https://bugs.kde.org/show_bug.cgi?id=485400
Bug ID: 485400
Summary: io_uring filled memory not marked as defined
Classification: Developer tools
Product: valgrind
Version: 3.23 GIT
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: vlov...@gmail.com
Target Milestone: ---
Created attachment 168407
--> https://bugs.kde.org/attachment.cgi?id=168407&action=edit
Rust project reproducing the issue.
SUMMARY
Do some reads of a file with glommio & accessing the returned buffer causes
valgrind to complain that the data is uninitialized. My hunch is that valgrind
doesn't know to mark buffers filled by io_uring as defined.
STEPS TO REPRODUCE
1. Unzip the attached zipfile
2. cd repro
3. cargo build
4. valgrind target/debug/repro
OBSERVED RESULT
Valgrind has a false-positive complaint that the returned read buffer has
uninitialized data.
```
==2943183== Conditional jump or move depends on uninitialised value(s)
==2943183== at 0x144540: <usize as
core::iter::traits::accum::Sum>::sum::{{closure}} (accum.rs:53)
==2943183== by 0x15033D: core::iter::adapters::map::map_fold::{{closure}}
(map.rs:89)
==2943183== by 0x150664: <core::slice::iter::Iter<T> as
core::iter::traits::iterator::Iterator>::fold (macros.rs:232)
==2943183== by 0x150277: <core::iter::adapters::map::Map<I,F> as
core::iter::traits::iterator::Iterator>::fold (map.rs:129)
==2943183== by 0x1444C6: <usize as core::iter::traits::accum::Sum>::sum
(accum.rs:50)
==2943183== by 0x1502B2: core::iter::traits::iterator::Iterator::sum
(iterator.rs:3642)
==2943183== by 0x1454B5: repro::main::{{closure}} (main.rs:17)
==2943183== by 0x146F25: glommio::task::raw::RawTask<F,R,S>::run
(raw.rs:469)
==2943183== by 0x1DC63F: glommio::task::task_impl::Task::run
(task_impl.rs:125)
==2943183== by 0x200FAF:
glommio::executor::LocalExecutor::run_one_task_queue (mod.rs:1382)
==2943183== by 0x20059A: glommio::executor::LocalExecutor::run_task_queues
(mod.rs:1330)
==2943183== by 0x141379: glommio::executor::LocalExecutor::run::{{closure}}
(mod.rs:1483)
==2943183==
==2943183== Conditional jump or move depends on uninitialised value(s)
==2943183== at 0x145518: repro::main::{{closure}} (main.rs:18)
==2943183== by 0x146F25: glommio::task::raw::RawTask<F,R,S>::run
(raw.rs:469)
==2943183== by 0x1DC63F: glommio::task::task_impl::Task::run
(task_impl.rs:125)
==2943183== by 0x200FAF:
glommio::executor::LocalExecutor::run_one_task_queue (mod.rs:1382)
==2943183== by 0x20059A: glommio::executor::LocalExecutor::run_task_queues
(mod.rs:1330)
==2943183== by 0x141379: glommio::executor::LocalExecutor::run::{{closure}}
(mod.rs:1483)
==2943183== by 0x141901: glommio::executor::LocalExecutor::run::{{closure}}
(mod.rs:1518)
==2943183== by 0x148D00: scoped_tls::ScopedKey<T>::set (lib.rs:137)
==2943183== by 0x140BCD: glommio::executor::LocalExecutor::run (mod.rs:1518)
==2943183== by 0x145C23: repro::main (main.rs:4)
==2943183== by 0x14D8CA: core::ops::function::FnOnce::call_once
(function.rs:250)
==2943183== by 0x14E3AD:
std::sys_common::backtrace::__rust_begin_short_backtrace (backtrace.rs:155)
```
EXPECTED RESULT
The data is initialized.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: 6.8.1
(available in About System)
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.7.0
ADDITIONAL INFORMATION
valgrind --version
valgrind-3.23.0.GIT (valgrind-git-3.22.0.r243.g94e826519-1)
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