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PM55142: RedHat Enterprise 6 kernel panics when executing an ls or find from within a view-extended path and not within a VOB

Fixes are available

Rational ClearCase Fix Pack 03 (8.0.0.3) for 8.0
Rational ClearCase Fix Pack 11 (8.0.0.11) for 8.0
Rational ClearCase Fix Pack 12 (8.0.0.12) for 8.0
Rational ClearCase Fix Pack 13 (8.0.0.13) for 8.0
Rational ClearCase Fix Pack 14 (8.0.0.14) for 8.0
Rational ClearCase Fix Pack 15 (8.0.0.15) for 8.0
Rational ClearCase Fix Pack 16 (8.0.0.16) for 8.0
Rational ClearCase Fix Pack 17 (8.0.0.17) for 8.0
Rational ClearCase Fix Pack 18 (8.0.0.18) for 8.0
Rational ClearCase Fix Pack 19 (8.0.0.19) for 8.0
Rational ClearCase Fix Pack 20 (8.0.0.20) for 8.0
Rational ClearCase Fix Pack 21 (8.0.0.21) for 8.0

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APAR status

  • Closed as unreproducible.

Error description

  • RedHat Enterprise 6 kernel panics when executing an ls or find
from within a view-extended path and not within a VOB


ClearCase 7.1.2.4

RedHat Enterprise 6 and 6 SP1



To Reproduce:


1)  Start a view:  cleartool startview ?tag?

2)  cd into /view/?tag?/var/empty

3)  Issue either a Linux ?find? or Linux ?ls? command:  The
following panic will occur:

crash? bt
PID: 12930  TASK: ffff8806ff2840c0  CPU: 0   COMMAND: 'find'
 #0 [ffff8806ba46b770] machine_kexec at ffffffff810310db
 #1 [ffff8806ba46b7d0] crash_kexec at ffffffff810b6332
 #2 [ffff8806ba46b8a0] oops_end at ffffffff814de840
 #3 [ffff8806ba46b8d0] no_context at ffffffff81040ccb
 #4 [ffff8806ba46b920] __bad_area_nosemaphore at
ffffffff81040f55
 #5 [ffff8806ba46b970] bad_area_nosemaphore at ffffffff81041023
 #6 [ffff8806ba46b980] __do_page_fault at ffffffff810416dd
 #7 [ffff8806ba46baa0] do_page_fault at ffffffff814e084e
 #8 [ffff8806ba46bad0] page_fault at ffffffff814ddbd5
    [exception RIP: kern_addr_valid+194]
    RIP: ffffffff8103f802  RSP: ffff8806ba46bb88  RFLAGS:
00010206
    RAX: 0000088904408000  RBX: ffff880d9f8b0100  RCX:
00003ffffffff000
    RDX: 0000088904408fc0  RSI: ffff880000000000  RDI:
8b08488904408b04
    RBP: ffff8806ba46bb88   R8: ffff8806fd77e940   R9:
0000000000000000
    R10: 0000000000000100  R11: ffff8806ba46bc48  R12:
ffff880a497f8b00
    R13: 00000000000000c0  R14: ffff880141defa78  R15:
ffff8807005ac140
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #9 [ffff8806ba46bb90] kmem_ptr_validate at ffffffff81159b4e
#10 [ffff8806ba46bbc0] d_validate at ffffffff8118a83e
#11 [ffff8806ba46bbf0] vnode_dop_revalidate at ffffffffa04f593d
[mvfs]
#12 [ffff8806ba46bc90] do_lookup at ffffffff8118064a
#13 [ffff8806ba46bcf0] __link_path_walk at ffffffff81180d79
#14 [ffff8806ba46bd70] path_walk at ffffffff811816fa
#15 [ffff8806ba46bdb0] do_path_lookup at ffffffff811818cb
#16 [ffff8806ba46bde0] user_path_at at ffffffff81181a57
#17 [ffff8806ba46beb0] vfs_fstatat at ffffffff81177d5c
#18 [ffff8806ba46bef0] sys_newfstatat at ffffffff81177dc4
#19 [ffff8806ba46bf80] system_call_fastpath at ffffffff8100b172
    RIP: 000000320d6d7faa  RSP: 00007fffd4bd5998  RFLAGS:
00000202
    RAX: 0000000000000106  RBX: ffffffff8100b172  RCX:
0000000000f1dabf
    RDX: 0000000000f1d118  RSI: 0000000000f1d1a8  RDI:
ffffffffffffff9c
    RBP: 0000000000f1d118   R8: 0000000000000100   R9:
0000000000800000
    R10: 0000000000000100  R11: 0000000000000246  R12:
0000000000f18c90
    R13: 0000000000f1d0b0  R14: 0000000000000001  R15:
0000000000f18c90
    ORIG_RAX: 0000000000000106  CS: 0033  SS: 002b

The same backtrace is seen with the Linux ?ls? command as well.


Workaround:  Do not access non-VOB related mounts when cd?ing
into a view-extended path.  On Linux, the view-extended path
will not cover objects that do not reside within MVFS and thus
would require a setview shell to accommodate those types of file
level access.  This restriction is due to a kernel level
limitations on third party filesystems.

Local fix

  • 



Problem summary


    

  • ****************************************************************
* USERS AFFECTED:                                              *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
This problem is no longer reproducible by the customer once
the kernel has been rebuilt.

    



Problem conclusion


    

  • 



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    PM55142
    • 

  • Reported component name
    CC&CC MSITE WIN
    • 

  • Reported component ID
    5724G3300
    • 

  • Reported release
    712
    • 

  • Status
    CLOSED  UR5
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt
    • 

  • Submitted date
    2011-12-29
    • 

  • Closed date
    2012-06-05
    • 

  • Last modified date
    2012-06-05
    • 





    

  • APAR is sysrouted FROM one or more of the following:
    

    • 

  • APAR is sysrouted TO one or more of the following:
    

    • 



Fix information


    



Applicable component levels


    

  • R712  PSN
       UP
    • 








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            05 June 2012
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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