https://bz.apache.org/bugzilla/show_bug.cgi?id=62838
Bug ID: 62838
Summary: semaphores appear to be leaking
Product: Apache httpd-2
Version: 2.4.34
Hardware: PC
Status: NEW
Severity: major
Priority: P2
Component: Core
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
As we have progressively increased the number of sites using Apache 2.4
instead of Apache 2.2, we are seeing more and more cases of semaphore leakage.
The symptom is simply that after a period of time of the order of a few days,
we hit the kernel configured semaphore limit.
(chroot) user@host:~ $ ipcs -ls
------ Semaphore Limits --------
max number of arrays = 8192
max semaphores per array = 250
max semaphores system wide = 262144
max ops per semop call = 32
semaphore max value = 32767
(chroot) user@host:~ $ ipcs -us
------ Semaphore Status --------
used arrays = 8192
allocated semaphores = 8204
(chroot) user@host:~ $
All Apache instances are completely stopped once a day and restarted, so we
would not expect a net increase of any kind over time.
I believe the likely culprits are either the healthcheck module or the proxy
balancer module, both of which we make extensive use of.
What options do I have for tracking this down?
Here's the loaded module dump.
Loaded Modules:
core_module (static)
authn_file_module (static)
authz_host_module (static)
authz_groupfile_module (static)
authz_user_module (static)
authnz_ldap_module (static)
auth_basic_module (static)
auth_digest_module (static)
so_module (static)
http_module (static)
mime_module (static)
ldap_module (static)
log_config_module (static)
env_module (static)
ssl_module (static)
http2_module (static)
actions_module (static)
alias_module (static)
rewrite_module (static)
mpm_event_module (shared)
negotiation_module (shared)
status_module (shared)
info_module (shared)
include_module (shared)
autoindex_module (shared)
dir_module (shared)
cgi_module (shared)
expires_module (shared)
headers_module (shared)
unique_id_module (shared)
setenvif_module (shared)
logio_module (shared)
unixd_module (shared)
fcgid_module (shared)
proxy_module (shared)
proxy_http_module (shared)
proxy_http2_module (shared)
reqtimeout_module (shared)
proxy_ajp_module (shared)
slotmem_shm_module (shared)
proxy_balancer_module (shared)
proxy_wstunnel_module (shared)
proxy_hcheck_module (shared)
watchdog_module (shared)
lbmethod_byrequests_module (shared)
lbmethod_bytraffic_module (shared)
lbmethod_bybusyness_module (shared)
lbmethod_heartbeat_module (shared)
auth_kerb_module (shared)
suexec_module (shared)
gateform_module (shared)
qos_module (shared)
jk_module (shared)
weblogic_module (shared)
socache_shmcb_module (shared)
ct_auth_module (shared)
authz_dbm_module (shared)
security2_module (shared)
deflate_module (shared)
filter_module (shared)
substitute_module (shared)
authn_core_module (shared)
authz_core_module (shared)
remoteip_module (shared)
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