]
[Thread 0x7fffea7fd640 (LWP 14653) exited]
[==================================================] Set pre map, pre num = 5
[Thread 0x7fffeaffe640 (LWP 14652) exited]
[==================================================] Load cache done!
[New Thread 0x7fffeaffe640 (LWP 14654)]
[New Thread 0x7fffeb7ff640 (LWP 14655)]
[New Thread 0x7fffed3fe640 (LWP 14656)]
[New Thread 0x7ffff03ff640 (LWP 14657)]
[Thread 0x7fffed3fe640 (LWP 14656) exited]
[New Thread 0x7ffff1bfb640 (LWP 14658)]
[New Thread 0x7ffff13fa640 (LWP 14659)]
[Thread 0x7fffeaffe640 (LWP 14654) exited]
[Thread 0x7ffff1bfb640 (LWP 14658) exited]
[New Thread 0x7fffec9fd640 (LWP 14660)]
[Thread 0x7ffff03ff640 (LWP 14657) exited]
[New Thread 0x7fffea7fd640 (LWP 14661)]
[New Thread 0x7fffe99ff640 (LWP 14662)]
[Thread 0x7ffff13fa640 (LWP 14659) exited]
[Thread 0x7fffe99ff640 (LWP 14662) exited]
[==================================================] Set pre map, pre num = 17
[Thread 0x7fffeb7ff640 (LWP 14655) exited]
[Thread 0x7fffec9fd640 (LWP 14660) exited]
[Thread 0x7fffea7fd640 (LWP 14661) exited]
[==================================================] Load cache done!

Thread 1 "gquery" received signal SIGSEGV, Segmentation fault.
__memmove_avx512_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:513
513     ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: No such file or directory.
(gdb) bt
#0  __memmove_avx512_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:513
#1  0x0000555555b88e63 in StringIndexFile::trySequenceAccess (this=0x7ffff404fb30, request=std::vector of length 199100, capacity 199100 = {...},
    buffer=@0x7fffffffc120: 0x7fffe807f9c0 "/", buffer_size=@0x7fffffffba0c: 2097154, real=true)
    at /home/ting668/gStore/src/StringIndex/StringIndex.cpp:225
#2  0x0000555555b8bd80 in StringIndex::trySequenceAccess (this=<optimized out>, requestVectors=0x7fffffffbc20,
    buffer=@0x7fffffffc120: 0x7fffe807f9c0 "/", buffer_size=@0x7fffffffba0c: 2097154, real=true)
    at /home/ting668/gStore/src/StringIndex/StringIndex.cpp:443
#3  0x0000555555849014 in GeneralEvaluation::getFinalResult (this=0x7fffe807f9c0, ret_result=...)
    at /home/ting668/gStore/src/Query/GeneralEvaluation.cpp:3602
#4  0x0000555555744ec4 in Database::query (this=0x7fffffffd848, _query="select ?s ?p?o2 ?p2 ?o2 where \n{ \n\t?s ?p ?o . \n\t?o ?p2  ?o .\n}\n\n",
    _result_set=..., _fp=0x7ffff6e1b780 <_IO_2_1_stdout_>, update_flag=true, export_flag=false, txn=std::shared_ptr<Transaction> (empty) = {...})
    at /home/ting668/gStore/src/Database/Database.cpp:1978
#5  0x000055555572dabf in main (argc=<optimized out>, argv=<optimized out>) at /home/ting668/gStore/src/Main/gquery.cpp:140
(gdb)