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Message-ID: <CAPcyv4j0syAsinM-KbeefKysJhM9zt6kvrX=0c2HrtPV_tRAHQ@mail.gmail.com>
Date: Sat, 4 Feb 2017 12:36:14 -0800
From: Dan Williams <dan.j.williams@...el.com>
To: kernel test robot <xiaolong.ye@...el.com>
Cc: Jens Axboe <axboe@...com>,
James Bottomley <James.Bottomley@...senpartnership.com>,
Bart Van Assche <bart.vanassche@...disk.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Jan Kara <jack@...e.cz>, Omar Sandoval <osandov@...ndov.com>,
Omar Sandoval <osandov@...com>, Christoph Hellwig <hch@....de>,
LKML <linux-kernel@...r.kernel.org>,
Jens Axboe <axboe@...nel.dk>, LKP <lkp@...org>
Subject: Re: [lkp-robot] [scsi, block] 0dba1314d4: WARNING:at_fs/sysfs/dir.c:#sysfs_warn_dup
On Fri, Feb 3, 2017 at 11:09 PM, kernel test robot
<xiaolong.ye@...el.com> wrote:
>
> FYI, we noticed the following commit:
>
> commit: 0dba1314d4f81115dce711292ec7981d17231064 ("scsi, block: fix duplicate bdi name registration crashes")
> https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-4.11/next
>
> in testcase: boot
>
> on test machine: qemu-system-i386 -enable-kvm -cpu Haswell,+smep,+smap -m 360M
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
> +----------------------------------------------+------------+------------+
> | | efa7c9f97e | 0dba1314d4 |
> +----------------------------------------------+------------+------------+
> | boot_successes | 0 | 0 |
> | boot_failures | 6 | 6 |
> | WARNING:at_include/linux/kref.h:#kobject_get | 6 | 6 |
> | BUG:workqueue_lockup-pool | 2 | |
> | WARNING:at_fs/sysfs/dir.c:#sysfs_warn_dup | 0 | 6 |
> +----------------------------------------------+------------+------------+
>
>
>
> [ 8.820258] ------------[ cut here ]------------
> [ 8.821188] WARNING: CPU: 0 PID: 1 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x58/0x70
> [ 8.822994] sysfs: cannot create duplicate filename '/class/scsi_disk/0:0:0:0'
> [ 8.824567] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 4.10.0-rc5-00097-g0dba131 #1
> [ 8.826275] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
> [ 8.828156] Call Trace:
> [ 8.828851] dump_stack+0x79/0xa4
> [ 8.829628] __warn+0xd2/0xf0
> [ 8.830372] ? sysfs_warn_dup+0x58/0x70
> [ 8.831211] warn_slowpath_fmt+0x36/0x40
> [ 8.832054] sysfs_warn_dup+0x58/0x70
> [ 8.832865] sysfs_do_create_link_sd+0x9e/0xb0
> [ 8.833844] sysfs_create_link+0x20/0x40
> [ 8.834714] device_add+0x218/0x610
> [ 8.835511] ? kvasprintf_const+0x49/0x60
> [ 8.836352] ? kobject_set_name_vargs+0x62/0x80
> [ 8.837253] sd_probe+0x31a/0x390
> [ 8.838027] ? _raw_spin_unlock+0x1d/0x30
> [ 8.838884] driver_probe_device+0x190/0x4a0
> [ 8.839751] __device_attach_driver+0x6f/0x100
> [ 8.840736] ? klist_next+0x6e/0x100
> [ 8.841538] ? __driver_attach+0xf0/0xf0
> [ 8.842383] bus_for_each_drv+0x47/0x80
> [ 8.843226] __device_attach+0xa8/0x120
> [ 8.844062] ? __driver_attach+0xf0/0xf0
> [ 8.844902] device_initial_probe+0xd/0x10
> [ 8.845754] bus_probe_device+0x77/0x80
> [ 8.846593] device_add+0x320/0x610
> [ 8.847387] scsi_sysfs_add_sdev+0x85/0x2b0
> [ 8.848246] ? scsi_attach_vpd+0x1f9/0x210
> [ 8.849103] scsi_probe_and_add_lun+0xd44/0xe70
> [ 8.850021] __scsi_scan_target+0xd8/0x690
> [ 8.850918] ? __pm_runtime_resume+0x37/0x80
> [ 8.852124] scsi_scan_channel+0x8f/0xb0
> [ 8.852977] scsi_scan_host_selected+0x100/0x180
> [ 8.853885] do_scsi_scan_host+0x8a/0x90
> [ 8.854733] scsi_scan_host+0x15a/0x1a0
> [ 8.855562] sdebug_driver_probe+0x14f/0x3d0
> [ 8.856435] ? _raw_spin_unlock+0x1d/0x30
> [ 8.857270] ? devices_kset_move_last+0x71/0xc0
> [ 8.858170] ? sysfs_create_link+0x20/0x40
> [ 8.859057] driver_probe_device+0xd4/0x4a0
> [ 8.859924] __device_attach_driver+0x6f/0x100
> [ 8.860814] ? klist_next+0x6e/0x100
> [ 8.861619] ? __driver_attach+0xf0/0xf0
> [ 8.862470] bus_for_each_drv+0x47/0x80
> [ 8.863298] __device_attach+0xa8/0x120
> [ 8.864131] ? __driver_attach+0xf0/0xf0
> [ 8.864975] device_initial_probe+0xd/0x10
> [ 8.865831] bus_probe_device+0x77/0x80
> [ 8.866704] device_add+0x320/0x610
> [ 8.867497] ? pm_runtime_init+0xea/0xf0
> [ 8.868326] device_register+0x12/0x20
> [ 8.869146] sdebug_add_adapter+0xda/0x1e0
> [ 8.870002] ? driver_register+0x83/0xe0
> [ 8.870847] scsi_debug_init+0x5a0/0x6eb
> [ 8.871686] ? kobject_uevent+0xa/0x10
> [ 8.872507] ? driver_register+0x83/0xe0
> [ 8.873336] ? scsi_register_driver+0xf/0x20
> [ 8.874218] ? init_ch_module+0x9d/0x9d
> [ 8.875088] do_one_initcall+0x7b/0x132
> [ 8.875918] ? kernel_init_freeable+0xe7/0x188
> [ 8.876807] kernel_init_freeable+0x10a/0x188
> [ 8.877690] ? rest_init+0xb0/0xb0
> [ 8.878482] kernel_init+0xb/0x100
> [ 8.879262] ? schedule_tail+0xc/0x70
> [ 8.880076] ? rest_init+0xb0/0xb0
> [ 8.880861] ret_from_fork+0x21/0x2c
> [ 8.881688] ---[ end trace 62a20110376b9cdf ]---
>
>
> To reproduce:
>
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email
These reproduction steps don't work for me. I also notice that 0day
is picking up on a later error, the real error is that we register to
scsi devices with the same name:
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