bugzilla at apache
Oct 31, 2009, 11:42 PM
Post #1 of 1
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[Bug 48094] New: Avoid a race condition by suspending worker threads before closing worker sockets
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https://issues.apache.org/bugzilla/show_bug.cgi?id=48094
Summary: Avoid a race condition by suspending worker threads
before closing worker sockets
Product: Apache httpd-2
Version: 2.3-HEAD
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: worker
AssignedTo: bugs [at] httpd
ReportedBy: bojan [at] rexursive
Created an attachment (id=24449)
--> (https://issues.apache.org/bugzilla/attachment.cgi?id=24449)
(Hopefully) safe close_worker_sockets()
Current code closes worker sockets in close_worker_sockets() from the listener
thread without suspending the workers. At the same time, worker threads may be
in the process of doing the same (they may even set worker_sockets[i] to NULL,
causing a segfault in the listener), potentially causing problems.
The attached patch suspends worker threads first and then shuts down sockets,
using shutdown(). This way, worker threads can still proceed later with regular
close, without any side effects.
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