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kernel dump in dev_change_flags

To: linux-mips@linux-mips.org
Subject: kernel dump in dev_change_flags
From: krispa <krishnapavan@gmail.com>
Date: Thu, 13 Nov 2008 03:26:55 -0800 (PST)
Original-recipient: rfc822;linux-mips@linux-mips.org
Sender: linux-mips-bounce@linux-mips.org
Hello all

I am porting a virtual interface driver from 2.4 to 2.6 .

i was able to create a virtual interface successfully
using ioctl command i was able to create the interface. and was able to set
various parameters of
the interface , but when i try to bring up the interface i get the following
dump.

i tried locking using rtnl_lock and spin_lock_irqsave ...during that time
the system got hung ...
as of now i am using spin_lock for the critical region and get the following
dump.
can any one please suggest me how do i go about to resolve the issue.


Jan  1 00:02:57 localhost kernel: BUG: soft lockup detected on CPU#1!
Jan  1 00:02:57 localhost kernel: Call Trace:
Jan  1 00:02:57 localhost kernel: [<ffffffff81123570>] dump_stack+0x8/0x48
Jan  1 00:02:57 localhost kernel: [<ffffffff81187864>]
softlockup_tick+0x1c4/0x238
Jan  1 00:02:57 localhost kernel: [<ffffffff8115d6ac>]
update_process_times+0x44/0x98
Jan  1 00:02:57 localhost kernel: [<ffffffff81101644>]
octeon_main_timer_interrupt+0x194/0x1a0
Jan  1 00:02:57 localhost kernel: [<ffffffff81187fa0>]
handle_IRQ_event+0xf0/0x490
Jan  1 00:02:57 localhost kernel: [<ffffffff8118a430>]
handle_percpu_irq+0x98/0x118
Jan  1 00:02:57 localhost kernel: [<ffffffff81105550>]
plat_irq_dispatch+0x100/0x270
Jan  1 00:02:57 localhost kernel: [<ffffffff8111c3c0>] ret_from_irq+0x0/0x4
Jan  1 00:02:57 localhost kernel: [<ffffffff8143febc>] _spin_lock+0x6c/0xc0
Jan  1 00:02:57 localhost kernel: [<c0000000000b0cbc>] vif_open+0x84/0x3e8
[cavium_vidd]
Jan  1 00:02:57 localhost kernel: [<ffffffff81385b50>] dev_open+0x68/0xd8
Jan  1 00:02:57 localhost kernel: [<ffffffff813817cc>]
dev_change_flags+0x144/0x188
Jan  1 00:02:57 localhost kernel: [<c0000000000af774>]
vif_devinet_ioctl+0x2fc/0x8b8 [cavium_vidd]
Jan  1 00:02:57 localhost kernel: [<c0000000000aeb94>]
VIDD_ioctl+0x824/0xf70 [cavium_vidd]
Jan  1 00:02:57 localhost kernel: [<ffffffff813848e0>] dev_ioctl+0x320/0x560
Jan  1 00:02:57 localhost kernel: [<ffffffff8137221c>]
sock_ioctl+0x1bc/0x3f8
Jan  1 00:02:57 localhost kernel: [<ffffffff811cfbe0>] do_ioctl+0x40/0xd0
Jan  1 00:02:57 localhost kernel: [<ffffffff811cfcf0>] vfs_ioctl+0x80/0x3e8
Jan  1 00:02:57 localhost kernel: [<ffffffff811d012c>] sys_ioctl+0xd4/0x1b8
Jan  1 00:02:57 localhost kernel: [<ffffffff811277b4>]
syscall_trace_entry+0x78/0x98
Jan  1 00:02:57 localhost kernel:


-Thanks in advance
Krishna 
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