KCSAN: data-race in dev_uevent / really

KCSAN: data-race in dev_uevent / really_probe (3)
Status: moderation: reported on 2020/12/07 11:38
Reported-by: syzbot+d8ff3efb82af55a2745d@syzkaller.appspotmail.com
First crash: 109d, last: 31d

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in dev_uevent / really_probe				1	261d	261d	0/17	auto-closed as invalid on 2020/06/18 13:13
upstream	KCSAN: data-race in dev_uevent / really_probe (2)				3	180d	194d	0/17	auto-closed as invalid on 2020/09/01 14:47

Sample crash report:

==================================================================
BUG: KCSAN: data-race in dev_uevent / really_probe

write to 0xffff88802b07d898 of 8 bytes by task 7 on cpu 0:
 really_probe+0xe2/0xb70 drivers/base/dd.c:535
 driver_probe_device+0xcc/0x120 drivers/base/dd.c:745
 __device_attach_driver+0x255/0x290 drivers/base/dd.c:851
 bus_for_each_drv+0xd8/0x140 drivers/base/bus.c:431
 __device_attach+0x1a0/0x290 drivers/base/dd.c:919
 device_initial_probe+0x16/0x20 drivers/base/dd.c:966
 bus_probe_device+0x7a/0x140 drivers/base/bus.c:491
 device_add+0xcb2/0xe50 drivers/base/core.c:3091
 usb_set_configuration+0x10cd/0x13b0 drivers/usb/core/message.c:2164
 usb_generic_driver_probe+0x54/0xd0 drivers/usb/core/generic.c:238
 usb_probe_device+0xfb/0x1a0 drivers/usb/core/driver.c:293
 really_probe+0x4ee/0xb70 drivers/base/dd.c:565
 driver_probe_device+0xcc/0x120 drivers/base/dd.c:745
 __device_attach_driver+0x255/0x290 drivers/base/dd.c:851
 bus_for_each_drv+0xd8/0x140 drivers/base/bus.c:431
 __device_attach+0x1a0/0x290 drivers/base/dd.c:919
 device_initial_probe+0x16/0x20 drivers/base/dd.c:966
 bus_probe_device+0x7a/0x140 drivers/base/bus.c:491
 device_add+0xcb2/0xe50 drivers/base/core.c:3091
 usb_new_device+0x719/0xc80 drivers/usb/core/hub.c:2555
 hub_port_connect drivers/usb/core/hub.c:5223 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5363 [inline]
 port_event drivers/usb/core/hub.c:5509 [inline]
 hub_event+0x1d25/0x2b60 drivers/usb/core/hub.c:5591
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 process_scheduled_works kernel/workqueue.c:2337 [inline]
 worker_thread+0x7ef/0xb90 kernel/workqueue.c:2423
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

read to 0xffff88802b07d898 of 8 bytes by task 4888 on cpu 1:
 dev_uevent+0x213/0x350 drivers/base/core.c:2053
 uevent_show+0x10e/0x1f0 drivers/base/core.c:2125
 dev_attr_show+0x35/0x90 drivers/base/core.c:1827
 sysfs_kf_seq_show+0x152/0x270 fs/sysfs/file.c:61
 kernfs_seq_show+0x74/0x80 fs/kernfs/file.c:167
 seq_read_iter+0x2d8/0x8e0 fs/seq_file.c:227
 seq_read+0x221/0x260 fs/seq_file.c:159
 kernfs_fop_read+0xce/0x2f0 fs/kernfs/file.c:251
 vfs_read+0x154/0x5c0 fs/read_write.c:494
 ksys_read+0xce/0x180 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:642
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4888 Comm: systemd-journal Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (13):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2020/12/24 09:09	upstream	58cf05f5	c2c1d1dd	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/12/12 10:31	upstream	7f376f19	bca53db9	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/12/10 15:58	upstream	a2f5ea9e	2a55c22b	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/11/28 09:10	upstream	c84e1efa	486f93ef	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/11/19 17:46	upstream	c2e7554e	0767f13f	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/11/17 17:30	upstream	9c87c9f4	bd2a760b	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/11/16 22:13	upstream	09162bc3	1bf9a662	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/11/12 11:59	upstream	3d5e28bf	77a55c8e	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/11/12 01:46	upstream	3d5e28bf	cca87986	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/11/02 03:51	upstream	31f02006	8bc4594f	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/10/26 05:22	upstream	986b9eac	a1839e81	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/10/17 07:53	upstream	54a4c789	6e262c73	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org
ci2-upstream-kcsan-gce	2020/10/07 15:00	upstream	c85fb28b	1880b4a9	.config	log	report	info	gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, rafael@kernel.org