[naviserver-devel] patch for ns_sockcallback

[Wolfgang W. <wol...@di...>]

Hello!

We are using websockets on naviserver. After connections are 
established, we create a callback for the read event with 
ns_sockcallback and push them in the background with ns_chan. We hit a 
limit of exactly 100 connections, which went away, when we commented out 
the ns_sockcallback call.

The problem is an invalid memory allocation. I've attached a patch, 
which allows us to open much more connections, although we still get a 
memory corruption at around 1000 connections, somtimes more, sometimes 
less. TCL is compiled with Gustaf Neumanns memory allocator path. This 
is the backtrace with the linux standard memory allocator

  *** glibc detected *** /usr/local/naviserver/bin/nsd: malloc(): memory 
corruption: 0x000000000b371b60 ***
======= Backtrace: =========
/lib/libc.so.6(+0x71e16)[0x7f9de5cf5e16]
/lib/libc.so.6(+0x74ead)[0x7f9de5cf8ead]
/lib/libc.so.6(__libc_malloc+0x70)[0x7f9de5cfac70]
/usr/local/lib/libtcl8.5.so(Tcl_Alloc+0x15)[0x7f9de64b8475]
/usr/local/lib/libtcl8.5.so(+0xafdf2)[0x7f9de652ddf2]
/usr/local/lib/libtcl8.5.so(+0x330de)[0x7f9de64b10de]
/usr/local/lib/libtcl8.5.so(Tcl_EvalEx+0x16)[0x7f9de64b1aa6]
/usr/local/naviserver/lib/libnsd.so(Ns_TclEvalCallback+0x12b)[0x7f9de6e4682b]
/usr/local/naviserver/lib/libnsd.so(NsTclTraceProc+0x1c)[0x7f9de6e4a60c]
/usr/local/naviserver/lib/libnsd.so(+0x5984a)[0x7f9de6e4a84a]
/usr/local/naviserver/lib/libnsd.so(+0x59c45)[0x7f9de6e4ac45]
/usr/local/naviserver/lib/libnsd.so(Ns_TclAllocateInterp+0x15)[0x7f9de6e4aef5]
/usr/local/naviserver/lib/libnsd.so(NsTclSockProc+0x42)[0x7f9de6e56eb2]
/usr/local/naviserver/lib/libnsd.so(+0x5250f)[0x7f9de6e4350f]
/usr/local/naviserver/lib/libnsthread.so(NsThreadMain+0x7e)[0x7f9de67a067e]
/usr/local/naviserver/lib/libnsthread.so(+0x5029)[0x7f9de67a1029]
/lib/libpthread.so.0(+0x68ca)[0x7f9de586a8ca]
/lib/libc.so.6(clone+0x6d)[0x7f9de5d53b6d]

We are running some test with the google allocator, but the results are 
similar.

Wolfgang

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*Wolfgang Winkler*
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wol...@di...
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