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Message-ID: <CAEbykaXz+J8abVzU3yjqZG2+yhHNrQWsQy2c8wNyoERWPpxWKQ@mail.gmail.com>
Date: Sat, 15 Oct 2011 10:50:43 +0300
From: Ari Savolainen <ari.m.savolainen@...il.com>
To: "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Kernel panic from tg3 net driver
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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