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Sorry, my bad here. I had been playing around with using different signals last night and left the code using SIGALRM instead, which defaults to nostop noprint. When I switched back to using SIGUSR1 again, I had to use 'handle SIGUSR1 nostop noprint' on the native gdb.It may have decided that they are used by uClibc's threading library. Beyond here I do not think I can make any useful guesses; all the logic is different between gdb and gdbserver. You'd have to debug it.
If it's decided threading uses them, "handle SIGUSR1" should show nostop noprint alreayd. Otherwise, it may just never be notified of the signal - that would be a bug somewhere.
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