syzbot

panic: malloc: allocation too large, type = 31, size = 4294967688
Starting stack trace...
panic(ffffffff8302a117) at panic+0x1d0 sys/kern/subr_prf.c:229
malloc(100000188,1f,1) at malloc+0xcf4 sys/kern/kern_malloc.c:330
sys_semop(ffff8000ffff62a8,ffff8000323ff3a0,ffff8000323ff2f0) at sys_semop+0x234 sys/kern/sysv_sem.c:564
syscall(ffff8000323ff3a0) at syscall+0xaf8 mi_syscall sys/sys/syscall_mi.h:179 [inline]
syscall(ffff8000323ff3a0) at syscall+0xaf8 sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xd388c136a70, count: 252
End of stack trace.
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