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Message-ID: <4DE94EDD.8090707@free.fr>
Date: Fri, 03 Jun 2011 23:15:09 +0200
From: Laurent Riffard <laurent.riffard@...e.fr>
To: Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC: netdev@...r.kernel.org
Subject: Re: [BUG] netconsole broken by scheduler updates
Le 26/05/2011 18:17, Peter Zijlstra a écrit :
> On Thu, 2011-05-26 at 18:12 +0200, Laurent Riffard wrote:
>> Le 26/05/2011 12:35, Laurent Riffard a écrit :
>>> On Thu, 26 May 2011, Peter Zijlstra wrote:
>>>> On Thu, 2011-05-26 at 11:21 +0200, Laurent Riffard wrote:
>>>>> Hi,
>>>>>
>>>>> Recently, netconsole was broken by some scheduler updates. Kernel hangs
>>>>> on boot near the network card initialization. I noticed that it does
>>>>> hang just where a "inconsistent lock state" message normally appears.
>>>>>
>>>>> I did a bisection : e4a52bcb9a18142d79e231b6733cabdbf2e67c1f is the
>>>>> first bad commit.
>>>>> commit e4a52bcb9a18142d79e231b6733cabdbf2e67c1f
>>>>> Author: Peter Zijlstra <a.p.zijlstra@...llo.nl>
>>>>> Date: Tue Apr 5 17:23:54 2011 +0200
>>>>>
>>>>> sched: Remove rq->lock from the first half of ttwu()
>>>>>
>>>>>
>>>>> Before this commit, kernel was booting succesfully despite the
>>>>> "inconsistent lock state" message. After this commit, the kernel does
>>>>> hang on boot, I have to push the reset button.
>>>>
>>>> Do you have CONFIG_HARDLOCKUP_DETECTOR=y, and do you get an NMI splat
>>>> after some 10 seconds? It would be interesting to see where its stuck.
>>>
>>> CONFIG_HARDLOCKUP_DETECTOR is not set for now. I'll give it a try.
>>
>> I activated CONFIG_HARDLOCKUP_DETECTOR, but failed to obtain more
>> information. During the boot, the kernel hangs just after bringing up
>> the NIC. I waited 2 minutes, without getting any more messages.
>
> OK, thanks for trying, I shall try and reproduce locally.
>
Hello,
I tried some newer kernel. It boots successfully now, but
I've got interesting (?) logs :
====================================================
[ 0.000000] Initializing cgroup subsys cpu
[ 0.000000] Linux version 3.0.0-rc1-00049-g1fa7b6a (laurent@...imero) (gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) ) #148 SMP PREEMPT Thu Jun 2 18:56:41 CEST 2011
[ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.0.0-rc1-00049-g1fa7b6a root=/dev/mapper/vglinux1-lv_ubuntu_64bits ro debug netconsole=4444@....168.0.9/eth0,6666@....168.0.10/6C:62:6D:48:4B:C7 splash vt.handoff=7
[...]
[ 0.685768] Console: switching to colour frame buffer device 160x64
[ 0.707611] fb0: VESA VGA frame buffer device
[ 0.714029] Linux agpgart interface v0.103
[ 0.714206] forcedeth: Reverse Engineered nForce ethernet driver. Version 0.64.
[ 0.714837] ACPI: PCI Interrupt Link [APCH] enabled at IRQ 23
[ 0.715054] forcedeth 0000:00:0a.0: PCI INT A -> Link[APCH] -> GSI 23 (level, low) -> IRQ 23
[ 0.715283] forcedeth 0000:00:0a.0: setting latency timer to 64
[ 1.241552] forcedeth 0000:00:0a.0: ifname eth0, PHY OUI 0x732 @ 1, addr 00:1f:d0:53:49:ae
[ 1.241784] forcedeth 0000:00:0a.0: highdma pwrctl mgmt gbit lnktim msi desc-v3
[ 1.242101] netconsole: local port 4444
[ 1.242207] netconsole: local IP 192.168.0.9
[ 1.242320] netconsole: interface 'eth0'
[ 1.242426] netconsole: remote port 6666
[ 1.242531] netconsole: remote IP 192.168.0.10
[ 1.242650] netconsole: remote ethernet address 6c:62:6d:48:4b:c7
[ 1.242822] netconsole: device eth0 not up yet, forcing it
[ 1.244612] forcedeth 0000:00:0a.0: irq 40 for MSI/MSI-X
[ 1.245057] forcedeth 0000:00:0a.0: eth0: no link during initialization
[ 2.374451] forcedeth 0000:00:0a.0: eth0: link up
[ 2.381178]
[ 2.381179] =================================
[ 2.381182] [ INFO: inconsistent lock state ]
[ 2.381184] 3.0.0-rc1-00049-g1fa7b6a #148
[ 2.381186] ---------------------------------
[ 2.381188] inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
[ 2.381191] swapper/1 [HC0[0]:SC0[0]:HE1:SE1] takes:
[ 2.381193] (&(&napi->poll_lock)->rlock){+.?...}, at: [<ffffffff8123cd08>] netpoll_poll_dev+0x9d/0x4ed
[ 2.381202] {IN-SOFTIRQ-W} state was registered at:
[ 2.381204] [<ffffffff81068020>] __lock_acquire+0x319/0xdd8
[ 2.381208] [<ffffffff81068f9f>] lock_acquire+0xd8/0x103
[ 2.381211] [<ffffffff8129c019>] _raw_spin_lock+0x36/0x45
[ 2.381215] [<ffffffff8122b886>] net_rx_action+0x8d/0x1e7
[ 2.381219] [<ffffffff81040f73>] __do_softirq+0xe1/0x1c0
[ 2.381223] [<ffffffff8129e39c>] call_softirq+0x1c/0x30
[ 2.381226] [<ffffffff81004296>] do_softirq+0x46/0x9c
[ 2.381229] [<ffffffff810412c5>] irq_exit+0x4d/0xa2
[ 2.381232] [<ffffffff81003f3a>] do_IRQ+0x88/0x9f
[ 2.381235] [<ffffffff8129cb93>] ret_from_intr+0x0/0x1a
[ 2.381239] [<ffffffff8100972c>] default_idle+0x40/0x74
[ 2.381242] [<ffffffff81009844>] amd_e400_idle+0xe4/0xe6
[ 2.381246] [<ffffffff81001270>] cpu_idle+0x5e/0x94
[ 2.381249] [<ffffffff81296383>] start_secondary+0x18a/0x18f
[ 2.381252] irq event stamp: 1000341
[ 2.381254] hardirqs last enabled at (1000341): [<ffffffff8129cc58>] restore_args+0x0/0x30
[ 2.381257] hardirqs last disabled at (1000339): [<ffffffff8104100a>] __do_softirq+0x178/0x1c0
[ 2.381261] softirqs last enabled at (1000340): [<ffffffff8104103c>] __do_softirq+0x1aa/0x1c0
[ 2.381264] softirqs last disabled at (1000251): [<ffffffff8129e39c>] call_softirq+0x1c/0x30
[ 2.381267]
[ 2.381268] other info that might help us debug this:
[ 2.381269] Possible unsafe locking scenario:
[ 2.381270]
[ 2.381271] CPU0
[ 2.381272] ----
[ 2.381273] lock(&(&napi->poll_lock)->rlock);
[ 2.381275] <Interrupt>
[ 2.381276] lock(&(&napi->poll_lock)->rlock);
[ 2.381279]
[ 2.381279] *** DEADLOCK ***
[ 2.381280]
[ 2.381282] 1 lock held by swapper/1:
[ 2.381283] #0: (target_list_lock){+.+...}, at: [<ffffffff811e5877>] write_msg+0x34/0xcd
[ 2.381288]
[ 2.381289] stack backtrace:
[ 2.381291] Pid: 1, comm: swapper Not tainted 3.0.0-rc1-00049-g1fa7b6a #148
[ 2.381293] Call Trace:
[ 2.381297] [<ffffffff81067b1d>] valid_state+0x217/0x229
[ 2.381300] [<ffffffff81067396>] ? check_usage_forwards+0x85/0x85
[ 2.381303] [<ffffffff81067c11>] mark_lock+0xe2/0x1d8
[ 2.381306] [<ffffffff810693bb>] ? trace_hardirqs_on_caller+0x10b/0x12f
[ 2.381309] [<ffffffff8106809e>] __lock_acquire+0x397/0xdd8
[ 2.381314] [<ffffffff8106e882>] ? arch_local_irq_restore+0x6/0xd
[ 2.381317] [<ffffffff8123cd08>] ? netpoll_poll_dev+0x9d/0x4ed
[ 2.381320] [<ffffffff81068f9f>] lock_acquire+0xd8/0x103
[ 2.381324] [<ffffffff8123cd08>] ? netpoll_poll_dev+0x9d/0x4ed
[ 2.381327] [<ffffffff8129c557>] _raw_spin_trylock+0x4a/0x7f
[ 2.381331] [<ffffffff8123cd08>] ? netpoll_poll_dev+0x9d/0x4ed
[ 2.381334] [<ffffffff8123cd08>] netpoll_poll_dev+0x9d/0x4ed
[ 2.381338] [<ffffffff8123d2ee>] netpoll_send_skb_on_dev+0x10b/0x20f
[ 2.381342] [<ffffffff8123d5dd>] netpoll_send_udp+0x1eb/0x1fa
[ 2.381345] [<ffffffff811e5877>] ? write_msg+0x34/0xcd
[ 2.381348] [<ffffffff811e58cf>] write_msg+0x8c/0xcd
[ 2.381352] [<ffffffff8103b78d>] __call_console_drivers+0x72/0x84
[ 2.381355] [<ffffffff8103b7f8>] _call_console_drivers+0x59/0x5e
[ 2.381359] [<ffffffff8103c033>] console_unlock+0xf3/0x1ac
[ 2.381362] [<ffffffff8103c891>] register_console+0x228/0x2b3
[ 2.381366] [<ffffffff816a76b0>] init_netconsole+0x15d/0x1e4
[ 2.381371] [<ffffffff81166a64>] ? __pci_register_driver+0x9b/0xcd
[ 2.381374] [<ffffffff816a7553>] ? option_setup+0x1f/0x1f
[ 2.381377] [<ffffffff8100030f>] do_one_initcall+0x7a/0x137
[ 2.381381] [<ffffffff81685bcd>] kernel_init+0xb5/0x135
[ 2.381386] [<ffffffff81157d1e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 2.381389] [<ffffffff8129e2a4>] kernel_thread_helper+0x4/0x10
[ 2.381392] [<ffffffff8129cc58>] ? retint_restore_args+0x13/0x13
[ 2.381396] [<ffffffff81685b18>] ? start_kernel+0x360/0x360
[ 2.381399] [<ffffffff8129e2a0>] ? gs_change+0x13/0x13
[ 2.381464] ------------[ cut here ]------------
[ 2.381468] WARNING: at net/core/netpoll.c:346 netpoll_send_skb_on_dev+0x158/0x20f()
[ 2.381470] Hardware name: M68SM-S2L
[ 2.381473] netpoll_send_skb(): eth0 enabled interrupts in poll (nv_start_xmit_optimized+0x0/0x484)
[ 2.381474] Modules linked in:
[ 2.381477] Pid: 1, comm: swapper Not tainted 3.0.0-rc1-00049-g1fa7b6a #148
[ 2.381479] Call Trace:
[ 2.381482] [<ffffffff8103b381>] warn_slowpath_common+0x80/0x98
[ 2.381485] [<ffffffff8103b42d>] warn_slowpath_fmt+0x41/0x43
[ 2.381489] [<ffffffff811e526c>] ? nv_start_xmit+0x3df/0x3df
[ 2.381492] [<ffffffff8123d33b>] netpoll_send_skb_on_dev+0x158/0x20f
[ 2.381496] [<ffffffff8123d5dd>] netpoll_send_udp+0x1eb/0x1fa
[ 2.381499] [<ffffffff811e5877>] ? write_msg+0x34/0xcd
[ 2.381502] [<ffffffff811e58cf>] write_msg+0x8c/0xcd
[ 2.381505] [<ffffffff8103b78d>] __call_console_drivers+0x72/0x84
[ 2.381508] [<ffffffff8103b7f8>] _call_console_drivers+0x59/0x5e
[ 2.381512] [<ffffffff8103c033>] console_unlock+0xf3/0x1ac
[ 2.381515] [<ffffffff8103c891>] register_console+0x228/0x2b3
[ 2.381518] [<ffffffff816a76b0>] init_netconsole+0x15d/0x1e4
[ 2.381522] [<ffffffff81166a64>] ? __pci_register_driver+0x9b/0xcd
[ 2.381525] [<ffffffff816a7553>] ? option_setup+0x1f/0x1f
[ 2.381528] [<ffffffff8100030f>] do_one_initcall+0x7a/0x137
[ 2.381531] [<ffffffff81685bcd>] kernel_init+0xb5/0x135
[ 2.381535] [<ffffffff81157d1e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 2.381538] [<ffffffff8129e2a4>] kernel_thread_helper+0x4/0x10
[ 2.381541] [<ffffffff8129cc58>] ? retint_restore_args+0x13/0x13
[ 2.381545] [<ffffffff81685b18>] ? start_kernel+0x360/0x360
[ 2.381548] [<ffffffff8129e2a0>] ? gs_change+0x13/0x13
[ 2.381555] ---[ end trace f00f2127e552114f ]---
[ 2.383979] console [netcon0] enabled
[ 2.384117] netconsole: network logging started
[ 2.384492] i8042: PNP: PS/2 Controller [PNP0303:PS2K] at 0x60,0x64 irq 1
[ 2.384679] i8042: PNP: PS/2 appears to have AUX port disabled, if this is incorrect please boot with i8042.nopnp
[ 2.385208] serio: i8042 KBD port at 0x60,0x64 irq 1
[...]
==================================================================
hope this help
~~
laurent
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