It seems that 'ethtool -t ethX' causes a BUG on 2.6.34.8 (at least).
Here is info from a lock-dep enabled build. I haven't had time to
poke at it any closer yet...
You get a BUG without lockdep as well, but of course it looks different
than what is below.
ixgbe 0000:03:00.1: eth9: NIC Link is Down
INFO: trying to register non-static key (ffff88031b8ca130) lock-name: (null)
is_module_addr: 0
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
Pid: 3100, comm: ethtool Not tainted 2.6.34.8 #1
Call Trace:
[<ffffffff81065c6e>] register_lock_class+0x186/0x359
[<ffffffff810669b4>] ? mark_lock+0x2d/0x22d
[<ffffffff81066c06>] ? mark_held_locks+0x52/0x70
[<ffffffff81067a07>] __lock_acquire+0xc2/0xcf8
[<ffffffff8108e0d7>] ? free_irq+0x3b/0x4e
[<ffffffff81066c06>] ? mark_held_locks+0x52/0x70
[<ffffffff810d2ff8>] ? kfree+0xd5/0xee
[<ffffffff81066e85>] ? trace_hardirqs_on_caller+0x111/0x135
[<ffffffff81066eb6>] ? trace_hardirqs_on+0xd/0xf
[<ffffffff810686a1>] lock_acquire+0x64/0x81
[<ffffffffa005f876>] ? ixgbe_close+0x36/0x140 [ixgbe]
[<ffffffff8108e0e1>] ? free_irq+0x45/0x4e
[<ffffffff813e8001>] _raw_spin_lock+0x36/0x45
[<ffffffffa005f876>] ? ixgbe_close+0x36/0x140 [ixgbe]
[<ffffffffa005ed9f>] ? ixgbe_free_irq+0x4f/0x1b0 [ixgbe]
[<ffffffffa005f876>] ixgbe_close+0x36/0x140 [ixgbe]
[<ffffffff81343f2a>] __dev_close+0x73/0x86
[<ffffffff813440a4>] dev_close+0x1a/0x40
[<ffffffffa006bd2f>] ixgbe_diag_test+0x14f/0x17d0 [ixgbe]
[<ffffffff810669b4>] ? mark_lock+0x2d/0x22d
[<ffffffff81066c06>] ? mark_held_locks+0x52/0x70
[<ffffffff810d37b6>] ? __kmalloc+0xec/0x11c
[<ffffffff813475ef>] ? dev_ethtool+0x865/0x14c2
[<ffffffff81066e85>] ? trace_hardirqs_on_caller+0x111/0x135
[<ffffffff81066eb6>] ? trace_hardirqs_on+0xd/0xf
[<ffffffff8134760c>] dev_ethtool+0x882/0x14c2
[<ffffffff8134584d>] dev_ioctl+0x4e6/0x62d
[<ffffffff810a06da>] ? unlock_page+0x22/0x27
[<ffffffff81331f83>] sock_do_ioctl+0x38/0x43
[<ffffffff8133238b>] sock_ioctl+0x20e/0x21d
[<ffffffff810b813e>] ? handle_mm_fault+0x374/0x809
[<ffffffff810ebd8d>] vfs_ioctl+0x2d/0xa1
[<ffffffff810ec303>] do_vfs_ioctl+0x48b/0x4d1
[<ffffffff8105b340>] ? up_read+0x1e/0x36
[<ffffffff813e8cf9>] ? retint_swapgs+0x13/0x1b
[<ffffffff810ec39a>] sys_ioctl+0x51/0x74
[<ffffffff81009a82>] system_call_fastpath+0x16/0x1b
BUG: spinlock bad magic on CPU#6, ethtool/3100
lock: ffff88031b8ca118, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
Pid: 3100, comm: ethtool Not tainted 2.6.34.8 #1
Call Trace:
[<ffffffff811d3e3a>] spin_bug+0x9c/0xa3
[<ffffffff811d3ef5>] do_raw_spin_lock+0x29/0x13c
[<ffffffff813e8009>] _raw_spin_lock+0x3e/0x45
[<ffffffffa005f876>] ? ixgbe_close+0x36/0x140 [ixgbe]
[<ffffffffa005ed9f>] ? ixgbe_free_irq+0x4f/0x1b0 [ixgbe]
[<ffffffffa005f876>] ixgbe_close+0x36/0x140 [ixgbe]
[<ffffffff81343f2a>] __dev_close+0x73/0x86
[<ffffffff813440a4>] dev_close+0x1a/0x40
[<ffffffffa006bd2f>] ixgbe_diag_test+0x14f/0x17d0 [ixgbe]
[<ffffffff810669b4>] ? mark_lock+0x2d/0x22d
[<ffffffff81066c06>] ? mark_held_locks+0x52/0x70
[<ffffffff810d37b6>] ? __kmalloc+0xec/0x11c
[<ffffffff813475ef>] ? dev_ethtool+0x865/0x14c2
[<ffffffff81066e85>] ? trace_hardirqs_on_caller+0x111/0x135
[<ffffffff81066eb6>] ? trace_hardirqs_on+0xd/0xf
[<ffffffff8134760c>] dev_ethtool+0x882/0x14c2
[<ffffffff8134584d>] dev_ioctl+0x4e6/0x62d
[<ffffffff810a06da>] ? unlock_page+0x22/0x27
[<ffffffff81331f83>] sock_do_ioctl+0x38/0x43
[<ffffffff8133238b>] sock_ioctl+0x20e/0x21d
[<ffffffff810b813e>] ? handle_mm_fault+0x374/0x809
[<ffffffff810ebd8d>] vfs_ioctl+0x2d/0xa1
[<ffffffff810ec303>] do_vfs_ioctl+0x48b/0x4d1
[<ffffffff8105b340>] ? up_read+0x1e/0x36
[<ffffffff813e8cf9>] ? retint_swapgs+0x13/0x1b
[<ffffffff810ec39a>] sys_ioctl+0x51/0x74
[<ffffffff81009a82>] system_call_fastpath+0x16/0x1b
=====================================
[ BUG: bad unlock balance detected! ]
-------------------------------------
ethtool/3100 is trying to release lock ((null)) at:
[<ffffffffa005f8d6>] ixgbe_close+0x96/0x140 [ixgbe]
but there are no more locks to release!
other info that might help us debug this:
1 lock held by ethtool/3100:
#0: (rtnl_mutex){+.+.+.}, at: [<ffffffff8134dd70>] rtnl_lock+0x12/0x14
stack backtrace:
Pid: 3100, comm: ethtool Not tainted 2.6.34.8 #1
Call Trace:
[<ffffffffa005f8d6>] ? ixgbe_close+0x96/0x140 [ixgbe]
[<ffffffff810687c4>] print_unlock_inbalance_bug+0xd6/0xe0
[<ffffffff8106888e>] lock_release_non_nested+0xc0/0x227
[<ffffffffa005f8d6>] ? ixgbe_close+0x96/0x140 [ixgbe]
[<ffffffffa005f8d6>] ? ixgbe_close+0x96/0x140 [ixgbe]
[<ffffffff81068b31>] lock_release+0x13c/0x167
[<ffffffff813e85c4>] _raw_spin_unlock+0x1e/0x52
[<ffffffffa005f8d6>] ixgbe_close+0x96/0x140 [ixgbe]
[<ffffffff81343f2a>] __dev_close+0x73/0x86
[<ffffffff813440a4>] dev_close+0x1a/0x40
[<ffffffffa006bd2f>] ixgbe_diag_test+0x14f/0x17d0 [ixgbe]
[<ffffffff810669b4>] ? mark_lock+0x2d/0x22d
[<ffffffff81066c06>] ? mark_held_locks+0x52/0x70
[<ffffffff810d37b6>] ? __kmalloc+0xec/0x11c
[<ffffffff813475ef>] ? dev_ethtool+0x865/0x14c2
[<ffffffff81066e85>] ? trace_hardirqs_on_caller+0x111/0x135
[<ffffffff81066eb6>] ? trace_hardirqs_on+0xd/0xf
[<ffffffff8134760c>] dev_ethtool+0x882/0x14c2
[<ffffffff8134584d>] dev_ioctl+0x4e6/0x62d
[<ffffffff810a06da>] ? unlock_page+0x22/0x27
[<ffffffff81331f83>] sock_do_ioctl+0x38/0x43
[<ffffffff8133238b>] sock_ioctl+0x20e/0x21d
[<ffffffff810b813e>] ? handle_mm_fault+0x374/0x809
[<ffffffff810ebd8d>] vfs_ioctl+0x2d/0xa1
[<ffffffff810ec303>] do_vfs_ioctl+0x48b/0x4d1
[<ffffffff8105b340>] ? up_read+0x1e/0x36
[<ffffffff813e8cf9>] ? retint_swapgs+0x13/0x1b
[<ffffffff810ec39a>] sys_ioctl+0x51/0x74
[<ffffffff81009a82>] system_call_fastpath+0x16/0x1b
BUG: spinlock bad magic on CPU#6, ethtool/3100
lock: ffff88031b8ca118, .magic: 00000000, .owner: ethtool/3100, .owner_cpu: 6
Pid: 3100, comm: ethtool Not tainted 2.6.34.8 #1
Call Trace:
[<ffffffff811d3e3a>] spin_bug+0x9c/0xa3
[<ffffffff811d3e62>] do_raw_spin_unlock+0x21/0x8b
[<ffffffff813e85cc>] _raw_spin_unlock+0x26/0x52
[<ffffffffa005f8d6>] ixgbe_close+0x96/0x140 [ixgbe]
[<ffffffff81343f2a>] __dev_close+0x73/0x86
[<ffffffff813440a4>] dev_close+0x1a/0x40
[<ffffffffa006bd2f>] ixgbe_diag_test+0x14f/0x17d0 [ixgbe]
[<ffffffff810669b4>] ? mark_lock+0x2d/0x22d
[<ffffffff81066c06>] ? mark_held_locks+0x52/0x70
[<ffffffff810d37b6>] ? __kmalloc+0xec/0x11c
[<ffffffff813475ef>] ? dev_ethtool+0x865/0x14c2
[<ffffffff81066e85>] ? trace_hardirqs_on_caller+0x111/0x135
[<ffffffff81066eb6>] ? trace_hardirqs_on+0xd/0xf
[<ffffffff8134760c>] dev_ethtool+0x882/0x14c2
[<ffffffff8134584d>] dev_ioctl+0x4e6/0x62d
[<ffffffff810a06da>] ? unlock_page+0x22/0x27
[<ffffffff81331f83>] sock_do_ioctl+0x38/0x43
[<ffffffff8133238b>] sock_ioctl+0x20e/0x21d
[<ffffffff810b813e>] ? handle_mm_fault+0x374/0x809
[<ffffffff810ebd8d>] vfs_ioctl+0x2d/0xa1
[<ffffffff810ec303>] do_vfs_ioctl+0x48b/0x4d1
[<ffffffff8105b340>] ? up_read+0x1e/0x36
[<ffffffff813e8cf9>] ? retint_swapgs+0x13/0x1b
[<ffffffff810ec39a>] sys_ioctl+0x51/0x74
[<ffffffff81009a82>] system_call_fastpath+0x16/0x1b
--
Ben Greear <gree...@candelatech.com>
Candela Technologies Inc http://www.candelatech.com
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