@youknowone Another way to reproduce this is to run the following code

x = 123456789012345678901234567890
for i in range(0, 30):
    format(x, ',')
    x = x // 10

This will result in a panic!

Stack trace

stack backtrace:
   0: rust_begin_unwind
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:575:5
   1: core::panicking::panic_fmt
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/panicking.rs:64:14
   2: alloc::raw_vec::capacity_overflow
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/raw_vec.rs:518:5
   3: alloc::raw_vec::RawVec<T,A>::allocate_in
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/raw_vec.rs:178:27
   4: alloc::raw_vec::RawVec<T,A>::with_capacity_in
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/raw_vec.rs:131:9
   5: alloc::vec::Vec<T,A>::with_capacity_in
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/vec/mod.rs:673:20
   6: alloc::vec::Vec<T>::with_capacity
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/vec/mod.rs:483:9
   7: alloc::slice::<impl [T]>::repeat
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/slice.rs:499:23
   8: alloc::str::<impl str>::repeat
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/str.rs:532:46
   9: rustpython_common::format::FormatSpec::separate_integer
             at ./common/src/format.rs:341:27
  10: rustpython_common::format::FormatSpec::add_magnitude_separators_for_char
             at ./common/src/format.rs:321:26
  11: rustpython_common::format::FormatSpec::add_magnitude_separators
             at ./common/src/format.rs:405:17
  12: rustpython_common::format::FormatSpec::format_int
             at ./common/src/format.rs:562:29
  13: rustpython_vm::builtins::int::PyInt::format::{{closure}}
             at ./vm/src/builtins/int.rs:572:37
  14: core::result::Result<T,E>::and_then
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/result.rs:1372:22
  15: rustpython_vm::builtins::int::PyInt::format
             at ./vm/src/builtins/int.rs:571:9
  16: core::ops::function::Fn::call
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/ops/function.rs:161:5
  17: rustpython_vm::function::builtin::<impl rustpython_vm::function::builtin::sealed::PyNativeFuncInternal<(rustpython_vm::function::builtin::RefParam<S>,rustpython_vm::function::builtin::OwnedParam<T1>),R,rustpython_vm::vm::VirtualMachine> for F>::call_
             at ./vm/src/function/builtin.rs:93:17
  18: <F as rustpython_vm::function::builtin::IntoPyNativeFunc<(T,R,VM)>>::call
             at ./vm/src/function/builtin.rs:47:9
  19: rustpython_vm::function::builtin::IntoPyNativeFunc::into_func::{{closure}}
             at ./vm/src/function/builtin.rs:35:51
  20: <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/boxed.rs:2032:9
  21: <rustpython_vm::builtins::builtinfunc::PyBuiltinMethod as rustpython_vm::types::slot::Callable>::call
             at ./vm/src/builtins/builtinfunc.rs:210:9
  22: rustpython_vm::types::slot::Callable::slot_call
             at ./vm/src/types/slot.rs:563:13
  23: rustpython_vm::vm::vm_object::<impl rustpython_vm::vm::VirtualMachine>::_invoke
             at ./vm/src/vm/vm_object.rs:176:30
  24: rustpython_vm::vm::vm_object::<impl rustpython_vm::vm::VirtualMachine>::invoke
             at ./vm/src/vm/vm_object.rs:189:9
  25: rustpython_vm::vm::method::PyMethod::invoke
             at ./vm/src/vm/method.rs:121:9
  26: rustpython_vm::vm::vm_object::<impl rustpython_vm::vm::VirtualMachine>::call_special_method
             at ./vm/src/vm/vm_object.rs:165:9
  27: rustpython_vm::format::call_object_format
             at ./vm/src/format.rs:177:18
  28: rustpython_vm::stdlib::builtins::builtins::format
             at ./vm/src/stdlib/builtins.rs:324:9
  29: core::ops::function::Fn::call
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/ops/function.rs:161:5
  30: rustpython_vm::function::builtin::<impl rustpython_vm::function::builtin::sealed::PyNativeFuncInternal<(rustpython_vm::function::builtin::OwnedParam<T1>,rustpython_vm::function::builtin::OwnedParam<T2>),R,rustpython_vm::vm::VirtualMachine> for F>::call_
             at ./vm/src/function/builtin.rs:79:17
  31: <F as rustpython_vm::function::builtin::IntoPyNativeFunc<(T,R,VM)>>::call
             at ./vm/src/function/builtin.rs:47:9
  32: rustpython_vm::function::builtin::IntoPyNativeFunc::into_func::{{closure}}
             at ./vm/src/function/builtin.rs:35:51
  33: <alloc::boxed::Box<F,A> as core::ops::function::Fn<Args>>::call
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/alloc/src/boxed.rs:2032:9
  34: <rustpython_vm::builtins::builtinfunc::PyBuiltinFunction as rustpython_vm::types::slot::Callable>::call
             at ./vm/src/builtins/builtinfunc.rs:113:9
  35: rustpython_vm::types::slot::Callable::slot_call
             at ./vm/src/types/slot.rs:563:13
  36: rustpython_vm::vm::vm_object::<impl rustpython_vm::vm::VirtualMachine>::_invoke
             at ./vm/src/vm/vm_object.rs:176:30
  37: rustpython_vm::vm::vm_object::<impl rustpython_vm::vm::VirtualMachine>::invoke
             at ./vm/src/vm/vm_object.rs:189:9
  38: rustpython_vm::frame::ExecutingFrame::execute_call
             at ./vm/src/frame.rs:1350:21
  39: rustpython_vm::frame::ExecutingFrame::execute_instruction
             at ./vm/src/frame.rs:973:17
  40: rustpython_vm::frame::ExecutingFrame::run
             at ./vm/src/frame.rs:359:26
  41: rustpython_vm::frame::<impl rustpython_vm::object::core::PyRef<rustpython_vm::frame::Frame>>::run::{{closure}}
             at ./vm/src/frame.rs:228:35
  42: rustpython_vm::frame::<impl rustpython_vm::object::core::PyRef<rustpython_vm::frame::Frame>>::with_exec
             at ./vm/src/frame.rs:185:9
  43: rustpython_vm::frame::<impl rustpython_vm::object::core::PyRef<rustpython_vm::frame::Frame>>::run
             at ./vm/src/frame.rs:228:9
  44: rustpython_vm::vm::VirtualMachine::run_frame::{{closure}}
             at ./vm/src/vm/mod.rs:370:42
  45: rustpython_vm::vm::VirtualMachine::with_frame::{{closure}}
             at ./vm/src/vm/mod.rs:398:26
  46: rustpython_vm::vm::VirtualMachine::with_recursion
             at ./vm/src/vm/mod.rs:386:22
  47: rustpython_vm::vm::VirtualMachine::with_frame
             at ./vm/src/vm/mod.rs:396:9
  48: rustpython_vm::vm::VirtualMachine::run_frame
             at ./vm/src/vm/mod.rs:370:15
  49: rustpython_vm::vm::VirtualMachine::run_code_obj
             at ./vm/src/vm/mod.rs:345:9
  50: rustpython::shell::shell_exec
             at ./src/shell.rs:29:23
  51: rustpython::shell::run_shell
             at ./src/shell.rs:130:23
  52: rustpython::run_rustpython
             at ./src/lib.rs:196:17
  53: rustpython::run::{{closure}}
             at ./src/lib.rs:92:41
  54: rustpython_vm::vm::interpreter::Interpreter::run::{{closure}}
             at ./vm/src/vm/interpreter.rs:67:23
  55: rustpython_vm::vm::interpreter::Interpreter::enter::{{closure}}
             at ./vm/src/vm/interpreter.rs:59:39
  56: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/panic/unwind_safe.rs:271:9
  57: std::panicking::try::do_call
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:483:40
  58: ___rust_try
  59: std::panicking::try
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panicking.rs:447:19
  60: std::panic::catch_unwind
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/panic.rs:137:14
  61: rustpython_vm::vm::thread::enter_vm::{{closure}}
             at ./vm/src/vm/thread.rs:27:19
  62: std::thread::local::LocalKey<T>::try_with
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/thread/local.rs:446:16
  63: std::thread::local::LocalKey<T>::with
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/std/src/thread/local.rs:422:9
  64: rustpython_vm::vm::thread::enter_vm
             at ./vm/src/vm/thread.rs:24:5
  65: rustpython_vm::vm::interpreter::Interpreter::enter
             at ./vm/src/vm/interpreter.rs:59:9
  66: rustpython_vm::vm::interpreter::Interpreter::run
             at ./vm/src/vm/interpreter.rs:66:9
  67: rustpython::run
             at ./src/lib.rs:92:20
  68: rustpython::main
             at ./src/main.rs:2:5
  69: core::ops::function::FnOnce::call_once
             at /rustc/d5a82bbd26e1ad8b7401f6a718a9c57c96905483/library/core/src/ops/function.rs:507:5

Format panic in test_int__format__locale #4588

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Format panic in test_intformatlocale #4588