IV58244: LOOPMOUNT CAN CRASH THE SYSTEM APPLIES TO AIX 6100-07

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• loopmount can crash the system. The stack trace:
  CRASH INFORMATION:
  CPU 0 CSA F00000002FF47600 at time of crash,
    error code for LEDs: 70000000
  pvthread+02C800 STACK:
  [00022080]abend_trap+000000 ()
  [005982AC]slock+00054C (??, ??)
  [00009558].simple_lock+000058 ()
  [06B81F94]loopdd:loop_read+000054
    (??, ??, ??, ??)
  [005BB7E4]rdevread+0001C4 (??, ??, ??, ??, ??)
  [007AE27C]gno_rw@AF17_5+00005C
    (??, ??, ??, ??, ??)
  [005ADAC8]rwuio+000108 (??, ??, ??, ??, ??, ??)
  [005AE520]fp_rdwr+000180
    (??, ??, ??, ??, ??, ??, ??, ??)
  [005AEED4]fp_read+000034
    (??, ??, ??, ??, ??, ??)
  [00014F50].kernel_add_gate_cstack+000030 ()
  [F1000000C045E524]cfs.ext:cdrbread+0000A4
    (??, ??, ??, ??)
  [F1000000C0462F38]cfs.ext:cdrgetname+000298
    (??, ??, ??, ??, ??, ??)
  [F1000000C0463E10]cfs.ext:cdrlookup_rrg+000290
    (??, ??, ??)
  [F1000000C04613A0]cfs.ext:cdr_lookup+0000E0
    (??, ??, ??, ??, ??, ??)
  [00014D70].hkey_legacy_gate+00004C ()
  [005EA6D4]vnop_lookup+0001D4
    (??, ??, ??, ??, ??, ??)
  [005ABDD8]lookuppn+000918
    (??, ??, ??, ??, ??, ??, ??, ??)
  [006841F8]openpnp+000238
    (??, ??, ??, ??, ??, ??, ??, ??)
  [00684C40]openpath+000140
    (??, ??, ??, ??, ??, ??, ??, ??)
  [0068585C]fp_open+00009C
    (??, ??, ??, ??, ??, ??)
  [00014F50].kernel_add_gate_cstack+000030 ()
  [06B82C60]loopdd:loop_open+000200
    (??, ??, ??, ??)
  [005BAF00]devcopen+000480 (??, ??, ??, ??, ??)
  [005BBE0C]fp_opendev+0001EC (??, ??, ??, ??, ??)
  [00014F50].kernel_add_gate_cstack+000030 ()
  [F1000000C045D740]cfs.ext:cdr_mount+0001C0
    (??, ??)
  [00014D70].hkey_legacy_gate+00004C ()
  [005F0268]vfs_mount+000028 (??, ??)
  [005E10D0]smount+0004F0 (??)
  [005E1D34]vmount+0001F4 (??, ??)
  [000038A4]mfspurr_sc_flih01+0000E4 ()
  [kdb_get_virtual_memory] no real storage @ 2FF201A8
  [10007B24]10007B24 ()
  [kdb_read_mem] no real storage @ FFFFFFFFFFF5FA0
  Abend reason is : ESYSERROR_SL_RECURLOCK
  
  this happens if there is already a loopmounted
  iso image and another loopmount does search for
  the image file in this already loopmounted directory.
  Example: /tmp/iso1 is the already mounted image
  cd /tmp/iso1
  loopmount -i i2.iso "-V cdrfs -o ro" -m /tmp/iso2
  The current work directory is /tmp/iso1 and here
  we try to find i2.iso.
  

Local fix

• make sure the loopmount will not search for
  the image to mount in an already loopmounted
  directory.
  

Problem summary

• loopmount can crash the system. this happens if there is
  already a loopmounted iso image and another loopmount does
  search for the image file in this already loopmounted
  directory.
  

Problem conclusion

• Logic added to avoid the system crash.
  

Temporary fix

Comments

• 6100-07 - use AIX APAR IV58244
  6100-08 - use AIX APAR IV57935
  6100-09 - use AIX APAR IV51885
  6100-09 - use AIX APAR IV51885
  6100-09 - use AIX APAR IV51885
  7100-01 - use AIX APAR IV57552
  7100-02 - use AIX APAR IV47155
  7100-02 - use AIX APAR IV47155
  7100-03 - use AIX APAR IV51480
  

APAR Information

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

  IV47155

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

Fix information

• Fixed component name

  AIX 610 STD EDI

• Fixed component ID

  5765G6200

Applicable component levels

• R610 PSY U865562

     UP14/08/11 I 1000

PTF to Fileset Mapping

• U865562 devices.loopback.rte 6.1.7.17