<html> <head> <style></style> </head> <body class='hmmessage'> Hello all, this is my first post to this list. I am writing a threaded cairo application and I need help understanding a rare-ish bug. I'm still using cairo 1.8.8 but considering an upgrade to get the nice profiling tools. Every so often I get the following crash: cairo-board: cairo-surface.c:406: cairo_surface_reference: Assertion `((*&(&surface->ref_count)->ref_count) > 0)' failed. Obtained 45 stack frames. /lib/libc.so.6 [0x7f2e23ae1290] /lib/libc.so.6(gsignal+0x35) [0x7f2e23ae1205] /lib/libc.so.6(abort+0x183) [0x7f2e23ae2723] /lib/libc.so.6(__assert_fail+0xe9) [0x7f2e23ada229] /usr/lib/libcairo.so.2 [0x7f2e2496cbb0] /usr/lib/libcairo.so.2 [0x7f2e249654dd] /usr/lib/libcairo.so.2(cairo_pattern_create_for_surface+0x7d) [0x7f2e24966a6d] /usr/lib/libcairo.so.2(cairo_set_source_surface+0x46) [0x7f2e249525b6] ./cairo-board [0x40f591] If understand correctly my application is calling set_source_surface on an invalid surface? Does it mean the surface was destroyed? This is very possible as the code is quite convoluted. The rarity of the crash (less than 1/100) makes me think it might be a timing issue with a thread destroying the surface while another one tries to read it with cairo_set_source_surface but I can't see where as everything should be locked... I'd like to know if an expert can confirm. Thanks very much Julien <hr />Keep your friends updated— <a href='http://www.microsoft.com/middleeast/windows/windowslive/see-it-in-action/social-network-basics.aspx?ocid=PID23461::T:WLMTAGL:ON:WL:en-xm:SI_SB_5:092010' target='_new'>even when you’re not signed in.</a></body> </html>