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1d86275225
# perf trace -e connec* ssh www.bla.com
connect(3</var/lib/sss/mc/passwd>, { .family: PF_LOCAL, path: /var/run/nscd/socket }, 110) = -1 ENOENT (No such file or directory)
connect(3</var/lib/sss/mc/passwd>, { .family: PF_LOCAL, path: /var/run/nscd/socket }, 110) = -1 ENOENT (No such file or directory)
connect(4<socket:[16610959]>, { .family: PF_LOCAL, path: /var/lib/sss/pipes/nss }, 110) = 0
connect(7, { .family: PF_LOCAL, path: /var/run/nscd/socket }, 110) = -1 ENOENT (No such file or directory)
connect(7, { .family: PF_LOCAL, path: /var/run/nscd/socket }, 110) = -1 ENOENT (No such file or directory)
connect(5, { .family: PF_LOCAL, path: /var/run/nscd/socket }, 110) = -1 ENOENT (No such file or directory)
connect(5</usr/lib64/libnss_mdns4_minimal.so.2>, { .family: PF_LOCAL, path: /var/run/nscd/socket }, 110) = -1 ENOENT (No such file or directory)
connect(5</usr/lib64/libnss_mdns4_minimal.so.2>, { .family: PF_INET, port: 53, addr: 192.168.44.1 }, 16) = 0
connect(5</usr/lib64/libnss_mdns4_minimal.so.2>, { .family: PF_INET, port: 22, addr: 146.112.61.108 }, 16) = 0
connect(5</usr/lib64/libnss_mdns4_minimal.so.2>, { .family: PF_INET6, port: 22, addr: ::ffff:146.112.61.108 }, 28) = 0
^Cconnect(5</usr/lib64/libnss_mdns4_minimal.so.2>, { .family: PF_INET, port: 22, addr: 146.112.61.108 }, 16) = -1 (unknown) (INTERNAL ERROR: strerror_r(512, [buf], 128)=22)
#
Argh, the SCA_FD needs to invalidate its cache when close is done...
It works if the 'close' syscall is not filtered out ;-\
# perf trace -e close,connec* ssh www.bla.com
close(3) = 0
close(3</usr/lib64/libpcre2-8.so.0.8.0>) = 0
close(3) = 0
close(3</usr/lib64/libkrb5.so.3.3>) = 0
close(3</usr/lib64/libkrb5.so.3.3>) = 0
close(3) = 0
close(3</usr/lib64/libk5crypto.so.3.1>) = 0
close(3</usr/lib64/libk5crypto.so.3.1>) = 0
close(3</usr/lib64/libcom_err.so.2.1>) = 0
close(3</usr/lib64/libcom_err.so.2.1>) = 0
close(3) = 0
close(3</usr/lib64/libkrb5support.so.0.1>) = 0
close(3</usr/lib64/libkrb5support.so.0.1>) = 0
close(3</usr/lib64/libkeyutils.so.1.8>) = 0
close(3</usr/lib64/libkeyutils.so.1.8>) = 0
close(3) = 0
close(3) = 0
close(3) = 0
close(3) = 0
close(4) = 0
close(3) = 0
close(3) = 0
connect(3</etc/nsswitch.conf>, { .family: PF_LOCAL, path: /var/run/nscd/socket }, 110) = -1 ENOENT (No such file or directory)
close(3</etc/nsswitch.conf>) = 0
connect(3</usr/lib64/libnss_sss.so.2>, { .family: PF_LOCAL, path: /var/run/nscd/socket }, 110) = -1 ENOENT (No such file or directory)
close(3</usr/lib64/libnss_sss.so.2>) = 0
close(3</usr/lib64/libnss_sss.so.2>) = 0
close(3) = 0
close(3) = 0
connect(4<socket:[16616519]>, { .family: PF_LOCAL, path: /var/lib/sss/pipes/nss }, 110) = 0
^C
#
Will disable this beautifier when 'close' is filtered out...
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-ekuiciyx4znchvy95c8p1yyi@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.