# Kernel panic not syncing timeout not all cpus entered broadcast exception handler

**URL:** <https://community.ipfire.org/t/kernel-panic-not-syncing-timeout-not-all-cpus-entered-broadcast-exception-handler/5773>\
**Category:** Hardware\
**Created:** [8 July 2021 14:47 UTC](https://community.ipfire.org/t/kernel-panic-not-syncing-timeout-not-all-cpus-entered-broadcast-exception-handler/5773 "2021-07-08T14:47:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mpyusko](https://community.ipfire.org/user_avatar/community.ipfire.org/mpyusko/32/8466_2.png) [@mpyusko](https://community.ipfire.org/u/mpyusko)\
**Post date:** [8 July 2021 14:47 UTC](https://community.ipfire.org/t/kernel-panic-not-syncing-timeout-not-all-cpus-entered-broadcast-exception-handler/5773/1 "2021-07-08T14:47:36Z")

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It started doing this after I installed 157, but not until I rebooted it.

Kernel panic - not syncing: Timeout: Not all CPUs entered broadcast exception handler

[https://fireinfo.ipfire.org/profile/39761a81de616c1ed55250becfd859e31ef5d743](https://fireinfo.ipfire.org/profile/39761a81de616c1ed55250becfd859e31ef5d743)  
 ![image](https://community.ipfire.org/uploads/default/original/2X/9/9f40bfe72ffcc8513bbbff726283c7221e44c832.png)

I read online and this seems to be related tot he processor C States. I tried enabling Watchdog in the BIOS, but it kept getting false triggers. I do have the option in the BIOS for “Max C State 3”, currently disabled. Not sure if that will help in this case.

 ![image](https://community.ipfire.org/uploads/default/original/2X/a/aa25d582ae748f9fc6fa14dbb8ddc9175199e971.jpeg)

The long leading gap, the firewall was down. then yout se the frequent reboots after I enabled Watchdog in the BIOS. The final, longer gap is where I disabled Watchdog, it has been running fine ever since. (but may crap out later, who knows? it’s done this 4 times since Sunday Evening)

The CPU is older, but the Mobo and all the other internals are 7 months to a year old.

Thoughts?