https://bugs.kde.org/show_bug.cgi?id=445011
Bug ID: 445011
Summary: SIGCHLD is sent when valgrind is used and
getservbyname() function is invoked on Fedora 35
Product: valgrind
Version: unspecified
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: memcheck
Assignee: jsew...@acm.org
Reporter: vladislavs.sokure...@gmail.com
Target Milestone: ---
Created attachment 143235
--> https://bugs.kde.org/attachment.cgi?id=143235&action=edit
small program to reproduce the issue
SUMMARY
SIGCHLD is sent when valgrind is used, this makes application think that some
child process has unexpectedly crashed. Note that no such signal is sent when
older valgrind is used or when valgrind is not used
valgrind-3.18.1 (all versions after 3.0.16)
gcc (GCC) 11.2.1 20210728 (Red Hat 11.2.1-1)
Linux localhost.localdomain 5.14.15-300.fc35.x86_64 #1 SMP Wed Oct 27 15:53:39
UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Fedora release 35 (Thirty Five)
STEPS TO REPRODUCE
1. gcc sigchld.c; valgrind --leak-check=full --trace-children=yes
--track-origins=yes --read-var-info=yes --leak-resolution=high ./a.out
OBSERVED RESULT
==274919== Memcheck, a memory error detector
==274919== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==274919== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==274919== Command: ./a.out
==274919==
One child process died (PID:274926,exitcode/signal:0). Exiting ...
One child process died (PID:274927,exitcode/signal:0). Exiting ...
==274919==
==274919== HEAP SUMMARY:
==274919== in use at exit: 0 bytes in 0 blocks
==274919== total heap usage: 192 allocs, 192 frees, 27,887 bytes allocated
==274919==
==274919== All heap blocks were freed -- no leaks are possible
==274919==
==274919== For lists of detected and suppressed errors, rerun with: -s
==274919== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
EXPECTED RESULT
No SIGCHLD is sent so application does not assume that some child process has
exited.
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