https://bugs.kde.org/show_bug.cgi?id=472219
Bug ID: 472219
Summary: Syscall param ppoll(ufds.events) points to
uninitialised byte(s)
Classification: Developer tools
Product: valgrind
Version: 3.21.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: fanqu...@gmail.com
Target Milestone: ---
aarch64 Alpine Linux (musl libc 1.2.4)
gcc (Alpine 12.2.1_git20220924-r10) 12.2.1 20220924
valgrind-3.21.0
Using the following code, compiled with "g++ test.cpp":
```cpp
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
int main(){
addrinfo ai_hint{};
ai_hint.ai_socktype = SOCK_STREAM;
ai_hint.ai_protocol = IPPROTO_TCP;
ai_hint.ai_family = AF_UNSPEC;
ai_hint.ai_flags = true? AI_ADDRCONFIG : AI_NUMERICHOST;
addrinfo* ai_res{nullptr};
return getaddrinfo("foo.bar", nullptr, &ai_hint, &ai_res);
}
```
valgrind -s --track-origins=yes --gen-suppressions=all ./a.out
==79== Memcheck, a memory error detector
==79== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==79== Using Valgrind-3.21.0 and LibVEX; rerun with -h for copyright info
==79== Command: ./a.out
==79==
==79== Syscall param ppoll(ufds.events) points to uninitialised byte(s)
==79== at 0x405DCCC: ??? (in /lib/ld-musl-aarch64.so.1)
==79== Address 0x1ffefff854 is on thread 1's stack
==79== Uninitialised value was created by a stack allocation
==79== at 0x404498C: ??? (in /lib/ld-musl-aarch64.so.1)
==79==
{
<insert_a_suppression_name_here>
Memcheck:Param
ppoll(ufds.events)
obj:/lib/ld-musl-aarch64.so.1
}
==79==
==79== HEAP SUMMARY:
==79== in use at exit: 0 bytes in 0 blocks
==79== total heap usage: 0 allocs, 0 frees, 0 bytes allocated
==79==
==79== All heap blocks were freed -- no leaks are possible
==79==
==79== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
==79==
==79== 1 errors in context 1 of 1:
==79== Syscall param ppoll(ufds.events) points to uninitialised byte(s)
==79== at 0x405DCCC: ??? (in /lib/ld-musl-aarch64.so.1)
==79== Address 0x1ffefff854 is on thread 1's stack
==79== Uninitialised value was created by a stack allocation
==79== at 0x404498C: ??? (in /lib/ld-musl-aarch64.so.1)
==79==
{
<insert_a_suppression_name_here>
Memcheck:Param
ppoll(ufds.events)
obj:/lib/ld-musl-aarch64.so.1
}
==79== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)
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