Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753252AbcLLUsW (ORCPT ); Mon, 12 Dec 2016 15:48:22 -0500 Received: from mail-wm0-f54.google.com ([74.125.82.54]:33935 "EHLO mail-wm0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752894AbcLLUsU (ORCPT ); Mon, 12 Dec 2016 15:48:20 -0500 MIME-Version: 1.0 From: Andrey Konovalov Date: Mon, 12 Dec 2016 21:48:18 +0100 Message-ID: Subject: usb/core: warning in usb_create_ep_devs/sysfs_create_dir_ns To: Greg Kroah-Hartman , USB list , LKML , Alan Stern Cc: Dmitry Vyukov , Kostya Serebryany , syzkaller Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3312 Lines: 60 Hi! While running the syzkaller fuzzer I've got the following error report. On commit 3c49de52d5647cda8b42c4255cf8a29d1e22eff5 (Dev 2). WARNING: CPU: 2 PID: 865 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x8a/0xa0 gadgetfs: disconnected sysfs: cannot create duplicate filename '/devices/platform/dummy_hcd.0/usb2/2-1/2-1:64.0/ep_05' Kernel panic - not syncing: panic_on_warn set ... CPU: 2 PID: 865 Comm: kworker/2:1 Not tainted 4.9.0-rc7+ #34 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 Workqueue: usb_hub_wq hub_event ffff88006bee64c8 ffffffff81f96b8a ffffffff00000001 1ffff1000d7dcc2c ffffed000d7dcc24 0000000000000001 0000000041b58ab3 ffffffff8598b510 ffffffff81f968f8 ffffffff850fee20 ffffffff85cff020 dffffc0000000000 Call Trace: [< inline >] __dump_stack lib/dump_stack.c:15 [] dump_stack+0x292/0x398 lib/dump_stack.c:51 [] panic+0x1cb/0x3a9 kernel/panic.c:179 [] __warn+0x1c4/0x1e0 kernel/panic.c:542 [] warn_slowpath_fmt+0xc5/0x110 kernel/panic.c:565 [] sysfs_warn_dup+0x8a/0xa0 fs/sysfs/dir.c:30 [] sysfs_create_dir_ns+0x178/0x1d0 fs/sysfs/dir.c:59 [< inline >] create_dir lib/kobject.c:71 [] kobject_add_internal+0x227/0xa60 lib/kobject.c:229 [< inline >] kobject_add_varg lib/kobject.c:366 [] kobject_add+0x139/0x220 lib/kobject.c:411 [] device_add+0x353/0x1660 drivers/base/core.c:1088 [] device_register+0x1d/0x20 drivers/base/core.c:1206 [] usb_create_ep_devs+0x163/0x260 drivers/usb/core/endpoint.c:195 [] create_intf_ep_devs+0x13b/0x200 drivers/usb/core/message.c:1030 [] usb_set_configuration+0x1083/0x18d0 drivers/usb/core/message.c:1937 [] generic_probe+0x6e/0xe0 drivers/usb/core/generic.c:172 [] usb_probe_device+0xaa/0xe0 drivers/usb/core/driver.c:263 [< inline >] really_probe drivers/base/dd.c:375 [] driver_probe_device+0x514/0x980 drivers/base/dd.c:515 [] __device_attach_driver+0x22b/0x290 drivers/base/dd.c:610 [] bus_for_each_drv+0x15c/0x200 drivers/base/bus.c:463 [] __device_attach+0x266/0x3c0 drivers/base/dd.c:667 [] device_initial_probe+0x1a/0x20 drivers/base/dd.c:714 [] bus_probe_device+0x1e6/0x290 drivers/base/bus.c:557 [] device_add+0xd06/0x1660 drivers/base/core.c:1136 [] usb_new_device+0x9af/0x1e80 drivers/usb/core/hub.c:2508 [< inline >] hub_port_connect drivers/usb/core/hub.c:4891 [< inline >] hub_port_connect_change drivers/usb/core/hub.c:4996 [< inline >] port_event drivers/usb/core/hub.c:5102 [] hub_event+0x1689/0x36d0 drivers/usb/core/hub.c:5182 [] process_one_work+0xb2a/0x1aa0 kernel/workqueue.c:2096 [] worker_thread+0x20f/0x18a0 kernel/workqueue.c:2230 [] kthread+0x323/0x3e0 kernel/kthread.c:209 [] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:433 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled