netdev - Re: Kernel panic from tg3 net driver

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Date:	Thu, 20 Oct 2011 22:30:44 +0300
From:	Ari Savolainen <ari.m.savolainen@...il.com>
To:	"David S. Miller" <davem@...emloft.net>,
	Richard Cochran <richardcochran@...il.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Kernel panic from tg3 net driver

I finally got time to continue bisecting. The commit that causes the
kernel panic is:  2669069aacc9 "tg3: enable transmit time stamping."

Ari

2011/10/15 Ari Savolainen <ari.m.savolainen@...il.com>:
> Hi,
>
> I get this panic when I try to print from a virtual machine:
>
> https://docs.google.com/leaf?id=0B7LPWLwa6EUaODIxYTY2YmQtNWJlZS00M2ViLTk5ZmEtNDM2ZTZmNzE2MDEz&hl=fi
>
> I tried to bisect it, but couldn't finish, because after the last step
> the boot process got stuck right after selecting the kernel in grub
> and I ran out of time:
>
> git bisect start
> # bad: [322a8b034003c0d46d39af85bf24fee27b902f48] Linux 3.1-rc1
> git bisect bad 322a8b034003c0d46d39af85bf24fee27b902f48
> # good: [02f8c6aee8df3cdc935e9bdd4f2d020306035dbe] Linux 3.0
> git bisect good 02f8c6aee8df3cdc935e9bdd4f2d020306035dbe
> # bad: [0003230e8200699860f0b10af524dc47bf8aecad] Merge branch
> 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
> git bisect bad 0003230e8200699860f0b10af524dc47bf8aecad
> # bad: [72f96e0e38d7e29ba16dcfd824ecaebe38b8293e] Merge branch
> 'for-linus-core' of
> git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending
> git bisect bad 72f96e0e38d7e29ba16dcfd824ecaebe38b8293e
> # good: [204d1641d200709c759d8c269458cbc7de378c40] Merge branch
> 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6
> into for-davem
> git bisect good 204d1641d200709c759d8c269458cbc7de378c40
> # bad: [415b3334a21aa67806c52d1acf4e72e14f7f402f] icmp: Fix regression
> in nexthop resolution during replies.
> git bisect bad 415b3334a21aa67806c52d1acf4e72e14f7f402f
> # bad: [95a943c162d74b20d869917bdf5df11293c35b63] Merge branch
> 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6
> into for-davem
> git bisect bad 95a943c162d74b20d869917bdf5df11293c35b63
>
> In the first bad kernel (3.1-rc1) there was this in the log:
>
> [  105.612095]
> [  105.612096] ===================================================
> [  105.612100] [ INFO: suspicious rcu_dereference_check() usage. ]
> [  105.612101] ---------------------------------------------------
> [  105.612103] include/net/dst.h:91 invoked rcu_dereference_check()
> without protection!
> [  105.612105]
> [  105.612106] other info that might help us debug this:
> [  105.612106]
> [  105.612108]
> [  105.612108] rcu_scheduler_active = 1, debug_locks = 0
> [  105.612110] 1 lock held by dnsmasq/2618:
> [  105.612111]  #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff815df8c7>]
> rtnl_lock+0x17/0x20
> [  105.612120]
> [  105.612121] stack backtrace:
> [  105.612123] Pid: 2618, comm: dnsmasq Not tainted 3.1.0-rc1 #41
> [  105.612125] Call Trace:
> [  105.612129]  [<ffffffff810ccdcb>] lockdep_rcu_dereference+0xbb/0xc0
> [  105.612132]  [<ffffffff815dc5a9>] neigh_update+0x4f9/0x5f0
> [  105.612135]  [<ffffffff815da001>] ? neigh_lookup+0xe1/0x220
> [  105.612139]  [<ffffffff81639298>] arp_req_set+0xb8/0x230
> [  105.612142]  [<ffffffff8163a59f>] arp_ioctl+0x1bf/0x310
> [  105.612146]  [<ffffffff810baa40>] ? lock_hrtimer_base.isra.26+0x30/0x60
> [  105.612150]  [<ffffffff8163fb75>] inet_ioctl+0x85/0x90
> [  105.612154]  [<ffffffff815b5520>] sock_do_ioctl+0x30/0x70
> [  105.612157]  [<ffffffff815b55d3>] sock_ioctl+0x73/0x280
> [  105.612162]  [<ffffffff811b7698>] do_vfs_ioctl+0x98/0x570
> [  105.612165]  [<ffffffff811a5c40>] ? fget_light+0x340/0x3a0
> [  105.612168]  [<ffffffff811b7bbf>] sys_ioctl+0x4f/0x80
> [  105.612172]  [<ffffffff816fdcab>] system_call_fastpath+0x16/0x1b
>
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