go tool link: exit status 2
runtime: failed to create new OS thread (have 4 already; errno=11)
runtime: may need to increase max user processes (ulimit -u)
fatal error: newosproc

runtime stack:
runtime.throw(0x5f8761, 0x9)
	/usr/local/go/src/runtime/panic.go:616 +0x81
runtime.newosproc(0xc4200c0800, 0xc4200ce000)
	/usr/local/go/src/runtime/os_linux.go:164 +0x1af
runtime.newm1(0xc4200c0800)
	/usr/local/go/src/runtime/proc.go:1879 +0x113
runtime.newm(0x0, 0xc42001a000)
	/usr/local/go/src/runtime/proc.go:1858 +0x9b
runtime.startm(0xc42001a000, 0x6f5b00)
	/usr/local/go/src/runtime/proc.go:2002 +0x138
runtime.handoffp(0xc42001a000)
	/usr/local/go/src/runtime/proc.go:2029 +0x55
runtime.stoplockedm()
	/usr/local/go/src/runtime/proc.go:2097 +0x101
runtime.schedule()
	/usr/local/go/src/runtime/proc.go:2493 +0x2da
runtime.park_m(0xc420000180)
	/usr/local/go/src/runtime/proc.go:2604 +0xb6
runtime.mcall(0x0)
	/usr/local/go/src/runtime/asm_amd64.s:351 +0x5b

goroutine 1 [chan receive, locked to thread]:
runtime.gopark(0x607de8, 0xc4200e6058, 0x5f96c4, 0xc, 0xc42001ae17, 0x3)
	/usr/local/go/src/runtime/proc.go:291 +0x11a
runtime.goparkunlock(0xc4200e6058, 0x5f96c4, 0xc, 0x17, 0x3)
	/usr/local/go/src/runtime/proc.go:297 +0x5e
runtime.chanrecv(0xc4200e6000, 0x0, 0x1, 0x415558)
	/usr/local/go/src/runtime/chan.go:518 +0x2f2
runtime.chanrecv1(0xc4200e6000, 0x0)
	/usr/local/go/src/runtime/chan.go:400 +0x2b
runtime.gcenable()
	/usr/local/go/src/runtime/mgc.go:217 +0x6f
runtime.main()
	/usr/local/go/src/runtime/proc.go:161 +0x11e
runtime.goexit()
	/usr/local/go/src/runtime/asm_amd64.s:2361 +0x1
Makefile:35: *** syz-env failed.  Stop.