Hello, A few months ago I discovered a problem with libevent and arm architecture. I have TI DM355 board with montavista distribution, kernel Linux testarm 2.6.10_mvl401 #8 Wed Mar 18 15:04:34 MSK 2009 armv5tejl unknown
My embedded libevent-based http server unexpectedly crashed. Then I
set variable EVENT_NOEPOLL=1 and everything went well.
The problem appears in the all libevent versions including the latest
1.4.9. Today I tried to discover the problem with gdb and made this
patch (attached):
Index: epoll.c
===================================================================
--- epoll.c (revision 5589)
+++ epoll.c (revision 5590)
@@ -141,7 +141,7 @@
epollop->epfd = epfd;
/* Initalize fields */
- epollop->events = malloc(nfiles * sizeof(struct epoll_event));
+ epollop->events = calloc(nfiles, sizeof(struct epoll_event));
if (epollop->events == NULL) {
free(epollop);
return (NULL);
@@ -226,6 +226,7 @@
struct event *evread = NULL, *evwrite = NULL;
evep = (struct evepoll *)events[i].data.ptr;
+ if (!evep) continue;
if (what & (EPOLLHUP|EPOLLERR)) {
evread = evep->evread;
It works OK now, but I'm not sure I made a correct patch. And I don't
understand why it doesn't segfaulted on x86_64 or x86 architecture.
libevent.patch
Description: Binary data
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