* [Bug tapsets/21353] New: syscall nesting in fcntl
@ 2017-04-04 17:26 dsmith at redhat dot com
2017-04-05 12:37 ` [Bug tapsets/21353] " mcermak at redhat dot com
0 siblings, 1 reply; 2+ messages in thread
From: dsmith at redhat dot com @ 2017-04-04 17:26 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=21353
Bug ID: 21353
Summary: syscall nesting in fcntl
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: ---
In [nd_]syscall.fcntl, there is some syscall nesting going on. The example
program from the syscall testsuite demonstrates the problem:
====
# gcc -m32 -o net1 net1.c
stap -e 'probe syscall.fcntl { printf("%s\n", ppfunc()) } probe
syscall.fcntl.return { printf("return\n") }' -c ./net1
SyS_fcntl
return
SyS_fcntl
return
SyS_fcntl
return
SyS_fcntl
return
compat_SyS_fcntl64
SyS_fcntl
return
return
compat_SyS_fcntl64
SyS_fcntl
return
return
compat_SyS_fcntl64
SyS_fcntl
return
return
compat_SyS_fcntl64
SyS_fcntl
return
return
compat_SyS_fcntl64
SyS_fcntl
return
return
====
So, both the compat call and the "real" call are getting hits. So, we're
getting 2 sets of probe hits for 1 fcntl() call.
I saw this with kernel-4.11.0-0.rc4.git2.1.fc27.x86_64 and HEAD systemtap.
This was originally reported by 'georgj' on #systemtap
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* [Bug tapsets/21353] syscall nesting in fcntl
2017-04-04 17:26 [Bug tapsets/21353] New: syscall nesting in fcntl dsmith at redhat dot com
@ 2017-04-05 12:37 ` mcermak at redhat dot com
0 siblings, 0 replies; 2+ messages in thread
From: mcermak at redhat dot com @ 2017-04-05 12:37 UTC (permalink / raw)
To: systemtap
https://sourceware.org/bugzilla/show_bug.cgi?id=21353
Martin Cermak <mcermak at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mcermak at redhat dot com
Assignee|systemtap at sourceware dot org |mcermak at redhat dot com
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2017-04-04 17:26 [Bug tapsets/21353] New: syscall nesting in fcntl dsmith at redhat dot com
2017-04-05 12:37 ` [Bug tapsets/21353] " mcermak at redhat dot com
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