dhclient fails: can't open and lock /var/db/dhclient.leases.wlan0: Bad file descriptor

[Hans Petter Selasky]

On 02/10/17 15:10, Konstantin Belousov wrote:
> On Fri, Feb 10, 2017 at 05:29:54AM -0800, David Wolfskill wrote:
>> This was head @r313544; previous successful build/smoke test was
>> @r313467 (yesterday).
>>
>> Here's an excerpt from a typescript I made of some "poking around";
>> subsequent to that, I was able to set the IP address, netmask, and
>> broadcast address on the NIC (wlano), then set the default route, and
>> once that was done, I was able to use the network:
>>
>> wlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>>         ether 00:24:d6:7a:03:ce
>>         inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255
>>         nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
>>         media: IEEE 802.11 Wireless Ethernet MCS mode 11ng
>>         status: associated
>>         ssid lmdhw-net channel 1 (2412 MHz 11g ht/20) bssid 04:18:d6:22:22:1f
>>         regdomain FCC country US authmode WPA2/802.11i privacy ON
>>         deftxkey UNDEF AES-CCM 2:128-bit txpower 30 bmiss 10 scanvalid 60
>>         protmode CTS ampdulimit 64k ampdudensity 8 -amsdutx amsdurx shortgi
>>         -stbc -ldpc wme roaming MANUAL
>>         groups: wlan
>> (12.0-C)[4] pgrep dhclient
>> (12.0-C)[5] dhclient wlan0
>> dhclient: /etc/dhclient-enter-hooks invoked with reason PREINIT
>> dhclient: Leaving hostname set to
>> dhclient: /etc/dhclient-exit-hooks invoked with reason PREINIT
>> dhclient: reason was PREINIT; no action taken
>> dhclient: Exiting /etc/dhclient-exit-hooks (PREINIT) with exit_status 0
>> can't open and lock /var/db/dhclient.leases.wlan0: Bad file descriptor
>> exiting.
>> (12.0-C)[6] ls -lTio /var/db/dhclient.leases*
>> 883105 ----------  1 root  wheel  - 4017 Jan  4 09:18:10 2017 /var/db/dhclient.leases.em0
>> 883280 ----------  1 root  wheel  -  856 Aug 11 04:52:54 2015 /var/db/dhclient.leases.lagg0
>> 883344 ----------  1 root  wheel  - 3333 Jan 20 21:19:10 2015 /var/db/dhclient.leases.vboxnet0
>> 883108 ----------  1 root  wheel  - 1993 Feb 10 04:30:13 2017 /var/db/dhclient.leases.wlan0
>> 883079 ----------  1 root  wheel  - 2013 Jan 19 11:52:07 2017 /var/db/dhclient.leases.wlan1
>>
>>
>> Moving /var/db/dhclient.leases.wlan0 aside did not change the behavior.
>>
>> Stable/11 shows the iwn(4) device as:
>> g1-252(11.0-S)[4] pciconf -lv | grep -A 3 iwn
>> iwn0 at pci0:3:0:0:        class=0x028000 card=0x13218086 chip=0x42328086 rev=0x00 hdr=0x00
>>     vendor     = 'Intel Corporation'
>>     device     = 'WiFi Link 5100'
>>     class      = network
>> g1-252(11.0-S)[5]
>>
>> File system for /var is a fairly vanilla UFS2+SU.  I suppose I could have
>> tried ktrace (had I thought of it before switching back to the stable/11
>> slice).
>>
>

Hi Konstantin,

I hit the exact same issue with some rack servers and can confirm the 
patch below fixes this issue.

--HPS

> Please try this.
>
> diff --git a/sys/kern/vfs_vnops.c b/sys/kern/vfs_vnops.c
> index 70cdcdc6f75..1f2cceaf7a6 100644
> --- a/sys/kern/vfs_vnops.c
> +++ b/sys/kern/vfs_vnops.c
> @@ -351,8 +351,8 @@ vn_open_vnode(struct vnode *vp, int fmode, struct ucred *cred,
>
>  	while ((fmode & (O_EXLOCK | O_SHLOCK)) != 0) {
>  		KASSERT(fp != NULL, ("open with flock requires fp"));
> -		if (fp->f_type != DTYPE_VNODE) {
> -			error = EBADF;
> +		if (fp->f_type != DTYPE_NONE && fp->f_type != DTYPE_VNODE) {
> +			error = EOPNOTSUPP;
>  			break;
>  		}
>  		lock_flags = VOP_ISLOCKED(vp);
> diff --git a/sys/sys/file.h b/sys/sys/file.h
> index 353c92f365a..c51f26a41d2 100644
> --- a/sys/sys/file.h
> +++ b/sys/sys/file.h
> @@ -53,6 +53,7 @@ struct vnode;
>
>  #endif /* _KERNEL */
>
> +#define	DTYPE_NONE	0	/* not yet initialized */
>  #define	DTYPE_VNODE	1	/* file */
>  #define	DTYPE_SOCKET	2	/* communications endpoint */
>  #define	DTYPE_PIPE	3	/* pipe */
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