minor kill and mmap problem

Sheldon E. Newhouse (sen1@math.msu.edu)
Fri, 27 Sep 1996 09:05:50 -0400

I reported earlier that
kill -1 pid of nfsd
run two times on one of my systems (named pokie) killed the nfsd
On another system (named elsie) it did not.

The first system (pokie) is P5-133, 96 MB RAM, AHA2940.
The second system (elsie) is P5-100, 48 MB RAM, ide.

I did an strace of
kill -1 pid of nfsd on each and here is a diff on those.

Also, after starting nfs, I did an strace of kill -1 pid of nfsd on
pokie twice and got no difference,

sen1@pokie tmp]$ diff strace.log.pokie strace.log.elsie
2c2
< stat("/etc/ld.so.cache", {st_mode=S_IFREG|0644, st_size=6531, ...}) =
0

---
> stat("/etc/ld.so.cache", {st_mode=S_IFREG|0644, st_size=3463, ...}) =
0
4c4
< mmap(0, 6531, PROT_READ, MAP_SHARED, 3, 0) = 0x40007000

---
> mmap(0, 3463, PROT_READ, MAP_SHARED, 3, 0) = 0x40007000
8,11c8,11
< mmap(0, 811008, PROT_NONE, MAP_PRIVATE|0x20, 4294967295, 0) =
0x40009000
< mmap(0x40009000, 582809, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x40009000
< mmap(0x40098000, 21452, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED,
3, 0x8e000) = 0x40098000
< mmap(0x4009e000, 199588, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|0x20, 4294967295, 0) = 0x4009e000

---
> mmap(0, 811008, PROT_NONE, MAP_PRIVATE|0x20, 4294967295, 0) =
0x40008000
> mmap(0x40008000, 582809, PROT_READ|PROT_WRITE|PROT_EXEC,
MAP_PRIVATE|MAP_FIXED, 3, 0) = 0x40008000
> mmap(0x40097000, 21452, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED,
3, 0x8e000) = 0x40097000
> mmap(0x4009d000, 199588, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED|0x20, 4294967295, 0) = 0x4009d000
13c13
< munmap(0x40007000, 6531)                = 0

---
> munmap(0x40007000, 3463)                = 0
15c15
< kill(346, SIGHUP)                       = 0

---
> kill(114, SIGHUP)                       = 0




 This is not a big problem for me since I have only a few users on these
systems and can easily start and stop nfsd.  On big systems with many
users, it may cause problems when the /etc/exports file needs to be read
again.


-sen


 ---------------------------------------------------------------------------
 | Sheldon E. Newhouse            |    e-mail: sen1@math.msu.edu           |
 | Mathematics Department         |       				   |
 | Michigan State University      | telephone: 517-355-9684                |
 | E. Lansing, MI 48824-1027 USA  |       FAX: 517-432-1562                |
 ---------------------------------------------------------------------------