From: Matt Vibrys <vibrys@o2.pl>
To: "Frank Ch. Eigler" <fche@redhat.com>
Cc: systemtap@sourceware.org
Subject: Re: non-working .return probepoint from modules
Date: Fri, 17 Dec 2021 11:32:38 +0100 [thread overview]
Message-ID: <umt4zgozr06x.fsf@o2.pl> (raw)
In-Reply-To: <87mtl0aqhn.fsf@redhat.com>
Frank Ch. Eigler <fche@redhat.com> writes:
>>> The output below provides function calls, but it's silent about it's
>>> returns. Why so?:
>
> Good question, I wonder too!
>
>>> 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)
>>> [...]
>
> This is good, it contains the module-insertion fix PR28557.
> The stap console trace looks okay.
>
>> For better insight I've used drm module drm_ioctl function
>> instead. The problem persists, ie .return "locks nothing":
>> #+begin_src systemtap
>> probe module("drm").function("drm_ioctl")
>> {
>> printf("-->. %s %s %s\n", thread_indent(0), ppfunc(), $$parms);
>> }
>>
>> probe module("drm").function("drm_ioctl").return
>> {
>> printf("<--\n");
>> }
>
> Would you consider rerunning a bit more pass-5 runtime side
> tracing such as
>
> % sudo stap -DDEBUG_KPROBES -DDEBUG_SYMBOLS [...]
>
>
> - FChE
Hi Frank,
thank You for response.
here's the output:
#+begin_src bash
prompt$ sudo /opt/systemtap-4.6/bin/stap -vv -DDEBUG_KPROBES -DDEBUG_SYMBOLS ~/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/staprnTrv2"
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 121164virt/100540res/6252shr/94384data kb, in 100usr/20sys/115real ms.
derive-probes (location #0): module("drm").function("drm_ioctl") of keyword at /home/gmm/user/scripts/drm.stp:16:1
probe drm_ioctl@/build/linux-hwe-5.13-ADyN9x/linux-hwe-5.13-5.13.0/drivers/gpu/drm/drm_ioctl.c:811 module=drm reloc=.text pc=0x143b0
derive-probes (location #0): module("drm").function("drm_ioctl").return of keyword at /home/gmm/user/scripts/drm.stp:21:1
probe drm_ioctl@/build/linux-hwe-5.13-ADyN9x/linux-hwe-5.13-5.13.0/drivers/gpu/drm/drm_ioctl.c:811 module=drm reloc=.text pc=0x143b0
Pass 2: analyzed script: 2 probes, 12 functions, 1 embed, 2 globals using 124932virt/105328res/7236shr/98152data kb, in 130usr/0sys/135real ms.
function recursion-analysis: max-nesting 4 non-recursive
probe 0 ('module("drm").function("drm_ioctl@/build/linux-hwe-5.13-ADyN9x/linux-hwe-5.13-5.13.0/drivers/gpu/drm/drm_ioctl.c:811")') 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("drm").function("drm_ioctl@/build/linux-hwe-5.13-ADyN9x/linux-hwe-5.13-5.13.0/drivers/gpu/drm/drm_ioctl.c:811").return') locks nothing
1 statements for probe probe_6337
dump_unwindsyms drm index=0 base=0x10000
Found build-id in drm, length 20, start at 0x10
Pass 3: translated to C into "/tmp/staprnTrv2/stap_33df05986440b0b57b4062d608cf18eb_4656_src.c" using 124932virt/105456res/7364shr/98152data kb, in 120usr/10sys/121real 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/staprnTrv2 modules CONFIG_DEBUG_INFO= CONFIG_DEBUG_INFO_BTF_MODULES= ARCH=x86_64 --no-print-directory -j21
CC [M] /tmp/staprnTrv2/stap_33df05986440b0b57b4062d608cf18eb_4656_src.o
CC [M] /tmp/staprnTrv2/stap_33df05986440b0b57b4062d608cf18eb_4656_aux_0.o
CC [M] /tmp/staprnTrv2/stap_symbols.o
LD [M] /tmp/staprnTrv2/stap_33df05986440b0b57b4062d608cf18eb_4656.o
MODPOST /tmp/staprnTrv2/Module.symvers
CC [M] /tmp/staprnTrv2/stap_33df05986440b0b57b4062d608cf18eb_4656.mod.o
LD [M] /tmp/staprnTrv2/stap_33df05986440b0b57b4062d608cf18eb_4656.ko
Spawn waitpid result (0x0): 0
Pass 4: compiled C into "stap_33df05986440b0b57b4062d608cf18eb_4656.ko" in 1400usr/360sys/1637real ms.
Cleaning cache, interval reached 61190 s > 300 s.
Copying /tmp/staprnTrv2/stap_33df05986440b0b57b4062d608cf18eb_4656.ko to /root/.systemtap/cache/33/stap_33df05986440b0b57b4062d608cf18eb_4656.ko
Copying /tmp/staprnTrv2/stap_33df05986440b0b57b4062d608cf18eb_4656_src.c to /root/.systemtap/cache/33/stap_33df05986440b0b57b4062d608cf18eb_4656.c
Copying /tmp/staprnTrv2/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/staprnTrv2/stap_33df05986440b0b57b4062d608cf18eb_4656.ko
staprun:insert_module:191 Module stap_33df05986440b0b57b4062d608cf18e_10362 inserted from file /tmp/staprnTrv2/stap_33df05986440b0b57b4062d608cf18eb_4656.ko
_stp_set_stext:44: found kernel _stext load address: 0xffffffff8bc00000
_stp_kmodule_update_address:1115: module drm section .altinstr_aux address 0xffffffffc05684e2
_stp_kmodule_update_address:1115: module drm section .altinstr_replacement address 0xffffffffc0568075
_stp_kmodule_update_address:1115: module drm section .altinstructions address 0xffffffffc057cb54
_stp_kmodule_update_address:1115: module drm section .bss address 0xffffffffc0588d80
_stp_kmodule_update_address:1115: module drm section .data address 0xffffffffc0587000
_stp_kmodule_update_address:1115: module drm section .data..read_mostly address 0xffffffffc05886f4
_stp_kmodule_update_address:1115: module drm section .data.once address 0xffffffffc05886ec
_stp_kmodule_update_address:1115: module drm section .gnu.linkonce.this_module address 0xffffffffc0588a00
_stp_kmodule_update_address:1115: module drm section .init.text address 0x0
_stp_kmodule_update_address:1102: module drm special section .note.gnu.build-id address 0xffffffffc0569000
_stp_kmodule_update_address:1115: module drm section .parainstructions address 0xffffffffc057c608
_stp_kmodule_update_address:1115: module drm section .ref.data address 0xffffffffc0588780
_stp_kmodule_update_address:1115: module drm section .rodata address 0xffffffffc056b080
_stp_kmodule_update_address:1115: module drm section .rodata.str1.1 address 0xffffffffc057d760
_stp_kmodule_update_address:1115: module drm section .rodata.str1.8 address 0xffffffffc05801c0
_stp_kmodule_update_address:1115: module drm section .smp_locks address 0xffffffffc057c3ac
_stp_kmodule_update_address:1115: module drm section .static_call.text address 0xffffffffc0568518
_stp_kmodule_update_address:1115: module drm section .static_call_sites address 0xffffffffc05889e0
_stp_kmodule_update_address:1115: module drm section .text address 0xffffffffc0534000
_stp_kmodule_update_address:1115: module drm section .text.unlikely address 0xffffffffc0568191
_stp_kmodule_update_address:1115: module drm section ___srcu_struct_ptrs address 0xffffffffc05855b0
_stp_kmodule_update_address:1115: module drm section __bpf_raw_tp_map address 0xffffffffc0588700
_stp_kmodule_update_address:1115: module drm section __bug_table address 0xffffffffc0587ae0
_stp_kmodule_update_address:1115: module drm section __dyndbg address 0xffffffffc05889a8
_stp_kmodule_update_address:1115: module drm section __jump_table address 0xffffffffc0586000
_stp_kmodule_update_address:1115: module drm section __kcrctab address 0xffffffffc056a86c
_stp_kmodule_update_address:1115: module drm section __kcrctab_gpl address 0xffffffffc056aff0
_stp_kmodule_update_address:1115: module drm section __ksymtab address 0xffffffffc0569054
_stp_kmodule_update_address:1115: module drm section __ksymtab_gpl address 0xffffffffc056a6e0
_stp_kmodule_update_address:1115: module drm section __ksymtab_strings address 0xffffffffc0577430
_stp_kmodule_update_address:1115: module drm section __mcount_loc address 0xffffffffc057a6a4
_stp_kmodule_update_address:1115: module drm section __param address 0xffffffffc05855b8
_stp_kmodule_update_address:1115: module drm section __tracepoints address 0xffffffffc05888a0
_stp_kmodule_update_address:1115: module drm section __tracepoints_ptrs address 0xffffffffc0585680
_stp_kmodule_update_address:1115: module drm section __tracepoints_strings address 0xffffffffc0585690
_stp_kmodule_update_address:1115: module drm section _ftrace_events address 0xffffffffc0588760
_stp_module_check:775: build-id validation [drm]
_stp_build_id_check:731: build-id validation [drm] 4c8ebf4428e1562c2877a2be4c5f804cf306d2a3 vs. notes@=ffffffffc0569010 4c8ebf4428e1562c2877a2be4c5f804cf306d2a3
stapkp_init:756: looking up 2 probes
stapkp_init:770: found 2 probes
stapkp_register_probe:364: stapkp_register_probe module drm addr 0x4350 reg 0
stapkp_register_probe:364: stapkp_register_probe module drm addr 0x4350 reg 0
_stp_kmodule_relocate:38: drm, .text, 4350
_stp_kmodule_relocate:57: address=ffffffffc0538350
stapkp_arch_register_kprobe:230: +kprobe (null)+0
stapkp_register_kprobe:258: stapkp_register_kprobe module drm addr 0x4350 rc 0
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f200 cmd=0xc0406400 arg=0x19cf740
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f200 cmd=0xc0406400 arg=0x19cf740
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f200 cmd=0xc0106401 arg=0x7ffcb3a8ad10
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f200 cmd=0xc0106401 arg=0x7ffcb3a8ad10
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f200 cmd=0xc0086441 arg=0x19cf898
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f200 cmd=0xc0086441 arg=0x19cf818
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f200 cmd=0xc0086441 arg=0x19cf858
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f200 cmd=0xc0086441 arg=0x19cf7d8
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f500 cmd=0xc0406400 arg=0x19cd590
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f500 cmd=0xc0406400 arg=0x19cd590
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f500 cmd=0xc0106401 arg=0x7ffcb3a8ad10
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f500 cmd=0xc0106401 arg=0x7ffcb3a8ad10
-->. 0 myapp-test(10402): drm_ioctl filp=0xffff994332d2f500 cmd=0xc0086441 arg=0x19cf588
C-c C-cstapkp_batch_unregister_probes:514: -kprobe * 1
stapio:cleanup_and_exit:352 detach=0
stapio:cleanup_and_exit:369 closing control channel
staprun:remove_module:292 Module stap_33df05986440b0b57b4062d608cf18e_10362 removed.
Spawn waitpid result (0x0): 0
Pass 5: run completed in 20usr/90sys/50060real ms.
Running rm -rf /tmp/staprnTrv2
Spawn waitpid result (0x0): 0
Removed temporary directory "/tmp/staprnTrv2"
#+end_src
regards,
Matt
next prev parent reply other threads:[~2021-12-17 10:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-15 20:51 Matt Vibrys
2021-12-16 17:38 ` Matt Vibrys
2021-12-17 2:33 ` Frank Ch. Eigler
2021-12-17 10:32 ` Matt Vibrys [this message]
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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