so calling an ioctl seems to clear the global argc in klibc built with
gcc-9

163                                             if(ioctl (fd, LOOP_GET_STATUS, 
&loopinfo) == 0)
(gdb) bt
#0  find_unused_loop_device () at usr/utils/losetup.c:163
#1  0x0000000000401135 in main (argc=2, argv=0x7fffffffe618) at 
usr/utils/losetup.c:454
(gdb) n
164                                                     someloop++;             
/* in use */
(gdb) bt
#0  find_unused_loop_device () at usr/utils/losetup.c:164
#1  0x0000000000401135 in main (argc=0, argv=0x7fffffffe618) at 
usr/utils/losetup.c:454

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https://bugs.launchpad.net/bugs/1850184

Title:
  losetup -f broken in 2.0.6-1ubuntu2

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