From a fresh jconsole session:

    9!:14''
        j901/j64/linux/beta-k/commercial/www.jsoftware.com/2019-09-16T17:03:03
    0j1 +. 0.1 + i.16
        1.11022e_16 4.44089e_16 4.44089e_16 ...
    0j1 +. 16.1  NB. hangs

Forgive the spam if this is a known issue and fixed in a later beta. Is the 
above known and reproducible on your machines?

About the only useful thing I can provide is a gdb backtrace. Cutting out the 
useless bit at the bottom:

#0  0x00007ffff7a6cbcc in jtzrem () from /j901/bin/libj.so
#1  0x00007ffff7a6cd21 in jtzgcd () from /j901/bin/libj.so
#2  0x00007ffff79cde6f in gcdZZ () from /j901/bin/libj.so
#3  0x00007ffff7996ca8 in jtva2 () from /j901/bin/libj.so
#4  0x00007ffff7995a6d in jtatomic2 () from /j901/bin/libj.so
#5  0x00007ffff796f7b9 in jtparsea () from /j901/bin/libj.so
#6  0x00007ffff796efe0 in jtparse () from /j901/bin/libj.so
#7  0x00007ffff7971aef in jtimmex () from /j901/bin/libj.so
#8  0x00007ffff79666a3 in jdo () from /j901/bin/libj.so
#9  0x00007ffff7966ac0 in JDo () from /j901/bin/libj.so
#10 0x0000000000401df0 in main ()

General pointers on J debugging certainly welcome. I would love to give more 
useful bug sleuthing details.

Cheers,
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