syzbot

panic: pool_do_get: fdescpl free list modified: page 0xfffffd80666be000; item addr 0xfffffd80666be5e0; offset 0x48=0xdead4113
Starting stack trace...
panic(ffffffff828db730) at panic+0x16f sys/kern/subr_prf.c:229
pool_do_get(ffffffff82dedbb0,9,ffff80003596d4b8) at pool_do_get+0x483 sys/kern/subr_pool.c:739
pool_get(ffffffff82dedbb0,9) at pool_get+0xf0 sys/kern/subr_pool.c:582
fdcopy(ffff8000373d2ce0) at fdcopy+0x44 fdinit sys/kern/kern_descrip.c:1067 [inline]
fdcopy(ffff8000373d2ce0) at fdcopy+0x44 sys/kern/kern_descrip.c:1106
process_new(ffff80002a214a60,ffff8000373d2ce0,1) at process_new+0x390 sys/kern/kern_fork.c:273
fork1(ffff80003739dc68,1,ffffffff81dddec0,0,ffff80003596d6e0,0) at fork1+0x2ef sys/kern/kern_fork.c:399
syscall(ffff80003596d790) at syscall+0x854 mi_syscall sys/sys/syscall_mi.h:180 [inline]
syscall(ffff80003596d790) at syscall+0x854 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x716135f02ab0, count: 249
End of stack trace.