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Date: Thu, 01 Sep 2016 05:05:53 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc: lkp@...org, LKML <linux-kernel@...r.kernel.org>,
Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [ppdev] 8b7d3a9d90: WARNING: CPU: 0 PID: 153 at
fs/sysfs/dir.c:31 sysfs_warn_dup+0x62/0x80
FYI, we noticed the following commit:
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git char-misc-testing
commit 8b7d3a9d903ee1d1f5febc8e74223e4e72720e35 ("ppdev: use new parport device model")
in testcase: boot
on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 4G
caused below changes:
+---------------------------------------------------------+------------+------------+
| | 5ed22cebba | 8b7d3a9d90 |
+---------------------------------------------------------+------------+------------+
| boot_successes | 0 | 19 |
| boot_failures | 1 | 8 |
| BUG:kernel_reboot-without-warning_in_test_stage | 1 | |
| message:BUG:kernel_reboot-without-warning_in_test_stage | 0 | |
| pattern:BUG:kernel_reboot-without-warning_in_test_stage | 0 | |
| WARNING:at_fs/sysfs/dir.c:#sysfs_warn_dup | 0 | 8 |
| message:WARNING:at_fs/sysfs/dir.c:#sysfs_warn_dup | 0 | 0.0 |
| pattern:WARNING:at_fs/sysfs/dir.c:#sysfs_warn_dup | 0 | 0.0 |
| calltrace:parport_pc_init | 0 | 8 |
| message:calltrace:parport_pc_init | 0 | 0.0 |
| pattern:calltrace:parport_pc_init | 0 | 0 |
| calltrace:SyS_finit_module | 0 | 8 |
| message:calltrace:SyS_finit_module | 0 | 0.0 |
| pattern:calltrace:SyS_finit_module | 0 | 0 |
| WARNING:at_lib/kobject.c:#kobject_add_internal | 0 | 8 |
| message:WARNING:at_lib/kobject.c:#kobject_add_internal | 0 | 0.0 |
| pattern:WARNING:at_lib/kobject.c:#kobject_add_internal | 0 | 0.0 |
+---------------------------------------------------------+------------+------------+
[ 8.347735] blk_update_request: I/O error, dev fd0, sector 0
[ 8.349231] floppy: error -5 while reading block 0
[ 8.350671] ------------[ cut here ]------------
[ 8.352075] WARNING: CPU: 0 PID: 153 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x62/0x80
[ 8.354659] sysfs: cannot create duplicate filename '/devices/pnp0/00:04/ppdev/parport0'
[ 8.357017] Modules linked in: ppdev snd_pcm snd_timer crc32c_intel snd soundcore
[ 8.358738] ata2.01: NODEV after polling detection
[ 8.359071] ata2.00: ATAPI: QEMU DVD-ROM, 2.5+, max UDMA/100
[ 8.359795] ata2.00: configured for MWDMA2
[ 8.363714] floppy pcspkr parport_pc(+) serio_raw ata_piix parport libata i2c_piix4 acpi_cpufreq
[ 8.367797] CPU: 0 PID: 153 Comm: systemd-udevd Not tainted 4.8.0-rc2-00102-g8b7d3a9 #1
[ 8.370307] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 8.370387] Kernel tests: Boot OK!
[ 8.374113] 0000000000000000 ffff88010f0cb740 ffffffff8144bb29 ffff88010f0cb790
[ 8.376739] 0000000000000000 ffff88010f0cb780 ffffffff8107e6ab 0000001f0dd7d000
[ 8.379427] ffff88010dd7d000 ffff88010f377110 ffff88010fab69d8 ffff88010fb4f400
[ 8.382066] Call Trace:
[ 8.383085] [<ffffffff8144bb29>] dump_stack+0x63/0x8a
[ 8.384557] [<ffffffff8107e6ab>] __warn+0xcb/0xf0
[ 8.385924] [<ffffffff8107e71f>] warn_slowpath_fmt+0x4f/0x60
[ 8.387368] [<ffffffff8128f1c2>] sysfs_warn_dup+0x62/0x80
[ 8.388780] [<ffffffff8128f2a7>] sysfs_create_dir_ns+0x77/0x90
[ 8.390282] [<ffffffff8144e829>] kobject_add_internal+0xa9/0x320
[ 8.391840] [<ffffffff81457ff3>] ? vsnprintf+0x1e3/0x4d0
[ 8.393256] [<ffffffff8144eb08>] kobject_add+0x68/0xb0
[ 8.394618] [<ffffffff8192bec5>] ? mutex_lock+0x25/0x50
[ 8.395973] [<ffffffff815a5c75>] device_add+0x165/0x630
[ 8.397377] [<ffffffff8119fd61>] ? kfree_const+0x21/0x30
[ 8.398804] [<ffffffff815a6330>] device_create_groups_vargs+0xe0/0xf0
[ 8.400490] [<ffffffffa0079060>] ? dead_read+0x10/0x10 [parport]
[ 8.402022] [<ffffffff815a63a1>] device_create+0x41/0x50
[ 8.403977] [<ffffffff81920b7d>] ? klist_next+0x7d/0x100
[ 8.405376] [<ffffffffa000b0b2>] pp_attach+0x32/0x40 [ppdev]
[ 8.406934] [<ffffffffa0079077>] driver_check+0x17/0x20 [parport]
[ 8.408462] [<ffffffff815a6ecb>] bus_for_each_drv+0x5b/0x90
[ 8.409894] [<ffffffffa0079499>] attach_driver_chain+0x59/0x60 [parport]
[ 8.411537] [<ffffffffa007a7e7>] parport_announce_port+0xc7/0x110 [parport]
[ 8.413173] [<ffffffffa00a3f96>] parport_pc_probe_port+0x6f6/0xca0 [parport_pc]
[ 8.415531] [<ffffffff815a511c>] ? __dev_printk+0x3c/0x80
[ 8.416999] [<ffffffff815a54ac>] ? _dev_info+0x5c/0x60
[ 8.418499] [<ffffffffa00a48f3>] parport_pc_pnp_probe+0x143/0x1e0 [parport_pc]
[ 8.420721] [<ffffffffa00a47b0>] ? parport_pc_pci_probe+0x270/0x270 [parport_pc]
[ 8.422979] [<ffffffff81524865>] pnp_device_probe+0x65/0xc0
[ 8.424555] [<ffffffff815a9323>] driver_probe_device+0x223/0x430
[ 8.426088] [<ffffffff815a960f>] __driver_attach+0xdf/0xf0
[ 8.427541] [<ffffffff815a9530>] ? driver_probe_device+0x430/0x430
[ 8.429072] [<ffffffff815a6e10>] bus_for_each_dev+0x60/0xa0
[ 8.430502] [<ffffffff815a8a5e>] driver_attach+0x1e/0x20
[ 8.431988] [<ffffffff815a84a0>] bus_add_driver+0x170/0x270
[ 8.433549] [<ffffffff815a9f30>] driver_register+0x60/0xe0
[ 8.435027] [<ffffffff815246a0>] pnp_register_driver+0x20/0x30
[ 8.436486] [<ffffffffa00ab36c>] parport_pc_init+0x2b4/0xf48 [parport_pc]
[ 8.438179] [<ffffffffa00ab0b8>] ? parport_parse_param+0xb8/0xb8 [parport_pc]
[ 8.442285] [<ffffffff8100217d>] do_one_initcall+0x3d/0x150
[ 8.443818] [<ffffffff810a4a79>] ? __might_sleep+0x49/0x80
[ 8.445245] [<ffffffff811e68f3>] ? kmem_cache_alloc_trace+0x163/0x1b0
[ 8.446831] [<ffffffff8117b3e0>] do_init_module+0x5f/0x1ef
[ 8.448350] [<ffffffff811092a9>] load_module+0x1439/0x1b50
[ 8.449791] [<ffffffff81105e50>] ? __symbol_put+0x40/0x40
[ 8.451268] [<ffffffff81212f93>] ? kernel_read_file+0x1a3/0x1c0
[ 8.452766] [<ffffffff81213069>] ? kernel_read_file_from_fd+0x49/0x80
Thanks,
Kernel Test Robot
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