syzbot

kernel panic at kern/src/ns/tree_file.c:828, from core 1: assertion failed: tree_file_is_dir(new_parent)
Stack Backtrace on Core 1:
#01 [<0xffffffffc200a2dc>] in backtrace at src/kdebug.c:220
#02 [<0xffffffffc2009afd>] in _panic at src/init.c:268
#03 [<0xffffffffc2043c23>] in tree_file_rename at src/ns/tree_file.c:828
#04 [<0xffffffffc2043db7>] in tree_chan_rename at src/ns/tree_file.c:923
#05 [<0xffffffffc20335d8>] in __namec_from at src/ns/chan.c:1294
#06 [<0xffffffffc2033fdf>] in namec at src/ns/chan.c:1516
#07 [<0xffffffffc203de41>] in sysrename at src/ns/sysfile.c:874
#08 [<0xffffffffc2055cc2>] in sys_rename at src/syscall.c:2349
#09 [<0xffffffffc2059409>] in syscall at src/syscall.c:2528
#10 [<0xffffffffc20595d4>] in run_local_syscall at src/syscall.c:2563
#11 [<0xffffffffc2059b09>] in prep_syscalls at src/syscall.c:2583
#12 [<0xffffffffc20ab36a>] in sysenter_callwrapper at arch/x86/trap.c:854