thr3ads.net - dovecot - [Dovecot] File descriptor leak in 1.0rc2[45]? [Mar 2007]

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Victor Duchovni

2007-Mar-05 20:51 UTC

[Dovecot] File descriptor leak in 1.0rc2[45]?

I upgraded (NetBSD 2.99 i386) from 1.0rc7 to 1.0rc24 and then tried rc25,
and in both cases need to restart Dovecot every day or so (low volume server).
It seems to run out of file descriptors. I have now raised the file descriptor
limit to 1024, but that is not a long-term solution...

    ...
    Mar  5 11:41:38 arioch dovecot: pipe() failed: Too many open files
    Mar  5 11:42:38 arioch dovecot: pipe() failed: Too many open files
    Mar  5 11:43:38 arioch dovecot: pipe() failed: Too many open files
    Mar  5 11:44:38 arioch dovecot: pipe() failed: Too many open files
    Mar  5 11:46:38 arioch dovecot: pipe() failed: Too many open files
    Mar  5 11:47:38 arioch dovecot: pipe() failed: Too many open files
    Mar  5 11:48:38 arioch dovecot: pipe() failed: Too many open files
    Mar  5 11:49:38 arioch dovecot: pipe() failed: Too many open files
    Mar  5 11:50:38 arioch dovecot: pipe() failed: Too many open files
    ...

lsof(1) output for dovecot-auth and dovecot:

COMMAND     PID USER   FD     TYPE     DEVICE SIZE/OFF    NODE NAME
dovecot-a 22627 root  cwd     VDIR        0,6      512  405514 /var/run/dovecot
dovecot-a 22627 root  txt     VREG        0,5   175256 1083551 /usr (/dev/wd0f)
dovecot-a 22627 root  txt     VREG        0,5     7399  101747
/usr/lib/libcom_err.so.4.1
dovecot-a 22627 root  txt     VREG        0,0  1083908   67635
/lib/libcrypto.so.2.1
dovecot-a 22627 root  txt     VREG        0,0   866469   67587
/lib/libc.so.12.125
dovecot-a 22627 root  txt     VREG        0,0    24557   67605
/lib/libcrypt.so.0.2
dovecot-a 22627 root  txt     VREG        0,5    52783  101743
/usr/lib/libroken.so.12.3
dovecot-a 22627 root  txt     VREG        0,5    41436  101739
/usr/lib/libdes.so.7.0
dovecot-a 22627 root  txt     VREG        0,5   145345  101759
/usr/lib/libasn1.so.6.1
dovecot-a 22627 root  txt     VREG        0,5   251589  102046
/usr/lib/libkrb5.so.19.1
dovecot-a 22627 root  txt     VREG        0,5    66856  101775
/usr/lib/libgssapi.so.5.0
dovecot-a 22627 root  txt     VREG        0,0    56172  101377
/libexec/ld.elf_so
dovecot-a 22627 root    0u    unix 0xc0f773c4      0t0         ->0xc115a144
dovecot-a 22627 root    1r    VCHR        2,2      0t0   45067 /dev/null
dovecot-a 22627 root    2w    PIPE 0xcb000e10        0         ->0xcb000d80
dovecot-a 22627 root    3u    unix 0xc0f9fbe4      0t0        
/var/run/dovecot/login/default
dovecot-a 22627 root    4u  KQUEUE 0xc0f11c30                  
dovecot-a 22627 root    5r    VCHR       46,1      0t4   45571 /dev/urandom
dovecot-a 22627 root    6r    PIPE 0xcb0006c0    16384         ->0xcc08b2d0
dovecot-a 22627 root    7w    PIPE 0xcc08b2d0        0         ->0xcb0006c0
dovecot-a 22627 root   12r    VCHR       46,1   0t1024   45571 /dev/urandom

----------

COMMAND  PID USER   FD     TYPE     DEVICE SIZE/OFF    NODE NAME
dovecot 5161 root  cwd     VDIR        0,6      512  405514 /var/run/dovecot
dovecot 5161 root  txt     VREG        0,5   119872 1109297 /usr (/dev/wd0f)
dovecot 5161 root  txt     VREG        0,0   866469   67587 /lib/libc.so.12.125
dovecot 5161 root  txt     VREG        0,0    56172  101377 /libexec/ld.elf_so
dovecot 5161 root    0r    VCHR        2,2      0t0   45067 /dev/null
dovecot 5161 root    1r    VCHR        2,2      0t0   45067 /dev/null
dovecot 5161 root    2r    VCHR        2,2      0t0   45067 /dev/null
dovecot 5161 root    3r    VCHR        2,2      0t0   45067 /dev/null
dovecot 5161 root    4r    VCHR        2,2      0t0   45067 /dev/null
dovecot 5161 root    5u    IPv4 0xc0f13500      0t0     TCP *:imap (LISTEN)
dovecot 5161 root    6u  KQUEUE 0xc0f11410                  
dovecot 5161 root    7u    unix 0xc0d3cd80      0t0         ->0xc0d3c0d8
dovecot 5161 root    8r    PIPE 0xcb000a20    16384         ->0xcb000cf0
dovecot 5161 root    9w    PIPE 0xcb000cf0        0         ->0xcb000a20
dovecot 5161 root   10u    unix 0xc0f15bd4      0t0        
/var/run/dovecot/dict-server
dovecot 5161 root   11u    unix 0xc0f9fbe4      0t0        
/var/run/dovecot/login/default
dovecot 5161 root   12u    unix 0xc115a144      0t0         ->0xc0f773c4
dovecot 5161 root   14r    PIPE 0xcb000900    16384         
dovecot 5161 root   16r    PIPE 0xcb000d80    16384         ->0xcb000e10
dovecot 5161 root   17r    PIPE 0xcd4a7994    16384         
dovecot 5161 root   18r    PIPE 0xcd4a7bd4    16384         
dovecot 5161 root   19r    PIPE 0xcd659634    16384         
dovecot 5161 root   20r    PIPE 0xcb000870    16384         
dovecot 5161 root   21r    PIPE 0xcd4a7c64    16384         
dovecot 5161 root   22r    PIPE 0xcd4a7cf4    16384         
dovecot 5161 root   23r    PIPE 0xce11dac4    16384         
dovecot 5161 root   24r    PIPE 0xce11d914    16384         
dovecot 5161 root   25r    PIPE 0xcd4a71b4    16384         
dovecot 5161 root   26r    PIPE 0xce11d644    16384         
dovecot 5161 root   27r    PIPE 0xcd6592d4    16384         
dovecot 5161 root   28r    PIPE 0xcd659094    16384         
dovecot 5161 root   29r    PIPE 0xcd659874    16384         
dovecot 5161 root   30r    PIPE 0xcb000990    16384         
dovecot 5161 root   31r    PIPE 0xce11d374    16384         
dovecot 5161 root   32r    PIPE 0xce11d254    16384         
dovecot 5161 root   33r    PIPE 0xce11d764    16384         
dovecot 5161 root   34r    PIPE 0xcd4a72d4    16384         
dovecot 5161 root   35r    PIPE 0xce11de24    16384         
dovecot 5161 root   36r    PIPE 0xce11d404    16384         
dovecot 5161 root   37r    PIPE 0xce11d9a4    16384         
dovecot 5161 root   38r    PIPE 0xcd659754    16384         
dovecot 5161 root   39r    PIPE 0xcd659c64    16384         
dovecot 5161 root   40r    PIPE 0xcc08b5a0    16384         
dovecot 5161 root   41r    PIPE 0xcc08b870    16384         
dovecot 5161 root   42r    PIPE 0xcc08b360    16384         
dovecot 5161 root   43r    PIPE 0xcc08bc60    16384         
dovecot 5161 root   44r    PIPE 0xcc08bab0    16384         
dovecot 5161 root   45r    PIPE 0xcc08b000    16384         
dovecot 5161 root   46r    PIPE 0xcc08b120    16384         
dovecot 5161 root   47r    PIPE 0xcc08b6c0    16384         
dovecot 5161 root   48r    PIPE 0xcc08b990    16384         
dovecot 5161 root   49u    unix 0xc0f77214      0t0        
/var/run/dovecot/auth-worker.22627
dovecot 5161 root   50r    PIPE 0xcc08b630    16384         
dovecot 5161 root   51r    PIPE 0xcc08b240    16384         
dovecot 5161 root   52r    PIPE 0xcc08bbd0    16384         
dovecot 5161 root   53r    PIPE 0xcc08b750    16384         
dovecot 5161 root   54r    PIPE 0xcc08b900    16384         
dovecot 5161 root   55r    PIPE 0xcc08bb40    16384         
dovecot 5161 root   56r    PIPE 0xcccd5018    16384         
dovecot 5161 root   57r    PIPE 0xcc08b1b0    16384         
dovecot 5161 root   58r    PIPE 0xcccd5528    16384         
dovecot 5161 root   59r    PIPE 0xcccd52e8    16384         
dovecot 5161 root   60r    PIPE 0xcd659514    16384         
dovecot 5161 root   61r    PIPE 0xcccd5138    16384         
dovecot 5161 root   62r    PIPE 0xcccd59a8    16384         

-- 
	Viktor.

Timo Sirainen

2007-Mar-06 13:20 UTC

head link

[Dovecot] File descriptor leak in 1.0rc2[45]?

On Mon, 2007-03-05 at 15:51 -0500, Victor Duchovni
wrote:> 
> I upgraded (NetBSD 2.99 i386) from 1.0rc7 to 1.0rc24 and then tried
> rc25,
> and in both cases need to restart Dovecot every day or so (low volume
> server).
> It seems to run out of file descriptors. I have now raised the file
> descriptor
> limit to 1024, but that is not a long-term solution... 
I guess you built with kqueue code? It seems to be buggy with older
NetBSDs.

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Victor Duchovni

2007-Mar-06 13:49 UTC

head link

[Dovecot] File descriptor leak in 1.0rc2[45]?

On Tue, Mar 06, 2007 at 03:20:26PM +0200, Timo Sirainen wrote:
> On Mon, 2007-03-05 at 15:51 -0500, Victor Duchovni wrote:
> > 
> > I upgraded (NetBSD 2.99 i386) from 1.0rc7 to 1.0rc24 and then tried
> > rc25,
> > and in both cases need to restart Dovecot every day or so (low volume
> > server).
> > It seems to run out of file descriptors. I have now raised the file
> > descriptor
> > limit to 1024, but that is not a long-term solution... 
> 
> I guess you built with kqueue code?
I used the pkgsrc defaults. It looks like this uses kqueue. I am puzzled
why kqueue introduces descriptor leaks.
> It seems to be buggy with older NetBSDs.
Is "it" the kqueue code in the kernel (how does this lead to
descriptor
leaks) or the kqueue-using event code in Dovecot (how does this lead
to descriptor leaks).

What can I do to work around the issue?

-- 
	Viktor.

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