Troubleshoot renderer crash on facebook

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Troubleshoot renderer crash on facebook

Postby edgardog » Tue Sep 08, 2020 10:14 am

Hi, I have an issue uploading a picture to facebook, where the renderer process dies (on cef client it basically opens google again).
I'm using linux64 (Ubuntu 16) and downloaded the latest CEF automated build to test ( cef_binary_85.3.1+g1306235+chromium-85.0.4183.83_linux32.tar.bz2 )
I also have this problem on my own build from source and also on an older branch.
I ran cefclient, enabled trace, tried to make a facebook post (with a picture) and as soon as the picture loads browser goes back to google.com.. so I stopped the trace and I notice a message saying :

Code: Select all
{"args":{},"cat":"renderer.scheduler","id2":{"local":"0x24a904a5cb40"},"name":"ShortIdlePeriod","ph":"b","pid":25607,"scope":"renderer.scheduler","tid":1,"ts":146847453424},
{"args":{},"cat":"cc","id2":{"local":"0x24a904b7f870"},"name":"ScheduledTasks","ph":"b","pid":25607,"scope":"cc","tid":7,"ts":146847480038},
{"args":{"state":{"tasks_pending":{"activate_tile_tasks_completed":false,"all_tile_tasks_completed":false,"draw_tile_tasks_completed":false}}},"cat":"cc","id2":{"local":"0x24a904b7f870"},"name":"ScheduledTasksState","ph":"n","pid":25607,"scope":"cc","tid":7,"ts":146847480062},
{"args":{"state":{"tasks_pending":{"activate_tile_tasks_completed":false,"all_tile_tasks_completed":false,"draw_tile_tasks_completed":false}}},"cat":"cc","id2":{"local":"0x24a904b7f870"},"name":"ScheduledTasksState","ph":"n","pid":25607,"scope":"cc","tid":7,"ts":146847480301},
{"args":{"state":{"tasks_pending":{"activate_tile_tasks_completed":true,"all_tile_tasks_completed":false,"draw_tile_tasks_completed":false}}},"cat":"cc","id2":{"local":"0x24a904b7f870"},"name":"ScheduledTasksState","ph":"n","pid":25607,"scope":"cc","tid":7,"ts":146847480318},
{"args":{},"cat":"cc","id2":{"local":"0x24a904b7f870"},"name":"ScheduledTasks","ph":"e","pid":25607,"scope":"cc","tid":7,"ts":146847480333},
{"args":{"params":{"byte_count":30},"source_type":"SOCKET"},"cat":"netlog","id":"0x3d1","name":"SOCKET_BYTES_SENT","ph":"n","pid":25606,"scope":"netlog","tid":25621,"ts":146847662657},
{"args":{"params":{"byte_count":8},"source_type":"SOCKET"},"cat":"netlog","id":"0x3d1","name":"SSL_SOCKET_BYTES_SENT","ph":"n","pid":25606,"scope":"netlog","tid":25621,"ts":146847662670},
{"args":{"browser_context":"0x387bf2f9cb00","render_process_host":"0x387bf37ed600"},"cat":"shutdown","id2":{"local":"0x387bf37ed600"},"name":"Cleanup in progress","ph":"b","pid":25573,"scope":"shutdown","tid":25573,"ts":146847693507},
{"args":{"Initial URL":"http://www.google.com/","Net Error Code":0,"URL":"https://www.google.com/"},"cat":"navigation","id2":{"local":"0x387bf3aaa800"},"name":"Navigation StartToCommit","ph":"b","pid":25573,"scope":"navigation:StartToCommit","tid":25573,"ts":146847700788},



Then I tried running cefclient with --single-process , and it generates a segfault.. so I ran it with gdb and printed the backtrace and got:

Code: Select all
[New Thread 0x7fff7159e700 (LWP 28708)]
[New Thread 0x7fff70d9d700 (LWP 28709)]
[New Thread 0x7fff7059c700 (LWP 28710)]
[Thread 0x7fff70d9d700 (LWP 28709) exited]
[Thread 0x7fff7159e700 (LWP 28708) exited]

Thread 24 "Chrome_InProcRe" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffa51b2700 (LWP 28687)]
0x00002b8b1934b1cb in ?? ()
(gdb) bt
#0  0x00002b8b1934b1cb in ?? ()
#1  0x00000d9500000000 in ?? ()
#2  0x00007fffb00ddb68 in ?? ()
#3  0xffffffff00000000 in ?? ()
#4  0x000000003bec7267 in ?? ()
#5  0x00000000000812d4 in ?? ()
#6  0x00000d950a83f355 in ?? ()
#7  0x000000000000000a in ?? ()
#8  0x00000d9508041da9 in ?? ()
#9  0x00000d9508dbb7cd in ?? ()
#10 0x00000d9508dbb175 in ?? ()
#11 0x000000000000000a in ?? ()
#12 0x00007fffa51b0360 in ?? ()
#13 0x00000d95000be233 in ?? ()
#14 0x00000d9508040329 in ?? ()
#15 0x00000d9508dbb175 in ?? ()
#16 0x00000d9508dbb7cd in ?? ()
#17 0x00000d950a7b4bf9 in ?? ()
#18 0x00007fffa51b03c0 in ?? ()
#19 0x00007ffff2136c35 in Builtins_InterpreterEntryTrampoline () from /home/v3/Code/scratchpad/official/cef_binary_85.3.1+g1306235+chromium-85.0.4183.83_linux64/build/tests/cefclient/Release/libcef.so
#20 0x00000d9500a55fb0 in ?? ()
#21 0x00000d9509780f3d in ?? ()
#22 0x00000d9508040171 in ?? ()
#23 0x00000d9508dbb7cd in ?? ()
#24 0x00000d950a7b526d in ?? ()
#25 0x00000d9509b616dd in ?? ()
#26 0x000000000000007a in ?? ()
#27 0x00000d95086ce2ed in ?? ()
#28 0x00000d950a1d403d in ?? ()
#29 0x00000d950a83f355 in ?? ()
#30 0x00007fffa51b03f8 in ?? ()
#31 0x00007ffff212e01f in Builtins_ArgumentsAdaptorTrampoline () from /home/v3/Code/scratchpad/official/cef_binary_85.3.1+g1306235+chromium-85.0.4183.83_linux64/build/tests/cefclient/Release/libcef.so
#32 0x00000d950a82a259 in ?? ()
#33 0x0000000000000000 in ?? ()
(gdb)



Should I ran a debug build in order to track the problem further?
Any pointers in how can I trace the problem?

Thanks
edgardog
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Re: Troubleshoot renderer crash on facebook

Postby magreenblatt » Tue Sep 08, 2020 12:29 pm

Running a Debug build with gdb be a good start. I'm a bit surprised that your stack trace doesn't include symbols, since the libcef binaries should include symbol information. You can also attach gdb to the renderer process as described here.
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Re: Troubleshoot renderer crash on facebook

Postby edgardog » Tue Sep 08, 2020 2:11 pm

Thanks.
I tried the steps to run GDB on the renderer process and worked.. but gave me the same dump

Code: Select all
[New Thread 0x7fffb2557700 (LWP 29753)]

Thread 1 "cefclient" received signal SIGSEGV, Segmentation fault.
0x00002ca922ddd0eb in ?? ()
(gdb) bt
#0  0x00002ca922ddd0eb in ?? ()
#1  0x00000ba300000000 in ?? ()
#2  0x00000000008c3bc0 in ?? ()
#3  0xffffffff00000000 in ?? ()
#4  0x000000003bec7267 in ?? ()
#5  0x00000000000806d4 in ?? ()
#6  0x00000ba30b21bd79 in ?? ()
#7  0x000000000000000a in ?? ()
#8  0x00000ba308041da9 in ?? ()
#9  0x00000ba3082f3ab5 in ?? ()
#10 0x00000ba3082f345d in ?? ()
#11 0x000000000000000a in ?? ()
#12 0x00007fffffffbb70 in ?? ()
#13 0x00000ba3001e06f3 in ?? ()
#14 0x00000ba308040329 in ?? ()
#15 0x00000ba3082f345d in ?? ()
#16 0x00000ba3082f3ab5 in ?? ()
#17 0x00000ba308cfd635 in ?? ()
#18 0x00007fffffffbbd0 in ?? ()
#19 0x00007ffff2136c35 in Builtins_InterpreterEntryTrampoline ()
   from /home/v3/Code/scratchpad/official/cef_binary_85.3.1+g1306235+chromium-85.0.4183.83_linux64/build/tests/cefclient/Release/libcef.so
#20 0x00000ba300a55fb0 in ?? ()
---Type <return> to continue, or q <return> to quit---
#21 0x00000ba3087816f1 in ?? ()
#22 0x00000ba308040171 in ?? ()
#23 0x00000ba3082f3ab5 in ?? ()
#24 0x00000ba308cfdca9 in ?? ()
#25 0x00000ba30a1e76b9 in ?? ()
#26 0x000000000000007a in ?? ()
#27 0x00000ba30b365d85 in ?? ()
#28 0x00000ba308a45ab1 in ?? ()
#29 0x00000ba30b21bd79 in ?? ()
#30 0x00007fffffffbc08 in ?? ()
#31 0x00007ffff212e01f in Builtins_ArgumentsAdaptorTrampoline ()
   from /home/v3/Code/scratchpad/official/cef_binary_85.3.1+g1306235+chromium-85.0.4183.83_linux64/build/tests/cefclient/Release/libcef.so
#32 0x00000ba308ee715d in ?? ()
#33 0x0000000000000000 in ?? ()



I'll start building a debug version and test with that and probably be back here with more questions... Thanks!
edgardog
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Posts: 78
Joined: Mon Feb 01, 2016 2:05 pm

Re: Troubleshoot renderer crash on facebook

Postby edgardog » Thu Sep 10, 2020 9:38 am

I was doing something stupid with the standard distrib.. I ran Cmake to create the Release and not the Debug.
I realized this after building with Debug enabled (I usually build from source only release).
Now on both versions (the one that I built from source and the standard binary distrib) when I try to run it single-process it fails on some setlocale "C" check for wtf_string.cc(173)....

But I tried the xterm GDB debugger attach for multiprocess and that one starts fine.. when I try to upload a picture on a facebook story one of the renderer process dies, but on the Debug build I get only this:

Code: Select all
Type "apropos word" to search for commands related to "word"...
Reading symbols from /home/v3/Code/scratchpad/official/cef_binary_85.3.1+g1306235+chromium-85.0.4183.83_linux64/build/tests/cefclient/Debug/cefclient...done.
Starting program: /home/v3/Code/scratchpad/official/cef_binary_85.3.1+g1306235+chromium-85.0.4183.83_linux64/build/tests/cefclient/Debug/cefclient --type=renderer --no-sandbox --log-file=/home/v3/Code/scratchpad/official/cef_binary_85.3.1+g1306235+chromium-85.0.4183.83_linux64/build/tests/cefclient/Debug/debug.log --field-trial-handle=14485173593974179704,9614135995170544178,131072 --enable-features=CastMediaRouteProvider --lang=en-US --no-zygote --log-file=/home/v3/Code/scratchpad/official/cef_binary_85.3.1+g1306235+chromium-85.0.4183.83_linux64/build/tests/cefclient/Debug/debug.log --num-raster-threads=1 --renderer-client-id=5 --no-v8-untrusted-code-mitigations --shared-files=v8_snapshot_data:100
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffdbc38700 (LWP 4573)]
[New Thread 0x7fffdb437700 (LWP 4574)]
[New Thread 0x7fffdac36700 (LWP 4575)]
[New Thread 0x7fffda435700 (LWP 4576)]
[New Thread 0x7fffd9c34700 (LWP 4577)]
[New Thread 0x7fffd9433700 (LWP 4583)]
[New Thread 0x7fffd8c32700 (LWP 4584)]
[New Thread 0x7fffbbfff700 (LWP 4585)]
[New Thread 0x7fffbb7fe700 (LWP 4586)]
[New Thread 0x7fffbaffd700 (LWP 4596)]
[New Thread 0x7fffb8dd3700 (LWP 4601)]
---Type <return> to continue, or q <return> to quit---

Thread 1 "cefclient" received signal SIGSEGV, Segmentation fault.
0x000021f09f204cf0 in ?? ()
(gdb) bt
#0  0x000021f09f204cf0 in ?? ()
#1  0x00001c5509e705d9 in ?? ()
#2  0x0000000000000000 in ?? ()
(gdb)



I built it using symbol_level=1 .. should I try using =2 ?

I would appreciate any pointers to try to troubleshoot this problem.

Best Regards
edgardog
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Re: Troubleshoot renderer crash on facebook

Postby magreenblatt » Thu Sep 10, 2020 9:49 am

Single-process mode is not supported, so you'll have to debug the issue with multiprocess. Building with symbol_level=2 might fix the stack trace symbols issue.
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Re: Troubleshoot renderer crash on facebook

Postby edgardog » Fri Sep 11, 2020 8:31 am

Need some guidance in here on how to continue...
I made a build (debug with symbol_level=2). I can tell the binary distrib is now quite big compared to symbol_level=1 (2.7GB now so definitively the files are bigger).
But when I run with GDB and do the facebook post I get again:
Code: Select all
Thread 1 "cefclient" received signal SIGSEGV, Segmentation fault.
0x000029dec93b5770 in ?? ()
(gdb) bt
#0  0x000029dec93b5770 in ?? ()
#1  0x00001c8f0a88adf1 in ?? ()
#2  0x0000000000000000 in ?? ()
(gdb)



I'm not quite sure what else to try.
The renderer seems to die but I can't figure out why.
I would appreciante some guidance on how to keep troubleshooting this problem,
Thanks!
edgardog
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Posts: 78
Joined: Mon Feb 01, 2016 2:05 pm

Re: Troubleshoot renderer crash on facebook

Postby edgardog » Mon Sep 14, 2020 8:23 am

I seem to be getting the same problem using Chromium as well, so its not a specific CEF issue but an upstream problem.
There is no issue using chrome (same branch for Chrome, Chromium and CEF). I'll continue troubleshooting this with Chromium.

Thanks for the help.
edgardog
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Posts: 78
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