braice
commented
7 years ago Hello
Seems that some piece of code have overwritten the actual_eit->next pointer, probably the code writing the sections. Then when this code goes through the list it fails
Can you run the code under valgrind in full verbose, I have an idea of where this could be coming from but valgrind will definitely help
Brice
2017-03-10 23:10 GMT-05:00 anphsw notifications@github.com:
I've got rare situation when mumudvb crashes at eit_find_by_tsid(). Here is backtrace:
Using host libthread_db library "/usr/lib/libthread_db.so.1". Core was generated by `/tmp/mumudvb -c /etc/dvb/mumudvb5.conf'. Program terminated with signal SIGSEGV, Segmentation fault.
0 0xb76c3c27 in eit_find_by_tsid (rewrite_vars=0xbfb85638,
service_id=2080, table_id=80 'P') at rewrite_eit.c:171 171 if((actual_eit->service_id==service_id)&&(actual_eit-> table_id==table_id)) [Current thread is 1 (Thread 0xb7424700 (LWP 15088))] (gdb) bt
0 0xb76c3c27 in eit_find_by_tsid (rewrite_vars=0xbfb85638,
service_id=2080, table_id=80 'P') at rewrite_eit.c:171
1 https://github.com/braice/MuMuDVB/pull/1 0xb76c3d48 in
eit_need_update (rewrite_vars=0xbfb85638, buf=0xb772ca88 "G@\022\036", raw=1) at rewrite_eit.c:217
2 https://github.com/braice/MuMuDVB/pull/2 0xb76c3ef8 in
eit_rewrite_new_global_packet (ts_packet=0xb772ca88 "G@\022\036", rewrite_vars=0xbfb85638) at rewrite_eit.c:254
3 https://github.com/braice/MuMuDVB/pull/3 0xb76bd2cb in main (argc=3,
argv=0xbfc529d4) at mumudvb.c:1658 (gdb) frame 0
0 0xb76c3c27 in eit_find_by_tsid (rewrite_vars=0xbfb85638,
service_id=2080, table_id=80 'P') at rewrite_eit.c:171 171 if((actual_eit->service_id==service_id)&&(actual_eit-> table_id==table_id)) (gdb) print actual_eit->service_id Cannot access memory at address 0xffffff23 (gdb) print actual_eit->table_id Cannot access memory at address 0xffffff27 (gdb) print actual_eit $9 = (eit_packet_t ) 0xffffff23 (gdb) print rewrite_vars->eit_packets $10 = (eit_packet_t ) 0xb772dda8
I will try to investigate and fix it I can upload core file and debugged binary, if anyone interested.
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anphsw
kslimani
danijelt
I've got rare situation when mumudvb crashes at eit_find_by_tsid(). Here is backtrace:
Using host libthread_db library "/usr/lib/libthread_db.so.1". Core was generated by `/tmp/mumudvb -c /etc/dvb/mumudvb5.conf'. Program terminated with signal SIGSEGV, Segmentation fault.
0 0xb76c3c27 in eit_find_by_tsid (rewrite_vars=0xbfb85638, service_id=2080, table_id=80 'P') at rewrite_eit.c:171
171 if((actual_eit->service_id==service_id)&&(actual_eit->table_id==table_id)) [Current thread is 1 (Thread 0xb7424700 (LWP 15088))] (gdb) bt
0 0xb76c3c27 in eit_find_by_tsid (rewrite_vars=0xbfb85638, service_id=2080, table_id=80 'P') at rewrite_eit.c:171
1 0xb76c3d48 in eit_need_update (rewrite_vars=0xbfb85638, buf=0xb772ca88 "G@\022\036", raw=1) at rewrite_eit.c:217
2 0xb76c3ef8 in eit_rewrite_new_global_packet (ts_packet=0xb772ca88 "G@\022\036", rewrite_vars=0xbfb85638) at rewrite_eit.c:254
3 0xb76bd2cb in main (argc=3, argv=0xbfc529d4) at mumudvb.c:1658
(gdb) frame 0
0 0xb76c3c27 in eit_find_by_tsid (rewrite_vars=0xbfb85638, service_id=2080, table_id=80 'P') at rewrite_eit.c:171
171 if((actual_eit->service_id==service_id)&&(actual_eit->table_id==table_id)) (gdb) print actual_eit->service_id Cannot access memory at address 0xffffff23 (gdb) print actual_eit->table_id Cannot access memory at address 0xffffff27 (gdb) print actual_eit $9 = (eit_packet_t ) 0xffffff23 (gdb) print rewrite_vars->eit_packets $10 = (eit_packet_t ) 0xb772dda8 (gdb) print *rewrite_vars->eit_packets $1 = {service_id = 13568768, table_id = 0 '\000', version = 1804933428, needs_update = -221, need_others = -1, last_section_number = -1, sections_stored = {-1 <repeats 39 times>, 453001287, 229638144, 13568768, -399243264, 1804933428, -221, -1 <repeats 41 times>, 469778503, 229638144, 13568768, -399243264, 1804933428, -221, -1 <repeats 41 times>, 486555719, 229638144, 13568768, -399243264, 1804933428, -221, -1 <repeats 41 times>, 503332935, 229638144, 13568768, -399243264, 1804933428, -221, -1 <repeats 41 times>, 520110151, 229638144, 13568768, -399243264, 1804933428, -221, -1 <repeats 23 times>}, full_eit_ok = -1, full_eit_sections = {0xffffffff <repeats 17 times>, 0x10004047, 0xdb00000, 0xcf0b00, 0xe8340800, 0x6b951934, 0xffffff23, 0xffffffff <repeats 41 times>, 0x11004047, 0xdb00000, 0xcf0b00, 0xe8340800, 0x6b951934, 0xffffff23, 0xffffffff <repeats 41 times>, 0x12004047, 0xdb00000, 0xcf0b00, 0xe8340800, 0x6b951934, 0xffffff23, 0xffffffff <repeats 41 times>, 0x13004047, 0xdb00000, 0xcf0b00, 0xe8340800, 0x6b951934, 0xffffff23, 0xffffffff <repeats 41 times>, 0x14004047, 0xdb00000, 0xcf0b00, 0xe8340800, 0x6b951934, 0xffffff23, 0xffffffff <repeats 41 times>, 0x15004047, 0xdb00000, 0xcf0b00, 0xe8340800}, continuity_counter = 1804933428, next = 0xffffff23}
I will try to investigate and fix it I can upload core file and debugged binary, if anyone interested.