Chan_sip.c: FRACK!, Failed assertion bad magic number 0x0 for object 0x1e33630 (0)

[issam]

Hi,

Asterisk crashed with these messages in the log

[Sep  1 17:18:05] ERROR[23620] chan_sip.c: FRACK!, Failed assertion bad magic number 0x0 for object 0x1e33630 (0)
[Sep  1 17:18:05] ERROR[23620] : Got 14 backtrace records
# 0: /usr/sbin/asterisk(__ao2_ref+0xbb) [0x45e07b]
# 1: /usr/sbin/asterisk() [0x4605ca]
# 2: /usr/lib/asterisk/modules/chan_sip.so(+0x75b69) [0x7fc5a4801b69]
# 3: /usr/lib/asterisk/modules/chan_sip.so(+0x76a95) [0x7fc5a4802a95]
# 4: /usr/lib/asterisk/modules/chan_sip.so(+0xa84d3) [0x7fc5a48344d3]
# 5: /usr/lib/asterisk/modules/chan_sip.so(+0xaaca3) [0x7fc5a4836ca3]
# 6: /usr/lib/asterisk/modules/chan_sip.so(+0xada84) [0x7fc5a4839a84]
# 7: /usr/lib/asterisk/modules/chan_sip.so(+0xaf847) [0x7fc5a483b847]
# 8: /usr/lib/asterisk/modules/res_http_websocket.so(__ast_websocket_uri_cb+0xe54) [0x7fc5a62cf484]
# 9: /usr/sbin/asterisk() [0x60d238]
#10: /usr/sbin/asterisk() [0x60d75b]
#11: /usr/sbin/asterisk() [0x5c264c]
#12: /lib/x86_64-linux-gnu/libpthread.so.0(+0x76ba) [0x7fc610dbf6ba]
#13: /lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7fc6103994dd]

And this message in syslog

kernel: [11993449.727273] asterisk[23620]: segfault at 10 ip 00000000005ab9cb sp 00007fc566d16918 error 4 in asterisk[400000+30b000]

Unfortunately i don’t have a core dump.

Asterisk version 17.4
OS: Ubuntu 16
Using chan_sip with webrtc/websockets.

Any help appreciated.

Thanks

[jcolp]

Something in chan_sip tried to access something that already had its memory freed, or memory was overwritten. That’s the extent of what can be determined based on the above information.

[issam]

So it this a bug in chan_sip ?

[jcolp]

From the available information it would seem that way.

[issam]

Ok, thanks a lot. Would migrating to chan_pjsip be the best course of action ?

[david551]

Memory corruption can happen across threads, so it is not certain the original problem is in chan_sip.