https://bugs.kde.org/show_bug.cgi?id=486488
Bug ID: 486488
Summary: poor handling of invalid --log-fd
Classification: Developer tools
Product: valgrind
Version: 3.24 GIT
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: o...@kde.org
Target Milestone: ---
> $ valgrind --log-fd=13 /bin/echo
> ==3786620== Valgrind: failed to move log file descriptor into safe range,
> using stderr
> ==3786620== Memcheck, a memory error detector
> [...]
> ==3786620== Warning: invalid file descriptor 2 in syscall close()
> ==3786620== Use --log-fd=<number> to select an alternative log fd.
> [...]
firstly, the error message is very unhelpful, as the root cause is that the
source descriptor is invalid.
secondly, the message should be separated with an empty line from the blurb
below, as otherwise it's way too easy to overlook.
lastly, these warning messages (there can be lots of them; the particular
syscalls vary depending on the traced program) make no sense; apparently
something doesn't get reset properly.
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