libthread_xu and getaddrinfo problem

[Johannes Hofmann <Johannes.Hofmann@xxxxxx>]

After reading the thread on kernel I switched from libc_r to libthread_xu.
Now I have sporadic problems with a program that creates a thread to call
getaddrinfo(3). From time to time I get EAI_NODATA even though the address
is resolvable. It seems to be some timing issue as additional printfs make
the problem go away.
Below is a ktrace output that shows a problematic getaddrinfo() call. I
wonder if 
40645:27   dillo-fltk RET   kevent -1 errno 9 Bad file descriptor
is ok?

Cheers,
Johannes



40645 dillo-fltk CALL  lwp_create(0xbfbfd1b0)
40645:0    dillo-fltk RET   lwp_create 0
40645:0    dillo-fltk CALL  sigprocmask(SIG_SETMASK,0xbfbfd190,0)
40645:0    dillo-fltk RET   sigprocmask 0
40645:0    dillo-fltk CALL  mmap(0,0x3000,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,0xffffffff,0,0,0)
40645:0    dillo-fltk RET   mmap 677752832/0x2865b000
40645:0    dillo-fltk CALL  close(0x4)
40645:27   dillo-fltk RET   fork 0
40645:0    dillo-fltk RET   close 0
40645:27   dillo-fltk CALL  set_tls_area(0,0xbf6fbfdc,0x8)
40645:27   dillo-fltk RET   set_tls_area 123/0x7b
40645:27   dillo-fltk CALL  sigprocmask(SIG_SETMASK,0x28685d74,0)
40645:27   dillo-fltk RET   sigprocmask 0
40645:27   dillo-fltk CALL  open(0x2843b727,O_RDONLY,<unused>0x1b6)
40645:27   dillo-fltk NAMI  "/etc/hosts"
40645:27   dillo-fltk RET   open 4
40645:27   dillo-fltk CALL  fstat(0x4,0xbf6f9cbc)
40645:27   dillo-fltk RET   fstat 0
40645:27   dillo-fltk CALL  read(0x4,0x28771000,0x2000)
40645:27   dillo-fltk GIO   fd 4 read 1792 bytes
       "# $FreeBSD: src/etc/hosts,v 1.11.2.4 2003/02/06 20:36:58 dbaker "
40645:27   dillo-fltk RET   read 1792/0x700
40645:27   dillo-fltk CALL  read(0x4,0x28771000,0x2000)
40645:27   dillo-fltk GIO   fd 4 read 0 bytes
       ""
40645:27   dillo-fltk RET   read 0
40645:27   dillo-fltk CALL  close(0x4)
40645:27   dillo-fltk RET   close 0
40645:27   dillo-fltk CALL  mmap(0,0x10000,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,0xffffffff,0,0,0)
40645:27   dillo-fltk RET   mmap 686235648/0x28e72000
40645:27   dillo-fltk CALL  mmap(0,0x10000,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,0xffffffff,0,0,0)
40645:27   dillo-fltk RET   mmap 686563328/0x28ec2000
40645:27   dillo-fltk CALL  mmap(0,0x10000,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,0xffffffff,0,0,0)
40645:27   dillo-fltk RET   mmap 689078272/0x29128000
40645:27   dillo-fltk CALL  kqueue
40645:27   dillo-fltk RET   kqueue 4
40645:27   dillo-fltk CALL  socket(PF_INET,SOCK_DGRAM,0)
40645:27   dillo-fltk RET   socket 5
40645:0    dillo-fltk CALL  munmap(0x28888000,0x3000)
40645:0    dillo-fltk RET   munmap 0
40645:0    dillo-fltk CALL  munmap(0x288c7000,0x3000)
40645:0    dillo-fltk RET   munmap 0
40645:0    dillo-fltk CALL  close(0x4)
40645:0    dillo-fltk RET   close 0
40645:0    dillo-fltk CALL  munmap(0x288ca000,0x3000)
40645:0    dillo-fltk RET   munmap 0
40645:0    dillo-fltk CALL  gettimeofday(0xbfbff4c0,0)
40645:0    dillo-fltk RET   gettimeofday 0
40645:0    dillo-fltk CALL  write(0x3,0x28542000,0xda8)
40645:0    dillo-fltk GIO   fd 3 wrote 3496 bytes
       ";\^C\^E\0\^N\0@\^A\0\0\0\0\^B\0\^B\0\^\\0\^X\0\M^\\^F\^E\0Ä\^D@\^A\0\0\0\0\^B\0\^B\0\^\\0\^X\0\
        8\0\^D\0\^N\0@\^A\^D\0\0\0iii\0B\0\a\0\^C\0@\^A"
40645:0    dillo-fltk RET   write 3496/0xda8
40645:27   dillo-fltk CALL  connect(0x5,0x28456a30,0x10)
40645:27   dillo-fltk RET   connect 0
40645:0    dillo-fltk CALL  gettimeofday(0xbfbff4c0,0)
40645:0    dillo-fltk RET   gettimeofday 0
40645:0    dillo-fltk CALL  select(0x4,0xbfbff504,0xbfbff584,0xbfbff604,0xbfbff684)
40645:27   dillo-fltk CALL  sendto(0x5,0x29128000,0x2c,0,0,0)
40645:27   dillo-fltk GIO   fd 5 wrote 44 bytes
       "8f\^A\0\0\^A\0\0\0\0\0\0\bpartners\rwebmasterplan\^Ccom\0\0\^A\0\^A"
40645:27   dillo-fltk RET   sendto 44/0x2c
40645:27   dillo-fltk CALL  gettimeofday(0xbf6fb64c,0)
40645:27   dillo-fltk RET   gettimeofday 0
40645:27   dillo-fltk CALL  kevent(0x4,0xbf6fb68c,0x1,0xbf6fb68c,0x1,0xbf6fb654)
40645:27   dillo-fltk RET   kevent -1 errno 9 Bad file descriptor
40645:27   dillo-fltk CALL  close(0x5)
40645:27   dillo-fltk RET   close 0
40645:27   dillo-fltk CALL  socket(PF_INET,SOCK_DGRAM,0)
40645:27   dillo-fltk RET   socket 4
40645:27   dillo-fltk CALL  connect(0x4,0x28456a30,0x10)
40645:27   dillo-fltk RET   connect 0
40645:27   dillo-fltk CALL  sendto(0x4,0x29128000,0x2c,0,0,0)
40645:27   dillo-fltk GIO   fd 4 wrote 44 bytes
       "8f\^A\0\0\^A\0\0\0\0\0\0\bpartners\rwebmasterplan\^Ccom\0\0\^A\0\^A"
40645:27   dillo-fltk RET   sendto 44/0x2c
40645:27   dillo-fltk CALL  gettimeofday(0xbf6fb64c,0)
40645:27   dillo-fltk RET   gettimeofday 0
40645:27   dillo-fltk CALL  kevent(0x4,0xbf6fb68c,0x1,0xbf6fb68c,0x1,0xbf6fb654)
40645:27   dillo-fltk RET   kevent -1 errno 9 Bad file descriptor
40645:27   dillo-fltk CALL  close(0x4)
40645:27   dillo-fltk RET   close 0
40645:27   dillo-fltk CALL  socket(PF_INET,SOCK_DGRAM,0)
40645:27   dillo-fltk RET   socket 4
40645:27   dillo-fltk CALL  connect(0x4,0x28456a30,0x10)
40645:27   dillo-fltk RET   connect 0
40645:27   dillo-fltk CALL  sendto(0x4,0x29128000,0x2c,0,0,0)
40645:27   dillo-fltk GIO   fd 4 wrote 44 bytes
       "8f\^A\0\0\^A\0\0\0\0\0\0\bpartners\rwebmasterplan\^Ccom\0\0\^A\0\^A"
40645:27   dillo-fltk RET   sendto 44/0x2c
40645:27   dillo-fltk CALL  gettimeofday(0xbf6fb64c,0)
40645:27   dillo-fltk RET   gettimeofday 0
40645:27   dillo-fltk CALL  kevent(0x4,0xbf6fb68c,0x1,0xbf6fb68c,0x1,0xbf6fb654)
40645:27   dillo-fltk RET   kevent -1 errno 9 Bad file descriptor
40645:27   dillo-fltk CALL  close(0x4)
40645:27   dillo-fltk RET   close 0
40645:27   dillo-fltk CALL  socket(PF_INET,SOCK_DGRAM,0)
40645:27   dillo-fltk RET   socket 4
40645:27   dillo-fltk CALL  connect(0x4,0x28456a30,0x10)
40645:27   dillo-fltk RET   connect 0
40645:27   dillo-fltk CALL  sendto(0x4,0x29128000,0x2c,0,0,0)
40645:27   dillo-fltk GIO   fd 4 wrote 44 bytes
       "8f\^A\0\0\^A\0\0\0\0\0\0\bpartners\rwebmasterplan\^Ccom\0\0\^A\0\^A"
40645:27   dillo-fltk RET   sendto 44/0x2c
40645:27   dillo-fltk CALL  gettimeofday(0xbf6fb64c,0)
40645:27   dillo-fltk RET   gettimeofday 0
40645:27   dillo-fltk CALL  kevent(0x4,0xbf6fb68c,0x1,0xbf6fb68c,0x1,0xbf6fb654)
40645:27   dillo-fltk RET   kevent -1 errno 9 Bad file descriptor
40645:27   dillo-fltk CALL  close(0x4)
40645:27   dillo-fltk RET   close 0
40645:27   dillo-fltk CALL  close(0x4)
40645:27   dillo-fltk RET   close -1 errno 9 Bad file descriptor
40645:27   dillo-fltk CALL  munmap(0x29128000,0x10000)
40645:27   dillo-fltk RET   munmap 0
40645:27   dillo-fltk CALL  mmap(0,0x10000,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANON,0xffffffff,0,0,0)
40645:27   dillo-fltk RET   mmap 689078272/0x29128000
40645:27   dillo-fltk CALL  kqueue
40645:27   dillo-fltk RET   kqueue 4
40645:27   dillo-fltk CALL  socket(PF_INET,SOCK_DGRAM,0)
40645:27   dillo-fltk RET   socket 5
40645:27   dillo-fltk CALL  connect(0x5,0x28456a30,0x10)
40645:27   dillo-fltk RET   connect 0
40645:27   dillo-fltk CALL  sendto(0x5,0x29128000,0x30,0,0,0)
40645:27   dillo-fltk GIO   fd 5 wrote 48 bytes
       "8g\^A\0\0\^A\0\0\0\0\0\0\bpartners\rwebmasterplan\^Ccom\^Clan\0\0\^A\0\^A"
40645:27   dillo-fltk RET   sendto 48/0x30
40645:27   dillo-fltk CALL  gettimeofday(0xbf6fb64c,0)
40645:27   dillo-fltk RET   gettimeofday 0
40645:27   dillo-fltk CALL  kevent(0x4,0xbf6fb68c,0x1,0xbf6fb68c,0x1,0xbf6fb654)
40645:27   dillo-fltk RET   kevent 1
40645:27   dillo-fltk CALL  recvfrom(0x5,0x28e72000,0x10000,0,0xbf6fb6ac,0xbf6fb648)
40645:27   dillo-fltk GIO   fd 5 read 48 bytes
       "8g\M^A\M^C\0\^A\0\0\0\0\0\0\bpartners\rwebmasterplan\^Ccom\^Clan\0\0\^A\0\^A"
40645:27   dillo-fltk RET   recvfrom 48/0x30
40645:27   dillo-fltk CALL  close(0x5)
40645:27   dillo-fltk RET   close 0
40645:27   dillo-fltk CALL  close(0x4)
40645:27   dillo-fltk RET   close 0
40645:27   dillo-fltk CALL  munmap(0x29128000,0x10000)
40645:27   dillo-fltk RET   munmap 0
40645:27   dillo-fltk CALL  munmap(0x28e72000,0x10000)
40645:27   dillo-fltk RET   munmap 0
40645:27   dillo-fltk CALL  munmap(0x28ec2000,0x10000)
40645:27   dillo-fltk RET   munmap 0
40645:27   dillo-fltk CALL  write(0x1,0x28537000,0x16)
40645:27   dillo-fltk GIO   fd 1 wrote 22 bytes
       "DNS error: NO_ADDRESS
       "
40645:27   dillo-fltk RET   write 22/0x16
40645:27   dillo-fltk CALL  write(0x1,0x28537000,0x32)
40645:27   dillo-fltk GIO   fd 1 wrote 50 bytes
       "Dns_server [0]: partners.webmasterplan.com is 0x0
       "