[Digikam-devel] [Bug 243497] Digikam does not exit when "quit", stuck in select

[Chris Samuel]

https://bugs.kde.org/show_bug.cgi?id=243497





--- Comment #1 from Chris Samuel <kde csamuel org>  2010-07-03 15:34:31 ---
It appears to be trying to read from a UNIX domain socket, but getting no
answer.

chris at quad:~$ strace -p 9914
Process 9914 attached - interrupt to quit                                       
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 966567}) = 0 (Timeout)                                                      
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)                                                                    
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998707}) = 0 (Timeout)                                                      
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)                                                                    
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998794}) = 0 (Timeout)                                                      
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)                                                                    
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998785}) = 0 (Timeout)                                                      
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)                                                                    
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998792}) = 0 (Timeout)                                                      
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)                                                                    
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998791}) = 0 (Timeout)                                                      
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)                                                                    
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998782}) = 0 (Timeout)                                                      
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)                                                                    
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998790}) = 0 (Timeout)                                                      
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)                                                                    
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998790}) = 0 (Timeout)                                                      
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)                                                                    
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998786}) = 0 (Timeout)                                                      
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998996}) = 0 (Timeout)
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998783}) = 0 (Timeout)
read(7, 0x2693ba4, 4096)                = -1 EAGAIN (Resource temporarily
unavailable)
select(76, [3 7 8 9 12 42 43 54 55 58 59 60 61 69 70 71 72 73 74 75], [], [],
{0, 998799}^C <unfinished ...>

chris at quad:~$ ls -l /proc/9914/fd/7
lrwx------ 1 chris chris 64 2010-07-03 23:22 /proc/9914/fd/7 -> socket:[321098]

chris at quad:~$ sudo netstat -np | fgrep 321098
unix  3      [ ]         STREAM     CONNECTED     321098   9914/digikam

chris at quad:~$ sudo lsof | fgrep 321098
digikam    9914      chris    7u     unix 0xffff8801e18e8c00       0t0   321098
socket

Running an strace on digikam from the start for calls to connect(), socket(),
open() and select() reveals that the socket for file descriptor 7 appears to be
connected to the X server:

10212 socket(PF_FILE, SOCK_STREAM, 0)   = 7
10212 connect(7, {sa_family=AF_FILE, path=@"/tmp/.X11-unix/X0"}, 20) = 0

That's about my limit for ideas on digging into what's going on here - any
ideas ?

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