Message-ID: <54F9CC6B.5070803@ti.com>
Date:	Fri, 6 Mar 2015 10:48:59 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	Fengguang Wu <fengguang.wu@...el.com>
CC:	Bjorn Helgaas <bhelgaas@...gle.com>, LKP <lkp@...org>,
	<linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PCI] BUG: unable to handle kernel

On 03/06/2015 10:13 AM, Murali Karicheri wrote:
> On 03/06/2015 01:06 AM, Fengguang Wu wrote:
>> Greetings,
>>
>> 0day kernel testing robot got the below dmesg and the first bad commit is
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
>>
>> commit 0b2af171520e5d5e7d5b5f479b90a6a5014d9df6
>> Author: Murali Karicheri<m-karicheri2@...com>
>> AuthorDate: Tue Mar 3 12:52:13 2015 -0500
>> Commit: Bjorn Helgaas<bhelgaas@...gle.com>
>> CommitDate: Tue Mar 3 14:42:58 2015 -0600
>>
>> PCI: Update DMA configuration from DT
>>
----cut-----------------
>> [ 0.576666] Modules linked in:
>> [ 0.576666] Modules linked in:
>>
>> [ 0.576666] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
>> 4.0.0-rc1-00006-g0b2af17 #6
>> [ 0.576666] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
>> 4.0.0-rc1-00006-g0b2af17 #6
>> [ 0.576666] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
>> BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
>> [ 0.576666] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
>> BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
>> [ 0.576666] task: 78060000 ti: 78068000 task.ti: 78068000
>> [ 0.576666] task: 78060000 ti: 78068000 task.ti: 78068000
>> [ 0.576666] EIP: 0060:[<79a20c33>] EFLAGS: 00010246 CPU: 0
>> [ 0.576666] EIP: 0060:[<79a20c33>] EFLAGS: 00010246 CPU: 0
>> [ 0.576666] EIP is at of_pci_dma_configure+0x33/0x70
>> [ 0.576666] EIP is at of_pci_dma_configure+0x33/0x70
>> [ 0.576666] EAX: 00000000 EBX: 78011800 ECX: 00000000 EDX: 00000005
>> [ 0.576666] EAX: 00000000 EBX: 78011800 ECX: 00000000 EDX: 00000005
>> [ 0.576666] ESI: 781d8400 EDI: 781d8000 EBP: 78069cd0 ESP: 78069cc8
>> [ 0.576666] ESI: 781d8400 EDI: 781d8000 EBP: 78069cd0 ESP: 78069cc8
>> [ 0.576666] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
>> [ 0.576666] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
>> [ 0.576666] CR0: 8005003b CR2: 000001c4 CR3: 0229f000 CR4: 000006d0
>> [ 0.576666] CR0: 8005003b CR2: 000001c4 CR3: 0229f000 CR4: 000006d0
>> [ 0.576666] Stack:
>> [ 0.576666] Stack:
>> [ 0.576666] 78011800
>> [ 0.576666] 78011800 78011860 78011860 78069d5c 78069d5c 7976c1ac
>> 7976c1ac 00000002 00000002 78069ce8 78069ce8 0000002e 0000002e
>> 00000000 00000000
>>
>> [ 0.576666] 00001100
>> [ 0.576666] 00001100 78011800 78011800 78011860 78011860 781d8000
>> 781d8000 00000000 00000000 00000000 00000000 00000000 00000000
>> 00000000 00000000
>>
>> [ 0.576666] 00000000
>> [ 0.576666] 00000000 00000000 00000000 00000000 00000000 00000000
>> 00000000 00000000 00000000 00000000 00000000 00000000 00000000
>> 00000000 00000000
>>
>> [ 0.576666] Call Trace:
>> [ 0.576666] Call Trace:
>> [ 0.576666] [<7976c1ac>] pci_device_add+0xbc/0x820
>> [ 0.576666] [<7976c1ac>] pci_device_add+0xbc/0x820
>> [ 0.576666] [<7976ca54>] pci_scan_single_device+0x144/0x1c0
>> [ 0.576666] [<7976ca54>] pci_scan_single_device+0x144/0x1c0
>> [ 0.576666] [<7976cb70>] pci_scan_slot+0xa0/0x230
>> [ 0.576666] [<7976cb70>] pci_scan_slot+0xa0/0x230
>> [ 0.576666] [<7976ea6a>] pci_scan_child_bus+0x5a/0x230
>> [ 0.576666] [<7976ea6a>] pci_scan_child_bus+0x5a/0x230
>> [ 0.576666] [<79894626>] ? dev_warn+0x36/0x50
>> [ 0.576666] [<79894626>] ? dev_warn+0x36/0x50
>> [ 0.576666] [<79a48cf5>] pci_acpi_scan_root+0x4c5/0x990
>> [ 0.576666] [<79a48cf5>] pci_acpi_scan_root+0x4c5/0x990
>> [ 0.576666] [<797c9be8>] acpi_pci_root_add+0x4fb/0x64d
>> [ 0.576666] [<797c9be8>] acpi_pci_root_add+0x4fb/0x64d
>> [ 0.576666] [<797be464>] ? acpi_scan_match_handler+0x9d/0x10e
>> [ 0.576666] [<797be464>] ? acpi_scan_match_handler+0x9d/0x10e
>> [ 0.576666] [<797c2a3d>] acpi_bus_attach+0x149/0x381
>> [ 0.576666] [<797c2a3d>] acpi_bus_attach+0x149/0x381
>> [ 0.576666] [<79bd0946>] ? mutex_unlock+0x16/0x30
>> [ 0.576666] [<79bd0946>] ? mutex_unlock+0x16/0x30
>> [ 0.576666] [<7989c2a0>] ? __driver_attach+0x140/0x140
>> [ 0.576666] [<7989c2a0>] ? __driver_attach+0x140/0x140
>> [ 0.576666] [<797c2be5>] acpi_bus_attach+0x2f1/0x381
>> [ 0.576666] [<797c2be5>] acpi_bus_attach+0x2f1/0x381
>> [ 0.576666] [<7989b94d>] ? device_attach+0x6d/0x120
>> [ 0.576666] [<7989b94d>] ? device_attach+0x6d/0x120
>> [ 0.576666] [<7989c2a0>] ? __driver_attach+0x140/0x140
>> [ 0.576666] [<7989c2a0>] ? __driver_attach+0x140/0x140
>> [ 0.576666] [<797c2be5>] acpi_bus_attach+0x2f1/0x381
>> [ 0.576666] [<797c2be5>] acpi_bus_attach+0x2f1/0x381
>> [ 0.576666] [<797c2d06>] acpi_bus_scan+0x91/0xa8
>> [ 0.576666] [<797c2d06>] acpi_bus_scan+0x91/0xa8
>> [ 0.576666] [<7a217b07>] acpi_scan_init+0x137/0x39d
>> [ 0.576666] [<7a217b07>] acpi_scan_init+0x137/0x39d
>> [ 0.576666] [<7a217695>] acpi_init+0x496/0x534
>> [ 0.576666] [<7a217695>] acpi_init+0x496/0x534
>> [ 0.576666] [<7a2171ff>] ? acpi_sleep_proc_init+0x5b/0x5b
>> [ 0.576666] [<7a2171ff>] ? acpi_sleep_proc_init+0x5b/0x5b
>> [ 0.576666] [<790005ae>] do_one_initcall+0x16e/0x3c0
>> [ 0.576666] [<790005ae>] do_one_initcall+0x16e/0x3c0
>> [ 0.576666] [<7a2171ff>] ? acpi_sleep_proc_init+0x5b/0x5b
>> [ 0.576666] [<7a2171ff>] ? acpi_sleep_proc_init+0x5b/0x5b
>> [ 0.576666] [<7a1b8afe>] kernel_init_freeable+0x263/0x3e4
>> [ 0.576666] [<7a1b8afe>] kernel_init_freeable+0x263/0x3e4
>> [ 0.576666] [<79bb7c49>] kernel_init+0x19/0x200
>> [ 0.576666] [<79bb7c49>] kernel_init+0x19/0x200
>> [ 0.576666] [<79bd5d01>] ret_from_kernel_thread+0x21/0x30
>> [ 0.576666] [<79bd5d01>] ret_from_kernel_thread+0x21/0x30
>> [ 0.576666] [<79bb7c30>] ? rest_init+0x180/0x180
>> [ 0.576666] [<79bb7c30>] ? rest_init+0x180/0x180
>> [ 0.576666] Code:
>> [ 0.576666] Code: 80 80 5c 5c c1 c1 7a 7a 01 01 89 89 5d 5d f8 f8 89
>> 89 c3 c3 89 89 75 75 fc fc 83 83 15 15 84 84 5c 5c c1 c1 7a 7a 00 00
>> e8 e8 df df ec ec d4 d4 ff ff 83 83 05 05 88 88 5c 5c c1 c1 7a 7a 01
>> 01 83 83 15 15 8c 8c 5c 5c c1 c1 7a 7a 00 00 89 89 c6 c6 8b 8b 00
>> 00<8b> <8b> 90 90 c4 c4 01 01 00 00 00 00 8d 8d 43 43 60 60 e8 e8 1f
>> 1f 94 94 ff ff ff ff 89 89 f0 f0 83 83 05 05 90 90 5c 5c c1 c1
>>
>> [ 0.576666] EIP: [<79a20c33>]
>> [ 0.576666] EIP: [<79a20c33>]
>> of_pci_dma_configure+0x33/0x70of_pci_dma_configure+0x33/0x70 SS:ESP
>> 0068:78069cc8
>> SS:ESP 0068:78069cc8
>> [ 0.576666] CR2: 00000000000001c4
>> [ 0.576666] CR2: 00000000000001c4
>> [ 0.576666] ---[ end trace af448c13c817976d ]---
>> [ 0.576666] ---[ end trace af448c13c817976d ]---
>>
>> git bisect start f20f4567bfc741f16e0895f4c4e845e7c51e6818
>> 13a7a6ac0a11197edcd0f756a035f472b42cdf8b --
>> git bisect good 6a85284cccce49f687a505a7952fa3889b82628d # 16:02 20+
>> 19 Merge 'kees/yama/tip' into devel-hourly-2015030422
>> git bisect bad e85ea728632a20c9830cbc5c67d64f8a302b452e # 16:05 0- 20
>> Merge 'tip/x86/asm' into devel-hourly-2015030422
>> git bisect bad 0516a34d518ed4a1ae4261736d6678094fd46142 # 16:11 0- 20
>> Merge 'spi/for-next' into devel-hourly-2015030422
>> git bisect bad d8ee2cead70b0d04c58d1a57299fe307f5616b7e # 16:49 0- 20
>> Merge 'sound/topic/hda-unbind' into devel-hourly-2015030422
>> git bisect bad ccbd4806f70ac1599934b7c17582f44af02edca8 # 17:09 0- 20
>> Merge 'perf/tmp.perf/trace_ordered_events' into devel-hourly-2015030422
>> git bisect good a8c718ae516eeb6366d899bae02ebb409ced5453 # 17:12 20+ 0
>> Merge 'mripard/sunxi/dt-for-4.1' into devel-hourly-2015030422
>> git bisect bad 941b9d9416bbace6161718d173a526f9dfd10762 # 17:14 0- 20
>> Merge 'pci/pci/murali-v8' into devel-hourly-2015030422
>> git bisect good 6675a601d72be408025e675599702e30a99188aa # 17:19 20+
>> 16 PCI: Add helper functions pci_get[put]_host_bridge_device()
>> git bisect bad 0b2af171520e5d5e7d5b5f479b90a6a5014d9df6 # 17:21 0- 20
>> PCI: Update DMA configuration from DT
>> git bisect good bdc567f9c1cb6a61100471afc95ee6200f0ba043 # 17:24 20+ 7
>> of/pci: Add of_pci_dma_configure() to update DMA configuration
>> # first bad commit: [0b2af171520e5d5e7d5b5f479b90a6a5014d9df6] PCI:
>> Update DMA configuration from DT
>> git bisect good bdc567f9c1cb6a61100471afc95ee6200f0ba043 # 17:27 60+
>> 33 of/pci: Add of_pci_dma_configure() to update DMA configuration
>> # extra tests with DEBUG_INFO
>> git bisect bad 0b2af171520e5d5e7d5b5f479b90a6a5014d9df6 # 17:40 0- 60
>> PCI: Update DMA configuration from DT
>> # extra tests on HEAD of linux-devel/devel-hourly-2015030422
>> git bisect bad f20f4567bfc741f16e0895f4c4e845e7c51e6818 # 17:41 0- 12
>> 0day head guard for 'devel-hourly-2015030422'
>> # extra tests on tree/branch pci/pci/murali-v8
>> git bisect bad da5cc6061aae665cc15835519838861437b9fdc7 # 17:56 0- 60
>> of: Calculate device DMA masks based on DT dma-range size
>> # extra tests with first bad commit reverted
>> # extra tests on tree/branch linus/master
>> git bisect good 6587457b4b3d663b237a0f95ddf6e67d1828c8ea # 18:08 60+
>> 60 Merge tag 'dma-buf-for-4.0-rc3' of
>> git://git.kernel.org/pub/scm/linux/kernel/git/sumits/dma-buf
>> # extra tests on tree/branch next/master
>>
>>
>> This script may reproduce the error.
>>
>> ----------------------------------------------------------------------------
>>
>> #!/bin/bash
>>
>> kernel=$1
>>
>> kvm=(
>> qemu-system-x86_64
>> -cpu kvm64
>> -enable-kvm
>> -kernel $kernel
>> -m 320
>> -smp 2
>> -net nic,vlan=1,model=e1000
>> -net user,vlan=1
>> -boot order=nc
>> -no-reboot
>> -watchdog i6300esb
>> -rtc base=localtime
>> -serial stdio
>> -display none
>> -monitor null
>> )
>>
>> append=(
>> hung_task_panic=1
>> earlyprintk=ttyS0,115200
>> rd.udev.log-priority=err
>> systemd.log_target=journal
>> systemd.log_level=warning
>> debug
>> apic=debug
>> sysrq_always_enabled
>> rcupdate.rcu_cpu_stall_timeout=100
>> panic=-1
>> softlockup_panic=1
>> nmi_watchdog=panic
>> oops=panic
>> load_ramdisk=2
>> prompt_ramdisk=0
>> console=ttyS0,115200
>> console=tty0
>> vga=normal
>> root=/dev/ram0
>> rw
>> drbd.minor_count=8
>> )
>>
>> "${kvm[@]}" --append "${append[*]}"
>> ----------------------------------------------------------------------------
>>
>>
>> Thanks,
>> Fengguang
> Fengguang,
>
> Could you or someone point me to the DT file for this platform? I looked
> at the config file and it has CONFIG_OF enabled. Wondering if it has
> dma-ranges defined? This series was tested on ARM platforms that uses
> dma-ranges. If someone can point me to the DT file, this will give me a
> clue on what is going on here.
>
Bjorn,

Looks like there is a NULL being encountered (either root bridge or root 
bridge's parent) in the patch. I have added check for this and attached 
a debug patch. Can this be applied so that we can look at the boot log 
for clue? Meanwhile if someone can point me to the DTS for this 
platform, that will help to debug this.

I am assuming dma-ranges is not defined. So one of these could be NULL. 
I am not sure why it could be NULL on this platform though. Any clue?

Murali

-- 
Murali Karicheri
Linux Kernel, Texas Instruments

View attachment "0001-pci-of-fix-kernel-crash.patch" of type "text/x-diff" (1587 bytes)

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