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2522191 - Instance does not appear in SM51, SAP processes are hanging, traces cannot be read

Symptom

  • Dispatcher, work processes are hanging
  • SM51: instance doesn't appear there
  • ls -al /usr/sap/SID/instance/work command just hanging
  • dev_disp cannot be opened
  • sapstack <PID> command cannot debug the process, just hanging
  • operating system debug tools (e.g. GDB) cannot debug the process, just hanging
  • in dmesg similar entries may appear like
     
    [36721.049838] [<ffffffffa0779fb0>] ? nfs4_xdr_dec_access+0xc0/0xc0 [nfsv4]
    [36721.049844] [<ffffffffa077a040>] ? nfs4_xdr_dec_getattr+0x90/0xa0 [nfsv4]
     
    [410068.065140] nfs: server <server name> not responding, still trying
     
  • df /usr/sap/SID/instance/work 
    and|or
    df /usr/sap/SID/instance/exe points to <server name> above, e.g.:
     
    df /usr/sap/SID/D04/work
    Filesystem 1K-blocks Used Available Use% Mounted on
    <server name>:/usr/sap/SID 25672704 6608896 17753088 28% /usr/sap/SID
     
    df /usr/sap/SID/D04/exe
    Filesystem 1K-blocks Used Available Use% Mounted on
    <server name>:/usr/sap/SID 25672704 6608896 17753088 28% /usr/sap/SID

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Environment

SAP on UNIX, Linux operating system

Keywords

hanging, NFS, NFSv3, NFSv4, dbg, gdb, local, sapstack , KBA , BC-OP-LNX , Linux , BC-CST , Client/Server Technology , BC-CST-DP , Dispatcher, Task Handler , BC-OP-AIX , IBM AIX , BC-OP-HPX , HP-UX , BC-OP-SUN , SUN Solaris , Problem

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