From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A0BECC433EF for ; Wed, 3 Nov 2021 00:18:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6B59860E08 for ; Wed, 3 Nov 2021 00:18:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232831AbhKCAUw (ORCPT ); Tue, 2 Nov 2021 20:20:52 -0400 Received: from mga07.intel.com ([134.134.136.100]:29361 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232830AbhKCAUv (ORCPT ); Tue, 2 Nov 2021 20:20:51 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10156"; a="294849322" X-IronPort-AV: E=Sophos;i="5.87,203,1631602800"; d="scan'208";a="294849322" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Nov 2021 17:17:32 -0700 X-IronPort-AV: E=Sophos;i="5.87,203,1631602800"; d="scan'208";a="583904068" Received: from yoojae-mobl.amr.corp.intel.com (HELO [10.209.55.177]) ([10.209.55.177]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Nov 2021 17:17:31 -0700 Message-ID: Date: Tue, 2 Nov 2021 17:17:30 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.2.1 Subject: Re: [PATCH -next 0/4] Add LCLK control into Aspeed LPC sub drivers Content-Language: en-US To: Zev Weiss , Joel Stanley Cc: Jae Hyun Yoo , Rob Herring , Corey Minyard , Andrew Jeffery , Cedric Le Goater , Haiyue Wang , devicetree , Linux ARM , linux-aspeed , openipmi-developer@lists.sourceforge.net References: <20211101233751.49222-1-jae.hyun.yoo@intel.com> From: Jae Hyun Yoo In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Hi Zev, On 11/2/2021 5:04 PM, Zev Weiss wrote: > On Mon, Nov 01, 2021 at 04:36:38PM PDT, Joel Stanley wrote: >> On Mon, 1 Nov 2021 at 23:18, wrote: >>> >>> From: Jae Hyun Yoo >>> >>> Hello all, >>> >>> This series is for appliying below fix to all Aspped LPC sub drivers. >>> https://lore.kernel.org/all/20201208091748.1920-1-wangzhiqiang.bj@bytedance.com/ >>> >>> >>> An LPC sub driver can be enabled without using the lpc-ctrl driver or it >>> can be registered ahead of lpc-ctrl depends on each system >>> configuration and >>> this difference introduces that LPC can be enabled without heart >>> beating of >>> LCLK so it causes improper handling on host interrupts when the host >>> sends >>> interrupts in that time frame. Then kernel eventually forcibly >>> disables the >>> interrupt with dumping stack and printing a 'nobody cared this irq' >>> message >>> out. >>> >>> To prevent this issue, all LPC sub drivers should enable LCLK >>> individually >>> so this patch adds clock control logic into the remaining Aspeed LPC sub >>> drivers. >> >> Thanks for sending this out! >> >> This will resolve a few of the issues we have in the issue tracker: >> >> https://github.com/openbmc/linux/issues/210 >> https://github.com/openbmc/linux/issues/130 >> >> The patches look good to me. I think you've just missed Corey's PR for >> v5.16, but I will stick them in the openbmc tree once they've had a >> review. >> > > Hi Jae, > > I tried this series out on the same in-progress OpenBMC port from issue > number 210 linked above and am still seeing problems (dmesg pasted below). > > I cherry-picked commit f9241fe8b9652 ("ARM: dts: aspeed: Add uart > routing to device tree") from linux-next to allow the first patch to > apply cleanly; is there anything else I might be missing that'd be > needed to test the series properly? Looks like below dmesg shows an error from 'aspeed_lpc_snoop_probe' which this series doesn't touch. Do you have below fix in your code tree? https://lore.kernel.org/all/20201208091748.1920-1-wangzhiqiang.bj@bytedance.com/ Thanks, Jae > > Thanks, > Zev > > [    0.417811] irq 32: nobody cared (try booting with the "irqpoll" option) > [    0.417858] CPU: 0 PID: 1 Comm: swapper Not tainted > 5.14.11-aee45db-dirty-4b119be-hacked #1 > [    0.417899] Hardware name: Generic DT based system > [    0.417922] Backtrace: [    0.417958] [<807e64e4>] (dump_backtrace) > from [<807e6738>] (show_stack+0x20/0x24) > [    0.418052]  r7:00000000 r6:00000008 r5:00000000 r4:80902b50 > [    0.418074] [<807e6718>] (show_stack) from [<807f09d0>] > (dump_stack+0x28/0x30) > [    0.418133] [<807f09a8>] (dump_stack) from [<807e76c0>] > (__report_bad_irq+0x40/0xc0) > [    0.418189]  r5:00000000 r4:80d43900 > [    0.418211] [<807e7680>] (__report_bad_irq) from [<80159c10>] > (note_interrupt+0x284/0x2dc) > [    0.418286]  r9:80cbc000 r8:00000020 r7:00000000 r6:00000008 > r5:00000000 r4:80d43900 > [    0.418307] [<8015998c>] (note_interrupt) from [<801569d4>] > (handle_irq_event+0xb4/0xc0) > [    0.418366]  r10:00000000 r9:80cbc000 r8:80d439a8 r7:00000000 > r6:00000008 r5:00000000 > [    0.418390]  r4:80d43900 r3:00000000 > [    0.418408] [<80156920>] (handle_irq_event) from [<8015acd0>] > (handle_level_irq+0xac/0x180) > [    0.418464]  r5:00000000 r4:80d43900 > [    0.418484] [<8015ac24>] (handle_level_irq) from [<80155fa4>] > (handle_domain_irq+0x60/0x7c) > [    0.418539]  r5:00000000 r4:80b8e7c8 > [    0.418558] [<80155f44>] (handle_domain_irq) from [<8010121c>] > (avic_handle_irq+0x64/0x6c) > [    0.418618]  r7:80cbdc94 r6:ffffffff r5:80cbdc60 r4:80c02420 > [    0.418639] [<801011b8>] (avic_handle_irq) from [<80100aec>] > (__irq_svc+0x6c/0x90) > [    0.418685] Exception stack(0x80cbdc60 to 0x80cbdca8) > [    0.418722] dc60: 00000000 00000000 00000000 00000000 80d43900 > 00000000 8529d180 00000020 > [    0.418756] dc80: 80d439a8 60000053 00000000 80cbdcdc 00000000 > 80cbdcb0 8015a520 80157d4c > [    0.418781] dca0: 40000053 ffffffff > [    0.418807]  r5:40000053 r4:80157d4c > [    0.418824] [<80157a0c>] (__setup_irq) from [<8015844c>] > (request_threaded_irq+0xe8/0x16c) > [    0.418887]  r9:852acb60 r8:00000020 r7:80d43910 r6:80d43900 > r5:00000000 r4:8529d180 > [    0.418908] [<80158364>] (request_threaded_irq) from [<8015bd80>] > (devm_request_threaded_irq+0x78/0xd0) > [    0.418979]  r10:8092ed9c r9:00000000 r8:852acb60 r7:80d42410 > r6:00000020 r5:8045ff98 > [    0.419004]  r4:8529d760 r3:00000080 > [    0.419021] [<8015bd08>] (devm_request_threaded_irq) from > [<8046049c>] (aspeed_lpc_snoop_probe+0x110/0x2e0) > [    0.419116]  r10:80bab000 r9:80d42410 r8:8529d140 r7:00000000 > r6:80d42400 r5:852acb60 > [    0.419138]  r4:00000000 > [    0.419155] [<8046038c>] (aspeed_lpc_snoop_probe) from [<804e6980>] > (platform_probe+0x54/0x9c) > [    0.419237]  r9:80983b68 r8:00000000 r7:80d42410 r6:80b6f3dc > r5:80b6f3dc r4:80d42410 > [    0.419259] [<804e692c>] (platform_probe) from [<804e450c>] > (really_probe+0x1c4/0x46c) > [    0.419309]  r5:00000000 r4:80d42410 > [    0.419329] [<804e4348>] (really_probe) from [<804e4888>] > (__driver_probe_device+0xd4/0x1bc) > [    0.419381]  r7:80d42410 r6:80d42410 r5:80bcb44c r4:80b6f3dc > [    0.419401] [<804e47b4>] (__driver_probe_device) from [<804e49b0>] > (driver_probe_device+0x40/0xd8) > [    0.419460]  r9:80983b68 r8:00000000 r7:80d42410 r6:80b6f3dc r4:80bcb340 > [    0.419480] [<804e4970>] (driver_probe_device) from [<804e4d14>] > (__driver_attach+0xa4/0x1c8) > [    0.419538]  r9:80983b68 r8:80a2c838 r7:80b71638 r6:80b6f3dc > r5:80d42454 r4:80d42410 > [    0.419556] [<804e4c70>] (__driver_attach) from [<804e2124>] > (bus_for_each_dev+0x84/0xd0) > [    0.419608]  r7:80b71638 r6:804e4c70 r5:80b6f3dc r4:00000000 > [    0.419628] [<804e20a0>] (bus_for_each_dev) from [<804e5440>] > (driver_attach+0x28/0x30) > [    0.419681]  r6:00000000 r5:852abd20 r4:80b6f3dc > [    0.419700] [<804e5418>] (driver_attach) from [<804e2ac0>] > (bus_add_driver+0x114/0x200) > [    0.419745] [<804e29ac>] (bus_add_driver) from [<804e5adc>] > (driver_register+0x98/0x128) > [    0.419798]  r7:00000000 r6:00000007 r5:00000000 r4:80b6f3dc > [    0.419818] [<804e5a44>] (driver_register) from [<804e7c2c>] > (__platform_driver_register+0x2c/0x34) > [    0.419874]  r5:80c03e40 r4:80a1997c > [    0.419890] [<804e7c00>] (__platform_driver_register) from > [<80a1999c>] (aspeed_lpc_snoop_driver_init+0x20/0x28) > [    0.419951] [<80a1997c>] (aspeed_lpc_snoop_driver_init) from > [<80a01408>] (do_one_initcall+0x64/0x144) > [    0.420024] [<80a013a4>] (do_one_initcall) from [<80a016e4>] > (kernel_init_freeable+0x198/0x218) > [    0.420086]  r7:80a2c858 r6:00000007 r5:80c03e40 r4:80a4c8f0 > [    0.420108] [<80a0154c>] (kernel_init_freeable) from [<807f0c28>] > (kernel_init+0x20/0x134) > [    0.420172]  r10:00000000 r9:00000000 r8:00000000 r7:00000000 > r6:00000000 r5:807f0c08 > [    0.420194]  r4:00000000 > [    0.420211] [<807f0c08>] (kernel_init) from [<80100130>] > (ret_from_fork+0x14/0x24) > [    0.420259] Exception stack(0x80cbdfb0 to 0x80cbdff8) > [    0.420292] dfa0:                                     00000000 > 00000000 00000000 00000000 > [    0.420326] dfc0: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [    0.420356] dfe0: 00000000 00000000 00000000 00000000 00000013 00000000 > [    0.420382]  r5:807f0c08 r4:00000000 > [    0.420400] handlers: > [    0.420417] [<(ptrval)>] aspeed_lpc_snoop_irq > [    0.420482] Disabling IRQ #32 > [    0.638932] Serial: 8250/16550 driver, 6 ports, IRQ sharing enabled > [    0.643436] 1e787000.serial: ttyS5 at MMIO 0x1e787000 (irq = 32, > base_baud = 1546875) is a 8250 > [    0.645555] 1e784000.serial: ttyS4 at MMIO 0x1e784000 (irq = 31, > base_baud = 1500000) is a 16550A > [    2.010064] Freeing initrd memory: 1072K > [    2.232890] printk: console [ttyS4] enabled > [    2.239349] timeriomem_rng 1e6e2078.hwrng: 32bits from 0x6961cb32 @ 1us > [    2.262322] loop: module loaded > [    2.284029] aspeed-smc 1e620000.spi: Using 100 MHz SPI frequency > [    2.290471] aspeed-smc 1e620000.spi: mx66l51235f (65536 Kbytes) > [    2.296451] aspeed-smc 1e620000.spi: CE0 window [ 0x20000000 - > 0x24000000 ] 64MB > [    2.303977] aspeed-smc 1e620000.spi: CE1 window [ 0x24000000 - > 0x2a000000 ] 96MB > [    2.311486] aspeed-smc 1e620000.spi: read control register: 203c0641 > [    2.542638] 5 fixed-partitions partitions found on MTD device bmc > [    2.548875] Creating 5 MTD partitions on "bmc": > [    2.553458] 0x000000000000-0x0000000e0000 : "u-boot" > [    2.561247] 0x0000000e0000-0x000000100000 : "u-boot-env" > [    2.569559] 0x000000100000-0x000000a00000 : "kernel" > [    2.577301] 0x000000a00000-0x000002a00000 : "rofs" > [    2.585054] 0x000002a00000-0x000004000000 : "rwfs" > [    2.628232] libphy: Fixed MDIO Bus: probed > [    2.634437] ftgmac100 1e660000.ethernet: Read MAC address > d0:50:99:f4:1e:18 from chip > [    2.651029] libphy: ftgmac100_mdio: probed > [    2.656253] RTL8211E Gigabit Ethernet 1e660000.ethernet--1:00: > attached PHY driver (mii_bus:phy_addr=1e660000.ethernet--1:00, irq=POLL) > [    2.669669] ftgmac100 1e660000.ethernet eth0: irq 20, mapped at 1ecc0872 > [    2.680442] aspeed_vhub 1e6a0000.usb-vhub: Initialized virtual hub in > USB2 mode > [    2.688464] Mass Storage Function, version: 2009/09/11 > [    2.693666] LUN: removable file: (no medium) > [    2.698021] no file given for LUN0 > [    2.701605] g_mass_storage 1e6a0000.usb-vhub:p1: failed to start > g_mass_storage: -22 > [    2.710113] i2c /dev entries driver > [    2.715459] aspeed-i2c-bus 1e78a040.i2c-bus: i2c bus 0 registered, > irq 33 > [    2.724045] aspeed-i2c-bus 1e78a080.i2c-bus: i2c bus 1 registered, > irq 34 > [    2.733972] aspeed-i2c-bus 1e78a0c0.i2c-bus: i2c bus 2 registered, > irq 35 > [    2.742252] aspeed-i2c-bus 1e78a100.i2c-bus: i2c bus 3 registered, > irq 36 > [    2.750599] aspeed-i2c-bus 1e78a140.i2c-bus: i2c bus 4 registered, > irq 37 > [    2.759769] aspeed-i2c-bus 1e78a180.i2c-bus: i2c bus 5 registered, > irq 38 > [    2.767994] aspeed-i2c-bus 1e78a1c0.i2c-bus: i2c bus 6 registered, > irq 39 > [    2.777783] at24 7-0050: 16384 byte 24c128 EEPROM, writable, 16 > bytes/write > [    2.785096] aspeed-i2c-bus 1e78a300.i2c-bus: i2c bus 7 registered, > irq 40 > [    2.793373] aspeed-i2c-bus 1e78a340.i2c-bus: i2c bus 8 registered, > irq 41 > [    2.801709] aspeed-i2c-bus 1e78a380.i2c-bus: i2c bus 9 registered, > irq 42 > [    2.814947] at24 14-0050: 2048 byte 24c16 EEPROM, read-only > [    2.820929] i2c i2c-2: Added multiplexed i2c bus 14 > [    2.826513] i2c i2c-2: Added multiplexed i2c bus 15 > [    2.832192] i2c i2c-2: Added multiplexed i2c bus 16 > [    2.837821] i2c i2c-2: Added multiplexed i2c bus 17 > [    2.842944] pca954x 2-0070: registered 4 multiplexed busses for I2C > switch pca9545 > [    2.852110] i2c i2c-5: Added multiplexed i2c bus 18 > [    2.857847] i2c i2c-5: Added multiplexed i2c bus 19 > [    2.863603] i2c i2c-5: Added multiplexed i2c bus 20 > [    2.869410] i2c i2c-5: Added multiplexed i2c bus 21 > [    2.874378] pca954x 5-0073: registered 4 multiplexed busses for I2C > switch pca9545 > [    2.884631] Driver for 1-wire Dallas network protocol. > [    3.009394] NET: Registered PF_INET6 protocol family > [    3.017326] Segment Routing with IPv6 > [    3.021945] NET: Registered PF_PACKET protocol family > [    3.027562] 8021q: 802.1Q VLAN Support v1.8 > [    3.263306] irq 32: nobody cared (try booting with the "irqpoll" option) > [    3.270074] CPU: 0 PID: 5 Comm: kworker/u2:0 Not tainted > 5.14.11-aee45db-dirty-4b119be-hacked #1 > [    3.278889] Hardware name: Generic DT based system > [    3.283699] Workqueue: events_unbound deferred_probe_work_func > [    3.289601] Backtrace: [    3.292079] [<807e64e4>] (dump_backtrace) > from [<807e6738>] (show_stack+0x20/0x24) > [    3.299716]  r7:00000000 r6:00000008 r5:00000000 r4:80902b50 > [    3.305382] [<807e6718>] (show_stack) from [<807f09d0>] > (dump_stack+0x28/0x30) > [    3.312646] [<807f09a8>] (dump_stack) from [<807e76c0>] > (__report_bad_irq+0x40/0xc0) > [    3.320433]  r5:00000000 r4:80d43900 > [    3.324022] [<807e7680>] (__report_bad_irq) from [<80159c10>] > (note_interrupt+0x284/0x2dc) > [    3.332349]  r9:80cc6000 r8:00000020 r7:00000000 r6:00000008 > r5:00000000 r4:80d43900 > [    3.340101] [<8015998c>] (note_interrupt) from [<801569d4>] > (handle_irq_event+0xb4/0xc0) > [    3.348242]  r10:00000000 r9:80cc6000 r8:80d439a8 r7:00000000 > r6:00000008 r5:00000000 > [    3.356077]  r4:80d43900 r3:00000400 > [    3.359660] [<80156920>] (handle_irq_event) from [<8015acd0>] > (handle_level_irq+0xac/0x180) > [    3.368047]  r5:00000000 r4:80d43900 > [    3.371629] [<8015ac24>] (handle_level_irq) from [<80155fa4>] > (handle_domain_irq+0x60/0x7c) > [    3.380024]  r5:00000000 r4:80b8e7c8 > [    3.383607] [<80155f44>] (handle_domain_irq) from [<8010121c>] > (avic_handle_irq+0x64/0x6c) > [    3.391919]  r7:80cc7c84 r6:ffffffff r5:80cc7c50 r4:80c02420 > [    3.397586] [<801011b8>] (avic_handle_irq) from [<80100aec>] > (__irq_svc+0x6c/0x90) > [    3.405187] Exception stack(0x80cc7c50 to 0x80cc7c98) > [    3.410262] 7c40:                                     00000000 > 00000000 00000000 00000000 > [    3.418458] 7c60: 80d43900 8529d180 85120d00 00000020 80d439a8 > a0000013 00000000 80cc7ccc > [    3.426647] 7c80: 00000400 80cc7ca0 8015a520 80157d4c 40000013 ffffffff > [    3.433271]  r5:40000013 r4:80157d4c > [    3.436854] [<80157a0c>] (__setup_irq) from [<8015844c>] > (request_threaded_irq+0xe8/0x16c) > [    3.445171]  r9:8505fa20 r8:00000020 r7:80d43910 r6:80d43900 > r5:00000000 r4:85120d00 > [    3.452922] [<80158364>] (request_threaded_irq) from [<8015bd80>] > (devm_request_threaded_irq+0x78/0xd0) > [    3.462366]  r10:80d4ea20 r9:00000000 r8:8505fa20 r7:80d42c10 > r6:00000020 r5:8044fd64 > [    3.470208]  r4:851208e0 r3:00000080 > [    3.473792] [<8015bd08>] (devm_request_threaded_irq) from > [<80450644>] (aspeed_kcs_probe+0x298/0x650) > [    3.483072]  r10:8505fa54 r9:80833650 r8:ffffffea r7:80d42c10 > r6:00000020 r5:8505fa20 > [    3.490912]  r4:80d42c00 > [    3.493456] [<804503ac>] (aspeed_kcs_probe) from [<804e6980>] > (platform_probe+0x54/0x9c) > [    3.501617]  r10:8093c994 r9:80b9b840 r8:00000001 r7:80d42c10 > r6:80b6e7b0 r5:80b6e7b0 > [    3.509458]  r4:80d42c10 > [    3.512003] [<804e692c>] (platform_probe) from [<804e450c>] > (really_probe+0x1c4/0x46c) > [    3.519957]  r5:00000000 r4:80d42c10 > [    3.523538] [<804e4348>] (really_probe) from [<804e4888>] > (__driver_probe_device+0xd4/0x1bc) > [    3.532017]  r7:80d42c10 r6:80d42c10 r5:80bcb44c r4:80b6e7b0 > [    3.537682] [<804e47b4>] (__driver_probe_device) from [<804e49b0>] > (driver_probe_device+0x40/0xd8) > [    3.546683]  r9:80b9b840 r8:00000001 r7:80d42c10 r6:80cc7e84 r4:80bcb340 > [    3.553386] [<804e4970>] (driver_probe_device) from [<804e4be0>] > (__device_attach_driver+0xb8/0x148) > [    3.562568]  r9:80b9b840 r8:00000000 r7:80d42c10 r6:80cc7e84 > r5:80b6e7b0 r4:00000001 > [    3.570313] [<804e4b28>] (__device_attach_driver) from [<804e2648>] > (bus_for_each_drv+0x90/0xe0) > [    3.579145]  r7:80b71484 r6:804e4b28 r5:80cc7e84 r4:00000000 > [    3.584812] [<804e25b8>] (bus_for_each_drv) from [<804e4f3c>] > (__device_attach+0x104/0x18c) > [    3.593201]  r6:80d42c54 r5:00000001 r4:80d42c10 > [    3.597828] [<804e4e38>] (__device_attach) from [<804e536c>] > (device_initial_probe+0x1c/0x20) > [    3.606390]  r6:80d42c10 r5:80b71638 r4:80d4ca50 > [    3.611019] [<804e5350>] (device_initial_probe) from [<804e2860>] > (bus_probe_device+0x94/0x9c) > [    3.619662] [<804e27cc>] (bus_probe_device) from [<804e3f3c>] > (deferred_probe_work_func+0xa0/0xe8) > [    3.628657]  r7:80b71484 r6:80b71470 r5:80d42c10 r4:80d4ca50 > [    3.634324] [<804e3e9c>] (deferred_probe_work_func) from [<801301ac>] > (process_one_work+0x1b4/0x46c) > [    3.643506]  r10:80b71490 r9:00000000 r8:00000000 r7:80c85d00 > r6:00000040 r5:80c045a0 > [    3.651342]  r4:80b7148c r3:804e3e9c > [    3.654925] [<8012fff8>] (process_one_work) from [<8013066c>] > (worker_thread+0x208/0x528) > [    3.663145]  r10:80c08a00 r9:00000088 r8:80b46840 r7:80c08a14 > r6:80c045b4 r5:80c08a00 > [    3.670979]  r4:80c045a0 > [    3.673524] [<80130464>] (worker_thread) from [<80136f18>] > (kthread+0x138/0x160) > [    3.680982]  r10:80c03860 r9:80cbde60 r8:80cc6000 r7:80c045a0 > r6:80130464 r5:80c03840 > [    3.688822]  r4:80c02b80 > [    3.691369] [<80136de0>] (kthread) from [<80100130>] > (ret_from_fork+0x14/0x24) > [    3.698633] Exception stack(0x80cc7fb0 to 0x80cc7ff8) > [    3.703707] 7fa0:                                     00000000 > 00000000 00000000 00000000 > [    3.711904] 7fc0: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [    3.720091] 7fe0: 00000000 00000000 00000000 00000000 00000013 00000000 > [    3.726722]  r10:00000000 r9:00000000 r8:00000000 r7:00000000 > r6:00000000 r5:80136de0 > [    3.734559]  r4:80c02b80 r3:00000000 > [    3.738142] handlers: > [    3.740420] [<8337d287>] aspeed_lpc_snoop_irq > [    3.744851] [] aspeed_kcs_irq > [    3.748741] Disabling IRQ #32 > [    3.752597] ast-kcs-bmc 1e78902c.kcs: Initialised raw client for > channel 3 > [    3.760184] ast-kcs-bmc 1e78902c.kcs: Initialised IPMI client for > channel 3 > [    3.767235] ast-kcs-bmc 1e78902c.kcs: Initialised channel 3 at 0xca2 >