NetBSD Problem Report #51323

From silasdb@gmail.com  Thu Jul  7 19:39:55 2016
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Message-Id: <577eb008.855e370a.47699.3996@mx.google.com>
Date: Thu, 07 Jul 2016 16:37:43 -0300
From: silasdb@gmail.com
Reply-To: silasdb@gmail.com
To: gnats-bugs@NetBSD.org
Subject: ping6 -c sends a SIGINT to itself
X-Send-Pr-Version: 3.95

>Number:         51323
>Category:       bin
>Synopsis:       ping6 -c sends a SIGINT to itself
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jul 07 19:40:00 +0000 2016
>Last-Modified:  Fri Jul 08 00:20:01 +0000 2016
>Originator:     Silas Silva
>Release:        NetBSD 7.0
>Organization:

>Environment:
System: NetBSD auron 7.0 NetBSD 7.0 (GENERIC.201509250726Z) amd64
Architecture: x86_64
Machine: amd64
>Description:
	When using -c option of ping6, it sends a SIGINT to itself, breaking
	shell scripts with monitor option (job control) enabled because of
	process group semantics.  Shells would just expect a simple non-zero
	exit status.  For more information see kre@ explanation:
	http://mail-index.netbsd.org/netbsd-users/2016/07/06/msg018667.html
>How-To-Repeat:
	ping6 -c 1 fe80::a800:ff:fe13:942f
>Fix:

>Audit-Trail:
From: christos@zoulas.com (Christos Zoulas)
To: gnats-bugs@NetBSD.org, gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Cc: 
Subject: Re: bin/51323: ping6 -c sends a SIGINT to itself
Date: Thu, 7 Jul 2016 16:58:08 -0400

 On Jul 7,  7:40pm, silasdb@gmail.com (silasdb@gmail.com) wrote:
 -- Subject: bin/51323: ping6 -c sends a SIGINT to itself

 I don't think this is true. Become root and ktrace it. It seems to be
 getting a SIGALRM (on -7)... Nevertheless the code does not use SIGALRM
 anymore, and we could pull the fixes up...

 christos

From: Silas Silva <silasdb@gmail.com>
To: gnats-bugs@NetBSD.org
Cc: gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Subject: Re: bin/51323: ping6 -c sends a SIGINT to itself
Date: Thu, 7 Jul 2016 20:28:24 -0300

 On Thu, Jul 07, 2016 at 09:00:01PM +0000, Christos Zoulas wrote:
 >  I don't think this is true. Become root and ktrace it. It seems to be
 >  getting a SIGALRM (on -7)... Nevertheless the code does not use SIGALRM
 >  anymore, and we could pull the fixes up...

 This is the kdump ktrace.out output (also, it may be worth to mention
 that exit code is 130):

   5666      1 ktrace   EMUL  "netbsd"
   5666      1 ktrace   CALL  execve(0x7f7fffffd2f0,0x7f7fffffd7d8,0x7f7ffff=
 fd800)
   5666      1 ktrace   NAMI  "/home/silas/bin/ping6"
   5666      1 ktrace   RET   execve -1 errno 2 No such file or directory
   5666      1 ktrace   CALL  execve(0x7f7fffffd2f0,0x7f7fffffd7d8,0x7f7ffff=
 fd800)
   5666      1 ktrace   NAMI  "/home/silas/scripts/bin/ping6"
   5666      1 ktrace   RET   execve -1 errno 2 No such file or directory
   5666      1 ktrace   CALL  execve(0x7f7fffffd2f0,0x7f7fffffd7d8,0x7f7ffff=
 fd800)
   5666      1 ktrace   NAMI  "/bin/ping6"
   5666      1 ktrace   RET   execve -1 errno 2 No such file or directory
   5666      1 ktrace   CALL  execve(0x7f7fffffd2f0,0x7f7fffffd7d8,0x7f7ffff=
 fd800)
   5666      1 ktrace   NAMI  "/sbin/ping6"
   5666      1 ktrace   NAMI  "/libexec/ld.elf_so"
   5666      1 ping6    EMUL  "netbsd"
   5666      1 ping6    RET   execve JUSTRETURN
   5666      1 ping6    CALL  mmap(0,0x8000,3,0x1002,0xffffffff,0,0)
   5666      1 ping6    RET   mmap 140187598290944/0x7f7ff7ff8000
   5666      1 ping6    CALL  open(0x7f7ff7c0d2c0,0,0x7f7ff7e11ef0)
   5666      1 ping6    NAMI  "/etc/ld.so.conf"
   5666      1 ping6    RET   open -1 errno 2 No such file or directory
   5666      1 ping6    CALL  open(0x7f7fffffd030,0,0x636573706962696c)
   5666      1 ping6    NAMI  "/lib/libipsec.so.3"
   5666      1 ping6    RET   open 3
   5666      1 ping6    CALL  __fstat50(3,0x7f7fffffcf48)
   5666      1 ping6    RET   __fstat50 0
   5666      1 ping6    CALL  mmap(0,0x1000,1,1,3,0,0)
   5666      1 ping6    RET   mmap 140187598286848/0x7f7ff7ff7000
   5666      1 ping6    CALL  munmap(0x7f7ff7ff7000,0x1000)
   5666      1 ping6    RET   munmap 0
   5666      1 ping6    CALL  mmap(0,0x20f000,5,0x15000002,3,0,0)
   5666      1 ping6    RET   mmap 140187589935104/0x7f7ff7800000
   5666      1 ping6    CALL  mmap(0x7f7ff7a0d000,0x1000,3,0x12,3,0,0xd000)
   5666      1 ping6    RET   mmap 140187592085504/0x7f7ff7a0d000
   5666      1 ping6    CALL  mmap(0x7f7ff7a0e000,0x1000,3,0x1012,0xffffffff=
 ,0,0)
   5666      1 ping6    RET   mmap 140187592089600/0x7f7ff7a0e000
   5666      1 ping6    CALL  mprotect(0x7f7ff780e000,0x1ff000,0)
   5666      1 ping6    RET   mprotect 0
   5666      1 ping6    CALL  close(3)
   5666      1 ping6    RET   close 0
   5666      1 ping6    CALL  open(0x7f7fffffd030,0,0x2e6f732e6d62696c)
   5666      1 ping6    NAMI  "/lib/libm.so.0"
   5666      1 ping6    RET   open 3
   5666      1 ping6    CALL  __fstat50(3,0x7f7fffffcf48)
   5666      1 ping6    RET   __fstat50 0
   5666      1 ping6    CALL  mmap(0,0x1000,1,1,3,0,0)
   5666      1 ping6    RET   mmap 140187598286848/0x7f7ff7ff7000
   5666      1 ping6    CALL  munmap(0x7f7ff7ff7000,0x1000)
   5666      1 ping6    RET   munmap 0
   5666      1 ping6    CALL  mmap(0,0x227000,5,0x15000002,3,0,0)
   5666      1 ping6    RET   mmap 140187585740800/0x7f7ff7400000
   5666      1 ping6    CALL  mmap(0x7f7ff7626000,0x1000,3,0x12,3,0,0x26000)
   5666      1 ping6    RET   mmap 140187587993600/0x7f7ff7626000
   5666      1 ping6    CALL  mmap(0x7f7ff7627000,0,3,0x1012,0xffffffff,0,0)
   5666      1 ping6    RET   mmap 140187587997696/0x7f7ff7627000
   5666      1 ping6    CALL  mprotect(0x7f7ff7426000,0x200000,0)
   5666      1 ping6    RET   mprotect 0
   5666      1 ping6    CALL  close(3)
   5666      1 ping6    RET   close 0
   5666      1 ping6    CALL  open(0x7f7fffffd030,0,0x67)
   5666      1 ping6    NAMI  "/lib/libgcc_s.so.1"
   5666      1 ping6    RET   open 3
   5666      1 ping6    CALL  __fstat50(3,0x7f7fffffcf48)
   5666      1 ping6    RET   __fstat50 0
   5666      1 ping6    CALL  mmap(0,0x1000,1,1,3,0,0)
   5666      1 ping6    RET   mmap 140187598286848/0x7f7ff7ff7000
   5666      1 ping6    CALL  munmap(0x7f7ff7ff7000,0x1000)
   5666      1 ping6    RET   munmap 0
   5666      1 ping6    CALL  mmap(0,0x20c000,5,0x15000002,3,0,0)
   5666      1 ping6    RET   mmap 140187581546496/0x7f7ff7000000
   5666      1 ping6    CALL  mmap(0x7f7ff720b000,0x1000,3,0x12,3,0,0xb000)
   5666      1 ping6    RET   mmap 140187583688704/0x7f7ff720b000
   5666      1 ping6    CALL  mmap(0x7f7ff720c000,0,3,0x1012,0xffffffff,0,0)
   5666      1 ping6    RET   mmap 140187583692800/0x7f7ff720c000
   5666      1 ping6    CALL  mprotect(0x7f7ff700c000,0x1ff000,0)
   5666      1 ping6    RET   mprotect 0
   5666      1 ping6    CALL  close(3)
   5666      1 ping6    RET   close 0
   5666      1 ping6    CALL  open(0x7f7fffffd030,0,0x2e6f732e6362696c)
   5666      1 ping6    NAMI  "/lib/libc.so.12"
   5666      1 ping6    RET   open 3
   5666      1 ping6    CALL  __fstat50(3,0x7f7fffffcf48)
   5666      1 ping6    RET   __fstat50 0
   5666      1 ping6    CALL  mmap(0,0x1000,1,1,3,0,0)
   5666      1 ping6    RET   mmap 140187598286848/0x7f7ff7ff7000
   5666      1 ping6    CALL  munmap(0x7f7ff7ff7000,0x1000)
   5666      1 ping6    RET   munmap 0
   5666      1 ping6    CALL  mmap(0,0x36e000,5,0x15000002,3,0,0)
   5666      1 ping6    RET   mmap 140187577352192/0x7f7ff6c00000
   5666      1 ping6    CALL  mmap(0x7f7ff6f4f000,0xc000,3,0x12,3,0,0x14f000)
   5666      1 ping6    RET   mmap 140187580821504/0x7f7ff6f4f000
   5666      1 ping6    CALL  mmap(0x7f7ff6f5b000,0x13000,3,0x1012,0xfffffff=
 f,0,0)
   5666      1 ping6    RET   mmap 140187580870656/0x7f7ff6f5b000
   5666      1 ping6    CALL  mprotect(0x7f7ff6d4f000,0x200000,0)
   5666      1 ping6    RET   mprotect 0
   5666      1 ping6    CALL  close(3)
   5666      1 ping6    RET   close 0
   5666      1 ping6    CALL  _lwp_setprivate(0x7f7ff7ffe1c0)
   5666      1 ping6    RET   _lwp_setprivate 0
   5666      1 ping6    CALL  _lwp_self
   5666      1 ping6    RET   _lwp_self 1
   5666      1 ping6    CALL  __sigprocmask14(1,0x7f7fffffd700,0x7f7fffffd77=
 0)
   5666      1 ping6    RET   __sigprocmask14 0
   5666      1 ping6    CALL  __sigprocmask14(3,0x7f7fffffd770,0)
   5666      1 ping6    RET   __sigprocmask14 0
   5666      1 ping6    CALL  __sysctl(0x7f7ff6d217e0,2,0x608760,0x7f7fffffd=
 6b8,0,0)
   5666      1 ping6    RET   __sysctl 0
   5666      1 ping6    CALL  _lwp_self
   5666      1 ping6    RET   _lwp_self 1
   5666      1 ping6    CALL  __sigprocmask14(1,0x7f7fffffd6c0,0x7f7fffffd77=
 0)
   5666      1 ping6    RET   __sigprocmask14 0
   5666      1 ping6    CALL  __sigprocmask14(3,0x7f7fffffd770,0)
   5666      1 ping6    RET   __sigprocmask14 0
   5666      1 ping6    CALL  _lwp_self
   5666      1 ping6    RET   _lwp_self 1
   5666      1 ping6    CALL  __sigprocmask14(1,0x7f7fffffd6c0,0x7f7fffffd77=
 0)
   5666      1 ping6    RET   __sigprocmask14 0
   5666      1 ping6    CALL  __sigprocmask14(3,0x7f7fffffd770,0)
   5666      1 ping6    RET   __sigprocmask14 0
   5666      1 ping6    CALL  _lwp_self
   5666      1 ping6    RET   _lwp_self 1
   5666      1 ping6    CALL  __sigprocmask14(1,0x7f7fffffd6c0,0x7f7fffffd77=
 0)
   5666      1 ping6    RET   __sigprocmask14 0
   5666      1 ping6    CALL  __sigprocmask14(3,0x7f7fffffd770,0)
   5666      1 ping6    RET   __sigprocmask14 0
   5666      1 ping6    CALL  _lwp_self
   5666      1 ping6    RET   _lwp_self 1
   5666      1 ping6    CALL  __sigprocmask14(1,0x7f7fffffd6c0,0x7f7fffffd77=
 0)
   5666      1 ping6    RET   __sigprocmask14 0
   5666      1 ping6    CALL  __sigprocmask14(3,0x7f7fffffd770,0)
   5666      1 ping6    RET   __sigprocmask14 0
   5666      1 ping6    CALL  __sysctl(0x7f7fffffc5e0,2,0x7f7ff6f63fe8,0x7f7=
 fffffc5f0,0,0)
   5666      1 ping6    RET   __sysctl 0
   5666      1 ping6    CALL  __sysctl(0x7f7fffffc520,2,0x7f7ff6f6d208,0x7f7=
 fffffc528,0,0)
   5666      1 ping6    RET   __sysctl 0
   5666      1 ping6    CALL  readlink(0x7f7ff6d1a803,0x7f7fffffc620,0x400)
   5666      1 ping6    NAMI  "/etc/malloc.conf"
   5666      1 ping6    RET   readlink -1 errno 2 No such file or directory
   5666      1 ping6    CALL  mmap(0,0x1000,3,0x1002,0xffffffff,0,0)
   5666      1 ping6    RET   mmap 140187598286848/0x7f7ff7ff7000
   5666      1 ping6    CALL  mmap(0,0x1000,3,0x1002,0xffffffff,0,0)
   5666      1 ping6    RET   mmap 140187598282752/0x7f7ff7ff6000
   5666      1 ping6    CALL  mmap(0,0x100000,3,0x14001002,0xffffffff,0,0)
   5666      1 ping6    RET   mmap 140187593080832/0x7f7ff7b00000
   5666      1 ping6    CALL  __socket30(0x18,3,0x3a)
   5666      1 ping6    RET   __socket30 3
   5666      1 ping6    CALL  getuid
   5666      1 ping6    RET   getuid 0
   5666      1 ping6    CALL  seteuid(0)
   5666      1 ping6    RET   seteuid 0
   5666      1 ping6    CALL  getuid
   5666      1 ping6    RET   getuid 0
   5666      1 ping6    CALL  setuid(0)
   5666      1 ping6    RET   setuid 0
   5666      1 ping6    CALL  mmap(0,0x1000,3,0x1000,0xffffffff,0,0)
   5666      1 ping6    RET   mmap 140187598278656/0x7f7ff7ff5000
   5666      1 ping6    CALL  minherit(0x7f7ff7ff5000,0x1000,4)
   5666      1 ping6    RET   minherit 0
   5666      1 ping6    CALL  __sysctl(0x7f7fffffcbe0,2,0x7f7fffffcbf0,0x7f7=
 fffffcbe8,0,0)
   5666      1 ping6    RET   __sysctl 0
   5666      1 ping6    CALL  setsockopt(3,0x29,0x2a,0x7f7fffffce28,4)
   5666      1 ping6    RET   setsockopt 0
   5666      1 ping6    CALL  setsockopt(3,0x3a,0x12,0x7f7fffffced0,0x20)
   5666      1 ping6    RET   setsockopt 0
   5666      1 ping6    CALL  __socket30(0x18,2,0)
   5666      1 ping6    RET   __socket30 4
   5666      1 ping6    CALL  connect(4,0x628cb0,0x1c)
   5666      1 ping6    MISC  mbsoname: [=C2=8Ej=C3=80=C3=B7=7F=7F]
   5666      1 ping6    RET   connect 0
   5666      1 ping6    CALL  getsockname(4,0x628cb0,0x7f7fffffced0)
   5666      1 ping6    MISC  mbsoname: [fe80::1%lo0]
   5666      1 ping6    RET   getsockname 0
   5666      1 ping6    CALL  close(4)
   5666      1 ping6    RET   close 0
   5666      1 ping6    CALL  setsockopt(3,0xffff,0x1002,0x7f7fffffce24,4)
   5666      1 ping6    RET   setsockopt 0
   5666      1 ping6    CALL  setsockopt(3,0x29,0x24,0x7f7fffffce28,4)
   5666      1 ping6    RET   setsockopt 0
   5666      1 ping6    CALL  setsockopt(3,0x29,0x25,0x7f7fffffce28,4)
   5666      1 ping6    RET   setsockopt 0
   5666      1 ping6    CALL  __fstat50(1,0x7f7fffffc270)
   5666      1 ping6    RET   __fstat50 0
   5666      1 ping6    CALL  ioctl(1,TIOCGETA,0x7f7fffffc2e0)
   5666      1 ping6    GIO   fd 1 read 44 bytes
        "\^B)\0\0\^C\0\0\0\0K\0\0\M-O\^E\0 \^D\M^?\0\b\^W\^U\^R\M^?\^C\^\\^Z=
 \^Y\^Q\^S\^V\
 	\^O\^A\0\^T\M^?\0\M^V\0\0\0\M^V\0\0"
   5666      1 ping6    RET   ioctl 0
   5666      1 ping6    CALL  __sysctl(0x7f7ff6d1e7d0,6,0,0x7f7fffffb5d8,0,0)
   5666      1 ping6    RET   __sysctl 0
   5666      1 ping6    CALL  __sysctl(0x7f7ff6d1e7d0,6,0x7f7ff7b0d800,0x7f7=
 fffffb5d8,0,0)
   5666      1 ping6    RET   __sysctl 0
   5666      1 ping6    CALL  write(1,0x7f7ff7b0c000,0x3f)
   5666      1 ping6    GIO   fd 1 wrote 63 bytes
        "PING6(56=3D40+8+8 bytes) fe80::1%lo0 --> fe80::a800:ff:fe13:942f\n"
   5666      1 ping6    RET   write 63/0x3f
   5666      1 ping6    CALL  __sigaction_sigtramp(SIGINT,0x7f7fffffcd30,0x7=
 f7fffffcd50,0x7f7ff6c9f3f0,2)
   5666      1 ping6    RET   __sigaction_sigtramp 0
   5666      1 ping6    CALL  __sigaction_sigtramp(SIGINFO,0x7f7fffffcd30,0x=
 7f7fffffcd50,0x7f7ff6c9f3f0,2)
   5666      1 ping6    RET   __sigaction_sigtramp 0
   5666      1 ping6    CALL  __sigaction_sigtramp(SIGALRM,0x7f7fffffcd30,0x=
 7f7fffffcd50,0x7f7ff6c9f3f0,2)
   5666      1 ping6    RET   __sigaction_sigtramp 0
   5666      1 ping6    CALL  __setitimer50(0,0x7f7fffffce60,0)
   5666      1 ping6    RET   __setitimer50 0
   5666      1 ping6    CALL  __gettimeofday50(0x7f7fffffcd10,0)
   5666      1 ping6    RET   __gettimeofday50 0
   5666      1 ping6    CALL  sendmsg(3,0x608c00,0)
   5666      1 ping6    MISC  msghdr: [name=3D0x628cd0, namelen=3D28, iov=3D=
 0x7f7fffffcd10, iovlen=3D1, control=3D0x0, controllen=3D0, flags=3D4000000]
   5666      1 ping6    MISC  mbsoname: [fe80::a800:ff:fe13:942f]
   5666      1 ping6    GIO   fd 3 wrote 16 bytes
        "\M^@\0\0\0\M-#\M-]\0\0W~\M-d \0\a\M^HS"
   5666      1 ping6    RET   sendmsg 16/0x10
   5666      1 ping6    CALL  poll(0x7f7fffffce30,1,0xffffffff)
   5666      1 ping6    RET   poll -1 errno 4 Interrupted system call
   5666      1 ping6    PSIG  SIGALRM caught handler=3D0x4024a7 mask=3D(): c=
 ode=3DSI_TIMER sent by pid=3D0, uid=3D0 with sigval 0x0)
   5666      1 ping6    CALL  setcontext(0x7f7fffffc9e0)
   5666      1 ping6    RET   setcontext JUSTRETURN
   5666      1 ping6    CALL  __sigaction_sigtramp(SIGALRM,0x7f7fffffcd00,0x=
 7f7fffffcd20,0x7f7ff6c9f3f0,2)
   5666      1 ping6    RET   __sigaction_sigtramp 0
   5666      1 ping6    CALL  __setitimer50(0,0x7f7fffffcd50,0)
   5666      1 ping6    RET   __setitimer50 0
   5666      1 ping6    CALL  poll(0x7f7fffffce30,1,0xffffffff)
   5666      1 ping6    RET   poll -1 errno 4 Interrupted system call
   5666      1 ping6    PSIG  SIGALRM caught handler=3D0x4029e8 mask=3D(): c=
 ode=3DSI_TIMER sent by pid=3D0, uid=3D0 with sigval 0x0)
   5666      1 ping6    CALL  write(1,0x7f7ff7b0c000,1)
   5666      1 ping6    GIO   fd 1 wrote 1 bytes
        "\n"
   5666      1 ping6    RET   write 1
   5666      1 ping6    CALL  write(1,0x7f7ff7b0c000,0x31)
   5666      1 ping6    GIO   fd 1 wrote 49 bytes
        "--- fe80::a800:ff:fe13:942f ping6 statistics ---\n"
   5666      1 ping6    RET   write 49/0x31
   5666      1 ping6    CALL  write(1,0x7f7ff7b0c000,0x3e)
   5666      1 ping6    GIO   fd 1 wrote 62 bytes
        "1 packets transmitted, 0 packets received, 100.0% packet loss\n"
   5666      1 ping6    RET   write 62/0x3e
   5666      1 ping6    CALL  __sigaction_sigtramp(SIGINT,0x7f7fffffc900,0x7=
 f7fffffc920,0x7f7ff6c9f3f0,2)
   5666      1 ping6    RET   __sigaction_sigtramp 0
   5666      1 ping6    CALL  getpid
   5666      1 ping6    RET   getpid 5666/0x1622, 2182/0x886
   5666      1 ping6    CALL  kill(0x1622, SIGINT)
   5666      1 ping6    RET   kill 0
   5666      1 ping6    PSIG  SIGINT SIG_DFL: code=3DSI_USER sent by pid=3D5=
 666, uid=3D0)

 --=20
 Silas

From: Robert Elz <kre@munnari.OZ.AU>
To: christos@zoulas.com (Christos Zoulas)
Cc: gnats-bugs@NetBSD.org, gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Subject: Re: bin/51323: ping6 -c sends a SIGINT to itself
Date: Fri, 08 Jul 2016 07:08:16 +0700

     Date:        Thu, 7 Jul 2016 16:58:08 -0400
     From:        christos@zoulas.com (Christos Zoulas)
     Message-ID:  <20160707205808.2D26217FDAB@rebar.astron.com>

   | I don't think this is true. Become root and ktrace it. It seems to be
   | getting a SIGALRM (on -7)... Nevertheless the code does not use SIGALRM
   | anymore, and we could pull the fixes up...

 It is fixed in current, but not in NetBSD 7 (where the problem occurred).

 kre

From: christos@zoulas.com (Christos Zoulas)
To: Silas Silva <silasdb@gmail.com>, gnats-bugs@NetBSD.org
Cc: gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Subject: Re: bin/51323: ping6 -c sends a SIGINT to itself
Date: Thu, 7 Jul 2016 20:15:17 -0400

 On Jul 7,  8:28pm, silasdb@gmail.com (Silas Silva) wrote:
 -- Subject: Re: bin/51323: ping6 -c sends a SIGINT to itself

 | On Thu, Jul 07, 2016 at 09:00:01PM +0000, Christos Zoulas wrote:
 | >  I don't think this is true. Become root and ktrace it. It seems to be
 | >  getting a SIGALRM (on -7)... Nevertheless the code does not use SIGALRM
 | >  anymore, and we could pull the fixes up...
 | 
 | This is the kdump ktrace.out output (also, it may be worth to mention
 | that exit code is 130):

 Yes, indeed this version kills itself with SIGINT, argh 7.0 is so old...
 I fixed it a while ago.

 christos

 revision 1.84
 date: 2014-09-16 17:29:12 -0400;  author: christos;  state: Exp;  lines: +11 -10;  commitid: DLegappGTp9ZfCQx;
 PR/49206: ping6 dies with SIGINT even when it just fails to ping
 When reusing the same handler for SIGALRM, make don't pretend you
 got SIGINT.

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