Infinite/long backtrace on i686 under Wine

[purplesyringa]

I'm not sure where to file this bug, but it affects Rust more than other languages for reasons explained below, so let's at least make this visible here.

I tried running this code:

fn main() {
    panic!("Hello, world!");
}

with RUST_BACKTRACE=full under Wine.

I expected to see this happen: a short backtrace.

Instead, this happened: an infinite backtrace on i686-pc-windows-msvc and a finite, but longer than necessary, repetitive, and clearly wrong backtrace on i686-pc-windows-gnu.

This might not seem like much (does anyone use RUST_BACKTRACE=full in production?), but Rust forces a full backtrace on double panic, so panics in destructors effectively hang the process instead of aborting it. Beautiful.

I think it's fair to say that this is likely a Wine bug, however, I think it's also possible that LLVM generates wrong SEH frames, which Windows handles correctly only by chance. As a workaround, we might want to somewhat limit the backtrace length even on double panic?

Meta

rustc --version --verbose:

rustc 1.86.0-nightly (419b3e2d3 2025-01-15)
binary: rustc
commit-hash: 419b3e2d3e350822550eee0e82eeded4d324d584
commit-date: 2025-01-15
host: x86_64-unknown-linux-gnu
release: 1.86.0-nightly
LLVM version: 19.1.6

wine --version: wine-9.22 (Staging)

I'm cross-compiling for Windows with cargo-xwin for MSVC ABI and cross for GNU ABI:

• XWIN_ARCH=x86 RUST_BACKTRACE=full cargo xwin run --target i686-pc-windows-msvc
• RUST_BACKTRACE=full cross run --target i686-pc-windows-gnu

...but I have checked that the problem can be reproduced with executables built natively on Windows.

RUST_BACKTRACE=full backtrace on MSVC

thread 'main' panicked at src/main.rs:10:5:
Hello, world!
stack backtrace:
0024:fixme:dbghelp:i386_stack_walk new PC=833875c0 different from Eip=40b4ab
   0:   0x40b4ab - fmt
   1:   0x40b4ab - core::fmt::write
[the above lines repeated endlessly, with nothing but the frame depth changing]

RUST_BACKTRACE=full backtrace on GNU

thread 'main' panicked at src/main.rs:10:5:
Hello, world!
stack backtrace:
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp:elf_search_auxv can't find symbol in module
015c:fixme:dbghelp_dwarf:dwarf2_parse_udt_type Unhandled Tag type 0x33 at debug_info(abbrev:014D0610,symt:011EE5A0) in ctx(011E05E0,L"cringe")
015c:fixme:dbghelp_dwarf:dwarf2_parse_udt_type Unhandled Tag type 0x33 at debug_info(abbrev:014D0610,symt:011EE620) in ctx(011E05E0,L"cringe")
015c:fixme:dbghelp_dwarf:dwarf2_parse_udt_type Unhandled Tag type 0x33 at debug_info(abbrev:014D0610,symt:011EE720) in ctx(011E05E0,L"cringe")
015c:fixme:dbghelp_dwarf:dwarf2_parse_udt_type Unhandled Tag type 0x33 at debug_info(abbrev:014D0610,symt:025000B8) in ctx(011E05E0,L"cringe")
015c:fixme:dbghelp_dwarf:dwarf2_parse_udt_type Unhandled Tag type 0x33 at debug_info(abbrev:014D0610,symt:02500138) in ctx(011E05E0,L"cringe")
015c:fixme:dbghelp_dwarf:dwarf2_parse_udt_type Unhandled Tag type 0x33 at debug_info(abbrev:014D0610,symt:02500238) in ctx(011E05E0,L"cringe")
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
   0:   0x48406b - core::fmt::rt::Argument::fmt::h8360d965bd1e2b6e
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\fmt/rt.rs:177:76
   1:   0x48406b - core::fmt::write::hd923a73d9d161bb0
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\fmt/mod.rs:1440:21
   2:   0x48406b - core::fmt::rt::Argument::fmt::h8360d965bd1e2b6e
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\fmt/rt.rs:177:76
   3:   0x48406b - core::fmt::write::hd923a73d9d161bb0
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\fmt/mod.rs:1440:21
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
   4:   0x434015 - std::io::Write::write_fmt::had1d59cd6160ac1d
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src\io/mod.rs:1887:15
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
   5:   0x43dd85 - std::sys::backtrace::BacktraceLock::print::hd49d4d80db29b827
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src\sys/backtrace.rs:42:9
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
   6:   0x440387 - std::panicking::default_hook::{{closure}}::hd20fad6770713ea0
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:298:22
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
   7:   0x4401d0 - std::panicking::default_hook::h1a8c8518394b8a18
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:325:9
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
   8:   0x440df5 - std::panicking::rust_panic_with_hook::h9da62b45b00ce8e2
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:831:13
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
   9:   0x440b84 - std::panicking::begin_panic_handler::{{closure}}::h2f73c259c0a62ae3
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:697:13
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
  10:   0x43e8ab - std::sys::backtrace::__rust_end_short_backtrace::h8d127ac41d00cbaf
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src\sys/backtrace.rs:168:18
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
  11:   0x4408ae - rust_begin_unwind
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:695:5
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
  12:   0x4806f1 - core::panicking::panic_fmt::hffd0c350f3e911e2
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src/panicking.rs:75:14
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
  13:   0x40166f - cringe::main::he8e076d3e00c6e43
                       at /home/purplesyringa/cringe/src/main.rs:10:5
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
  14:   0x401809 - core::ops::function::FnOnce::call_once::hab1ff5b455ae04c6
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584\library\core\src\ops\function.rs:250:5
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
  15:   0x401791 - std::sys::backtrace::__rust_begin_short_backtrace::hf837e3a1102d85cf
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584\library\std\src\sys\backtrace.rs:152:18
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
  16:   0x401773 - std::rt::lang_start::{{closure}}::h0ed424ef8b484891
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584\library\std\src\rt.rs:194:18
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
  17:   0x426745 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h8eb84feb54c9cb1d
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\ops/function.rs:284:13
  18:   0x426745 - std::panicking::try::do_call::hfdc2187cea17d7ae
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  19:   0x426745 - std::panicking::try::h906cdc33b1ce235a
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  20:   0x426745 - std::panic::catch_unwind::he80bb62fbfbcf0ee
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  21:   0x426745 - std::rt::lang_start_internal::{{closure}}::h66a7d6bdfa5b0443
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:163:24
  22:   0x426745 - std::panicking::try::do_call::hbe592467235de060
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  23:   0x426745 - std::panicking::try::h887ebabf70af544c
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  24:   0x426745 - std::panic::catch_unwind::he0bcf444777fac47
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  25:   0x426745 - std::rt::lang_start_internal::hf4c77c5234ec0509
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:159:5
  26:   0x426745 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h8eb84feb54c9cb1d
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\ops/function.rs:284:13
  27:   0x426745 - std::panicking::try::do_call::hfdc2187cea17d7ae
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  28:   0x426745 - std::panicking::try::h906cdc33b1ce235a
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  29:   0x426745 - std::panic::catch_unwind::he80bb62fbfbcf0ee
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  30:   0x426745 - std::rt::lang_start_internal::{{closure}}::h66a7d6bdfa5b0443
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:163:24
  31:   0x426745 - std::panicking::try::do_call::hbe592467235de060
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  32:   0x426745 - std::panicking::try::h887ebabf70af544c
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  33:   0x426745 - std::panic::catch_unwind::he0bcf444777fac47
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  34:   0x426745 - std::rt::lang_start_internal::hf4c77c5234ec0509
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:159:5
  35:   0x426745 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h8eb84feb54c9cb1d
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\ops/function.rs:284:13
  36:   0x426745 - std::panicking::try::do_call::hfdc2187cea17d7ae
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  37:   0x426745 - std::panicking::try::h906cdc33b1ce235a
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  38:   0x426745 - std::panic::catch_unwind::he80bb62fbfbcf0ee
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  39:   0x426745 - std::rt::lang_start_internal::{{closure}}::h66a7d6bdfa5b0443
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:163:24
  40:   0x426745 - std::panicking::try::do_call::hbe592467235de060
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  41:   0x426745 - std::panicking::try::h887ebabf70af544c
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  42:   0x426745 - std::panic::catch_unwind::he0bcf444777fac47
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  43:   0x426745 - std::rt::lang_start_internal::hf4c77c5234ec0509
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:159:5
  44:   0x426745 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h8eb84feb54c9cb1d
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\ops/function.rs:284:13
  45:   0x426745 - std::panicking::try::do_call::hfdc2187cea17d7ae
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  46:   0x426745 - std::panicking::try::h906cdc33b1ce235a
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  47:   0x426745 - std::panic::catch_unwind::he80bb62fbfbcf0ee
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  48:   0x426745 - std::rt::lang_start_internal::{{closure}}::h66a7d6bdfa5b0443
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:163:24
  49:   0x426745 - std::panicking::try::do_call::hbe592467235de060
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  50:   0x426745 - std::panicking::try::h887ebabf70af544c
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  51:   0x426745 - std::panic::catch_unwind::he0bcf444777fac47
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  52:   0x426745 - std::rt::lang_start_internal::hf4c77c5234ec0509
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:159:5
  53:   0x426745 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h8eb84feb54c9cb1d
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\ops/function.rs:284:13
  54:   0x426745 - std::panicking::try::do_call::hfdc2187cea17d7ae
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  55:   0x426745 - std::panicking::try::h906cdc33b1ce235a
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  56:   0x426745 - std::panic::catch_unwind::he80bb62fbfbcf0ee
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  57:   0x426745 - std::rt::lang_start_internal::{{closure}}::h66a7d6bdfa5b0443
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:163:24
  58:   0x426745 - std::panicking::try::do_call::hbe592467235de060
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  59:   0x426745 - std::panicking::try::h887ebabf70af544c
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  60:   0x426745 - std::panic::catch_unwind::he0bcf444777fac47
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  61:   0x426745 - std::rt::lang_start_internal::hf4c77c5234ec0509
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:159:5
  62:   0x426745 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h8eb84feb54c9cb1d
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\ops/function.rs:284:13
  63:   0x426745 - std::panicking::try::do_call::hfdc2187cea17d7ae
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  64:   0x426745 - std::panicking::try::h906cdc33b1ce235a
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  65:   0x426745 - std::panic::catch_unwind::he80bb62fbfbcf0ee
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  66:   0x426745 - std::rt::lang_start_internal::{{closure}}::h66a7d6bdfa5b0443
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:163:24
  67:   0x426745 - std::panicking::try::do_call::hbe592467235de060
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  68:   0x426745 - std::panicking::try::h887ebabf70af544c
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  69:   0x426745 - std::panic::catch_unwind::he0bcf444777fac47
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  70:   0x426745 - std::rt::lang_start_internal::hf4c77c5234ec0509
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:159:5
  71:   0x426745 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h8eb84feb54c9cb1d
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\ops/function.rs:284:13
  72:   0x426745 - std::panicking::try::do_call::hfdc2187cea17d7ae
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  73:   0x426745 - std::panicking::try::h906cdc33b1ce235a
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  74:   0x426745 - std::panic::catch_unwind::he80bb62fbfbcf0ee
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  75:   0x426745 - std::rt::lang_start_internal::{{closure}}::h66a7d6bdfa5b0443
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:163:24
  76:   0x426745 - std::panicking::try::do_call::hbe592467235de060
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  77:   0x426745 - std::panicking::try::h887ebabf70af544c
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  78:   0x426745 - std::panic::catch_unwind::he0bcf444777fac47
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  79:   0x426745 - std::rt::lang_start_internal::hf4c77c5234ec0509
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:159:5
  80:   0x426745 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h8eb84feb54c9cb1d
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\ops/function.rs:284:13
  81:   0x426745 - std::panicking::try::do_call::hfdc2187cea17d7ae
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  82:   0x426745 - std::panicking::try::h906cdc33b1ce235a
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  83:   0x426745 - std::panic::catch_unwind::he80bb62fbfbcf0ee
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  84:   0x426745 - std::rt::lang_start_internal::{{closure}}::h66a7d6bdfa5b0443
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:163:24
  85:   0x426745 - std::panicking::try::do_call::hbe592467235de060
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  86:   0x426745 - std::panicking::try::h887ebabf70af544c
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  87:   0x426745 - std::panic::catch_unwind::he0bcf444777fac47
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  88:   0x426745 - std::rt::lang_start_internal::hf4c77c5234ec0509
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:159:5
  89:   0x426745 - core::ops::function::impls::<impl core::ops::function::FnOnce<A> for &F>::call_once::h8eb84feb54c9cb1d
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\core\src\ops/function.rs:284:13
  90:   0x426745 - std::panicking::try::do_call::hfdc2187cea17d7ae
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  91:   0x426745 - std::panicking::try::h906cdc33b1ce235a
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  92:   0x426745 - std::panic::catch_unwind::he80bb62fbfbcf0ee
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  93:   0x426745 - std::rt::lang_start_internal::{{closure}}::h66a7d6bdfa5b0443
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:163:24
  94:   0x426745 - std::panicking::try::do_call::hbe592467235de060
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:587:40
  95:   0x426745 - std::panicking::try::h887ebabf70af544c
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panicking.rs:550:19
  96:   0x426745 - std::panic::catch_unwind::he0bcf444777fac47
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/panic.rs:358:14
  97:   0x426745 - std::rt::lang_start_internal::hf4c77c5234ec0509
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584/library\std\src/rt.rs:159:5
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
  98:   0x40174b - std::rt::lang_start::h59c4269b4dacd45e
                       at /rustc/419b3e2d3e350822550eee0e82eeded4d324d584\library\std\src\rt.rs:193:5
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
  99:   0x4016ae - _main
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
 100:   0x401386 - __tmainCRTStartup
                       at ./build/i686-w64-mingw32-i686-w64-mingw32-crt/./mingw-w64-crt/crt/crtexe.c:339:15
015c:fixme:dbghelp_dwarf:parse_cie_details unknown CIE version 20 at 019E5928
 101: 0x785194c0 - @BaseThreadInitThunk@12
 102: 0x786c9aa3 - _call_thread_func_wrapper
 103: 0x786caef2 - call_thread_func
                       at /usr/src/packages/BUILD/dlls/ntdll/signal_i386.c:603:9

@rustbot label +A-backtrace +A-debuginfo +A-panic +A-runtime +E-needs-investigation +O-windows +O-x86_32 +T-compiler

[purplesyringa]

@rustbot label -needs-triage

[jyn514]

the default panic hook will give up after 100 frames for short backtraces (RUST_BACKTRACE=1), but it has no such limit for full backtraces. it seems reasonable to me to add a higher limit for that case - maybe 1000 frames? that should be enough for any reasonable program, more than that and you’re likely to exhaust the stack anyway.

[jyn514]

oh, we could also check for cyclic frames, if we end up back at the same instruction address we know dynamically that we’ll never finish printing.