[Bug 1795545] [NEW] Systemtap incompatible with ubuntu 18.04

[spbike]

On 10/19/18 2:38 PM, Frank Ch. Eigler wrote:
> Hi -
> 
> This commit appears to fix this problem.
> 
> https://sourceware.org/git/gitweb.cgi?p=systemtap.git;a=commitdiff;h=8bc64034509474bee3fb7996b2a9e74c8bc27281
> 


It tried it, here's that file with the patch:
        version = 4
        fh = & @nfsd4_compound_state($cstate)->current_fh

        if (@defined($u)) {
             count = $u->read->rd_length
             offset = $u->read->rd_offset
             vec = $rqstp->rq_vec
             vlen = $u->read->rd_vlen
        } else {
             count = $read->rd_length
             offset = $read->rd_offset
             vec = $rqstp->rq_vec
             vlen = $read->rd_vlen
        }


        uid = __rqstp_uid($rqstp)
        gid = __rqstp_gid($rqstp)

I installed systemtap-4.0, ran ./configure --prefix=/share/apps/systemtap-4.0;
make; make install

Then ran it:
root at nas-12-1:/share/apps/systemtap-4.0# ./bin/stap
./share/systemtap/examples/network/nfsd-trace.stp
semantic error: while processing probe
module("nfsd").function("nfsd4_commit@/build/linux-39dmni/linux-4.15.0/fs/nfsd/nfs4proc.c:579").call
from: nfsd.proc4.commit from: nfsd.proc.commit from: nfsd.proc.entries from:
nfsd.proc.entries

semantic error: failed to retrieve location attribute for 'commit' [man
error::dwarf]: identifier '$commit' at
/share/apps/systemtap-4.0/share/systemtap/tapset/linux/nfsd.stp:856:10
        dieoffset: 0x1b5709 from
/usr/lib/debug/lib/modules/4.15.0-36-generic/kernel/fs/nfsd/nfsd.ko
        function: nfsd4_commit at
/build/linux-39dmni/linux-4.15.0/fs/nfsd/nfs4proc.c:581
        source: 	count = $commit->co_count
                	        ^

semantic error: failed to retrieve location attribute for 'commit' [man
error::dwarf]: identifier '$commit' at :856:10
        dieoffset: 0x1b5709 from
/usr/lib/debug/lib/modules/4.15.0-36-generic/kernel/fs/nfsd/nfsd.ko
        function: nfsd4_commit at
/build/linux-39dmni/linux-4.15.0/fs/nfsd/nfs4proc.c:581
        source: 	count = $commit->co_count
                	        ^

Pass 2: analysis failed.  [man error::pass2]

I'll try building the current git version and see if that helps.

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https://bugs.launchpad.net/bugs/1795545

Title:
  Systemtap incompatible with ubuntu 18.04

Status in systemtap package in Ubuntu:
  New

Bug description:
  Under 16.04 I ran run:
  $ stap nfsd-trace.stp
  Mon Oct  1 19:48:05 2018 PDT 10.22.7.20:50434 nfsd.proc4.lookup grep /export/1/blank/build.2018-08-22/bin/grep

  Works great.

  Under 18.04 I tried:
  # stap nfsd-trace.stp
  semantic error: while processing probe module("nfsd").function("nfsd4_lookup@/build/linux-lZKWha/linux-4.15.0/fs/nfsd/nfs4proc.c:735").call from: nfsd.proc4.lookup from: nfsd.proc.lookup from: nfsd.proc.entries from: nfsd.proc.entries

  The kernel being used:
  Linux nas-7-0 4.15.0-22-generic #24-Ubuntu SMP Wed May 16 12:15:17 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

  I thought I might need a newer systemtap, so I installed it from git on Sept 27th 2018.  So the same run:
  /share/apps/systemtap-2018-09-27# ./bin/stap ./share/systemtap/examples/network/nfsd-trace.stp
  semantic error: while processing probe module("nfsd").function("nfsd4_read@/build/linux-lZKWha/linux-4.15.0/fs/nfsd/nfs4proc.c:744").call from: nfsd.proc4.read from: nfsd.proc.read from: nfsd.proc.entries from: nfsd.proc.entries

  Other scripts like iostats.stp work as expected.

  So basically from what I can tell the neither the ubuntu provided
  systemtap, nor the upstream systemtap works with the widely circulated
  nfsd-trace.stp file.  It's been available from redhat's documentation
  as well as part of the upstream source under examples.

  I expected the 18.04 result of "stap nfsd-trace.stp" to be much like
  the 16.04 result.  Showing a log of NFS related I/O, path names, time
  stamps, etc.

  Other NFS related scripts like nfsd-recent.stp works.

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