I received the following abend immediately after executing bash:
+CEE0374C CONDITION=CEE3204S TOKEN=00030C84 59C3C5C5 00000000 234
WHILE RUNNING PROGRAM CELHV003
AT THE TIME OF INTERRUPT
PSW 078D2400 99A42246
GPR 0-3 0019EF2A 19E71C30 1969B29C 19E96678
GPR 4-7 19F28290 19E3F678 1969A2A8 99A4221A
GPR 8-B 19E96678 19EA7F60 19E75838 19F28B77
GPR C-F 1969F188 19E95D20 000001E8 00000000
+CEE3798I ATTEMPTING TO TAKE A DUMP FOR ABEND U4083 TO DATA SET:
etc.
After a lot of searching I found out I had the following line in my /etc/profile that triggers this behaviour:
LC_SYNTAX=En_Us.IBM-1047
Just decided to open this topic in case somebody else runs into the same situation.