Stack trace upon assigning a long list of singleton lists to an R variable

[wouterbeek]

Reproducible case:

?- [library(real)].
?- findall([N], between(1, 10000, N), L), x <- L.
[Thread 1]: failed to recover from trail-overflow
C-stack trace labeled "out-of-stack":
  [0] save_backtrace() at /home/wbeek/Git/swipl-devel/src/os/pl-cstack.c:322 [0x7f45b9c82cfa]
  [1] outOfStack() at /home/wbeek/Git/swipl-devel/src/pl-alloc.c:240 [0x7f45b9bbfdde]
  [2] unify_ptrs() at /home/wbeek/Git/swipl-devel/src/pl-prims.c:434 (discriminator 12) [0x7f45b9c08b55]
  [3] PL_skip_list() at /home/wbeek/Git/swipl-devel/src/pl-fli.c:1939 [0x7f45b9bc3c5d]
  [4] list_length() at real.c:? [0x7f45afbc35db]
  [5] term_length() at real.c:? [0x7f45afbc404b]
  [6] matrix_sexp() at real.c:? [0x7f45afbc47b9]
  [7] pl_sexp() at real.c:? [0x7f45afbc4f53]
  [8] set_r_variable() at real.c:? [0x7f45afbc65ad]
  [9] PL_next_solution() at /home/wbeek/Git/swipl-devel/src/pl-vmi.c:3680 [0x7f45b9bd3175]
  [10] query_loop() at /home/wbeek/Git/swipl-devel/src/pl-pro.c:135 [0x7f45b9c0d6db]
  [11] prologToplevel() at /home/wbeek/Git/swipl-devel/src/pl-pro.c:445 [0x7f45b9c0defb]
  [12] PL_toplevel() at /home/wbeek/Git/swipl-devel/src/pl-fli.c:4244 [0x7f45b9bc7b6d]
  [13] swipl(main+0x15) [0x5560c79c0825]
  [14] __libc_start_main() at /build/glibc-cxyGtm/glibc-2.24/csu/../csu/libc-start.c:325 [0x7f45b95d23f1]
  [15] swipl(_start+0x2a) [0x5560c79c086a]
C-stack trace labeled "crash":
  [0] save_backtrace() at /home/wbeek/Git/swipl-devel/src/os/pl-cstack.c:322 [0x7f45b9c82cfa]
  [1] outOfStack() at /home/wbeek/Git/swipl-devel/src/pl-alloc.c:232 [0x7f45b9bbffca]
  [2] unify_ptrs() at /home/wbeek/Git/swipl-devel/src/pl-prims.c:434 (discriminator 12) [0x7f45b9c08b55]
  [3] PL_skip_list() at /home/wbeek/Git/swipl-devel/src/pl-fli.c:1939 [0x7f45b9bc3c5d]
  [4] list_length() at real.c:? [0x7f45afbc35db]
  [5] term_length() at real.c:? [0x7f45afbc404b]
  [6] matrix_sexp() at real.c:? [0x7f45afbc47b9]
  [7] pl_sexp() at real.c:? [0x7f45afbc4f53]
  [8] set_r_variable() at real.c:? [0x7f45afbc65ad]
  [9] PL_next_solution() at /home/wbeek/Git/swipl-devel/src/pl-vmi.c:3680 [0x7f45b9bd3175]
  [10] query_loop() at /home/wbeek/Git/swipl-devel/src/pl-pro.c:135 [0x7f45b9c0d6db]
  [11] prologToplevel() at /home/wbeek/Git/swipl-devel/src/pl-pro.c:445 [0x7f45b9c0defb]
  [12] PL_toplevel() at /home/wbeek/Git/swipl-devel/src/pl-fli.c:4244 [0x7f45b9bc7b6d]
  [13] swipl(main+0x15) [0x5560c79c0825]
  [14] __libc_start_main() at /build/glibc-cxyGtm/glibc-2.24/csu/../csu/libc-start.c:325 [0x7f45b95d23f1]
  [15] swipl(_start+0x2a) [0x5560c79c086a]
[FATAL ERROR: at Wed May  3 23:14:23 2017
	Sorry, cannot continue]

[nicos-angelopoulos]

Dear Wouter,

many thanks for reporting. Will have a look the next few days.

In the meantime you can use terms instead of singletons:

?- findall( row(N), between(1, 10000, N), L), x <- L.
L = [row(1), row(2), row(3), row(4), row(5), row(6), row(7), row(8), row(...)|...].

?- <- x.
[,1]
[1,] 1
[2,] 2
[3,] 3

.....