Date:	Mon, 04 Aug 2008 15:00:55 -0300
From:	Breno Leitao <leitao@...ux.vnet.ibm.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	Randy Dunlap <randy.dunlap@...cle.com>,
	netdev <netdev@...r.kernel.org>, mchan@...adcom.com
Subject: Re: 2.6.27-rc1-git4 BUG: sched while atomic

I also have an issue like this one using the latest linus's tree (2.6.27-rc1).  
My calltrace is a bit different, follows: 

BUG: scheduling while atomic: ip/3205/0x00000100
Modules linked in: autofs4 hidp rfcomm l2cap bluetooth sunrpc iptable_filter ip_tables ip6t_REJECT xt_tcpudp ip6table_filter ip6_tables x_tables ipv6 dm_mirror dm_log dm_multipath dm_mod snd_powermac snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_pcm snd_page_alloc snd_timer snd soundcore parport_pc lp parport sg tg3 libphy windfarm_pid windfarm_smu_sat i2c_core shpchp ipr libata sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Call Trace:

[c0000001eb98b160] [c00000000001038c] .show_stack+0x70/0x184 (unreliable)
[c0000001eb98b210] [c00000000006b03c] .__schedule_bug+0x6c/0x88
[c0000001eb98b2a0] [c0000000004020c8] .schedule+0xc4/0x8e4
[c0000001eb98b390] [c000000000402f48] .schedule_timeout+0xa8/0xe8
[c0000001eb98b460] [c00000000007f478] .msleep+0x20/0x38
[c0000001eb98b4d0] [c0000000001e5608] .pci_set_power_state+0x274/0x3cc
[c0000001eb98b580] [d0000000004774f0] .tg3_set_power_state+0x80/0xab4 [tg3]
[c0000001eb98b630] [d000000000480fa4] .tg3_open+0x5c/0x96c [tg3]
[c0000001eb98b6f0] [c00000000036d658] .dev_open+0xe4/0x154
[c0000001eb98b770] [c00000000036baf4] .dev_change_flags+0x104/0x204
[c0000001eb98b810] [c0000000003c9e40] .devinet_ioctl+0x2c4/0x758
[c0000001eb98b910] [c0000000003cadf0] .inet_ioctl+0xd8/0x12c
[c0000001eb98b990] [c00000000035cad8] .sock_ioctl+0x2b8/0x310
[c0000001eb98ba30] [c000000000108c74] .vfs_ioctl+0x5c/0xf0
[c0000001eb98bad0] [c000000000109114] .do_vfs_ioctl+0x40c/0x448
[c0000001eb98bb80] [c0000000001091c0] .sys_ioctl+0x70/0xb4
[c0000001eb98bc30] [c00000000013ddb4] .dev_ifsioc+0x1b0/0x3e4
[c0000001eb98bd40] [c00000000013d374] .compat_sys_ioctl+0x3d4/0x468
[c0000001eb98be30] [c0000000000086b4] syscall_exit+0x0/0x40

This error is easily reproducible, just run "ifup ethX; ifdown ethX".
The cable connection is ok, and the device is working fine with older kernels.
It's important to note that I am running on a PPC machine (JS21). 

Stephen Hemminger wrote:
> On Mon, 4 Aug 2008 09:48:35 -0700
> Randy Dunlap <randy.dunlap@...cle.com> wrote:
> 
>> Usually (e.g., in 2.6.27-rc1 & earlier), I see lots of these messages for
>> some reason:
>>
>> tg3: eth2: Link is up at 1000 Mbps, full duplex.
>> tg3: eth2: Flow control is off for TX and off for RX.
>> tg3: eth3: Link is up at 1000 Mbps, full duplex.
>> tg3: eth3: Flow control is off for TX and off for RX.
>> bnx2: eth1: using MSI
>> bnx2: eth1 NIC SerDes Link is Up, 1000 Mbps full duplex
>> tg3: eth2: Link is up at 1000 Mbps, full duplex.
>> tg3: eth2: Flow control is off for TX and off for RX.
>> tg3: eth3: Link is up at 1000 Mbps, full duplex.
>> tg3: eth3: Flow control is off for TX and off for RX.
>> bnx2: eth1: using MSI
>> bnx2: eth1 NIC SerDes Link is Up, 1000 Mbps full duplex
>> tg3: eth2: Link is up at 1000 Mbps, full duplex.
>> tg3: eth2: Flow control is off for TX and off for RX.
>> tg3: eth3: Link is up at 1000 Mbps, full duplex.
>> tg3: eth3: Flow control is off for TX and off for RX.
>> bnx2: eth1: using MSI
>> bnx2: eth1 NIC SerDes Link is Up, 1000 Mbps full duplex
>> tg3: eth2: Link is up at 1000 Mbps, full duplex.
>> tg3: eth2: Flow control is off for TX and off for RX.
>> tg3: eth3: Link is up at 1000 Mbps, full duplex.
>> tg3: eth3: Flow control is off for TX and off for RX.
>> bnx2: eth1: using MSI
> 
> You have a bad cable or broken ethernet switch that is causing
> the link to restart autonegotiation.
> 
>> In 2.6.27-rc1-git4, I now see this (39 times):
>>
>> BUG: scheduling while atomic: ifconfig/16971/0x00000100
>> Modules linked in: parport_pc lp parport tg3 lpfc cciss ehci_hcd ohci_hcd uhci_hcd
>> Pid: 16971, comm: ifconfig Not tainted 2.6.27-rc1-git4 #1
>>
>> Call Trace:
>>  [<ffffffff80283db9>] ? page_add_new_anon_rmap+0x20/0x22
>>  [<ffffffff802310e9>] __schedule_bug+0x62/0x66
>>  [<ffffffff80551146>] schedule+0x99/0x759
>>  [<ffffffff8023dc9f>] ? __mod_timer+0xc1/0xd3
>>  [<ffffffff8055584a>] ? do_page_fault+0x473/0x7dd
>>  [<ffffffff80551ce4>] schedule_timeout+0x8d/0xb4
>>  [<ffffffff8023d99e>] ? process_timeout+0x0/0xb
>>  [<ffffffff80551cdf>] ? schedule_timeout+0x88/0xb4
>>  [<ffffffff80551d24>] schedule_timeout_uninterruptible+0x19/0x1b
>>  [<ffffffff8023dcc5>] msleep+0x14/0x1e
>>  [<ffffffff80375f2f>] pci_set_power_state+0x1cd/0x292
>>  [<ffffffff803739fc>] ? pci_bus_write_config_dword+0x64/0x73
>>  [<ffffffffa00651b6>] tg3_set_power_state+0x58/0x884 [tg3]
>>  [<ffffffff80552525>] ? __mutex_lock_slowpath+0x1d8/0x1e5
>>  [<ffffffffa006b57a>] tg3_open+0x46/0x6cc [tg3]
>>  [<ffffffff80552525>] ? __mutex_lock_slowpath+0x1d8/0x1e5
>>  [<ffffffff804bdcfe>] dev_open+0x73/0xa8
>>  [<ffffffff804bbf5e>] dev_change_flags+0xab/0x167
>>  [<ffffffff804f7094>] devinet_ioctl+0x269/0x5da
>>  [<ffffffff8026d9da>] ? unlock_page+0x2d/0x32
>>  [<ffffffff804f7ca8>] inet_ioctl+0x92/0xaa
>>  [<ffffffff804b2046>] sock_ioctl+0x1d1/0x1fb
>>  [<ffffffff802a50aa>] vfs_ioctl+0x2a/0x77
>>  [<ffffffff802a534c>] do_vfs_ioctl+0x255/0x272
>>  [<ffffffff8055584a>] ? do_page_fault+0x473/0x7dd
>>  [<ffffffff802a53ab>] sys_ioctl+0x42/0x67
>>  [<ffffffff8020beeb>] system_call_fastpath+0x16/0x1b
> 
> This is a bug.
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