chris hofmann Reporter
	Description • 14 years ago

looks like there might be a family of crash stacks that all have some similar elements and a possible indication of corruption that happens deeper in getting the images off the network or later processing.  Here are the signatures and link to stacks.  I'll also post a spreadsheet that lines up the stacks.

are there crash defenses we could insert in any of this code or ways to figure out if there is a single deeper root cause?  the total of all these might add up to hundereds of crashes per week/day.

[@ _CIpow_pentium4 ] 
http://crash-stats.mozilla.com/report/index/9a9912a7-5678-47fd-9d1e-f57582100604
http://crash-stats.mozilla.com/report/list?signature=_CIpow_pentium4
35

[@ PNGGetColorProfile ] 
http://crash-stats.mozilla.com/report/index/f2125744-61e8-4b33-9717-86eda2100604
http://crash-stats.mozilla.com/report/list?product=Firefox&query_search=signature&query_type=contains&query=PNGGetColorProfile&date=06%2F05%2F2010%2016%3A12%3A31&range_value=1&range_unit=weeks&hang_type=any&process_type=any&plugin_field=&plugin_query_type=&plugin_query=&do_query=1&signature=PNGGetColorProfile
2

[@ info_callback ] 
http://crash-stats.mozilla.com/report/index/59418aad-b156-453e-91e3-60e502100605
http://crash-stats.mozilla.com/report/list?product=Firefox&query_search=signature&query_type=contains&query=info_callback&date=06%2F05%2F2010%2016%3A13%3A51&range_value=1&range_unit=weeks&hang_type=any&process_type=any&plugin_field=&plugin_query_type=&plugin_query=&do_query=1&signature=info_callback
27

[@ MOZ_PNG_push_have_info ] 
http://crash-stats.mozilla.com/report/index/5f0e4fcb-8bbf-43d8-8c8c-21ad42100604
http://crash-stats.mozilla.com/report/list?product=Firefox&query_search=signature&query_type=contains&query=MOZ_PNG_push_have_info&date=06%2F05%2F2010%2016%3A14%3A59&range_value=1&range_unit=weeks&hang_type=any&process_type=any&plugin_field=&plugin_query_type=&plugin_query=&do_query=1&signature=MOZ_PNG_push_have_info
2

[@ MOZ_PNG_push_read_chunk ]
http://crash-stats.mozilla.com/report/index/b7b4c368-0ba6-4554-90d8-0f61d2100605
http://crash-stats.mozilla.com/report/list?product=Firefox&query_search=signature&query_type=contains&query=MOZ_PNG_push_read_chunk&date=06%2F05%2F2010%2016%3A16%3A34&range_value=1&range_unit=weeks&hang_type=any&process_type=any&plugin_field=&plugin_query_type=&plugin_query=&do_query=1&signature=MOZ_PNG_push_read_chunk
46

[@ MOZ_PNG_proc_some_data ] 
http://crash-stats.mozilla.com/report/index/d7fc5a53-4189-4fba-aeff-f7f0e2100604
http://crash-stats.mozilla.com/report/list?product=Firefox&query_search=signature&query_type=contains&query=MOZ_PNG_proc_some_data&date=06%2F05%2F2010%2016%3A18%3A55&range_value=1&range_unit=weeks&hang_type=any&process_type=any&plugin_field=&plugin_query_type=&plugin_query=&do_query=1&signature=MOZ_PNG_proc_some_data
16

[@ ReadDataOut ] 
http://crash-stats.mozilla.com/report/index/c59a7983-6000-4575-ba03-40b1f2100605
http://crash-stats.mozilla.com/report/list?product=Firefox&query_search=signature&query_type=contains&query=ReadDataOut&date=06%2F05%2F2010%2016%3A21%3A52&range_value=1&range_unit=weeks&hang_type=any&process_type=any&plugin_field=&plugin_query_type=&plugin_query=&do_query=1&signature=ReadDataOut
35

[@ ReadDataOut ] 
http://crash-stats.mozilla.com/report/index/c59a7983-6000-4575-ba03-40b1f2100605
another example of above

problems might go deeper but I've only traced this deep so far.

	chris hofmann Reporter
	Comment 3 • 14 years ago

here are counts of the signatures above and other similar for May and June to date

 181 _CIpow_pentium4

  12 PNGGetColorProfile

 103 info_callback
   3 @0x0 | info_callback

  17 MOZ_PNG_push_have_info
   4 @0x0 | MOZ_PNG_push_have_info
   1 nsCOMPtr_base::assign_assuming_AddRef(nsISupports*) | MOZ_PNG_push_have_info

 177 MOZ_PNG_push_read_chunk
  10 memcmp | MOZ_PNG_push_read_chunk
   4 memcpy_s | MOZ_PNG_push_read_chunk
   1 @0x0 | MOZ_PNG_push_read_chunk

 115 MOZ_PNG_proc_some_data
  10 @0x0 | MOZ_PNG_proc_some_data
   1 memcpy | MOZ_PNG_proc_some_data

  17 MOZ_PNG_process_data

 188 ReadDataOut
  35 @0x0 | ReadDataOut
  31 nsCOMPtr_base::assign_assuming_AddRef(nsISupports*) | ReadDataOut
   2 PL_DHashTableOperate | ReadDataOut
   2 @0x0 | ReadDataOut(nsIInputStream*, void*, char const*, unsigned int, unsigned int, unsigned int*)

	Joe Drew (not getting mail)
	Comment 4 • 14 years ago

Glenn, not sure if anything jumps out at you with this...

	chris hofmann Reporter
	Comment 5 • 14 years ago

I'm seeing some users with what looks like repeated, and start up crashes with no urls on these signatures as well with comments like this:

1 second after startup
133 seconds after last crash
firefox 3.6.3 _
signature CIpow_pentium4  
comment: i cant use my mozzila firefox ! can you fix it right now thanks .


1 sec. after start
8 since last crash
3.5.7 
ReadDataOut  
it didn't even start!? WTF??

I wonder if some kind of cache corruption could be involved.