Same here
Reinstalled big sur, same problem but I don't use external monitors, nor time machine. I'm on a new version of big sur.
panic(cpu 4 caller 0xffffff801136ea25): userspace watchdog timeout: no successful checkins from com.apple.logd in 120 seconds
service returned not alive with context : unresponsive dispatch queue(s): com.apple.firehose.io-wl
service: com.apple.logd, total successful checkins since load (64910 seconds ago): 6480, last successful checkin: 120 seconds ago
service: com.apple.WindowServer, total successful checkins since load (64880 seconds ago): 6477, last successful checkin: 110 seconds ago
mrseo
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the same, please fix this.