Hi,

I'm running -current (not latest, only GENERIC.MP#20), see dmesg below.

I run in a error in tmux (a long session: 10 days for now), when a want to 
create a new window (C-b C-c), I have this error:

 Create window failed: exec ksh: Too many open files

Note, my default shell in tmux.conf is "exec ksh" (see ~/.tmux.conf below)


My limit for open files are standard:
semarie@bert:~$ ulimit -n
512


Currently, I have only 4 windows in this sessions, but:

semarie@bert:~$ fstat -u semarie | grep tmux
semarie  tmux        3941   wd /home     4053504 drwx------   r     2560
semarie  tmux        3941    0 /           17084 crw--w----  rw    ttyp5
semarie  tmux        3941    1 /           17084 crw--w----  rw    ttyp5
semarie  tmux        3941    2 /           17084 crw--w----  rw    ttyp5
semarie  tmux        3941    3 kqueue 0xd8c0f3d4 0 state: W
semarie  tmux        3941    4 /home     4053890 -rw-r--r--   r     1859
semarie  tmux        3941    5* unix stream 0xd31c7680 <-> 0xd4105380
semarie  tmux        1509   wd /home     4053504 drwx------   r     2560
semarie  tmux        1509    0 /           17621 crw-rw-rw-  rw     null
semarie  tmux        1509    1 /           17621 crw-rw-rw-  rw     null
semarie  tmux        1509    2 /           17621 crw-rw-rw-  rw     null
semarie  tmux        1509    3 kqueue 0xd8c0f310 0 state: W
semarie  tmux        1509    4 /home     4053942 -rw-r--r--   r     1805
semarie  tmux        1509    5* unix stream 0xd4105380 <-> 0xd31c7680
semarie  tmux        1509    6* unix stream 0xd3228740
semarie  tmux        1509    7 /           17084 crw--w----  rw    ttyp5
semarie  tmux        1509    9 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509   10 /           17079 crw-rw-rw-  rw    ptyp2
semarie  tmux        1509   11 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509   12 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509   13 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509   14 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509   15 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509   16 /           17621 crw-rw-rw-   r     null
[...]
semarie  tmux        1509  503 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509  504 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509  505 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509  506 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509  507 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509  508 /           17621 crw-rw-rw-   r     null
semarie  tmux        1509  509 /           17618 crw-rw-rw-   r      tty
semarie  tmux        1509  510 /           17618 crw-rw-rw-   r      tty

There are 510 descriptors opened... 

Any hints ?

Does tmux could not closed not-need descriptors for old created windows ?

It will try too keep this session running for debug if need...

I could also upgrade to latest snapshot if needed. But I don't show any commit 
to tmux that seems related to that. But I could be wrong: please let me know.

Thanks.
-- 
Sebastien Marie

My ~/.tmux.conf

set -g default-command "exec ksh"
set -g status-right "#(sysctl -n vm.loadavg)"

# Statusbar properties.
set -g display-time 3000
set -g status-bg black
set -g status-fg cyan
set-window-option -g window-status-current-attr bright,reverse
set-window-option -g window-status-current-bg cyan
set-window-option -g window-status-current-fg black 

# divers
set -g default-path ""
set -g bell-action any 
set -g set-titles on
set -g base-index 1
set -g history-limit 5000
set -g update-environment "DISPLAY WINDOWID SSH_ASKPASS SSH_AUTH_SOCK 
SSH_AGENT_PID SSH_CONNECTION DBUS_SESSION_BUS_ADDRESS XDG_SESSION_COOKIE 
KRB5CCNAME"


My dmesg:

OpenBSD 5.2-current (GENERIC.MP) #20: Tue Sep 11 11:54:03 MDT 2012
    dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC.MP
cpu0: Genuine Intel(R) CPU T2400 @ 1.83GHz ("GenuineIntel" 686-class) 1.83 GHz
cpu0: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,NXE,SSE3,MWAIT,VMX,EST,TM2,xTPR,PDCM
real mem  = 2137399296 (2038MB)
avail mem = 2091552768 (1994MB)
mainbus0 at root
bios0 at mainbus0: AT/286+ BIOS, date 03/09/06, BIOS32 rev. 0 @ 0xffa10, SMBIOS 
rev. 2.4 @ 0xf7b70 (44 entries)
bios0: vendor Dell Inc. version "A03" date 03/09/2006
bios0: Dell Inc. MM061
acpi0 at bios0: rev 0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC MCFG BOOT SSDT
acpi0: wakeup devices LID_(S3) PBTN(S4) PCI0(S3) USB0(S0) USB1(S0) USB2(S0) 
USB3(S0) EHCI(S0) CH31(S0) AZAL(S3) PCIE(S4) RP01(S4) RP02(S3) RP03(S3) 
RP04(S3) RP05(S3) RP06(S3)
acpitimer0 at acpi0: 3579545 Hz, 24 bits
acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
cpu0 at mainbus0: apid 0 (boot processor)
cpu0: apic clock running at 166MHz
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Genuine Intel(R) CPU T2400 @ 1.83GHz ("GenuineIntel" 686-class) 1.83 GHz
cpu1: 
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,NXE,SSE3,MWAIT,VMX,EST,TM2,xTPR,PDCM
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 0, remapped to apid 2
acpimcfg0 at acpi0 addr 0xe0000000, bus 0-63
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus -1 (AGP_)
acpiprt2 at acpi0: bus 3 (PCIE)
acpiprt3 at acpi0: bus 11 (RP01)
acpiprt4 at acpi0: bus -1 (RP02)
acpiprt5 at acpi0: bus -1 (RP03)
acpiprt6 at acpi0: bus 12 (RP04)
acpiprt7 at acpi0: bus -1 (RP05)
acpiprt8 at acpi0: bus -1 (RP06)
acpicpu0 at acpi0: C3, C2, C1, PSS
acpicpu1 at acpi0: C3, C2, C1, PSS
acpitz0 at acpi0: critical temperature is 126 degC
acpiac0 at acpi0: AC unit online
acpibat0 at acpi0: BAT0 model " DELLUD2649" serial 878 type LION oem "Sanyo"
acpibtn0 at acpi0: LID_
acpibtn1 at acpi0: PBTN
acpibtn2 at acpi0: SBTN
acpivideo0 at acpi0: VID_
acpivideo1 at acpi0: VID_
acpivideo2 at acpi0: VID2
bios0: ROM list: 0xc0000/0xe800! 0xce800/0x1800
cpu0: Enhanced SpeedStep 1829 MHz: speeds: 1833, 1333, 1000 MHz
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82945GM Host" rev 0x03
vga1 at pci0 dev 2 function 0 "Intel 82945GM Video" rev 0x03
wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
intagp0 at vga1
agp0 at intagp0: aperture at 0xc0000000, size 0x10000000
inteldrm0 at vga1: apic 2 int 16
drm0 at inteldrm0
"Intel 82945GM Video" rev 0x03 at pci0 dev 2 function 1 not configured
azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x01: msi
azalia0: codecs: Sigmatel STAC9200, Conexant/0x2bfa, using Sigmatel STAC9200
audio0 at azalia0
ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x01: apic 2 int 16
pci1 at ppb0 bus 11
wpi0 at pci1 dev 0 function 0 "Intel PRO/Wireless 3945ABG" rev 0x02: msi, MoW2, 
address 00:13:02:2e:8b:46
ppb1 at pci0 dev 28 function 3 "Intel 82801GB PCIE" rev 0x01: apic 2 int 19
pci2 at ppb1 bus 12
uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x01: apic 2 int 20
uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x01: apic 2 int 21
uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x01: apic 2 int 22
uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x01: apic 2 int 23
ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x01: apic 2 int 20
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb2 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe1
pci3 at ppb2 bus 3
bce0 at pci3 dev 0 function 0 "Broadcom BCM4401B1" rev 0x02: apic 2 int 17, 
address 00:15:c5:0b:8b:7a
bmtphy0 at bce0 phy 1: BCM4401 10/100baseTX PHY, rev. 0
"Ricoh 5C832 Firewire" rev 0x00 at pci3 dev 1 function 0 not configured
sdhc0 at pci3 dev 1 function 1 "Ricoh 5C822 SD/MMC" rev 0x19: apic 2 int 18
sdmmc0 at sdhc0
"Ricoh 5C843 MMC" rev 0x01 at pci3 dev 1 function 2 not configured
"Ricoh 5C592 Memory Stick" rev 0x0a at pci3 dev 1 function 3 not configured
"Ricoh 5C852 xD" rev 0x05 at pci3 dev 1 function 4 not configured
ichpcib0 at pci0 dev 31 function 0 "Intel 82801GBM LPC" rev 0x01: PM disabled
pciide0 at pci0 dev 31 function 2 "Intel 82801GBM SATA" rev 0x01: DMA, channel 
0 wired to compatibility, channel 1 wired to compatibility
wd0 at pciide0 channel 0 drive 0: <Hitachi HTS541616J9SA00>
wd0: 16-sector PIO, LBA48, 152627MB, 312581808 sectors
wd0(pciide0:0:0): using PIO mode 4, Ultra-DMA mode 5
atapiscsi0 at pciide0 channel 1 drive 0
scsibus0 at atapiscsi0: 2 targets
cd0 at scsibus0 targ 0 lun 0: <_NEC, DVD+-RW ND-6650A, 102C> ATAPI 5/cdrom 
removable
cd0(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 2
ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x01: apic 2 int 17
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 1GB DDR2 SDRAM non-parity PC2-5300CL5 SO-DIMM
spdmem1 at iic0 addr 0x52: 1GB DDR2 SDRAM non-parity PC2-5300CL5 SO-DIMM
usb1 at uhci0: USB revision 1.0
uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb2 at uhci1: USB revision 1.0
uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb3 at uhci2: USB revision 1.0
uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1
usb4 at uhci3: USB revision 1.0
uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1
isa0 at ichpcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
pckbc0: using irq 12 for aux slot
wsmouse0 at pms0 mux 0
pms0: Synaptics touchpad, firmware 6.2
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
mtrr: Pentium Pro MTRR support
vscsi0 at root
scsibus1 at vscsi0: 256 targets
softraid0 at root
scsibus2 at softraid0: 256 targets
root on wd0a (3ed108d2b4f1280b.a) swap on wd0b dump on wd0b
sd0 at scsibus2 targ 1 lun 0: <OPENBSD, SR CRYPTO, 005> SCSI2 0/direct fixed
sd0: 51200MB, 512 bytes/sector, 104857680 sectors

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