 |
» |
|
|
|
|
|
|
|
|
|
Patch Name: PHKL_25227
Patch Description: s700_800 11.11 VM/JFS deadlock; mmap performance/defect
Creation Date: 01/10/25
Post Date: 01/11/06
Hardware Platforms - OS Releases:
s700: 11.11
s800: 11.11
Products: N/A
Filesets:
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP
Automatic Reboot?: Yes
Status: General Superseded
Critical:
No (superseded patches were critical)
PHKL_24073: HANG
Category Tags:
defect_repair enhancement general_release critical
halts_system
Path Name: /hp-ux_patches/s700_800/11.X/PHKL_25227
Symptoms:
PHKL_25227:
( SR:8606188435 CR:JAGad57643 )
Narrow mode (32bit) HP-UX 11.11 programs cannot mmap64() any
part of a large file beyond the first 2GB.
PHKL_24743:
( SR:8606205558 CR:JAGad74733 ) Duplicate
( SR:8606204858 CR:JAGad74036 )
Decreased performance for mmap() operations has occasionally
been observed in superdome systems with more than 32 cpus.
These symptoms are not specific to superdomes, but could
possibly occur on other high end systems as well.
PHKL_24073:
( SR:8606189205 CR:JAGad58421 )
A multi-threaded process hangs and cannot be killed. This
process will have been repeatedly mmap()ing parts of the
same file, while at the same time reading or writing to it
with the read(), write(), readv(), or writev() system calls
from a different thread. That file must also be on a JFS
file system.
The Netscape Messaging Server's smtpd process is the only
application we've seen do the particular combination of
operations required to get into this state.
Defect Description:
PHKL_25227:
( SR:8606188435 CR:JAGad57643 )
The kernel code was limited by design to allow narrow
mode mmap64() to 2GB or less only.
Resolution:
The kernel was enhanced to remove this limitation. Narrow
mode mmap64() can now map up to 4GB.
PHKL_24743:
( SR:8606205558 CR:JAGad74733 ) Duplicate
( SR:8606204858 CR:JAGad74036 )
Unnecessary acquisition and release of region locks in
common execution paths can cause unpredictable performance
degradation.
Resolution:
ltered code path to minimize frequency of region
lock/release in procedures mmap_file_pieces() and
mmap_file_object(). Note that this is only one of the
causes for unpredictable performance degradation in mmap.
PHKL_24073:
( SR:8606189205 CR:JAGad58421 )
This problem was caused by a lock ordering problem between
VM and JFS. JFS can call VM while holding an inode lock;
the routines called may require a vas lock. VM can call JFS
while holding a vas lock; the routines called may require
an inode lock. If we get unlucky, we hit the same vas/inode
lock combination from both directions, and the threads
deadlock. Because the vas lock potentially held by VM is
a per process resource, this situation can only be
encountered by a multithreaded process.
Resolution:
The fix is to have the VM routine drop the vas lock before
calling the file system code; fortunately, the VM routine
can safely drop and reacquire the lock around the call ...
it was mostly holding it to avoid dropping and reacquiring
it repeatedly in a loop.
SR:
8606188435 8606189205 8606204858 8606205558
Patch Files:
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
/usr/conf/lib/libvm.a(vm_mmap.o)
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
/usr/conf/lib/libvm.a(vm_mmap.o)
what(1) Output:
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
/usr/conf/lib/libvm.a(vm_mmap.o):
vm_mmap.c $Date: 2001/10/02 21:46:59 $Revision: r11.
11/3 PATCH_11.11 (PHKL_25227)
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
/usr/conf/lib/libvm.a(vm_mmap.o):
vm_mmap.c $Date: 2001/10/02 21:46:59 $Revision: r11.
11/3 PATCH_11.11 (PHKL_25227)
cksum(1) Output:
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
1864600869 32244 /usr/conf/lib/libvm.a(vm_mmap.o)
OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
2270054565 70056 /usr/conf/lib/libvm.a(vm_mmap.o)
Patch Conflicts: None
Patch Dependencies: None
Hardware Dependencies: None
Other Dependencies: None
Supersedes:
PHKL_24743 PHKL_24073
Equivalent Patches:
PHKL_24826:
s700: 11.00
s800: 11.00
Patch Package Size: 130 KBytes
Installation Instructions:
Please review all instructions and the Hewlett-Packard
SupportLine User Guide or your Hewlett-Packard support terms
and conditions for precautions, scope of license,
restrictions, and, limitation of liability and warranties,
before installing this patch.
------------------------------------------------------------
1. Back up your system before installing a patch.
2. Login as root.
3. Copy the patch to the /tmp directory.
4. Move to the /tmp directory and unshar the patch:
cd /tmp
sh PHKL_25227
5. Run swinstall to install the patch:
swinstall -x autoreboot=true -x patch_match_target=true \
-s /tmp/PHKL_25227.depot
By default swinstall will archive the original software in
/var/adm/sw/save/PHKL_25227. If you do not wish to retain a
copy of the original software, include the patch_save_files
option in the swinstall command above:
-x patch_save_files=false
WARNING: If patch_save_files is false when a patch is installed,
the patch cannot be deinstalled. Please be careful
when using this feature.
For future reference, the contents of the PHKL_25227.text file is
available in the product readme:
swlist -l product -a readme -d @ /tmp/PHKL_25227.depot
To put this patch on a magnetic tape and install from the
tape drive, use the command:
dd if=/tmp/PHKL_25227.depot of=/dev/rmt/0m bs=2k
Special Installation Instructions: None
|
Printable version
