error saving large table with String column

[zgornel]

The following code segfaults. Details:

• tested on Julia v1.3.0 and 1.0.3
• the crash is related to the string column zz: no crash occurs in its absence
• saving works for small table sizes i.e. n=1_000

using JuliaDB
using Random
n = 1_000_000  # works for 1_000
tbl = table((x=rand(n), y=rand(n), z=collect(1:n), zz=[randstring(2) for _ in 1:n]), pkey=:z);
save(tbl, "__tmp.tbl")

Stacktrace:

signal (11): Segmentation fault
in expression starting at REPL[1]:5
__memmove_sse2_unaligned_erms at /usr/bin/../lib/libc.so.6 (unknown line)
jl_pchar_to_string at /usr/bin/../lib/libjulia.so.1 (unknown line)
unsafe_string at ./strings/string.jl:53
unknown function (ip: 0x7fb0e406a8b8)
mmread at /home/zgornel/.julia/packages/MemPool/tlPqB/src/io.jl:135
deserialize at /home/zgornel/.julia/packages/MemPool/tlPqB/src/io.jl:27
handle_deserialize at /build/julia/src/julia-1.3.0/usr/share/julia/stdlib/v1.3/Serialization/src/Serialization.jl:786
deserialize at /build/julia/src/julia-1.3.0/usr/share/julia/stdlib/v1.3/Serialization/src/Serialization.jl:722
#30 at ./none:0 [inlined]
iterate at ./generator.jl:47 [inlined]
collect_to! at ./array.jl:667
unknown function (ip: 0x7fb0e4068d65)
collect_to! at ./array.jl:675
collect_to_with_first! at ./array.jl:646
unknown function (ip: 0x7fb0e4067762)
collect at ./array.jl:627
mmread at /home/zgornel/.julia/packages/JuliaDB/7cG1k/src/serialize.jl:53
deserialize at /home/zgornel/.julia/packages/MemPool/tlPqB/src/io.jl:27
handle_deserialize at /build/julia/src/julia-1.3.0/usr/share/julia/stdlib/v1.3/Serialization/src/Serialization.jl:786
deserialize at /build/julia/src/julia-1.3.0/usr/share/julia/stdlib/v1.3/Serialization/src/Serialization.jl:722
mmread at /home/zgornel/.julia/packages/JuliaDB/7cG1k/src/serialize.jl:84
deserialize at /home/zgornel/.julia/packages/MemPool/tlPqB/src/io.jl:27
handle_deserialize at /build/julia/src/julia-1.3.0/usr/share/julia/stdlib/v1.3/Serialization/src/Serialization.jl:786
deserialize at /build/julia/src/julia-1.3.0/usr/share/julia/stdlib/v1.3/Serialization/src/Serialization.jl:722
handle_deserialize at /build/julia/src/julia-1.3.0/usr/share/julia/stdlib/v1.3/Serialization/src/Serialization.jl:825
deserialize at /build/julia/src/julia-1.3.0/usr/share/julia/stdlib/v1.3/Serialization/src/Serialization.jl:722
deserialize at /build/julia/src/julia-1.3.0/usr/share/julia/stdlib/v1.3/Serialization/src/Serialization.jl:709 [inlined]
#open#271 at ./io.jl:298
open at ./io.jl:296 [inlined]
#load#197 at /home/zgornel/.julia/packages/JuliaDB/7cG1k/src/io.jl:182
load at /home/zgornel/.julia/packages/JuliaDB/7cG1k/src/io.jl:174 [inlined]
save at /home/zgornel/.julia/packages/JuliaDB/7cG1k/src/io.jl:215
unknown function (ip: 0x7fb0ffb3db4d)
unknown function (ip: 0x7fb0ffb3d7fa)
unknown function (ip: 0x7fb0ffb3e534)
unknown function (ip: 0x7fb0ffb3ec59)
unknown function (ip: 0xfffffffffffffffe)
unknown function (ip: 0x7fb0ae48f40f)
unknown function (ip: 0xffffffffffffffff)
unknown function (ip: 0x7fb0ffb3f079)
unknown function (ip: 0x7fb0ffa0351d)
unknown function (ip: 0x7fb0ffa03ba8)
jl_toplevel_eval_in at /usr/bin/../lib/libjulia.so.1 (unknown line)
unknown function (ip: 0x7fb0f2eb8171)
unknown function (ip: 0x7fb0f308eba6)
unknown function (ip: 0x7fb0f308eea4)
unknown function (ip: 0x7fb0ff9e9c94)
unknown function (ip: 0xffffffffffffffff)
Allocations: 27191659 (Pool: 27187400; Big: 4259); GC: 28
zsh: segmentation fault (core dumped)  julia --banner=no