Segmentation fault in NGTQG example

[smanthe]

Hi,

thank you for this nice library. I want to test the ngtqg search from this example . Everything works so far until I try to run the search command. It crashes with a segmentation fault on my Ubuntu 20.04 system and also in a Docker container with Ubuntu 22.04. On my Ubuntu 20.04 system I printed the backtrace in GDB in oder to understand what I did wrong:

~/workspace/NGT/build/bin (master)$ gdb /usr/local/bin/ngtqg
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Reading symbols from /usr/local/bin/ngtqg...
(gdb) run search -n 20 -e 0.02 onng-40 query.tsv
Starting program: /usr/local/bin/ngtqg search -n 20 -e 0.02 onng-40 query.tsv
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
ngt::command=search
No quantized graph. Construct it temporarily.
indexType=t
size=20
edgeSize=-1
epsilon=0.02<->0.02,0.1

Program received signal SIGSEGV, Segmentation fault.
std::_Bit_reference::operator= (this=0x7fffffffcf80, __x=true) at /usr/include/c++/9/bits/stl_bvector.h:93
93              *_M_p |= _M_mask;
(gdb) bt
#0  std::_Bit_reference::operator= (this=0x7fffffffcf80, __x=true) at /usr/include/c++/9/bits/stl_bvector.h:93
#1  0x00007ffff7e6c407 in NGT::NeighborhoodGraph::setupSeeds (this=0x555555583008, sc=..., seeds=..., results=std::priority_queue wrapping: std::vector of length 10, capacity 16 = {...}, unchecked=std::priority_queue wrapping: std::vector of length 0, capacity 0, distanceChecked=...) at /home/smanthe/workspace/NGT/lib/NGT/Graph.cpp:488
#2  0x00007ffff7ee7f26 in NGTQG::Index::searchQuantizedGraph (this=0x7fffffffda00, graph=..., sc=..., seeds=...) at /home/smanthe/workspace/NGT/lib/NGT/NGTQ/QuantizedGraph.h:218
#3  0x00007ffff7ee8b0c in NGTQG::Index::search (this=0x7fffffffda00, index=..., sc=..., seeds=...) at /home/smanthe/workspace/NGT/lib/NGT/NGTQ/QuantizedGraph.h:358
#4  0x00007ffff7ee8d96 in NGTQG::Index::search (this=0x7fffffffda00, sq=...) at /home/smanthe/workspace/NGT/lib/NGT/NGTQ/QuantizedGraph.h:380
#5  0x00007ffff7f18d8e in search (index=..., searchParameters=..., stream=...) at /home/smanthe/workspace/NGT/lib/NGT/NGTQ/NGTQGCommand.cpp:173
#6  0x00007ffff7f19a2d in NGTQG::Command::search (this=0x7fffffffdb7c, args=...) at /home/smanthe/workspace/NGT/lib/NGT/NGTQ/NGTQGCommand.cpp:246
#7  0x0000555555564c2f in NGTQG::Command::execute (this=0x7fffffffdb7c, args=...) at /home/smanthe/workspace/NGT/lib/NGT/NGTQ/NGTQGCommand.h:116
#8  0x000055555556390e in main (argc=8, argv=0x7fffffffdd58) at /home/smanthe/workspace/NGT/bin/ngtqg/ngtqg.cpp:26

Nevertheless I have no clue what is wrong here. Does someone have any idea?

Thanks in advance.

Best regards, Stephan

[masajiro]

I have released v1.14.6 to fix this issue.

[smanthe]

Now it works. Thanks a lot for the fast help.