* [Bug tapsets/22109] New: on rawhide, we're getting errors in the nfsd tapset
@ 2017-09-07 18:22 dsmith at redhat dot com
2017-09-07 19:16 ` [Bug tapsets/22109] " dsmith at redhat dot com
0 siblings, 1 reply; 2+ messages in thread
From: dsmith at redhat dot com @ 2017-09-07 18:22 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=22109
Bug ID: 22109
Summary: on rawhide, we're getting errors in the nfsd tapset
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: tapsets
Assignee: systemtap at sourceware dot org
Reporter: dsmith at redhat dot com
Target Milestone: ---
On rawhide (4.13.0-0.rc7.git4.1.fc28.x86_64), we're getting errors like these
when using the nfsd tapset:
====
# stap -p4 ../src.copy/testsuite/buildok/nfsd-detailed.stp
semantic error: while processing probe
module("nfsd").function("nfsd_proc_lookup@fs/nfsd/nfsproc.c:127") from:
nfsd.proc2.lookup from: nfsd.proc2.lookup
semantic error: not accessible at this address (pc: 0x15935) [man
error::dwarf]: identifier '$argp' at
/usr/local/share/systemtap/tapset/linux/nfsd.stp:268:15
dieoffset: 0x7e86b from
/usr/lib/debug/lib/modules/4.13.0-0.rc7.git4.1.fc28.x86_64/kernel/fs/nfsd/nfsd.ko.debug
function: nfsd_proc_lookup at fs/nfsd/nfsproc.c:128
alternative locations: [0x15950,0x15a38], [0x15a3e,0x15a72]
source: fh = & @cast($argp, "nfsd_diropargs",
"kernel:nfsd")->fh
^
semantic error: not accessible at this address (pc: 0x15935) [man
error::dwarf]: identifier '$argp' at :268:15
dieoffset: 0x7e86b from
/usr/lib/debug/lib/modules/4.13.0-0.rc7.git4.1.fc28.x86_64/kernel/fs/nfsd/nfsd.ko.debug
function: nfsd_proc_lookup at fs/nfsd/nfsproc.c:128
alternative locations: [0x15950,0x15a38], [0x15a3e,0x15a72]
source: fh = & @cast($argp, "nfsd_diropargs",
"kernel:nfsd")->fh
^
Pass 2: analysis failed. [man error::pass2]
====
At first glance, those errors looked like bad debuginfo errors, but they
aren't.
The upstream kernel has changed from functions like the following (from a RHEL6
kernel):
====
static __be32
nfsd3_proc_create(struct svc_rqst *rqstp, struct nfsd3_createargs *argp,
struct nfsd3_diropres *resp)
{
... stuff deleted ...
}
====
To the following (from the current upstream kernel):
====
static __be32
nfsd3_proc_create(struct svc_rqst *rqstp)
{
struct nfsd3_createargs *argp = rqstp->rq_argp;
struct nfsd3_diropres *resp = rqstp->rq_resp;
... stuff deleted ...
}
====
The 'argp' and 'resp' arguments got removed, but locals with the same names
were created. Systemtap has been bravely attempting to use these locals (and
succeeding at times). When trying to access 'argp' in return probes, that
failed (as it should, since we can only access function parameters in return
probes, not local variables).
The nfsd tapset should be updated to handle these upstream kernel changes.
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* [Bug tapsets/22109] on rawhide, we're getting errors in the nfsd tapset
2017-09-07 18:22 [Bug tapsets/22109] New: on rawhide, we're getting errors in the nfsd tapset dsmith at redhat dot com
@ 2017-09-07 19:16 ` dsmith at redhat dot com
0 siblings, 0 replies; 2+ messages in thread
From: dsmith at redhat dot com @ 2017-09-07 19:16 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=22109
David Smith <dsmith at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from David Smith <dsmith at redhat dot com> ---
Fixed in commit 81f13a716.
--
You are receiving this mail because:
You are the assignee for the bug.
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