HP Tru64 UNIX - 5.1A PK6 Virtual Memory Fixes



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 Advisory Information

LAST UPDATE: 2007-04-17


The Early Release Patch (ERP) kit announced in this Engineering Advisory provides several virtual memory-related fixes reported in HP Tru64 UNIX v 5.1A PK6. Fixes contained in the kit resolve the following problems:

  • Errors in wiring code and light weight wirings
  • Lock management issues within the UBC that can lead to "mcs_unlock: current lock not found" and "mcs_lock: time limit exceeded" panics
  • A kernel memory fault panic when the vm tunable 'anon_rss_enforce' is set to the hard limit (2)
  • A kernel memory fault panic in _OtsMove() called from various I/O or filesystem routines. Two typical stack traces follow.

4 panic
5 trap
6 _XentMM
7 _OtsMove
8 bs_refpg_direct
9 fs_read_direct
10 fs_read
11 msfs_read
12 vn_pread
13 msfs_strategy
14 aio_rw
15 syscall
16 _Xsyscall

0 stop_secondary_cpu
1 panic
2 event_timeout
3 printf
4 panic
5 trap
6 _XentMM
7 _OtsZero
8 cfs_condio_issue_io
9 cfs_blkmap_directio
10 cfs_condio_rw
11 cfs_read
12 vn_read
13 rwuio
14 read
15 syscall
16 _Xsyscall


The following version is affected:

HP Tru64 UNIX v 5.1A PK6

Please note that vm-related fixes for HP Tru64 UNIX v 5.1B-3 have been announced in HP internal Engineering Advisory c00555147, HP Tru64 UNIX - v 5.1B-3 Multiple Virtual Memory Fixes.


HP is releasing the following ERP kit publicly for use by any customer. The ERP kit uses dupatch to install and will not install over any Customer Specific Patches (CSPs) that have file intersections with the ERP. Contact your service provider for assistance if the installation of an ERP is blocked by any of your installed CSPs.

The kit distributes the following files:

  • /sys/BINARY/arch_alphapmap.mod
  • /sys/BINARY/generic.mod
  • /sys/BINARY/vm.mod

Early Release Patch

HP Tru64 UNIX version: 5.1A PK6
ERP Kit Name: T64KIT1001141-V51AB24-E-20070302.tar
Kit Location: