Re: /proc/PID/exe not restored on restart in 0.8.2

From: Paul H. Hargrove (PHHargrove_at_lbl_dot_gov)
Date: Wed Aug 26 2009 - 12:32:16 PDT

  • Next message: Josh Hursey: "Re: /proc/PID/exe not restored on restart in 0.8.2"
    Josh,
    
    The error you see building 0.8.1 is because it does not support a 
    2.6.29.6 kernel (supported 2.6.29, but the put_fs_struct change took 
    place somewhere in the 2.6.26.X series).
    
    I have tried 0.8.1 and 0.8.2 on 2.6.29 and 2.6.30 kernels and all three 
    valid combinations show the invalid /proc/pid/exe link.
    
    The problem does not appear to be dependent on BLCR version, and a quick 
    look at kernel sources suggest the problem may originate in a kernel 
    change between 2.6.25 and 2.6.26.  So, I suspect that if you use a 
    kernel 2.6.25 or older the symlink will be correct.
    
    If you have a moment, please enter a bug report for this.  Based on the 
    kernel change I noticed, this is probably less than a 1-day job to fix 
    and test, but I don't know when I'll be able to start.
    
    -Paul
    
    Josh Hursey wrote:
    > I have a Linux box running Fedora 11, and BLCR 0.8.2
    > ----------
    > shell$ uname -a
    > Linux cloud9 2.6.29.6-217.2.8.fc11.i586 #1 SMP Sat Aug 15 00:44:39 EDT 
    > 2009 i686 i686 i386 GNU/Linux
    > ----------
    >
    > I am finding that the /proc/PID/exe link is not restored on cr_restart 
    > (I used the counting example in the distribution). It is valid when 
    > running normally, but after restart the link is invalid (not pointing 
    > to anything).
    >
    > I believe that 0.8.1 was working correctly in this regard, but I 
    > cannot verify on this machine at the moment (build error 
    > cr_dest_file.c:189: error: implicit declaration of function 
    > ‘put_fs_struct’).
    >
    > Have others seen this problem? I can send along more info if that 
    > might help.
    >
    > -- Josh
    >
    >
    
    
    -- 
    Paul H. Hargrove                          PHHargrove_at_lbl_dot_gov
    Future Technologies Group                 Tel: +1-510-495-2352
    HPC Research Department                   Fax: +1-510-486-6900
    Lawrence Berkeley National Laboratory     
    

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