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It might have something to do with the fact that I tried to power the board using 3.3V pin... while at the same time plugging in usb cable to try to reprogram the board... I think I also just bricked my nano 33 iot this way :(

Thank you everyone for quick response! Actually, for most of the time nothing happened when I plugged this teensy in, no linux kernel message or whatever. What I posted is a rare case where "something" happened. @Frank B and @PaulStoffregen, I just had my Teensyduino 1.54 running on my linux...

I should add that a night before this happened, I made a mistake and connect +Vbat of my coin battery to On/Off pin instead of VBAT pin. and FWIW, here is the "Verbose Information from Teensy Loader"

My teensy 4.1 just died too.... with the message from linux kernel similar to the opening post: pressing the button for 15-17 sec will give a short flash of red LED, but didn't revive the teensy with the blink sketch. :( It happened after I tried to solder PSRAM onto the board, so may be I...