[Dovecot] stale imap processes with 1.0.rc6 on FreeBSD

[Jeremy C. Reed]

> > There are many more "imap" processes without any network connection 
> > though.
> 
> These are the important processes then. What do ktrace and gdb
> backtraces show for them?

Okay, here is one that no longer has an network connection:

(gdb) bt full
#0  0x2811d590 in ?? ()
No symbol table info available.
#1  0x80a9230 in ?? ()
No symbol table info available.
#2  0x80a8915 in ?? ()
No symbol table info available.
#3  0x806104d in _fini ()
No symbol table info available.
#4  0x8055ac9 in i_stream_create_file (fd=-1077937284, pool=0x0, 
    max_buffer_size=3217030017, autoclose_fd=-1077937263) at 
istream-file.c:236
        pool = 0x0
        max_buffer_size = 135102512
        fstream = (struct file_istream *) 0x80ca560
        st = {st_dev = 3217029756, st_ino = 3217029664, st_mode = 4159, 
  st_nlink = 2054, st_uid = 3217029740, st_gid = 671912909, 
  st_rdev = 3217029740, st_atimespec = {tv_sec = 134568649, tv_nsec = 1}, 
  st_mtimespec = {tv_sec = -1077937548, tv_nsec = -1077937540}, 
  st_ctimespec = {tv_sec = 647, tv_nsec = -1077937556}, 
  st_size = 577967886526927274, st_blocks = 134943496, st_blksize = 0, 
  st_flags = 0, st_gen = 3217029736, st_lspare = 0, st_qspare = {
    -4629706567330037760, 2885872453060393580}}

Nothing for ktrace though. With ktracing enabled, next time doing gdb did 
add details (but maybe not related):

 99399 imap     PSIG  SIGINT caught handler=0x80a92ec mask=0x0 code=0x0
 99399 imap     RET   kevent -1 errno 4 Interrupted system call
 99399 imap     CALL  write(0x6,0xbfbff7a3,0x1)
 99399 imap     GIO   fd 6 wrote 1 byte
       "\^B"
 99399 imap     RET   write 1
 99399 imap     CALL  sigreturn(0xbfbff7c0)
 99399 imap     RET   sigreturn JUSTRETURN
 99399 imap     CALL  write(0x2,0x80cb1e0,0x2b)
 99399 imap     GIO   fd 2 wrote 43 bytes
       "\^AFkevent() failed: Interrupted system call
       "
 99399 imap     RET   write 43/0x2b
 99399 imap     CALL  sigprocmask(0x1,0x280d9be0,0xbfbff8a0)
 99399 imap     RET   sigprocmask 0
 99399 imap     CALL  sigprocmask(0x3,0x280d9bf0,0)
 99399 imap     RET   sigprocmask 0
 99399 imap     CALL  exit(0x59)


> Can you see if file descriptors still exist for the sockets? In Linux
> I'd do that with ls -l /proc/pid/fd/

Yes, they do. fstat shows the "internet stream tcp" for them with file 
descriptor 0 and 1. The ones that still have a network connection also 
display the address of the socket, like:

USER     CMD          PID   FD MOUNT      INUM MODE         SZ|DV R/W
user     imap        4711    0* internet stream tcp d5fcd640
user     imap        4711    1* internet stream tcp d5fcd640
user     imap       99399    0* internet stream tcp
user     imap       99399    1* internet stream tcp