# Asterisk crash ERROR channel.c: FRACK!, Failed assertion bad magic number 0x0

**URL:** <https://community.asterisk.org/t/asterisk-crash-error-channel-c-frack-failed-assertion-bad-magic-number-0x0/83217>\
**Category:** Asterisk Support\
**Created:** [March 24, 2020, 7:03am UTC](https://community.asterisk.org/t/asterisk-crash-error-channel-c-frack-failed-assertion-bad-magic-number-0x0/83217 "2020-03-24T07:03:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![tyagisharad007](https://avatars.discourse-cdn.com/v4/letter/t/47e85d/32.png) [@tyagisharad007](https://community.asterisk.org/u/tyagisharad007)\
**Post date:** [March 24, 2020, 7:03am UTC](https://community.asterisk.org/t/asterisk-crash-error-channel-c-frack-failed-assertion-bad-magic-number-0x0/83217/1 "2020-03-24T07:03:51Z")

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Hi  
I am using asterisk 16.7.0 Since January 2020 Recently my asterisk got crashed by giving following Error during normal operation.

[Mar 22 17:51:16] ERROR[19700][C-00024a01] channel.c: FRACK!, Failed assertion bad magic number 0x0 for object 0x7f83c40a1650 (0)

My syslogs are as follows:

Mar 22 17:51:16 Spark-61 kernel: [5756379.931979] mm/pgtable-generic.c:40: bad pmd 00000000346a9b14(8000000002a008e7)

Mar 22 17:51:16 Spark-61 kernel: [5756379.935527] asterisk[19528]: segfault at 80 ip 0000564ac4776dfe sp 00007f8394b12110 error 4 in asterisk[564ac4708000+1da000]

Mar 22 17:51:16 Spark-61 kernel: [5756379.935557] Code: 55 48 8d 0d e4 21 18 00 ba 73 14 00 00 48 8d 35 28 af 17 00 e8 83 69 14 00 48 83 c4 20 e9 97 f7 ff ff 48 89 df e8 02 d8 00 00 \<48\> 83 b8 80 00 00 00 00 0f 84 e5 03 00 00 4c 8b 75 b8 4d 85 f6 0f

Mar 22 17:51:16 Spark-61 systemd[1]: asterisk.service: Main process exited, code=killed, status=11/SEGV

As this is my production server I have only these logs available. as this happens first time i have no clue why it is so. by the way this server runs ~250 to ~300 on working days but at the time of crash there were not more then 15 calls as this was Sunday. any help will be appreciated.

Thanks in Advance.

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**Author:** ![jcolp](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/jcolp/32/8848_2.png) [@jcolp](https://community.asterisk.org/u/jcolp)\
**Post date:** [March 24, 2020, 9:24am UTC](https://community.asterisk.org/t/asterisk-crash-error-channel-c-frack-failed-assertion-bad-magic-number-0x0/83217/2 "2020-03-24T09:24:02Z")

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Without a backtrace[1] the most that can be said is something likely tried to access some memory after it was freed.

[1] [https://wiki.asterisk.org/wiki/display/AST/Getting+a+Backtrace](https://wiki.asterisk.org/wiki/display/AST/Getting+a+Backtrace)

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**Author:** ![system](https://global.discourse-cdn.com/asterisk/original/2X/4/475d0c889911cfb84ac4881ad6df8b523e3f9105.png) [@system](https://community.asterisk.org/u/system)\
**Post date:** [April 23, 2020, 9:24am UTC](https://community.asterisk.org/t/asterisk-crash-error-channel-c-frack-failed-assertion-bad-magic-number-0x0/83217/3 "2020-04-23T09:24:11Z")

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Closed on April 23, 2020, 9:24am UTC

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