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Date: Mon, 9 Dec 2019 22:06:23 -0700
From: Jens Axboe <axboe@...nel.dk>
To: kernel test robot <rong.a.chen@...el.com>,
Logan Gunthorpe <logang@...tatee.com>
Cc: Christoph Hellwig <hch@....de>,
LKML <linux-kernel@...r.kernel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
lkp@...ts.01.org
Subject: Re: [block] 48d9b0d431: BUG:kernel_NULL_pointer_dereference,address
Logan,
Are you looking into this one?
On 12/8/19 8:40 AM, kernel test robot wrote:
> FYI, we noticed the following commit (built with gcc-7):
>
> commit: 48d9b0d43105e0da2b7c135eedd24e51234fb5e4 ("block: account statistics for passthrough requests")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
> in testcase: rcuperf
> with following parameters:
>
> runtime: 300s
> perf_type: tasks
>
>
>
> on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +-------------------------------------------------------+------------+------------+
> | | 8148f0b564 | 48d9b0d431 |
> +-------------------------------------------------------+------------+------------+
> | boot_successes | 8 | 0 |
> | boot_failures | 0 | 8 |
> | BUG:kernel_NULL_pointer_dereference,address | 0 | 8 |
> | Oops:#[##] | 0 | 8 |
> | EIP:blk_account_io_completion | 0 | 8 |
> | EIP:ide_output_data | 0 | 8 |
> | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 8 |
> +-------------------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <rong.a.chen@...el.com>
>
>
> [ 14.392111] BUG: kernel NULL pointer dereference, address: 000002ac
> [ 14.392607] #PF: supervisor write access in kernel mode
> [ 14.392607] #PF: error_code(0x0002) - not-present page
> [ 14.392607] *pde = 00000000
> [ 14.392607] Oops: 0002 [#1]
> [ 14.392607] CPU: 0 PID: 237 Comm: kworker/0:1H Not tainted 5.4.0-rc2-00011-g48d9b0d43105e #1
> [ 14.392607] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
> [ 14.392607] Workqueue: kblockd drive_rq_insert_work
> [ 14.392607] EIP: blk_account_io_completion+0x7a/0xf0
> [ 14.392607] Code: 89 54 24 08 31 d2 89 4c 24 04 31 c9 c7 04 24 02 00 00 00 c1 ee 09 e8 f5 21 a6 ff e8 70 5c a7 ff 8b 53 60 8d 04 bd 00 00 00 00 <01> b4 02 ac 02 00 00 8b 9a 88 02 00 00 85 db 74 11 85 d2 74 51 8b
> [ 14.392607] EAX: 00000000 EBX: f5b80000 ECX: 00000000 EDX: 00000000
> [ 14.392607] ESI: 00000000 EDI: 00000000 EBP: f3031e70 ESP: f3031e54
> [ 14.392607] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010046
> [ 14.392607] CR0: 80050033 CR2: 000002ac CR3: 03c25000 CR4: 000406d0
> [ 14.392607] Call Trace:
> [ 14.392607] <IRQ>
> [ 14.392607] ? blk_account_io_completion+0x38/0xf0
> [ 14.392607] blk_update_request+0x85/0x420
> [ 14.392607] ? _raw_spin_unlock_irqrestore+0x4f/0x60
> [ 14.392607] ? trace_hardirqs_off+0xca/0xe0
> [ 14.392607] ? _raw_spin_unlock_irqrestore+0x4f/0x60
> [ 14.392607] ? complete+0x41/0x50
> [ 14.392607] ide_end_rq+0x38/0xa0
> [ 14.392607] ide_complete_rq+0x3d/0x70
> [ 14.392607] cdrom_newpc_intr+0x258/0xba0
> [ 14.392607] ? find_held_lock+0x2f/0xa0
> [ 14.392607] ? cdrom_analyze_sense_data+0x1b0/0x1b0
> [ 14.392607] ide_intr+0x135/0x250
> [ 14.392607] __handle_irq_event_percpu+0x3e/0x250
> [ 14.392607] handle_irq_event_percpu+0x1f/0x50
> [ 14.392607] handle_irq_event+0x32/0x60
> [ 14.392607] ? handle_fasteoi_irq+0x160/0x160
> [ 14.392607] handle_level_irq+0x6c/0x110
> [ 14.392607] handle_irq+0x72/0xa0
> [ 14.392607] </IRQ>
> [ 14.392607] do_IRQ+0x45/0xad
> [ 14.392607] common_interrupt+0x115/0x11c
> [ 14.392607] EIP: ide_output_data+0xb7/0x140
> [ 14.392607] Code: 00 00 00 0f b7 03 66 89 07 83 c3 02 39 d3 75 f3 83 c4 14 5b 5e 5f 5d c3 8d 76 00 8b 4d ec d1 e9 80 7d f0 00 75 15 89 de 89 fa <f3> 66 6f 83 c4 14 5b 5e 5f 5d c3 8d b6 00 00 00 00 85 c9 74 ee 49
> [ 14.392607] EAX: 00000000 EBX: f5b800ac ECX: 00000000 EDX: 00000170
> [ 14.392607] ESI: f5b800b8 EDI: 00000170 EBP: f6a57dac ESP: f6a57d8c
> [ 14.392607] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010246
> [ 14.392607] ? print_usage_bug+0x9b/0x1f0
> [ 14.392607] ? ide_output_data+0xb7/0x140
> [ 14.392607] ? ide_set_handler+0x42/0x50
> [ 14.392607] ide_transfer_pc+0x11c/0x2a0
> [ 14.392607] ? ide_check_atapi_device+0x130/0x130
> [ 14.392607] ? ide_pc_intr+0x3d0/0x3d0
> [ 14.392607] ide_issue_pc+0x160/0x250
> [ 14.392607] ? ide_check_atapi_device+0x130/0x130
> [ 14.392607] ide_cd_do_request+0x18e/0x3d0
> [ 14.392607] ide_issue_rq+0x13a/0x6a0
> [ 14.392607] ? _raw_spin_unlock_irq+0x22/0x30
> [ 14.392607] ? lockdep_hardirqs_on+0xe4/0x190
> [ 14.392607] ? _raw_spin_unlock_irq+0x22/0x30
> [ 14.392607] ? trace_hardirqs_on+0x38/0xe0
> [ 14.392607] ? drive_rq_insert_work+0x7a/0xf0
> [ 14.392607] drive_rq_insert_work+0x8a/0xf0
> [ 14.392607] process_one_work+0x207/0x500
> [ 14.392607] ? process_one_work+0x16b/0x500
> [ 14.392607] worker_thread+0x39/0x400
> [ 14.392607] kthread+0xee/0x110
> [ 14.392607] ? process_one_work+0x500/0x500
> [ 14.392607] ? kthread_create_on_node+0x30/0x30
> [ 14.392607] ret_from_fork+0x1e/0x28
> [ 14.392607] Modules linked in:
> [ 14.392607] CR2: 00000000000002ac
> [ 14.392607] ---[ end trace 2efe0b990b41cd59 ]---
>
>
> To reproduce:
>
> # build kernel
> cd linux
> cp config-5.4.0-rc2-00011-g48d9b0d43105e .config
> make HOSTCC=gcc-7 CC=gcc-7 ARCH=i386 olddefconfig prepare modules_prepare bzImage
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
>
>
>
> Thanks,
> Rong Chen
>
--
Jens Axboe
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