> Even reducing the thread stack size didn't help.
> I observe that the thread creation as such is not
> a problem. I create about 1000 threads , delay in
> each thread the SSL_connect for about 10 sec.
> Once the delay expires and each client make connections
> to the server the seg fault occurs.
You know, looking back at your original trace, it seems I may have jumped to
conclusions. It's hard to be sure because I don't know what OpenSSL version
you are using, so the line numbers don't tell me anything, but check this
out:
> #0 SHA1_Init (c=0x0) at sha_locl.h:150
> #1 0x405b2bb0 in init (ctx=0x0) at m_sha1.c:72
> #2 0x405afc91 in EVP_DigestInit_ex (ctx=0x4d606230,
> type=0x4061f620, impl=0x0) at digest.c:207
> #3 0x405ac08e in ssleay_rand_add (buf=0x0, num=0,
> add= 2.5863007356866632e-306) at md_rand.c:263
> #4 0x405ace6e in RAND_add (buf=0x8a269f8,
> num=144861688, entropy=0) at rand_lib.c:151
I'm guessing frame #2 is this:
return ctx->digest->init(ctx);
Which calls this:
static int init(EVP_MD_CTX *ctx)
{ return SHA1_Init(ctx->md_data); }
Notice that 'init' was called with a NULL context. But the context
cannot
have been NULL in frame 2 because if it was ctx->digest would have faulted.
So it looks like the stack in frame #2 cannot have lead to the stack in
frame #1.
This is not a memory exhaustion issue or a failure to check for NULL. It
looks like stack corruption. The real puzzle is why stack corruption would
only occur with a large number of threads.
I'm thinking perhaps there's some concurrency issue with
ssleay_rand_add,
but I've been over it twice and I don't see any issue. The md context would
be unique for each thread, so it should be safe.
Maybe someone will read this and it will resonate with something they
know?
If you can, please tell us what version of OpenSSL this was. This will allow
people to understand the line numbers better and make sure they're not
looking at code that has whatever bit you already fixed.
DS
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