segfault and memory corruption in type instantiation, possibly because of integer overflow?

[nsajko]

NB: replacing typemax(Int) by typemax(Int) - 1 prevents the segfault

julia> versioninfo()
Julia Version 1.13.0-DEV.249
Commit bc98abcfbe3 (2025-03-18 05:23 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 8 × AMD Ryzen 3 5300U with Radeon Graphics
  WORD_SIZE: 64
  LLVM: libLLVM-19.1.7 (ORCJIT, znver2)
  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 8 virtual cores)
Environment:
  JULIA_NUM_PRECOMPILE_TASKS = 4
  JULIA_PKG_PRECOMPILE_AUTO = 0

julia> struct T{
           N,
           (Tuple{Vararg{T, N}} where {T}) <: Tup <: Tuple,
       }
       end

julia> T{typemax(Int)}

[3849] signal 11 (1): Segmentation fault
r:1expression starting at �8*r
ijl_svec_fill at /cache/build/builder-amdci5-6/julialang/julia-master/src/simplevector.c:91
jl_tupletype_fill at /cache/build/builder-amdci5-6/julialang/julia-master/src/jltypes.c:2081
inst_tuple_w_ at /cache/build/builder-amdci5-6/julialang/julia-master/src/jltypes.c:2557
inst_type_w_ at /cache/build/builder-amdci5-6/julialang/julia-master/src/jltypes.c:2725
inst_type_w_ at /cache/build/builder-amdci5-6/julialang/julia-master/src/jltypes.c:2644
inst_type_w_ at /cache/build/builder-amdci5-6/julialang/julia-master/src/jltypes.c:2622
ijl_instantiate_unionall at /cache/build/builder-amdci5-6/julialang/julia-master/src/jltypes.c:1535
ijl_apply_type at /cache/build/builder-amdci5-6/julialang/julia-master/src/jltypes.c:1469
_jl_invoke at /cache/build/builder-amdci5-6/julialang/julia-master/src/gf.c:3455 [inlined]
ijl_apply_generic at /cache/build/builder-amdci5-6/julialang/julia-master/src/gf.c:3655
jl_apply at /cache/build/builder-amdci5-6/julialang/julia-master/src/julia.h:2345 [inlined]
do_call at /cache/build/builder-amdci5-6/julialang/julia-master/src/interpreter.c:124
eval_value at /cache/build/builder-amdci5-6/julialang/julia-master/src/interpreter.c:242
eval_stmt_value at /cache/build/builder-amdci5-6/julialang/julia-master/src/interpreter.c:193 [inlined]
eval_body at /cache/build/builder-amdci5-6/julialang/julia-master/src/interpreter.c:692
jl_interpret_toplevel_thunk at /cache/build/builder-amdci5-6/julialang/julia-master/src/interpreter.c:897
jl_toplevel_eval_flex at /cache/build/builder-amdci5-6/julialang/julia-master/src/toplevel.c:1032
__repl_entry_eval_expanded_with_loc at /cache/build/builder-amdci5-6/julialang/julia-master/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:285
_jl_invoke at /cache/build/builder-amdci5-6/julialang/julia-master/src/gf.c:3455 [inlined]
ijl_apply_generic at /cache/build/builder-amdci5-6/julialang/julia-master/src/gf.c:3655
jl_apply at /cache/build/builder-amdci5-6/julialang/julia-master/src/julia.h:2345 [inlined]
jl_f_invokelatest at /cache/build/builder-amdci5-6/julialang/julia-master/src/builtins.c:853
toplevel_eval_with_hooks at /cache/build/builder-amdci5-6/julialang/julia-master/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:292
toplevel_eval_with_hooks at /cache/build/builder-amdci5-6/julialang/julia-master/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:296
toplevel_eval_with_hooks at /cache/build/builder-amdci5-6/julialang/julia-master/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:289 [inlined]
eval_user_input at /cache/build/builder-amdci5-6/julialang/julia-master/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:314
repl_backend_loop at /cache/build/builder-amdci5-6/julialang/julia-master/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:426
#start_repl_backend#41 at /cache/build/builder-amdci5-6/julialang/julia-master/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:411
start_repl_backend at /cache/build/builder-amdci5-6/julialang/julia-master/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:408 [inlined]
#run_repl#48 at /cache/build/builder-amdci5-6/julialang/julia-master/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:634
run_repl at /cache/build/builder-amdci5-6/julialang/julia-master/usr/share/julia/stdlib/v1.13/REPL/src/REPL.jl:620
jfptr_run_repl_21515.1 at /home/nsajko/tmp/jl/jl/nightly_assert/share/julia/compiled/v1.13/REPL/u0gqU_TD7ui.so (unknown line)
_jl_invoke at /cache/build/builder-amdci5-6/julialang/julia-master/src/gf.c:3455 [inlined]
ijl_apply_generic at /cache/build/builder-amdci5-6/julialang/julia-master/src/gf.c:3655
run_std_repl at ./client.jl:488
jfptr_run_std_repl_21032.1 at /home/nsajko/tmp/jl/jl/nightly_assert/lib/julia/sys.so (unknown line)
_jl_invoke at /cache/build/builder-amdci5-6/julialang/julia-master/src/gf.c:3455 [inlined]
ijl_apply_generic at /cache/build/builder-amdci5-6/julialang/julia-master/src/gf.c:3655
jl_apply at /cache/build/builder-amdci5-6/julialang/julia-master/src/julia.h:2345 [inlined]
jl_f_invokelatest at /cache/build/builder-amdci5-6/julialang/julia-master/src/builtins.c:853
run_main_repl at ./client.jl:509
repl_main at ./client.jl:596 [inlined]
_start at ./client.jl:571
jfptr__start_20245.1 at /home/nsajko/tmp/jl/jl/nightly_assert/lib/julia/sys.so (unknown line)
_jl_invoke at /cache/build/builder-amdci5-6/julialang/julia-master/src/gf.c:3455 [inlined]
ijl_apply_generic at /cache/build/builder-amdci5-6/julialang/julia-master/src/gf.c:3655
jl_apply at /cache/build/builder-amdci5-6/julialang/julia-master/src/julia.h:2345 [inlined]
true_main at /cache/build/builder-amdci5-6/julialang/julia-master/src/jlapi.c:951
jl_repl_entrypoint at /cache/build/builder-amdci5-6/julialang/julia-master/src/jlapi.c:1111
main at /cache/build/builder-amdci5-6/julialang/julia-master/cli/loader_exe.c:58
unknown function (ip: 0x720d7dfe6487) at /usr/lib/libc.so.6
__libc_start_main at /usr/lib/libc.so.6 (unknown line)
unknown function (ip: 0x4010b8) at /workspace/srcdir/glibc-2.17/csu/../sysdeps/x86_64/start.S
Allocations: 2312057 (Pool: 2311877; Big: 180); GC: 3
Segmentation fault (core dumped)