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* non-working .return probepoint from modules
@ 2021-12-15 20:51 Matt Vibrys
  2021-12-16 17:38 ` Matt Vibrys
  0 siblings, 1 reply; 7+ messages in thread
From: Matt Vibrys @ 2021-12-15 20:51 UTC (permalink / raw)
  To: systemtap

Hi Systemtap Team
   
my drm.stp script looks like following:
#+begin_src systemtap
  probe module("mymod").function("mymod_getparam_ioctl")
  {
    printf("-->. %s %s %s\n", thread_indent(0), ppfunc(), $$parms);
  }
     
  probe module("mymod").function("mymod_getparam_ioctl").return
  {
    printf("<--\n");
  }
#+end_src

roughly it traces call/return of ~mymod_getparam_ioctl~ symbol.

The symbol is non-static one:
#+begin_src C
  int mymod_getparam_ioctl(struct drm_device *dev, void *data,
                         struct drm_file *file_priv);
#+end_src

used like:
#+begin_src C
     DRM_IOCTL_DEF_DRV(MYMOD_GET_PARAMETER, mymod_getparam_ioctl, 0),
#+end_src
   
symbol is defined within module:
#+begin_src bash
  gmm@MY-HOST:~/user$ nm /lib/modules/5.13.0-22-generic/extra/mymod.ko | grep mymod_getparam_ioctl
  0000000000001010 T mymod_getparam_ioctl
#+end_src


The output below provides function calls, but it's silent about it's returns. Why so?:
#+begin_quote
gmm@MY-HOST:~/user$ sudo /opt/systemtap-4.6/bin/stap -vv /home/gmm/user/scripts/drm.stp
Systemtap translator/driver (version 4.6/0.176, non-git sources)
Copyright (C) 2005-2021 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
tested kernel versions: 2.6.32 ... 5.15.0-rc7
enabled features: BPF PYTHON3 LIBVIRT LIBXML2 NLS
Created temporary directory "/tmp/stapCRebKu"
Session arch: x86_64 release: 5.13.0-22-generic
Build tree: "/lib/modules/5.13.0-22-generic/build"
Kernel symbol table /lib/modules/5.13.0-22-generic/build/System.map unavailable, (No such file or directory)
Searched for library macro files: "/opt/systemtap-4.6/share/systemtap/tapset/linux", found: 7, processed: 7
Searched for library macro files: "/opt/systemtap-4.6/share/systemtap/tapset", found: 11, processed: 11
Searched: "/opt/systemtap-4.6/share/systemtap/tapset/linux/x86_64", found: 20, processed: 20
Searched: "/opt/systemtap-4.6/share/systemtap/tapset/linux", found: 407, processed: 407
Searched: "/opt/systemtap-4.6/share/systemtap/tapset/x86_64", found: 1, processed: 1
Searched: "/opt/systemtap-4.6/share/systemtap/tapset", found: 34, processed: 34
Pass 1: parsed user script and 480 library scripts using 121144virt/100392res/6124shr/94364data kb, in 100usr/10sys/113real ms.
derive-probes (location #0): module("mymod").function("mymod_getparam_ioctl") of keyword at /home/gmm/user/scripts/drm.stp:6:1
probe mymod_getparam_ioctl@/home/gmm/user/git/char-misc-mymod/drivers/gpu/drm/mymod/ioctl.c:142 module=mymod reloc=.text pc=0x11070
derive-probes (location #0): module("mymod").function("mymod_getparam_ioctl").return of keyword at /home/gmm/user/scripts/drm.stp:11:1
probe mymod_getparam_ioctl@/home/gmm/user/git/char-misc-mymod/drivers/gpu/drm/mymod/ioctl.c:142 module=mymod reloc=.text pc=0x11070
Pass 2: analyzed script: 2 probes, 12 functions, 1 embed, 2 globals using 123568virt/103804res/7068shr/96788data kb, in 10usr/10sys/22real ms.
function recursion-analysis: max-nesting 4  non-recursive
probe 0 ('module("mymod").function("mymod_getparam_ioctl@/home/gmm/user/git/char-misc-mymod/drivers/gpu/drm/mymod/ioctl.c:142")') locks __private__opt_systemtap_4_6_share_systemtap_tapset_indent_stp__indent_counters[rw] __private__opt_systemtap_4_6_share_systemtap_tapset_indent_stp__indent_timestamps[rw]
5 statements for probe probe_6335
probe 1 ('module("mymod").function("mymod_getparam_ioctl@/home/gmm/user/git/char-misc-mymod/drivers/gpu/drm/mymod/ioctl.c:142").return') locks nothing
1 statements for probe probe_6337
dump_unwindsyms mymod index=0 base=0x10000
Found build-id in mymod, length 20, start at 0x10
Pass 3: translated to C into "/tmp/stapCRebKu/stap_b4ca169e028eeab49ab6872384de1d4f_4617_src.c" using 123568virt/103944res/7208shr/96788data kb, in 10usr/0sys/8real ms.
Pass 4: using cached /root/.systemtap/cache/14/stapconf_14af95633f25eea4f38d1eb6ef710bb1_799.h
Running env -uARCH -uKBUILD_EXTMOD -uCROSS_COMPILE -uKBUILD_IMAGE -uKCONFIG_CONFIG -uINSTALL_PATH -uLD_LIBRARY_PATH PATH=/usr/bin:/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin make -C /lib/modules/5.13.0-22-generic/build M=/tmp/stapCRebKu modules CONFIG_DEBUG_INFO= CONFIG_DEBUG_INFO_BTF_MODULES= ARCH=x86_64 --no-print-directory -j21
  CC [M]  /tmp/stapCRebKu/stap_b4ca169e028eeab49ab6872384de1d4f_4617_src.o
  CC [M]  /tmp/stapCRebKu/stap_b4ca169e028eeab49ab6872384de1d4f_4617_aux_0.o
  CC [M]  /tmp/stapCRebKu/stap_symbols.o
  LD [M]  /tmp/stapCRebKu/stap_b4ca169e028eeab49ab6872384de1d4f_4617.o
  MODPOST /tmp/stapCRebKu/Module.symvers
  CC [M]  /tmp/stapCRebKu/stap_b4ca169e028eeab49ab6872384de1d4f_4617.mod.o
  LD [M]  /tmp/stapCRebKu/stap_b4ca169e028eeab49ab6872384de1d4f_4617.ko
Spawn waitpid result (0x0): 0
Pass 4: compiled C into "stap_b4ca169e028eeab49ab6872384de1d4f_4617.ko" in 1680usr/400sys/2072real ms.
Cleaning cache, interval reached 9711 s > 300 s.
Copying /tmp/stapCRebKu/stap_b4ca169e028eeab49ab6872384de1d4f_4617.ko to /root/.systemtap/cache/b4/stap_b4ca169e028eeab49ab6872384de1d4f_4617.ko
Copying /tmp/stapCRebKu/stap_b4ca169e028eeab49ab6872384de1d4f_4617_src.c to /root/.systemtap/cache/b4/stap_b4ca169e028eeab49ab6872384de1d4f_4617.c
Copying /tmp/stapCRebKu/stapconf_14af95633f25eea4f38d1eb6ef710bb1_799.h to /root/.systemtap/cache/14/stapconf_14af95633f25eea4f38d1eb6ef710bb1_799.h
Pass 5: starting run.
Running /opt/systemtap-4.6/bin/staprun -v -R /tmp/stapCRebKu/stap_b4ca169e028eeab49ab6872384de1d4f_4617.ko
staprun:insert_module:191 Module stap_b4ca169e028eeab49ab6872384de1d4f_3902 inserted from file /tmp/stapCRebKu/stap_b4ca169e028eeab49ab6872384de1d4f_4617.ko
-->.      0 mymod-test(3936): mymod_getparam_ioctl dev=0xffff9942117f5000 data=0xffffa452047dfd48 file_priv=0xffff994209352a00
-->.      0 mymod-test(3936): mymod_getparam_ioctl dev=0xffff9942117f5000 data=0xffffa452047dfd48 file_priv=0xffff994209352a00
-->.      0 mymod-test(3936): mymod_getparam_ioctl dev=0xffff9942117f5000 data=0xffffa452047dfe18 file_priv=0xffff994209352a00
-->.      0 mymod-test(3936): mymod_getparam_ioctl dev=0xffff9942117f5000 data=0xffffa452047dfdf8 file_priv=0xffff994209352a00
-->.      0 mymod-test(3936): mymod_getparam_ioctl dev=0xffff9942117f5000 data=0xffffa452047dfdf8 file_priv=0xffff994209352a00
  C-c C-cstapio:cleanup_and_exit:352 detach=0
stapio:cleanup_and_exit:369 closing control channel
staprun:remove_module:292 Module stap_b4ca169e028eeab49ab6872384de1d4f_3902 removed.
Spawn waitpid result (0x0): 0
Pass 5: run completed in 0usr/160sys/463082real ms.
Running rm -rf /tmp/stapCRebKu
Spawn waitpid result (0x0): 0
Removed temporary directory "/tmp/stapCRebKu"
#+end_quote


some info about config:
prompt$ cat /etc/os-release 
NAME="Ubuntu"
VERSION="20.04.1 LTS (Focal Fossa)"
ID=ubuntu


systemtap is compiled from sources:
prompt$ /opt/systemtap-4.6/bin/stap --version
Systemtap translator/driver (version 4.6/0.176, non-git sources)
Copyright (C) 2005-2021 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
tested kernel versions: 2.6.32 ... 5.15.0-rc7
enabled features: BPF PYTHON3 LIBVIRT LIBXML2 NLS

prompt$ uname -a
Linux MY-HOST 5.13.0-22-generic #22~20.04.1-Ubuntu SMP Tue Nov 9 15:07:24 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux


prompt$ dpkg --list | grep kernel | grep 5.13
ii  linux-headers-5.13.0-22-generic               5.13.0-22.22~20.04.1                  amd64        Linux kernel headers for version 5.13.0 on 64 bit x86 SMP
ii  linux-hwe-5.13-headers-5.13.0-22              5.13.0-22.22~20.04.1                  all          Header files related to Linux kernel version 5.13.0
ii  linux-image-5.13.0-22-generic-dbgsym          5.13.0-22.22~20.04.1                  amd64        Signed kernel image generic
ii  linux-image-unsigned-5.13.0-22-generic        5.13.0-22.22~20.04.1                  amd64        Linux kernel image for version 5.13.0 on 64 bit x86 SMP
ii  linux-image-unsigned-5.13.0-22-generic-dbgsym 5.13.0-22.22~20.04.1                  amd64        Linux kernel debug image for version 5.13.0 on 64 bit x86 SMP
ii  linux-modules-5.13.0-22-generic               5.13.0-22.22~20.04.1                  amd64        Linux kernel extra modules for version 5.13.0 on 64 bit x86 SMP
ii  linux-modules-extra-5.13.0-22-generic         5.13.0-22.22~20.04.1                  amd64        Linux kernel extra modules for version 5.13.0 on 64 bit x86 SMP


prompt$ apt-cache show linux-image-unsigned-5.13.0-22-generic
Package: linux-image-unsigned-5.13.0-22-generic
Architecture: amd64
Version: 5.13.0-22.22~20.04.1
Priority: optional
Section: kernel
Source: linux-hwe-5.13
Origin: Ubuntu
Maintainer: Ubuntu Kernel Team <kernel-team@lists.ubuntu.com>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 10132
Provides: aufs-dkms, fuse-module, ivtv-modules, kvm-api-4, linux-image, redhat-cluster-modules, spl-dkms, spl-modules, virtualbox-guest-modules, zfs-dkms, zfs-modules
Depends: kmod, linux-base (>= 4.5ubuntu1~16.04.1), linux-modules-5.13.0-22-generic
Recommends: grub-pc | grub-efi-amd64 | grub-efi-ia32 | grub | lilo, initramfs-tools | linux-initramfs-tool
Suggests: fdutils, linux-doc | linux-hwe-5.13-source-5.13.0, linux-hwe-5.13-tools, linux-headers-5.13.0-22-generic, linux-modules-extra-5.13.0-22-generic
Conflicts: linux-image-5.13.0-22-generic
Filename: pool/main/l/linux-hwe-5.13/linux-image-unsigned-5.13.0-22-generic_5.13.0-22.22~20.04.1_amd64.deb
Size: 10039156
MD5sum: eea929b583136567362a8439e976bcad
SHA1: 890c47a0a351dfa5b0cb024a1ff174735ab909c1
SHA256: 0bd9e89d9fd063b26f6aba7bba02311411f90826f71080fc31674dfd1b996739
SHA512: 5e1e33075767261d45b1219e3d2d6eb2388ed24cd06eda86f3c7fcb3a9519407a8b79721c77a00ac6a63293c16bb02265aea78f41686a69b41a2a0fb6f01a237
Description-en: Linux kernel image for version 5.13.0 on 64 bit x86 SMP
 This package contains the unsigned Linux kernel image for version 5.13.0 on
 64 bit x86 SMP.
 .
 Supports Generic processors.
 .
 Geared toward desktop and server systems.
 .
 You likely do not want to install this package directly. Instead, install
 the linux-generic meta-package, which will ensure that upgrades work
 correctly, and that supporting packages are also installed.
Description-md5: 467b5f7a4ed1e24f7128afd6453df516

what am I missing?

regards,
Matt

^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2022-04-06 12:37 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-12-15 20:51 non-working .return probepoint from modules Matt Vibrys
2021-12-16 17:38 ` Matt Vibrys
2021-12-17  2:33   ` Frank Ch. Eigler
2021-12-17 10:32     ` Matt Vibrys
2022-03-22  9:48       ` Matt Vibrys
2022-03-22 18:56         ` Frank Ch. Eigler
2022-04-06 12:37           ` Matt Vibrys

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