KCSAN: data-race in ps2_do_sendbyte / ps2_handle

KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack (3)
Status: moderation: reported on 2020/12/07 11:53
Reported-by: syzbot+85537422410fcb98abbd@syzkaller.appspotmail.com
First crash: 146d, last: 3d17h

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack (2)				4	184d	203d	0/17	auto-closed as invalid on 2020/08/28 23:47
upstream	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack				6	300d	364d	0/17	auto-closed as invalid on 2020/06/09 05:57

Sample crash report:

==================================================================
BUG: KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack

read-write to 0xffff8881038ed040 of 8 bytes by interrupt on cpu 0:
 ps2_handle_ack+0x147/0x340 drivers/input/serio/libps2.c:439
 atkbd_interrupt+0xbe2/0xcc0 drivers/input/keyboard/atkbd.c:434
 serio_interrupt+0x5d/0xe0 drivers/input/serio/serio.c:1002
 i8042_interrupt+0x39e/0x720 drivers/input/serio/i8042.c:602
 __handle_irq_event_percpu+0x93/0x450 kernel/irq/handle.c:156
 handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
 handle_irq_event+0x81/0x120 kernel/irq/handle.c:213
 handle_edge_irq+0x16e/0x590 kernel/irq/chip.c:819
 asm_call_irq_on_stack+0xf/0x20
 __run_irq_on_irqstack arch/x86/include/asm/irq_stack.h:48 [inline]
 run_irq_on_irqstack_cond arch/x86/include/asm/irq_stack.h:101 [inline]
 handle_irq arch/x86/kernel/irq.c:230 [inline]
 __common_interrupt arch/x86/kernel/irq.c:249 [inline]
 common_interrupt+0x8e/0x130 arch/x86/kernel/irq.c:239
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:619
 sb_find_get_block include/linux/buffer_head.h:338 [inline]
 recently_deleted fs/ext4/ialloc.c:686 [inline]
 find_inode_bit+0x1a0/0x3a0 fs/ext4/ialloc.c:728
 __ext4_new_inode+0xd22/0x3060 fs/ext4/ialloc.c:1062
 ext4_symlink+0x2bc/0x780 fs/ext4/namei.c:3336
 vfs_symlink+0x216/0x2d0 fs/namei.c:3962
 do_symlinkat+0xee/0x280 fs/namei.c:3989
 __do_sys_symlink fs/namei.c:4008 [inline]
 __se_sys_symlink fs/namei.c:4006 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4006
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881038ed040 of 8 bytes by task 8833 on cpu 1:
 ps2_do_sendbyte+0x1a1/0x370 drivers/input/serio/libps2.c:45
 __ps2_command+0x298/0x990 drivers/input/serio/libps2.c:265
 ps2_command+0x51/0x90 drivers/input/serio/libps2.c:332
 atkbd_set_repeat_rate drivers/input/keyboard/atkbd.c:595 [inline]
 atkbd_event_work+0x2c5/0x300 drivers/input/keyboard/atkbd.c:649
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x635/0xb90 kernel/workqueue.c:2421
 kthread+0x1fd/0x220 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8833 Comm: kworker/1:3 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events atkbd_event_work
==================================================================

Crashes (27):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Maintainers
ci2-upstream-kcsan-gce	2021/01/21 14:54	upstream	9791581c	d4f4eca5	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2021/01/18 17:06	upstream	19c329f6	63631df1	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2021/01/03 16:01	upstream	3516bd72	79264ae3	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/29 07:38	upstream	dea8dcf2	8259d56c	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/27 23:25	upstream	f838f8d2	2242f77f	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/27 11:13	upstream	f838f8d2	821e0b09	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/26 15:21	upstream	40f78232	821e0b09	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/21 11:32	upstream	e37b12e4	04201c06	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/17 14:12	upstream	accefff5	04201c06	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/14 12:28	upstream	2c85ebc5	b22a7ec3	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/14 12:19	upstream	2c85ebc5	b22a7ec3	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/11 01:50	upstream	9fca90cf	f900b48c	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/12/09 01:05	upstream	7d8761ba	40cc414d	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/28 03:46	upstream	c84e1efa	486f93ef	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/24 05:26	upstream	d5beb314	1ab681a4	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/13 17:07	upstream	585e5b17	4a7fa9b4	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/11/03 09:08	upstream	b7cbaf59	cba33199	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/23 03:09	upstream	96485e44	4e740c00	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/22 04:25	upstream	f804b315	be6b1582	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/20 14:27	upstream	270315b8	ff4a3345	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/10/17 00:12	upstream	54a4c789	6e262c73	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/30 03:18	upstream	fb0155a0	5abc3f1a	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/23 20:03	upstream	805c6d3c	54289b08	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/20 07:54	upstream	325d0eab	53ce8104	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/17 22:08	upstream	4cbffc46	8247808b	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/09/15 09:16	upstream	fc4f28bb	9e681632	.config	log	report	info	dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
ci2-upstream-kcsan-gce	2020/08/31 09:21	upstream	dcc5c6f0	d5a3ae1f	.config	log	report		dmitry.torokhov@gmail.com, gustavoars@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org