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On i686 release builds, Valgrind reports depending on uninitialized values #63023

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tspiteri opened this issue Jul 26, 2019 · 4 comments
Closed

On i686 release builds, Valgrind reports depending on uninitialized values #63023

tspiteri opened this issue Jul 26, 2019 · 4 comments
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O-x86_32 Target: x86 processors, 32 bit (like i686-*)

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@tspiteri
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For the following main.rs

fn main() {
    let x = &[0i32];
    let _ = (x.iter().map(|_| 1i32))
        .chain(x.iter().map(|_| 1i32))
        .chain(x.iter().map(|_| 1i32))
        .chain(x.iter().map(|_| 1i32))
        .chain(x.iter().map(|_| 1i32))
        .collect::<Vec<i32>>();
}

On i686 GNU/Linux, for a release build, Valgrind reports “Conditional jump or move depends on uninitialised value(s)”.

I couldn’t reproduce the issue on debug builds or on x86_64.

$ uname -a
Linux Fedora-i686 4.17.3-200.fc28.i686 #1 SMP Tue Jun 26 14:19:07 UTC 2018 i686 i686 i386 GNU/Linux

$ rustc -V --verbose
rustc 1.36.0 (a53f9df32 2019-07-03)
binary: rustc
commit-hash: a53f9df32fbb0b5f4382caaad8f1a46f36ea887c
commit-date: 2019-07-03
host: i686-unknown-linux-gnu
release: 1.36.0
LLVM version: 8.0

$ cargo clean

$ cargo run --release
   Compiling try v0.1.0 (/home/user/try)
    Finished release [optimized] target(s) in 0.67s
     Running `target/release/try`

$ valgrind target/release/try
==20136== Memcheck, a memory error detector
==20136== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==20136== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
==20136== Command: target/release/try
==20136== 
==20136== Conditional jump or move depends on uninitialised value(s)
==20136==    at 0x10A608: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (in /home/user/try/target/release/try)
==20136==    by 0x109FF0: try::main (in /home/user/try/target/release/try)
==20136==    by 0x10A075: std::rt::lang_start::{{closure}} (in /home/user/try/target/release/try)
==20136==    by 0x110515: {{closure}} (rt.rs:49)
==20136==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==20136==    by 0x11243E: {{closure}} (rt.rs:49)
==20136==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==20136==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==20136==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==20136==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==20136==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==20136==    by 0x10A050: main (in /home/user/try/target/release/try)
==20136== 
==20136== Conditional jump or move depends on uninitialised value(s)
==20136==    at 0x10AD03: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (in /home/user/try/target/release/try)
==20136==    by 0x109FF0: try::main (in /home/user/try/target/release/try)
==20136==    by 0x10A075: std::rt::lang_start::{{closure}} (in /home/user/try/target/release/try)
==20136==    by 0x110515: {{closure}} (rt.rs:49)
==20136==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==20136==    by 0x11243E: {{closure}} (rt.rs:49)
==20136==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==20136==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==20136==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==20136==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==20136==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==20136==    by 0x10A050: main (in /home/user/try/target/release/try)
==20136== 
==20136== Conditional jump or move depends on uninitialised value(s)
==20136==    at 0x10AD22: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (in /home/user/try/target/release/try)
==20136==    by 0x109FF0: try::main (in /home/user/try/target/release/try)
==20136==    by 0x10A075: std::rt::lang_start::{{closure}} (in /home/user/try/target/release/try)
==20136==    by 0x110515: {{closure}} (rt.rs:49)
==20136==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==20136==    by 0x11243E: {{closure}} (rt.rs:49)
==20136==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==20136==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==20136==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==20136==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==20136==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==20136==    by 0x10A050: main (in /home/user/try/target/release/try)
==20136== 
==20136== Conditional jump or move depends on uninitialised value(s)
==20136==    at 0x10AD2C: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (in /home/user/try/target/release/try)
==20136==    by 0x109FF0: try::main (in /home/user/try/target/release/try)
==20136==    by 0x10A075: std::rt::lang_start::{{closure}} (in /home/user/try/target/release/try)
==20136==    by 0x110515: {{closure}} (rt.rs:49)
==20136==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==20136==    by 0x11243E: {{closure}} (rt.rs:49)
==20136==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==20136==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==20136==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==20136==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==20136==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==20136==    by 0x10A050: main (in /home/user/try/target/release/try)
==20136== 
==20136== Conditional jump or move depends on uninitialised value(s)
==20136==    at 0x111D1F: alloc (alloc.rs:9)
==20136==    by 0x111D1F: __rdl_alloc (alloc.rs:239)
==20136==    by 0x10AD3C: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (in /home/user/try/target/release/try)
==20136==    by 0x109FF0: try::main (in /home/user/try/target/release/try)
==20136==    by 0x10A075: std::rt::lang_start::{{closure}} (in /home/user/try/target/release/try)
==20136==    by 0x110515: {{closure}} (rt.rs:49)
==20136==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==20136==    by 0x11243E: {{closure}} (rt.rs:49)
==20136==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==20136==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==20136==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==20136==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==20136==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==20136==    by 0x10A050: main (in /home/user/try/target/release/try)
==20136== 
==20136== Conditional jump or move depends on uninitialised value(s)
==20136==    at 0x483147B: malloc (vg_replace_malloc.c:309)
==20136==    by 0x111D29: alloc (alloc.rs:10)
==20136==    by 0x111D29: __rdl_alloc (alloc.rs:239)
==20136==    by 0x10AD3C: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (in /home/user/try/target/release/try)
==20136==    by 0x109FF0: try::main (in /home/user/try/target/release/try)
==20136==    by 0x10A075: std::rt::lang_start::{{closure}} (in /home/user/try/target/release/try)
==20136==    by 0x110515: {{closure}} (rt.rs:49)
==20136==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==20136==    by 0x11243E: {{closure}} (rt.rs:49)
==20136==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==20136==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==20136==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==20136==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==20136==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==20136==    by 0x10A050: main (in /home/user/try/target/release/try)
==20136== 
==20136== Conditional jump or move depends on uninitialised value(s)
==20136==    at 0x109FFA: try::main (in /home/user/try/target/release/try)
==20136==    by 0x10A075: std::rt::lang_start::{{closure}} (in /home/user/try/target/release/try)
==20136==    by 0x110515: {{closure}} (rt.rs:49)
==20136==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==20136==    by 0x11243E: {{closure}} (rt.rs:49)
==20136==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==20136==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==20136==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==20136==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==20136==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==20136==    by 0x10A050: main (in /home/user/try/target/release/try)
==20136== 
==20136== 
==20136== HEAP SUMMARY:
==20136==     in use at exit: 0 bytes in 0 blocks
==20136==   total heap usage: 11 allocs, 11 frees, 1,681 bytes allocated
==20136== 
==20136== All heap blocks were freed -- no leaks are possible
==20136== 
==20136== For counts of detected and suppressed errors, rerun with: -v
==20136== Use --track-origins=yes to see where uninitialised values come from
==20136== ERROR SUMMARY: 7 errors from 7 contexts (suppressed: 0 from 0)
@tspiteri
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After adding debug symbols to the release build

[profile.release]
debug = true

the output is

==4178== Memcheck, a memory error detector
==4178== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==4178== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info
==4178== Command: target/release/try
==4178== 
==4178== Conditional jump or move depends on uninitialised value(s)
==4178==    at 0x10A098: spec_extend<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1857)
==4178==    by 0x10A098: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (vec.rs:1845)
==4178==    by 0x10A940: from_iter<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1731)
==4178==    by 0x10A940: collect<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>,alloc::vec::Vec<i32>> (iterator.rs:1465)
==4178==    by 0x10A940: try::main (main.rs:3)
==4178==    by 0x10AE05: std::rt::lang_start::{{closure}} (rt.rs:64)
==4178==    by 0x110515: {{closure}} (rt.rs:49)
==4178==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==4178==    by 0x11243E: {{closure}} (rt.rs:49)
==4178==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==4178==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==4178==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==4178==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==4178==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==4178==    by 0x10A9A6: main (in /home/user/try/target/release/try)
==4178==  Uninitialised value was created by a stack allocation
==4178==    at 0x10A8D1: try::main (main.rs:1)
==4178== 
==4178== Conditional jump or move depends on uninitialised value(s)
==4178==    at 0x10A793: reserve_internal<i32,alloc::alloc::Global> (raw_vec.rs:650)
==4178==    by 0x10A793: reserve<i32,alloc::alloc::Global> (raw_vec.rs:491)
==4178==    by 0x10A793: reserve<i32> (vec.rs:457)
==4178==    by 0x10A793: spec_extend<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1858)
==4178==    by 0x10A793: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (vec.rs:1845)
==4178==    by 0x10A940: from_iter<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1731)
==4178==    by 0x10A940: collect<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>,alloc::vec::Vec<i32>> (iterator.rs:1465)
==4178==    by 0x10A940: try::main (main.rs:3)
==4178==    by 0x10AE05: std::rt::lang_start::{{closure}} (rt.rs:64)
==4178==    by 0x110515: {{closure}} (rt.rs:49)
==4178==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==4178==    by 0x11243E: {{closure}} (rt.rs:49)
==4178==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==4178==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==4178==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==4178==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==4178==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==4178==    by 0x10A9A6: main (in /home/user/try/target/release/try)
==4178==  Uninitialised value was created by a stack allocation
==4178==    at 0x10A8D1: try::main (main.rs:1)
==4178== 
==4178== Conditional jump or move depends on uninitialised value(s)
==4178==    at 0x10A7B2: repeat (alloc.rs:242)
==4178==    by 0x10A7B2: array<i32> (alloc.rs:320)
==4178==    by 0x10A7B2: reserve_internal<i32,alloc::alloc::Global> (raw_vec.rs:659)
==4178==    by 0x10A7B2: reserve<i32,alloc::alloc::Global> (raw_vec.rs:491)
==4178==    by 0x10A7B2: reserve<i32> (vec.rs:457)
==4178==    by 0x10A7B2: spec_extend<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1858)
==4178==    by 0x10A7B2: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (vec.rs:1845)
==4178==    by 0x10A940: from_iter<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1731)
==4178==    by 0x10A940: collect<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>,alloc::vec::Vec<i32>> (iterator.rs:1465)
==4178==    by 0x10A940: try::main (main.rs:3)
==4178==    by 0x10AE05: std::rt::lang_start::{{closure}} (rt.rs:64)
==4178==    by 0x110515: {{closure}} (rt.rs:49)
==4178==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==4178==    by 0x11243E: {{closure}} (rt.rs:49)
==4178==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==4178==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==4178==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==4178==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==4178==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==4178==    by 0x10A9A6: main (in /home/user/try/target/release/try)
==4178==  Uninitialised value was created by a stack allocation
==4178==    at 0x10A8D1: try::main (main.rs:1)
==4178== 
==4178== Conditional jump or move depends on uninitialised value(s)
==4178==    at 0x10A7BC: map_err<core::alloc::Layout,core::alloc::LayoutErr,alloc::collections::CollectionAllocErr,closure> (result.rs:521)
==4178==    by 0x10A7BC: reserve_internal<i32,alloc::alloc::Global> (raw_vec.rs:659)
==4178==    by 0x10A7BC: reserve<i32,alloc::alloc::Global> (raw_vec.rs:491)
==4178==    by 0x10A7BC: reserve<i32> (vec.rs:457)
==4178==    by 0x10A7BC: spec_extend<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1858)
==4178==    by 0x10A7BC: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (vec.rs:1845)
==4178==    by 0x10A940: from_iter<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1731)
==4178==    by 0x10A940: collect<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>,alloc::vec::Vec<i32>> (iterator.rs:1465)
==4178==    by 0x10A940: try::main (main.rs:3)
==4178==    by 0x10AE05: std::rt::lang_start::{{closure}} (rt.rs:64)
==4178==    by 0x110515: {{closure}} (rt.rs:49)
==4178==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==4178==    by 0x11243E: {{closure}} (rt.rs:49)
==4178==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==4178==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==4178==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==4178==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==4178==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==4178==    by 0x10A9A6: main (in /home/user/try/target/release/try)
==4178==  Uninitialised value was created by a stack allocation
==4178==    at 0x10A8D1: try::main (main.rs:1)
==4178== 
==4178== Conditional jump or move depends on uninitialised value(s)
==4178==    at 0x111D1F: alloc (alloc.rs:9)
==4178==    by 0x111D1F: __rdl_alloc (alloc.rs:239)
==4178==    by 0x10A7CC: alloc (alloc.rs:81)
==4178==    by 0x10A7CC: alloc (alloc.rs:169)
==4178==    by 0x10A7CC: reserve_internal<i32,alloc::alloc::Global> (raw_vec.rs:668)
==4178==    by 0x10A7CC: reserve<i32,alloc::alloc::Global> (raw_vec.rs:491)
==4178==    by 0x10A7CC: reserve<i32> (vec.rs:457)
==4178==    by 0x10A7CC: spec_extend<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1858)
==4178==    by 0x10A7CC: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (vec.rs:1845)
==4178==    by 0x10A940: from_iter<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1731)
==4178==    by 0x10A940: collect<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>,alloc::vec::Vec<i32>> (iterator.rs:1465)
==4178==    by 0x10A940: try::main (main.rs:3)
==4178==    by 0x10AE05: std::rt::lang_start::{{closure}} (rt.rs:64)
==4178==    by 0x110515: {{closure}} (rt.rs:49)
==4178==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==4178==    by 0x11243E: {{closure}} (rt.rs:49)
==4178==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==4178==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==4178==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==4178==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==4178==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==4178==    by 0x10A9A6: main (in /home/user/try/target/release/try)
==4178==  Uninitialised value was created by a stack allocation
==4178==    at 0x10A8D1: try::main (main.rs:1)
==4178== 
==4178== Conditional jump or move depends on uninitialised value(s)
==4178==    at 0x483147B: malloc (vg_replace_malloc.c:309)
==4178==    by 0x111D29: alloc (alloc.rs:10)
==4178==    by 0x111D29: __rdl_alloc (alloc.rs:239)
==4178==    by 0x10A7CC: alloc (alloc.rs:81)
==4178==    by 0x10A7CC: alloc (alloc.rs:169)
==4178==    by 0x10A7CC: reserve_internal<i32,alloc::alloc::Global> (raw_vec.rs:668)
==4178==    by 0x10A7CC: reserve<i32,alloc::alloc::Global> (raw_vec.rs:491)
==4178==    by 0x10A7CC: reserve<i32> (vec.rs:457)
==4178==    by 0x10A7CC: spec_extend<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1858)
==4178==    by 0x10A7CC: <alloc::vec::Vec<T> as alloc::vec::SpecExtend<T,I>>::from_iter (vec.rs:1845)
==4178==    by 0x10A940: from_iter<i32,core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>> (vec.rs:1731)
==4178==    by 0x10A940: collect<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::chain::Chain<core::iter::adapters::Map<core::slice::Iter<i32>, closure>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>, core::iter::adapters::Map<core::slice::Iter<i32>, closure>>,alloc::vec::Vec<i32>> (iterator.rs:1465)
==4178==    by 0x10A940: try::main (main.rs:3)
==4178==    by 0x10AE05: std::rt::lang_start::{{closure}} (rt.rs:64)
==4178==    by 0x110515: {{closure}} (rt.rs:49)
==4178==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==4178==    by 0x11243E: {{closure}} (rt.rs:49)
==4178==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==4178==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==4178==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==4178==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==4178==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==4178==    by 0x10A9A6: main (in /home/user/try/target/release/try)
==4178==  Uninitialised value was created by a stack allocation
==4178==    at 0x10A8D1: try::main (main.rs:1)
==4178== 
==4178== Conditional jump or move depends on uninitialised value(s)
==4178==    at 0x10A94A: dealloc_buffer<i32,alloc::alloc::Global> (raw_vec.rs:708)
==4178==    by 0x10A94A: drop<i32,alloc::alloc::Global> (raw_vec.rs:718)
==4178==    by 0x10A94A: real_drop_in_place<alloc::raw_vec::RawVec<i32, alloc::alloc::Global>> (ptr.rs:195)
==4178==    by 0x10A94A: real_drop_in_place<alloc::vec::Vec<i32>> (ptr.rs:195)
==4178==    by 0x10A94A: try::main (main.rs:8)
==4178==    by 0x10AE05: std::rt::lang_start::{{closure}} (rt.rs:64)
==4178==    by 0x110515: {{closure}} (rt.rs:49)
==4178==    by 0x110515: std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:136)
==4178==    by 0x11243E: {{closure}} (rt.rs:49)
==4178==    by 0x11243E: std::panicking::try::do_call (panicking.rs:293)
==4178==    by 0x114087: __rust_maybe_catch_panic (lib.rs:85)
==4178==    by 0x112EC5: try<i32,closure> (panicking.rs:272)
==4178==    by 0x112EC5: catch_unwind<closure,i32> (panic.rs:394)
==4178==    by 0x112EC5: std::rt::lang_start_internal (rt.rs:48)
==4178==    by 0x10A9A6: main (in /home/user/try/target/release/try)
==4178==  Uninitialised value was created by a stack allocation
==4178==    at 0x10A8D1: try::main (main.rs:1)
==4178== 
==4178== 
==4178== HEAP SUMMARY:
==4178==     in use at exit: 0 bytes in 0 blocks
==4178==   total heap usage: 11 allocs, 11 frees, 1,681 bytes allocated
==4178== 
==4178== All heap blocks were freed -- no leaks are possible
==4178== 
==4178== For counts of detected and suppressed errors, rerun with: -v
==4178== ERROR SUMMARY: 7 errors from 7 contexts (suppressed: 0 from 0)

@jonas-schievink
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@tspiteri any reason to assume this is not a false positive? They usually are.

@tspiteri
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I was already kinda suspecting they were false positives, but wasn't aware they usually are so I opened the issue.

@jonas-schievink
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This looks very similar to #5856, so closing in favor of that, unless something indicates this is different.

@Noratrieb Noratrieb added O-x86_32 Target: x86 processors, 32 bit (like i686-*) and removed O-x86-all labels Oct 25, 2023
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O-x86_32 Target: x86 processors, 32 bit (like i686-*)
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