I have all of the IPC-related sysctls listed below. I do see that
kern.ipc.shmmni is set to 192, and that kern.ipc.semmni is set to 10.
Are those the maximums? What does MNI mean in those names? Is there a
man page or recommended document that describes what these mean in
ipcs -M or /usr/src/sys/conf/NOTES
I believe the "mni" portion is "maximum number of identifiers".
ipcs -M shows:
shmmax: 134217728 (max shared memory segment size)
shmmin: 1 (min shared memory segment size)
shmmni: 192 (max number of shared memory identifiers)
shmseg: 128 (max shared memory segments per process)
shmall: 8192 (max amount of shared memory in pages)
So yes, it had definitely reached its max.
So I used ipcrm to remove all of the shared memory segments, and the
problem seems to have cleared up for now. A few rounds of simulating
failed logins to sshit shows that it does allocate shared memory
segments, and every time it adds an IP address it seems to allocate a
new shared memory segment instead of finding the old one.
But from here it looks like an issue to take up with the developer,
since it seems to be a bug. Thanks Bill for your help!
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