Re: RH 7 nfs-utils update causes segfault

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On 03/08/2016 01:21 PM, Benjamin Coddington wrote:

That's weird -- you're getting SIG37 - I don't know what that could be.  Can
you just do another 'continue' there?  If not, can you do 'ptype $_siginfo'
there?

Here's a new gdb session:

GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-80.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Attaching to process 464
Reading symbols from /usr/sbin/rpc.gssd...Reading symbols from /usr/lib/debug/usr/sbin/rpc.gssd.debug...done.
done.
Reading symbols from /lib64/libtirpc.so.1...Reading symbols from /lib64/libtirpc.so.1...(no debugging symbols found)...done.
(no debugging symbols found)...done.
Loaded symbols for /lib64/libtirpc.so.1
Reading symbols from /lib64/libgssapi_krb5.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libgssapi_krb5.so.2.2.debug...done.
done.
Loaded symbols for /lib64/libgssapi_krb5.so.2
Reading symbols from /lib64/libkrb5.so.3...Reading symbols from /usr/lib/debug/usr/lib64/libkrb5.so.3.3.debug...done.
done.
Loaded symbols for /lib64/libkrb5.so.3
Reading symbols from /lib64/libk5crypto.so.3...Reading symbols from /usr/lib/debug/usr/lib64/libk5crypto.so.3.1.debug...done.
done.
Loaded symbols for /lib64/libk5crypto.so.3
Reading symbols from /lib64/libcom_err.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libcom_err.so.2.1.debug...done.
done.
Loaded symbols for /lib64/libcom_err.so.2
Reading symbols from /lib64/libc.so.6...Reading symbols from /usr/lib/debug/usr/lib64/libc-2.17.so.debug...done.
done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/libnsl.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libnsl-2.17.so.debug...done.
done.
Loaded symbols for /lib64/libnsl.so.1
Reading symbols from /lib64/libpthread.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libpthread-2.17.so.debug...done.
done.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /lib64/libkrb5support.so.0...Reading symbols from /usr/lib/debug/usr/lib64/libkrb5support.so.0.1.debug...done.
done.
Loaded symbols for /lib64/libkrb5support.so.0
Reading symbols from /lib64/libdl.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libdl-2.17.so.debug...done.
done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /lib64/libkeyutils.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libkeyutils.so.1.5.debug...done.
done.
Loaded symbols for /lib64/libkeyutils.so.1
Reading symbols from /lib64/libresolv.so.2...Reading symbols from /usr/lib/debug/usr/lib64/libresolv-2.17.so.debug...done.
done.
Loaded symbols for /lib64/libresolv.so.2
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/usr/lib64/ld-2.17.so.debug...done.
done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/libselinux.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libselinux.so.1.debug...done.
done.
Loaded symbols for /lib64/libselinux.so.1
Reading symbols from /lib64/libpcre.so.1...Reading symbols from /lib64/libpcre.so.1...(no debugging symbols found)...done.
(no debugging symbols found)...done.
Loaded symbols for /lib64/libpcre.so.1
Reading symbols from /lib64/liblzma.so.5...Reading symbols from /lib64/liblzma.so.5...(no debugging symbols found)...done.
(no debugging symbols found)...done.
Loaded symbols for /lib64/liblzma.so.5
Reading symbols from /usr/lib64/gssproxy/proxymech.so...Reading symbols from /usr/lib/debug/usr/lib64/gssproxy/proxymech.so.debug...done.
done.
Loaded symbols for /usr/lib64/gssproxy/proxymech.so
Reading symbols from /lib64/libgssrpc.so.4...Reading symbols from /usr/lib/debug/usr/lib64/libgssrpc.so.4.2.debug...done.
done.
Loaded symbols for /lib64/libgssrpc.so.4
0x00007f4c7041fbe9 in __GI_ppoll (fds=fds@entry=0x7f4c72c45b50, nfds=nfds@entry=1024, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x7ffd00c8b7d0)
    at ../sysdeps/unix/sysv/linux/ppoll.c:51
51 result = INLINE_SYSCALL (ppoll, 5, fds, nfds, timeout, sigmask, _NSIG / 8); Missing separate debuginfos, use: debuginfo-install libtirpc-0.2.4-0.6.el7.x86_64 pcre-8.32-15.el7.x86_64 xz-libs-5.1.2-12alpha.el7.x86_64
(gdb) continue
Continuing.

Program received signal SIG37, Real-time event 37.
0x00007f4c7041fbe9 in __GI_ppoll (fds=fds@entry=0x7f4c72c45b50, nfds=nfds@entry=1024, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x7ffd00c8b7d0)
    at ../sysdeps/unix/sysv/linux/ppoll.c:51
51 result = INLINE_SYSCALL (ppoll, 5, fds, nfds, timeout, sigmask, _NSIG / 8);
(gdb) bt
#0 0x00007f4c7041fbe9 in __GI_ppoll (fds=fds@entry=0x7f4c72c45b50, nfds=nfds@entry=1024, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x7ffd00c8b7d0)
    at ../sysdeps/unix/sysv/linux/ppoll.c:51
#1 0x00007f4c714ab587 in ppoll (__ss=0x7ffd00c8b7d0, __timeout=0x0, __nfds=1024, __fds=0x7f4c72c45b50) at /usr/include/bits/poll2.h:77
#2  gssd_poll (nfds=1024, fds=0x7f4c72c45b50) at gssd_main_loop.c:194
#3  gssd_run () at gssd_main_loop.c:258
#4 0x00007f4c714aa11a in main (argc=<optimized out>, argv=0x7ffd00c8ba38) at gssd.c:216
(gdb) continue
Continuing.

Program received signal SIG37, Real-time event 37.
0x00007f4c7041fbe9 in __GI_ppoll (fds=fds@entry=0x7f4c72c45b50, nfds=nfds@entry=1024, timeout=<optimized out>, timeout@entry=0x0, sigmask=sigmask@entry=0x7ffd00c8b7d0)
    at ../sysdeps/unix/sysv/linux/ppoll.c:51
51 result = INLINE_SYSCALL (ppoll, 5, fds, nfds, timeout, sigmask, _NSIG / 8);
(gdb) ptype $_siginfo
type = struct {
    int si_signo;
    int si_errno;
    int si_code;
    union {
        int _pad __attribute__ ((vector_size(28)));
        struct {...} _kill;
        struct {...} _timer;
        struct {...} _rt;
        struct {...} _sigchld;
        struct {...} _sigfault;
        struct {...} _sigpoll;
    } _sifields;
}


In order to keep the gssd process alive (to be able to attach gbd to it), I've commented out my nfs mounts in vfstab & am then mounting the export manually:

$ sudo mount /my/mountpoint
Error getting authority: Error initializing authority: Error calling StartServiceByName for org.freedesktop.PolicyKit1: Timeout was reached (g-io-error-quark, 24)
Failed to start rpc-statd.service: Connection timed out
mount.nfs: access denied by server while mounting nfsserver:/the_export

$ systemctl --failed
  UNIT           LOAD   ACTIVE SUB    DESCRIPTION
 polkit.service loaded failed failed Authorization Manager


I see now that when mounting manually this way, the gss daemon actually doesn't die. The rpc-statd process the mount whines about failing to start *is* running.

-Mark
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