https://bugs.kde.org/show_bug.cgi?id=451626
Bug ID: 451626
Summary: Syscall param bpf(attr->raw_tracepoint.name) points to
unaddressable byte(s) in libbpf-tools
Product: valgrind
Version: 3.18.1
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: andr...@gerstmayr.me
Target Milestone: ---
SUMMARY
I'm seeing the following error for some libbpf-tools (runqlat, biolatency):
Syscall param bpf(attr->raw_tracepoint.name) points to unaddressable byte(s).
The programs are working as expected and I suspect this is a bug in valgrind.
STEPS TO REPRODUCE
dnf -y install clang valgrind
git clone --recursive https://github.com/iovisor/bcc.git
cd bcc/libbpf-tools
make runqlat biolatency
valgrind ./runqlat 1 1
valgrind ./biolatency 1 1
OBSERVED RESULT
[root@fedora libbpf-tools]# valgrind ./runqlat 1 1
==1591== Memcheck, a memory error detector
==1591== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==1591== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==1591== Command: ./runqlat 1 1
==1591==
--1591-- WARNING: unhandled eBPF command 35
--1591-- WARNING: unhandled eBPF command 35
--1591-- WARNING: unhandled eBPF command 35
--1591-- WARNING: unhandled eBPF command 35
--1591-- WARNING: unhandled eBPF command 35
--1591-- WARNING: unhandled eBPF command 35
--1591-- WARNING: unhandled eBPF command 35
--1591-- WARNING: unhandled eBPF command 35
==1591== Syscall param bpf(attr->raw_tracepoint.name) points to unaddressable
byte(s)
==1591== at 0x49A06BD: syscall (syscall.S:38)
==1591== by 0x4071E2: sys_bpf (bpf.c:74)
==1591== by 0x4071E2: sys_bpf_fd (bpf.c:82)
==1591== by 0x4071E2: bpf_raw_tracepoint_open (bpf.c:1130)
==1591== by 0x40FEC6: bpf_program__attach_btf_id (libbpf.c:10491)
==1591== by 0x41C02A: bpf_program__attach (libbpf.c:10659)
==1591== by 0x41C02A: bpf_object__attach_skeleton (libbpf.c:11803)
==1591== by 0x403A3A: runqlat_bpf__attach (runqlat.skel.h:114)
==1591== by 0x403A3A: main (runqlat.c:218)
==1591== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==1591==
Tracing run queue latency... Hit Ctrl-C to end.
usecs : count distribution
0 -> 1 : 0 | |
2 -> 3 : 1 |**** |
4 -> 7 : 6 |************************ |
8 -> 15 : 5 |******************** |
16 -> 31 : 5 |******************** |
32 -> 63 : 7 |**************************** |
64 -> 127 : 1 |**** |
128 -> 255 : 2 |******** |
256 -> 511 : 4 |**************** |
512 -> 1023 : 10 |****************************************|
==1591==
==1591== HEAP SUMMARY:
==1591== in use at exit: 0 bytes in 0 blocks
==1591== total heap usage: 151 allocs, 151 frees, 13,605,314 bytes allocated
==1591==
==1591== All heap blocks were freed -- no leaks are possible
==1591==
==1591== For lists of detected and suppressed errors, rerun with: -s
==1591== ERROR SUMMARY: 3 errors from 1 contexts (suppressed: 0 from 0)
[root@fedora libbpf-tools]# valgrind ./biolatency 1 1
==1752== Memcheck, a memory error detector
==1752== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==1752== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==1752== Command: ./biolatency 1 1
==1752==
--1752-- WARNING: unhandled eBPF command 35
--1752-- WARNING: unhandled eBPF command 35
--1752-- WARNING: unhandled eBPF command 35
--1752-- WARNING: unhandled eBPF command 35
--1752-- WARNING: unhandled eBPF command 35
--1752-- WARNING: unhandled eBPF command 35
--1752-- WARNING: unhandled eBPF command 35
--1752-- WARNING: unhandled eBPF command 35
==1752== Syscall param bpf(attr->raw_tracepoint.name) points to unaddressable
byte(s)
==1752== at 0x49A06BD: syscall (syscall.S:38)
==1752== by 0x4073B2: sys_bpf (bpf.c:74)
==1752== by 0x4073B2: sys_bpf_fd (bpf.c:82)
==1752== by 0x4073B2: bpf_raw_tracepoint_open (bpf.c:1130)
==1752== by 0x410096: bpf_program__attach_btf_id (libbpf.c:10491)
==1752== by 0x403ABA: main (biolatency.c:318)
==1752== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==1752==
==1752== Syscall param bpf(attr->raw_tracepoint.name) points to unaddressable
byte(s)
==1752== at 0x49A06BD: syscall (syscall.S:38)
==1752== by 0x4073B2: sys_bpf (bpf.c:74)
==1752== by 0x4073B2: sys_bpf_fd (bpf.c:82)
==1752== by 0x4073B2: bpf_raw_tracepoint_open (bpf.c:1130)
==1752== by 0x410096: bpf_program__attach_btf_id (libbpf.c:10491)
==1752== by 0x403AD0: main (biolatency.c:324)
==1752== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==1752==
Tracing block device I/O... Hit Ctrl-C to end.
usecs : count distribution
0 -> 1 : 0 | |
2 -> 3 : 0 | |
4 -> 7 : 0 | |
8 -> 15 : 0 | |
16 -> 31 : 0 | |
32 -> 63 : 0 | |
64 -> 127 : 0 | |
128 -> 255 : 2 |****************************************|
256 -> 511 : 1 |******************** |
512 -> 1023 : 1 |******************** |
1024 -> 2047 : 1 |******************** |
2048 -> 4095 : 1 |******************** |
4096 -> 8191 : 1 |******************** |
==1752==
==1752== HEAP SUMMARY:
==1752== in use at exit: 0 bytes in 0 blocks
==1752== total heap usage: 169 allocs, 169 frees, 13,601,324 bytes allocated
==1752==
==1752== All heap blocks were freed -- no leaks are possible
==1752==
==1752== For lists of detected and suppressed errors, rerun with: -s
==1752== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
EXPECTED RESULT
No 'Syscall param bpf(attr->raw_tracepoint.name) points to unaddressable
byte(s)' errors.
SOFTWARE/OS VERSIONS
Linux: Fedora 36
Valgrind: valgrind-3.18.1-9.fc36.x86_64
bcc: commit d1b1b61ceaee16e9d68e3c66e3ebddd55ba36d0f
libbpf: commit d6783c28b40e8355d2e3bd4a8141b88da7704f6d (libbpf is embedded in
the bcc repository as a git submodule)
ADDITIONAL INFORMATION
The source lines in question which point to unaddressable bytes according to
valgrind:
https://github.com/libbpf/libbpf/blob/d6783c28b40e8355d2e3bd4a8141b88da7704f6d/src/bpf.c#L1126-L1130
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