Re: kern/49065 (ifconfig tun0 ... sequence locks up system)

[Mindaugas Rasiukevicius <rmind%netbsd.org@localhost>]

Frank Kardel <kardel%netbsd.org@localhost> wrote:
>  Now mdnsd is stuck at:
>  db> bt/a dac148e0
>  trace: pid 786 lid 1 at 0xd9f89b54
>  0xd9f89b54: netbsd:mi_switch+0xc
>  0xd9f89b84: netbsd:sleepq_block+0xa4
>  0xd9f89bbc: netbsd:cv_wait+0x114
>  0xd9f89be4: netbsd:usbd_transfer+0x1e8
>  0xd9f89c1c: netbsd:usbd_do_request_flags_pipe+0xd0
>  0xd9f89c44: netbsd:usbd_do_request+0x38
>  0xd9f89c74: netbsd:smsc_write_reg+0x60
>  0xd9f89ca4: netbsd:smsc_ioctl+0x110
>  0xd9f89d4c: netbsd:if_mcast_op+0x50
>  0xd9f89d9c: netbsd:in6_addmulti+0x1a8
>  0xd9f89dc4: netbsd:in6_joingroup+0x44
>  0xd9f89e4c: netbsd:ip6_ctloutput+0x137c
>  0xd9f89e74: netbsd:udp6_ctloutput+0x9c
>  0xd9f89ed4: netbsd:sosetopt+0x6c
>  0xd9f89f0c: netbsd:sys_setsockopt+0x84
>  0xd9f89f7c: netbsd:syscall+0x8c
>  0xd9f89fac: netbsd:swi_handler+0x98
>  db>

Nick is your friend here.  The driver should not really block for a
long time with softnet_lock held.

-- 
Mindaugas