#systemtap on 2020-06-09 — irc logs at freenode.irclog.whitequark.org

2015-11-12 23:18 fche changed the topic of #systemtap to: http://sourceware.org/systemtap; email systemtap@sourceware.org if answers here not timely, conversations may be logged

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05:54 <hassan64> I am getting error while compiling systemtap 4.2 with elfutils 0.178

05:54 <hassan64> configure: error: C++ compiler or dependencies not found, use --disable-debuginfod to disable.

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06:28 <hassan64> the above error is now gone with --enable-debuginfod

06:28 <hassan64> However, there is a warning while compiling the kernel code from script

06:30 <hassan64> Please look at my github: https://gist.github.com/hassan113/9509989fc58bae3264e5795bd86b8cdd

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07:01 <hassan64> dwarf_cfi_addrframe failed: unknown error

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13:38 <irker135> systemtap: wcohen systemtap.git:master * release-4.2-111-gefcfce4d7 / testsuite/systemtap.examples/profiling/container_check.stp: Add probes to container_check.stp for additional capabilities checks

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13:46 <hassan64> Why i am getting " unable to find local 'iov', [man error::dwarf] dieoffset 0xf62866 in kernel" by using "stap" command to cross compile systemtem script to *.ko

13:47 <hassan64> I have enabled CONFIG_DEBUG_INFO_DWARF4 in my kernel as well .

13:47 <hassan64> using systemtap ver: 4.3/0.179

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13:53 <hassan64> Systemtap does't show all the local variables in a kernel function, resulting [man error::dwarf]

13:54 <fche> hassan64, if your kernel is built from upstream sources, make sure you undo the kbuild bug that nukes debuginfo quality:

13:54 <fche> https://sourceware.org/legacy-ml/systemtap/2019-q2/msg00043.html

13:54 <fche> look at the -fno-var-tracking-assignments comment

13:54 <fche> hm time to add that to the man page

13:59 <irker135> systemtap: fche systemtap.git:master * release-4.2-112-ga5e6f4118 / man/error::dwarf.7stap: man error::dwar7: mention kbuild -fno-var-tracking-assignments

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14:05 <irker135> systemtap: yichun systemtap.git:fche/uprobes-rework * release-4.2-110-g85bbcefbe / runtime/linux/task_finder2.c: Bug: __stp_tf_quiesce_worker(): vma mmap callback incorrecty ran after process.begin callback

14:05 <irker135> systemtap: wcohen systemtap.git:fche/uprobes-rework * release-4.2-111-gefcfce4d7 / testsuite/systemtap.examples/profiling/container_check.stp: Add probes to container_check.stp for additional capabilities checks

14:05 <irker135> systemtap: fche systemtap.git:fche/uprobes-rework * release-4.2-112-ga5e6f4118 / man/error::dwarf.7stap: man error::dwar7: mention kbuild -fno-var-tracking-assignments

14:05 <irker135> systemtap: smakarov systemtap.git:fche/uprobes-rework * release-4.2-117-g4ede1f96e / : Merge remote-tracking branch 'origin/master' into fche/uprobes-rework

14:12 <hassan64> fche: I delete the "-fno-var-tracking-assignments" and rebuild my kernel. But sam eissue

14:12 <hassan64> semantic error: unable to find local 'iov', [man error::dwarf]

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14:46 <fche> the tapset code may need to be ported to the 4.19 kernel; some needs to look into what that $uiov variable is there and whether it's a substitute

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14:53 <fche> and similarly $uset

14:56 <hassan64> yes

14:57 <hassan64> is it an issue with latest systemtap, that unable to parse uset, uiov varaiables ?

14:58 <fche> it's that the tapset file doesn't try to access those variables

14:58 <fche> they must be in some kernel version we haven't encountered, so haven't asked stap to look for them

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15:21 <hassan64> any fix ?

15:36 <hassan64> so it is an issue to with kernel. Need to be ported to the kernel. Any kernel configuration that will allow it to be ported?

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15:57 <fche> hassan64,

15:58 <fche> try editing the .stp files in the the error message to change the $ variable names

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16:38 <irker135> systemtap: smakarov systemtap.git:master * release-4.2-113-g47bcb6be8 / buildrun.cxx runtime/linux/autoconf-proc_ops.c runtime/procfs-probes.c runtime/procfs.c runtime/transport/control.c runtime/transport/control.h runtime/transport/procfs.c: PR26099: adapt to struct proc_ops split from struct file_operations

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18:28 <hassan64> fche: I got your message regarding "tapset file doesn't try to access those variables".

18:28 <hassan64> you said: "try editing the .stp files in the the error message to change the $ variable names"

18:35 <hassan64> fche: What did you mean ?

19:10 <irker135> systemtap: fche systemtap.git:master * release-4.2-114-g7d13f15ea / session.cxx: session.cxx prerelease: declare support for kernel 5.7

19:20 <hassan64> i suspect that *struct old_timex32* was deleted from linux kernel a long time ago. As aresult tapset file does not access those variables.

19:21 <hassan64> systemtap is some how using this structure to process the variables

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20:25 <irker135> systemtap: fche systemtap.git:fche/uprobes-rework * release-4.2-118-gb66f36d0f / runtime/linux/uprobes-inode.c tapsets.cxx: TENTATIVE uprobes-inode: rework

20:42 <irker135> systemtap: fche systemtap.git:fche/uprobes-rework * release-4.2-119-g3f5de03c2 / runtime/linux/uprobes-inode.c: TENTATIVE uprobes-inode: rework

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