Your message dated Sun, 09 May 2021 05:13:06 -0700 (PDT) with message-id <[email protected]> and subject line Closing this bug (BTS maintenance for src:linux bugs) has caused the Debian Bug report #793409, regarding linux-tools-4.0: "perf_4.0 script" cannot display userspace call stacks to be marked as done.
This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact [email protected] immediately.) -- 793409: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=793409 Debian Bug Tracking System Contact [email protected] with problems
--- Begin Message ---Package: linux-tools-4.0 Version: 4.0.2-1 Severity: normal Dear maintainer, It seems "perf_4.0 script" cannot display userspace call stacks. Here's a simple program: ~~~c #include <stdlib.h> #include <string.h> int main() { size_t size = 20*1024*1024; void* buffer = malloc(size); for (int i=0; i != 10; ++i) { memset(buffer, 0, size); } return 0; } ~~~ Compiled with: ~~~sh gcc -g --std=c99 foo.c ~~~ I can correctly get call stack samples using perf_3.16 (it's working OK event on a 4.0 kernel): ~~~sh perf_3.16 record --call-graph dwarf ./a.out perf_3.16 script ~~~ I correctly get the call stacks such as: ~~~ a.out 3256 1378.470878: cycles: ffffffff812ddf97 clear_page_c ([kernel.kallsyms]) 7f35f647a720 memset (/lib/x86_64-linux-gnu/libc-2.19.so) 400584 main (/home/gabriel/temp/a.out) ~~~ Now using perf_4.0: ~~~sh perf_4.0 record --call-graph dwarf ./a.out perf_4.0 script ~~~ I get empty call stacks instead: ~~~ a.out 3314 1445.288362: 815975 cycles: ~~~ It seems to correctly manage to get kernelspace stacks however: ~~~ a.out 3314 1445.289513: 754329 cycles: ffffffff8156b020 page_fault ([kernel.kallsyms]) ~~~ The issue seems to be located in "perf_4.0 script" and not in "perf 4.0 record" as "perf_4.0 report" works correctly. -- Gabriel -- System Information: Debian Release: stretch/sid APT prefers testing APT policy: (500, 'testing'), (500, 'stable'), (90, 'unstable'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.0.0-2-amd64 (SMP w/2 CPU cores) Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages linux-tools-4.0 depends on: ii libaudit1 1:2.4.2-1 ii libc6 2.19-19 ii libc6-i386 2.19-19 ii libc6-x32 2.19-19 ii libdw1 0.159-4.2 ii libelf1 0.159-4.2 ii libnuma1 2.0.10-1 ii libperl5.20 5.20.2-6 ii libpython2.7 2.7.10-3 ii libslang2 2.3.0-2+b1 ii libunwind8 1.1-3.2 ii perl 5.20.2-6 ii zlib1g 1:1.2.8.dfsg-2+b1 Versions of packages linux-tools-4.0 recommends: ii linux-base 3.5 Versions of packages linux-tools-4.0 suggests: ii linux-doc-4.0 4.0.8-1 -- no debconf information
--- End Message ---
--- Begin Message ---Hi This bug was filed for a very old kernel or the bug is old itself without resolution. If you can reproduce it with - the current version in unstable/testing - the latest kernel from backports please reopen the bug, see https://www.debian.org/Bugs/server-control for details. Regards, Salvatore
--- End Message ---
