bash-4.3$ kernel panic at kern/src/ns/tree_file.c:820, from core 0: assertion failed: tree_file_is_dir(new_parent)
Stack Backtrace on Core 0:
#01 [<0xffffffffc200a3b7>] in backtrace at src/kdebug.c:219
#02 [<0xffffffffc2009b7c>] in _panic at src/init.c:266
#03 [<0xffffffffc2043cc1>] in tree_file_rename at src/ns/tree_file.c:820
#04 [<0xffffffffc2043e57>] in tree_chan_rename at src/ns/tree_file.c:915
#05 [<0xffffffffc20336b8>] in __namec_from at src/ns/chan.c:1287
#06 [<0xffffffffc20340af>] in namec at src/ns/chan.c:1509
#07 [<0xffffffffc203df31>] in sysrename at src/ns/sysfile.c:874
#08 [<0xffffffffc2055a12>] in sys_rename at src/syscall.c:2349
#09 [<0xffffffffc2059149>] in syscall at src/syscall.c:2528
#10 [<0xffffffffc2059304>] in run_local_syscall at src/syscall.c:2563
#11 [<0xffffffffc2059839>] in prep_syscalls at src/syscall.c:2583
#12 [<0xffffffffc20aaf1a>] in sysenter_callwrapper at arch/x86/trap.c:859