What steps will reproduce the problem?
1. run a fuse daemon on OS X
2. try to catch SIGINT and SIGQUIT (this works on Linux)
3. send SIGINT (nothing)
4. send SIGQUIT (nothing)
5. send SIGINT again (runtime crash)

What is the expected output? What do you see instead?
Graceful shutdown.

2013/02/17 10:42:55 CAMLI StatFS
2013/02/17 10:42:55 Root lookup of "Backups.backupdb" = <nil-BlobRef>
2013/02/17 10:42:55 Root lookup of "mach_kernel" = <nil-BlobRef>
2013/02/17 10:42:55 Root lookup of "Backups.backupdb" = <nil-BlobRef>
2013/02/17 10:42:55 CAMLI StatFS
2013/02/17 10:42:55 Root lookup of "Backups.backupdb" = <nil-BlobRef>
2013/02/17 10:42:55 CAMLI StatFS
2013/02/17 10:42:55 Root lookup of "._." = <nil-BlobRef>
2013/02/17 10:42:55 Root lookup of "._." = <nil-BlobRef>
^C^\^C^\runtime: split stack overflow: 0xc20010cab0 < 0xc20010e000
fatal error: runtime: split stack overflow

goroutine 1 [syscall]:
runtime.entersyscall()
    /Users/bradfitz/go/src/pkg/runtime/proc.c:1052 +0x19a
syscall.Syscall()
    /Users/bradfitz/go/src/pkg/syscall/asm_darwin_amd64.s:14 +0x5
syscall.read(0x4, 0xc20011b000, 0x2000, 0x2000, 0xc20010e3c8, ...)
    /Users/bradfitz/go/src/pkg/syscall/zsyscall_darwin_amd64.go:905 +0x70
syscall.Read(0x4, 0xc20011b000, 0x2000, 0x2000, 0x2000, ...)
    /Users/bradfitz/go/src/pkg/syscall/syscall_unix.go:132 +0x5a
camlistore.org/third_party/code.google.com/p/rsc/fuse.(*Conn).ReadRequest(0xc20010d000,
0xc2000b3e40, 0xc2000bad70, 0xc200119340)
    /Users/bradfitz/src/camlistore.org/third_party/code.google.com/p/rsc/fuse/fuse.go:287 +0xe3
----- stack segment boundary -----
camlistore.org/third_party/code.google.com/p/rsc/fuse.(*Conn).Serve(0xc20010d000,
0xc2000b3e40, 0xc2000bad70, 0x0, 0x0, ...)
    /Users/bradfitz/src/camlistore.org/third_party/code.google.com/p/rsc/fuse/serve.go:242 +0x3ba
main.main()
    /Users/bradfitz/src/camlistore.org/cmd/cammount/cammount.go:91 +0x669
runtime.main()
    /Users/bradfitz/go/src/pkg/runtime/proc.c:255 +0x8f
runtime.goexit()
    /Users/bradfitz/go/src/pkg/runtime/proc.c:284

goroutine 3 [syscall]:
os/signal.loop()
    /Users/bradfitz/go/src/pkg/os/signal/signal_unix.go:20 +0x1c
created by os/signal.init·1
    /Users/bradfitz/go/src/pkg/os/signal/signal_unix.go:26 +0x2f

goroutine 4 [chan receive]:
main.func·002(0xc2000b6438, 0x0)
    /Users/bradfitz/src/camlistore.org/cmd/cammount/cammount.go:83 +0x31
created by main.main
    /Users/bradfitz/src/camlistore.org/cmd/cammount/cammount.go:84 +0x47e
ba12:~ bradfitz$ 
ba12:~ bradfitz$ 
ba12:~ bradfitz$ 
ba12:~ bradfitz$ 


$ go version
go version devel +bad13530d9b3 Fri Feb 08 09:20:05 2013 -0800 darwin/amd64


Whittling down Camlistore's cammount program, this should reproduce it:  (FUSE crashing
seems to have wedged this machine, so I can't test until I've rebooted...)

$ cat splitstack.go
package main

import (
    "io/ioutil"
    "log"
    "os"
    "os/signal"
    "syscall"

    "camlistore.org/third_party/code.google.com/p/rsc/fuse"
)

func main() {
    dir, err := ioutil.TempDir("", "")
    if err != nil {
        log.Fatal(err)
    }

    sigc := make(chan os.Signal, 1)
    go func() {
        log.Fatalf("Signal %s received, shutting down.", <-sigc)
    }()
    signal.Notify(sigc, syscall.SIGQUIT, syscall.SIGTERM)

    conn, err := fuse.Mount(dir)
    if err != nil {
        log.Fatalf("Mount: %v", err)
    }

    err = conn.Serve(fs{})
    if err != nil {
        log.Fatalf("Serve: %v", err)
    }
    log.Printf("fuse process ending.")
}

type fs struct{}

func (fs) Root() (fuse.Node, fuse.Error) {
    return fs{}, nil
}

func (fs) Attr() fuse.Attr {
    return fuse.Attr{
        Mode: os.ModeDir | 0700,
        Uid:  uint32(os.Getuid()),
        Gid:  uint32(os.Getgid()),
    }
}

func (fs) ReadDir(intr fuse.Intr) ([]fuse.Dirent, fuse.Error) {
    return []fuse.Dirent{{Name: "Hello FUSE"}}, nil
}