postgres startup blues: pre-existing shared memory block (key 5432001, ID 0) is still in use

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Dear Folks,

F8
all updates applied.
P4 AGP.
$ uname -r
2.6.24.4-64.fc8

after booting this new kernel, I haven't been able to start
PostgreSQL; I get this appearing in /var/lib/pgsql/pgstartup.log:
FATAL:  pre-existing shared memory block (key 5432001, ID 0) is still in use
HINT:  If you're sure there are no old server processes still running,
remove the shared memory block with the command "ipcclean", "ipcrm",
or just delete the file "postmaster.pid".  A reboot didn't help.

However, ipcs doesn't seem to indicate that it is used:
$ ipcs

------ Shared Memory Segments --------
key shmid owner perms bytes nattch status 0x00000000 0 root 644 40 2 0x00000000 32769 root 644 16384 2 0x00000000 65538 root 644 268 2 0xb7390001 98307 root 666 77716 2 0x00000000 131076 root 777 139264 1 0x00000000 229381 nicku 600 393216 2 dest 0x00000000 262150 nicku 600 393216 2 dest 0x00000000 294919 nicku 600 393216 2 dest 0x00000000 327688 nicku 600 393216 2 dest 0x00000000 360457 nicku 600 393216 2 dest 0x00000000 393226 nicku 600 393216 2 dest 0x00000000 425995 nicku 600 393216 2 dest 0x00000000 458764 nicku 600 393216 2 dest
------ Semaphore Arrays --------
key semid owner perms nsems
------ Message Queues --------
key msqid owner perms used-bytes messages
Any ideas or suggestions to understand this problem better, please?
--
Nick Urbanik   RHCE         http://nicku.org        [email protected]
GPG: 7FFA CDC7 5A77 0558 DC7A 790A 16DF EC5B BB9D 2C24 ID: BB9D2C24
I disclaim, therefore I am.
"What you have told us is rubbish. The world is really a flat plate
supported on the back of a giant disclaimer."
"What is the disclaimer standing on?"
"But it's disclaimers all the way down!"    (sorry Stephen Hawking.)

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