Bug 214810

I've hit this twice testing WebRTC in my Ephy jhbuild on https://meet.gnome.org (virtual GUADEC) after fixing bug #214806, but haven't figured out how to reproduce (hence no debug log). One time I think it happened when I tried to enable my video stream but then immediately afterwards cancelled it, but I failed to reproduce. It's deep in GStreamer, in fact there's no WebKit anywhere in the backtrace, so who knows if it's our bug. I'm not sure reporting directly upstream would be useful. I didn't even realize we used GStreamer for WebRTC. (gdb) bt full #0 __memmove_avx_unaligned_erms () at ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:383 #1 0x00007f679f7c27fe in memcpy (__len=172800, __src=<optimized out>, __dest=<optimized out>) at /usr/include/bits/string_fortified.h:34 i = 0 tocopy = 172800 sinfo = {memory = 0x43925c0 [GstMemory], flags = GST_MAP_READ, data = 0x7f6712633040 <error: Cannot access memory at address 0x7f6712633040>, size = 172800, maxsize = 172800, user_data = {0x45cf3e8, 0x1010, 0x7f679f7fedc0 <gst_pad_push_data+1680>, 0x0}, _gst_reserved = {0x0, 0x43eb4a8, 0x3b999b0, 0x3b999b0}} left = <optimized out> dinfo = {memory = 0x7f6700187000 [GstMemory], flags = GST_MAP_WRITE, data = 0x7f6700187078 "tion\"&&define.amd){define([],f)}else{var g;if(typeof window!==\"undefined\"){g=window}else if(typeof global!==\"undefined\"){g=global}else if(typeof self!==\"undefined\"){g=self}else{g=this}g.kurentoUtils ="..., size = 259200, maxsize = 259200, user_data = {0x7de8d6869bcc9d00, 0x7f66e27a5910, 0x45cf3d0, 0x3b97910}, _gst_reserved = {0x3ea25a0, 0xffffffffffffffff, 0x0, 0x7f679f8c7f28 <_priv_tracer_enabled>}} ptr = <optimized out> parent = <optimized out> size = <optimized out> poffset = <optimized out> mem = 0x4c98860 result = 0x7f6700187000 [GstMemory] __PRETTY_FUNCTION__ = "_get_merged_memory" #2 _get_merged_memory (buffer=0x4c987e0 [GstBuffer], idx=0, length=3) at gstbuffer.c:292 i = 0 tocopy = 172800 sinfo = {memory = 0x43925c0 [GstMemory], flags = GST_MAP_READ, data = 0x7f6712633040 <error: Cannot access memory at address 0x7f6712633040>, size = 172800, maxsize = 172800, user_data = {0x45cf3e8, 0x1010, 0x7f679f7fedc0 <gst_pad_push_data+1680>, 0x0}, _gst_reserved = {0x0, 0x43eb4a8, 0x3b999b0, 0x3b999b0}} left = <optimized out> dinfo = {memory = 0x7f6700187000 [GstMemory], flags = GST_MAP_WRITE, data = 0x7f6700187078 "tion\"&&define.amd){define([],f)}else{var g;if(typeof window!==\"undefined\"){g=window}else if(typeof global!==\"undefined\"){g=global}else if(typeof self!==\"undefined\"){g=self}else{g=this}g.kurentoUtils ="..., size = 259200, maxsize = 259200, user_data = {0x7de8d6869bcc9d00, 0x7f66e27a5910, 0x45cf3d0, 0x3b97910}, _gst_reserved = {0x3ea25a0, 0xffffffffffffffff, 0x0, 0x7f679f8c7f28 <_priv_tracer_enabled>}} ptr = <optimized out> parent = <optimized out> size = <optimized out> poffset = <optimized out> mem = 0x4c98860 result = 0x7f6700187000 [GstMemory] __PRETTY_FUNCTION__ = "_get_merged_memory" #3 0x00007f679f7c4188 in gst_buffer_map_range (buffer=buffer@entry=0x4c987e0 [GstBuffer], idx=idx@entry=0, length=3, length@entry=-1, info=info@entry=0x4697880, flags=flags@entry=GST_MAP_READ) at gstbuffer.c:1810 mem = <optimized out> nmem = <optimized out> write = 0 writable = 1 len = 3 --Type <RET> for more, q to quit, c to continue without paging--c __func__ = "gst_buffer_map_range" __PRETTY_FUNCTION__ = "gst_buffer_map_range" #4 0x00007f679f7c43a6 in gst_buffer_map (buffer=buffer@entry=0x4c987e0 [GstBuffer], info=info@entry=0x4697880, flags=flags@entry=GST_MAP_READ) at gstbuffer.c:1754 #5 0x00007f679f60d1a3 in gst_video_frame_map_id (frame=frame@entry=0x46977a8, info=0x18958a0, buffer=buffer@entry=0x4c987e0 [GstBuffer], id=id@entry=-1, flags=flags@entry=GST_MAP_READ) at video-frame.c:117 meta = 0x0 i = <optimized out> __func__ = "gst_video_frame_map_id" __PRETTY_FUNCTION__ = "gst_video_frame_map_id" #6 0x00007f679f60d661 in gst_video_frame_map (frame=frame@entry=0x46977a8, info=<optimized out>, buffer=buffer@entry=0x4c987e0 [GstBuffer], flags=flags@entry=GST_MAP_READ) at video-frame.c:246 #7 0x00007f679f59389d in _raw_upload_frame_new (buffer=0x4c987e0 [GstBuffer], raw=0x45a5db0) at gstglupload.c:1161 frame = 0x46977a0 info = <optimized out> i = <optimized out> raw = 0x45a5db0 features = <optimized out> #8 _raw_data_upload_accept (in_caps=<optimized out>, out_caps=<optimized out>, buffer=0x4c987e0 [GstBuffer], impl=0x45a5db0) at gstglupload.c:1260 raw = 0x45a5db0 features = <optimized out> #9 _raw_data_upload_accept (impl=0x45a5db0, buffer=0x4c987e0 [GstBuffer], in_caps=<optimized out>, out_caps=<optimized out>) at gstglupload.c:1248 raw = 0x45a5db0 features = <optimized out> #10 0x00007f679f5940f4 in gst_gl_upload_perform_with_buffer (upload=0x1895a10 [GstGLUpload|glupload4], buffer=buffer@entry=0x4c987e0 [GstBuffer], outbuf_ptr=outbuf_ptr@entry=0x7f66e27a5ae0) at gstglupload.c:1987 ret = <optimized out> outbuf = 0x3b99640 [None] last_impl = 0x45a5db0 __func__ = "gst_gl_upload_perform_with_buffer" #11 0x00007f6717b9ec23 in gst_gl_upload_element_prepare_output_buffer (bt=0x3b99640 [GstGLUploadElement|gluploadelement4], buffer=0x4c987e0 [GstBuffer], outbuf=0x7f66e27a5ae0) at gstgluploadelement.c:242 upload = 0x3b99640 [GstGLUploadElement|gluploadelement4] ret = <optimized out> bclass = 0x3b904b0 __PRETTY_FUNCTION__ = "gst_gl_upload_element_prepare_output_buffer" #12 0x00007f679f90fb58 in default_generate_output (trans=0x3b99640 [GstGLUploadElement|gluploadelement4], outbuf=0x7f66e27a5ae0) at gstbasetransform.c:2112 bclass = 0x3b904b0 priv = 0x3b99570 ret = GST_FLOW_OK inbuf = 0x4c987e0 [GstBuffer] want_in_place = <optimized out> __PRETTY_FUNCTION__ = "default_generate_output" #13 0x00007f679f90f4a4 in gst_base_transform_chain (pad=<optimized out>, parent=0x3b99640 [GstGLUploadElement|gluploadelement4], buffer=<optimized out>) at gstbasetransform.c:2294 trans = 0x3b99640 [GstGLUploadElement|gluploadelement4] klass = 0x3b904b0 priv = 0x3b99570 ret = <optimized out> position = 18446744073709551615 [99:99:99.999999999] timestamp = <optimized out> duration = <optimized out> outbuf = 0x0 __PRETTY_FUNCTION__ = "gst_base_transform_chain" #14 0x00007f679f7fcb3d in gst_pad_chain_data_unchecked (pad=pad@entry=0x45cece0 [GstPad|sink], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4327 chainfunc = 0x7f679f90f400 <gst_base_transform_chain> ret = <optimized out> parent = 0x3b99640 [GstGLUploadElement|gluploadelement4] handled = 0 __PRETTY_FUNCTION__ = "gst_pad_chain_data_unchecked" #15 0x00007f679f7feca9 in gst_pad_push_data (pad=pad@entry=0x45ca830 [GstProxyPad|proxypad128], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4583 peer = 0x45cece0 [GstPad|sink] ret = GST_FLOW_OK handled = 0 __PRETTY_FUNCTION__ = "gst_pad_push_data" #16 0x00007f679f805f12 in gst_pad_push (pad=pad@entry=0x45ca830 [GstProxyPad|proxypad128], buffer=buffer@entry=0x4c987e0 [GstBuffer]) at gstpad.c:4702 res = <optimized out> __func__ = "gst_pad_push" #17 0x00007f679f7eb883 in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x4c987e0 [GstBuffer]) at gstghostpad.c:127 res = <optimized out> internal = 0x45ca830 [GstProxyPad|proxypad128] __func__ = "gst_proxy_pad_chain_default" #18 0x00007f679f7fcb3d in gst_pad_chain_data_unchecked (pad=pad@entry=0x458c870 [GstGhostPad|sink], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4327 chainfunc = 0x7f679f7eb7f0 <gst_proxy_pad_chain_default> ret = <optimized out> parent = 0x3b87a90 [WebKitGLVideoSink|webkitglvideosink4] handled = 0 __PRETTY_FUNCTION__ = "gst_pad_chain_data_unchecked" #19 0x00007f679f7feca9 in gst_pad_push_data (pad=pad@entry=0x45caa90 [GstProxyPad|proxypad129], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4583 peer = 0x458c870 [GstGhostPad|sink] ret = GST_FLOW_OK handled = 0 __PRETTY_FUNCTION__ = "gst_pad_push_data" #20 0x00007f679f805f12 in gst_pad_push (pad=pad@entry=0x45caa90 [GstProxyPad|proxypad129], buffer=buffer@entry=0x4c987e0 [GstBuffer]) at gstpad.c:4702 res = <optimized out> __func__ = "gst_pad_push" #21 0x00007f679f7eb883 in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x4c987e0 [GstBuffer]) at gstghostpad.c:127 res = <optimized out> internal = 0x45caa90 [GstProxyPad|proxypad129] __func__ = "gst_proxy_pad_chain_default" #22 0x00007f679f7fcb3d in gst_pad_chain_data_unchecked (pad=pad@entry=0x458caf0 [GstGhostPad|sink], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4327 chainfunc = 0x7f679f7eb7f0 <gst_proxy_pad_chain_default> ret = <optimized out> parent = 0x3baad20 [GstFPSDisplaySink|sink] handled = 0 __PRETTY_FUNCTION__ = "gst_pad_chain_data_unchecked" #23 0x00007f679f7feca9 in gst_pad_push_data (pad=pad@entry=0x47ccd20 [GstGhostPad|src], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4583 peer = 0x458caf0 [GstGhostPad|sink] ret = GST_FLOW_OK handled = 0 __PRETTY_FUNCTION__ = "gst_pad_push_data" #24 0x00007f679f805f12 in gst_pad_push (pad=pad@entry=0x47ccd20 [GstGhostPad|src], buffer=buffer@entry=0x4c987e0 [GstBuffer]) at gstpad.c:4702 res = <optimized out> __func__ = "gst_pad_push" #25 0x00007f679f7eb883 in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x4c987e0 [GstBuffer]) at gstghostpad.c:127 res = <optimized out> internal = 0x47ccd20 [GstGhostPad|src] __func__ = "gst_proxy_pad_chain_default" #26 0x00007f679f7fcb3d in gst_pad_chain_data_unchecked (pad=pad@entry=0x47cec80 [GstProxyPad|proxypad139], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4327 chainfunc = 0x7f679f7eb7f0 <gst_proxy_pad_chain_default> ret = <optimized out> parent = 0x47ccd20 [GstGhostPad|src] handled = 0 __PRETTY_FUNCTION__ = "gst_pad_chain_data_unchecked" #27 0x00007f679f7feca9 in gst_pad_push_data (pad=pad@entry=0x482c140 [GstPad|src], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4583 peer = 0x47cec80 [GstProxyPad|proxypad139] ret = GST_FLOW_OK handled = 0 __PRETTY_FUNCTION__ = "gst_pad_push_data" #28 0x00007f679f805f12 in gst_pad_push (pad=0x482c140 [GstPad|src], buffer=0x4c987e0 [GstBuffer]) at gstpad.c:4702 res = <optimized out> __func__ = "gst_pad_push" #29 0x00007f679f90f577 in gst_base_transform_chain (pad=<optimized out>, parent=0x4822340 [GstVideoConvert|conv2], buffer=<optimized out>) at gstbasetransform.c:2330 position_out = <optimized out> trans = 0x4822340 [GstVideoConvert|conv2] klass = 0x44e4020 priv = 0x4822270 ret = <optimized out> position = 18446744073709551615 [99:99:99.999999999] timestamp = <optimized out> duration = <optimized out> outbuf = 0x4c987e0 [GstBuffer] __PRETTY_FUNCTION__ = "gst_base_transform_chain" #30 0x00007f679f7fcb3d in gst_pad_chain_data_unchecked (pad=pad@entry=0x482c390 [GstPad|sink], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4327 chainfunc = 0x7f679f90f400 <gst_base_transform_chain> ret = <optimized out> parent = 0x4822340 [GstVideoConvert|conv2] handled = 0 __PRETTY_FUNCTION__ = "gst_pad_chain_data_unchecked" #31 0x00007f679f7feca9 in gst_pad_push_data (pad=pad@entry=0x473bc90 [GstPad|src], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4583 peer = 0x482c390 [GstPad|sink] ret = GST_FLOW_OK handled = 0 __PRETTY_FUNCTION__ = "gst_pad_push_data" #32 0x00007f679f805f12 in gst_pad_push (pad=0x473bc90 [GstPad|src], buffer=0x4c987e0 [GstBuffer]) at gstpad.c:4702 res = <optimized out> __func__ = "gst_pad_push" #33 0x00007f679f90f577 in gst_base_transform_chain (pad=<optimized out>, parent=0x4741170 [GstVideoBalance|videobalance], buffer=<optimized out>) at gstbasetransform.c:2330 position_out = <optimized out> trans = 0x4741170 [GstVideoBalance|videobalance] klass = 0x44de380 priv = 0x47410a0 ret = <optimized out> position = 18446744073709551615 [99:99:99.999999999] timestamp = <optimized out> duration = <optimized out> outbuf = 0x4c987e0 [GstBuffer] __PRETTY_FUNCTION__ = "gst_base_transform_chain" #34 0x00007f679f7fcb3d in gst_pad_chain_data_unchecked (pad=pad@entry=0x473ba40 [GstPad|sink], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4327 chainfunc = 0x7f679f90f400 <gst_base_transform_chain> ret = <optimized out> parent = 0x4741170 [GstVideoBalance|videobalance] handled = 0 __PRETTY_FUNCTION__ = "gst_pad_chain_data_unchecked" #35 0x00007f679f7feca9 in gst_pad_push_data (pad=pad@entry=0x482c5e0 [GstPad|src], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4583 peer = 0x473ba40 [GstPad|sink] ret = GST_FLOW_OK handled = 0 __PRETTY_FUNCTION__ = "gst_pad_push_data" #36 0x00007f679f805f12 in gst_pad_push (pad=0x482c5e0 [GstPad|src], buffer=0x4c987e0 [GstBuffer]) at gstpad.c:4702 res = <optimized out> __func__ = "gst_pad_push" #37 0x00007f679f90f577 in gst_base_transform_chain (pad=<optimized out>, parent=0x4887eb0 [GstVideoScale|scale], buffer=<optimized out>) at gstbasetransform.c:2330 position_out = <optimized out> trans = 0x4887eb0 [GstVideoScale|scale] klass = 0x44eb4b0 priv = 0x4887de0 ret = <optimized out> position = 18446744073709551615 [99:99:99.999999999] timestamp = <optimized out> duration = <optimized out> outbuf = 0x4c987e0 [GstBuffer] __PRETTY_FUNCTION__ = "gst_base_transform_chain" #38 0x00007f679f7fcb3d in gst_pad_chain_data_unchecked (pad=pad@entry=0x482c830 [GstPad|sink], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4327 chainfunc = 0x7f679f90f400 <gst_base_transform_chain> ret = <optimized out> parent = 0x4887eb0 [GstVideoScale|scale] handled = 0 __PRETTY_FUNCTION__ = "gst_pad_chain_data_unchecked" #39 0x00007f679f7feca9 in gst_pad_push_data (pad=pad@entry=0x482ccd0 [GstPad|src], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4583 peer = 0x482c830 [GstPad|sink] ret = GST_FLOW_OK handled = 0 __PRETTY_FUNCTION__ = "gst_pad_push_data" #40 0x00007f679f805f12 in gst_pad_push (pad=0x482ccd0 [GstPad|src], buffer=0x4c987e0 [GstBuffer]) at gstpad.c:4702 res = <optimized out> __func__ = "gst_pad_push" #41 0x00007f679f90f577 in gst_base_transform_chain (pad=<optimized out>, parent=0x458acc0 [GstVideoConvert|conv], buffer=<optimized out>) at gstbasetransform.c:2330 position_out = <optimized out> trans = 0x458acc0 [GstVideoConvert|conv] klass = 0x44e4020 priv = 0x458abf0 ret = <optimized out> position = 18446744073709551615 [99:99:99.999999999] timestamp = <optimized out> duration = <optimized out> outbuf = 0x4c987e0 [GstBuffer] __PRETTY_FUNCTION__ = "gst_base_transform_chain" #42 0x00007f679f7fcb3d in gst_pad_chain_data_unchecked (pad=pad@entry=0x482ca80 [GstPad|sink], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4327 chainfunc = 0x7f679f90f400 <gst_base_transform_chain> ret = <optimized out> parent = 0x458acc0 [GstVideoConvert|conv] handled = 0 __PRETTY_FUNCTION__ = "gst_pad_chain_data_unchecked" #43 0x00007f679f7feca9 in gst_pad_push_data (pad=pad@entry=0x47cea20 [GstProxyPad|proxypad138], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4583 peer = 0x482ca80 [GstPad|sink] ret = GST_FLOW_OK handled = 0 __PRETTY_FUNCTION__ = "gst_pad_push_data" #44 0x00007f679f805f12 in gst_pad_push (pad=pad@entry=0x47cea20 [GstProxyPad|proxypad138], buffer=buffer@entry=0x4c987e0 [GstBuffer]) at gstpad.c:4702 res = <optimized out> __func__ = "gst_pad_push" #45 0x00007f679f7eb883 in gst_proxy_pad_chain_default (pad=<optimized out>, parent=<optimized out>, buffer=0x4c987e0 [GstBuffer]) at gstghostpad.c:127 res = <optimized out> internal = 0x47cea20 [GstProxyPad|proxypad138] __func__ = "gst_proxy_pad_chain_default" #46 0x00007f679f7fcb3d in gst_pad_chain_data_unchecked (pad=pad@entry=0x47ccaa0 [GstGhostPad|sink], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4327 chainfunc = 0x7f679f7eb7f0 <gst_proxy_pad_chain_default> ret = <optimized out> parent = 0x45d22f0 [GstPlaySinkVideoConvert|vconv] handled = 0 __PRETTY_FUNCTION__ = "gst_pad_chain_data_unchecked" #47 0x00007f679f7feca9 in gst_pad_push_data (pad=pad@entry=0x473b350 [GstPad|src], type=type@entry=4112, data=data@entry=0x4c987e0) at gstpad.c:4583 peer = 0x47ccaa0 [GstGhostPad|sink] ret = GST_FLOW_OK handled = 0 __PRETTY_FUNCTION__ = "gst_pad_push_data" #48 0x00007f679f805f12 in gst_pad_push (pad=0x473b350 [GstPad|src], buffer=buffer@entry=0x4c987e0 [GstBuffer]) at gstpad.c:4702 res = <optimized out> __func__ = "gst_pad_push" #49 0x00007f671a6bc6a3 in gst_queue_push_one (queue=0x44d3810 [GstQueue|vqueue]) at gstqueue.c:1384 buffer = 0x4c987e0 [GstBuffer] data = <optimized out> is_list = <optimized out> result = GST_FLOW_OK __PRETTY_FUNCTION__ = "gst_queue_push_one" queue = 0x44d3810 [GstQueue|vqueue] ret = <optimized out> __PRETTY_FUNCTION__ = "gst_queue_loop" #50 gst_queue_loop (pad=<optimized out>) at gstqueue.c:1537 queue = 0x44d3810 [GstQueue|vqueue] ret = <optimized out> __PRETTY_FUNCTION__ = "gst_queue_loop" #51 0x00007f679f834927 in gst_task_func (task=0x4826950 [GstTask|vqueue:src]) at gsttask.c:328 lock = 0x473b3c0 tself = 0x47dd120 priv = 0x4826900 __PRETTY_FUNCTION__ = "gst_task_func" #52 0x00007f679eeeb0f4 in g_thread_pool_thread_proxy (data=<optimized out>) at ../glib/gthreadpool.c:354 task = 0x4715610 pool = <optimized out> #53 0x00007f679eeea7f2 in g_thread_proxy (data=0x47dd120) at ../glib/gthread.c:807 thread = 0x47dd120 __func__ = "g_thread_proxy" #54 0x00007f679ff51432 in start_thread (arg=<optimized out>) at pthread_create.c:477 ret = <optimized out> pd = <optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140079863068416, 324295936973853109, 140079873548110, 140079873548111, 140079873548256, 140079863068416, -410419535352573515, -410075481890631243}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}} not_first_call = 0 #55 0x00007f679d954913 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95