From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/13358 Path: news.gmane.org!.POSTED!not-for-mail From: Rabbitstack Newsgroups: gmane.linux.lib.musl.general Subject: Re: setrlimit hangs the process Date: Thu, 11 Oct 2018 17:14:59 +0200 Message-ID: References: <20180925153605.GF10209@port70.net> <20180925163850.GL17995@brightrain.aerifal.cx> <20181004150421.GC17110@brightrain.aerifal.cx> <20181004155302.GD17110@brightrain.aerifal.cx> <20181005004715.GF17110@brightrain.aerifal.cx> <20181009203640.GS10209@port70.net> <20181009204003.GK17110@brightrain.aerifal.cx> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="000000000000fe04640577f56f78" X-Trace: blaine.gmane.org 1539270804 31704 195.159.176.226 (11 Oct 2018 15:13:24 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 11 Oct 2018 15:13:24 +0000 (UTC) Cc: musl@lists.openwall.com To: Rich Felker Original-X-From: musl-return-13374-gllmg-musl=m.gmane.org@lists.openwall.com Thu Oct 11 17:13:20 2018 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by blaine.gmane.org with smtp (Exim 4.84_2) (envelope-from ) id 1gAceL-00087U-T3 for gllmg-musl@m.gmane.org; Thu, 11 Oct 2018 17:13:18 +0200 Original-Received: (qmail 30510 invoked by uid 550); 11 Oct 2018 15:15:26 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Original-Received: (qmail 30489 invoked from network); 11 Oct 2018 15:15:25 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=Dqs5NXyM40l81BMg8ouY+3ekUJeiWrnEpcftT/ai3Yo=; b=KIuhsSEVXDhxEZ6w6JXT9ZZUsmkoniTqHZQoUzuTr4rcSpszhHjHkCcKKIQTehHmdp eHwJ/w+IK9JTobTPY+hEkLIBvILHIz92V+cXPBXTfuJX0/QcNFTA3ouYEpUWJDl5oj7f 4agDLaV09y3mOi8r1AIRC+b+Sy/y+IOPy5IpY1KytJcEoCN3nrLjRHoYkiZhjv4dr1HQ cCRh9xiv9avX8+xewJAjBl4vVJekMuUCiBXEX3xVY7a1+Qpd8K4htkVKTq+RD9SMf7lM d/vYn1Q1B4kbfgwRKOWRehp55Vcsi2sYswD8k+ziB9iwOtOS7dDonXX37f6dD2ympqzU S3Gg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=Dqs5NXyM40l81BMg8ouY+3ekUJeiWrnEpcftT/ai3Yo=; b=gYexOywarN39Fr6pu+Ca7bT9Eaq38+M64Y+JrNXrZVeR2+6mR1/XIoqbBItaeJtGGJ wPqkVE/Vvy8UkoDZU1C1uI2G+rLMJMa5e8iDIVvTGGNLEyi0jg8w0ne/CFtTxGsWmGuz DXhHrcfUF03n1rDShU1oebXQHM8FTBjIAaJboz6UGgR6k1PAaJtn2AlWyQgPfEkSgVB4 QhPslJwVA3RUQqV+EjbOwsQDxBlGDhm4dQTknrArKKtCKoRu5umU8ThW4RzR9rgOcXES R09SoaVi2Wr5+/nhLhdOiuxQ4fKkwoNUAgcvEhUQkrIr6i1lFrMUEqM6thnCLNp8Msgq zvFQ== X-Gm-Message-State: ABuFfoiRsBkevdhHkDWV4cGm4b90SRSYD4YClejgsWb8kpe9HpeO1zc+ 9hc7z0kl298Jxi4AoAEqIQfO8/Klk01SIYmpUg== X-Google-Smtp-Source: ACcGV62LNBAHFaz8A2DGRy9ZPN69wbWN139vOR/dzPCZc5tpw505ZRCOUhOqranydYfbw8MKI3lMqOkDUBJQw81qH/s= X-Received: by 2002:a17:902:7e41:: with SMTP id a1-v6mr1929829pln.149.1539270913151; Thu, 11 Oct 2018 08:15:13 -0700 (PDT) In-Reply-To: <20181009204003.GK17110@brightrain.aerifal.cx> Xref: news.gmane.org gmane.linux.lib.musl.general:13358 Archived-At: --000000000000fe04640577f56f78 Content-Type: multipart/alternative; boundary="000000000000fe04600577f56f76" --000000000000fe04600577f56f76 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi I managed to reproduce the problem with minimal code snippet and can confirm it's definitely the Go stdlib signal handler that messes things up. Here's the code: package main import ( bpflib "github.com/iovisor/gobpf/elf" "os/signal" "os" "fmt" ) func main() { sig :=3D make(chan os.Signal) signal.Notify(sig, os.Kill, os.Interrupt) mod :=3D bpflib.NewModule("/tmp/sched.o") fmt.Println("loading ebpf module") err :=3D mod.Load(nil) if err !=3D nil { panic(err) } err =3D mod.EnableKprobes(50) if err !=3D nil { panic(err) } fmt.Println("loaded ebpf module") rxChan :=3D make(chan []byte) lostChan :=3D make(chan uint64) pmap, err :=3D bpflib.InitPerfMap( mod, "sched", rxChan, lostChan, ) if err !=3D nil { panic(err) } go func() { for { select { case pe :=3D <-rxChan: fmt.Println(pe) case l :=3D <-lostChan: fmt.Println(l) } } }() pmap.PollStart() fmt.Println("listening on ebpf map") <-sig } The main thread hangs right after the call to module constructor. On Tue, Oct 9, 2018 at 10:40 PM Rich Felker wrote: > On Tue, Oct 09, 2018 at 10:36:41PM +0200, Szabolcs Nagy wrote: > > * Rabbitstack [2018-10-09 21:37:06 +0200]: > > > Should we raise an issue in Go upstream repository since there is > nothing > > > actionable from musl side? > > > > > > > have you figured out where the siprocmask came from? > > it might not be the go runtime but some c lib that you linked in. > > Well the sigset_t was created in Go code or via some other code that > bypasses libc. The libc functions cannot create a sigset_t with the > implementation-internal signals masked. > > > > El vie., 5 oct. 2018 2:47, Rich Felker escribi=C3= =B3: > > > > > > > > > > Here is the bug: > > > > > > > > > > 6208 rt_sigprocmask(SIG_SETMASK, ~[HUP INT QUIT ILL TRAP ABRT BU= S > FPE > > > > SEGV TERM STKFLT CHLD PROF SYS RTMIN RT_1], > > > > the go runtime should not make this call, it probably comes from > > somewhere else. > > > > i think you should try to create a minimal reproducer go code > > that makes this syscall. > > I looked at the Go implementations of the functions for sigset_t > manipulation and sigprocmask. They all bypass libc. So either it's an > error to use them at all in programs that link with libc, or a bug in > Go that they don't respect SIGRTMIN, etc. > > Rich > --000000000000fe04600577f56f76 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi

I managed to reproduce th= e problem with minimal code snippet and can confirm it's definitely the= Go stdlib signal handler that messes things up. Here's the code:
= 

package main

import (

   bpflib =
"github.com/iovisor/gobpf/elf"
   "os/signal=
"
   &qu=
ot;os"
 =
  "fmt"
)

func main() {
   sig :=3D make(chan os.Signal)
   signal.Notify(=
sig, os.Kill, os.Interrupt)

   mod :=3D bpflib.NewModule("/tmp/sched.o")   fmt.Println("=
loading ebpf module")
   err :=3D mod.Load(nil)
   if err !=3D nil {
 =
     panic(err)
   }
   err =3D mod.EnableKprobes(50)
   if err !=3D nil {
      panic(err)
   }
   fmt.Pr=
intln("loaded ebpf=
 module")
   rxChan :=3D make(chan []byte)
   lostChan :=3D make(chan uint64)

   p=
map, err :=3D bpflib.InitPerfMap(
      mod,
      "sched",
      rxChan=
,
      lostChan,
   )

   if err !=3D nil {
      panic(err)
   }
   go func() {<=
br>      for {         select {
         case pe :=3D <-rxChan:
            fmt.Println(pe)
         case l :=3D <-lostC=
han:
            fmt.Println(l)
         }
      }
   }()
  =
 pmap.PollStart()
   fmt.Println("listening on ebpf map")
   <-sig
}<=
br>
The main thread hangs=
 right after the call to module constructor.

On Tue, Oct 9, 2018 at 10:40 PM Rich= Felker <dalias@libc.org> wrot= e:
On Tue, Oct 09, 2018 at 10:36:41= PM +0200, Szabolcs Nagy wrote:
> * Rabbitstack <rabbitstack7@gmail.com> [2018-10-09 21:37:06 +0200]:
> >=C2=A0 Should we raise an issue in Go upstream repository since th= ere is nothing
> > actionable from musl side?
> >
>
> have you figured out where the siprocmask came from?
> it might not be the go runtime but some c lib that you linked in.

Well the sigset_t was created in Go code or via some other code that
bypasses libc. The libc functions cannot create a sigset_t with the
implementation-internal signals masked.

> > El vie., 5 oct. 2018 2:47, Rich Felker <dalias@libc.org> escribi=C3=B3:
> > > >
> > > > Here is the bug:
> > > >
> > > > 6208=C2=A0 rt_sigprocmask(SIG_SETMASK, ~[HUP INT QUIT I= LL TRAP ABRT BUS FPE
> > > SEGV TERM STKFLT CHLD PROF SYS RTMIN RT_1],=C2=A0 <unfini= shed ...>
>
> the go runtime should not make this call, it probably comes from
> somewhere else.
>
> i think you should try to create a minimal reproducer go code
> that makes this syscall.

I looked at the Go implementations of the functions for sigset_t
manipulation and sigprocmask. They all bypass libc. So either it's an error to use them at all in programs that link with libc, or a bug in
Go that they don't respect SIGRTMIN, etc.

Rich
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