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: 226d, last: 3h23m

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	264d	283d	0/22	auto-closed as invalid on 2020/08/28 23:47
upstream	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack				6	380d	444d	0/22	auto-closed as invalid on 2020/06/09 05:57

Sample crash report:

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

write to 0xffff888100f7d840 of 8 bytes by interrupt on cpu 1:
 ps2_handle_ack+0x15a/0x350 drivers/input/serio/libps2.c:439
 atkbd_interrupt+0xbf7/0xcd0 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+0x93/0x460 kernel/irq/handle.c:156
 handle_irq_event_percpu kernel/irq/handle.c:196 [inline]
 handle_irq_event+0x94/0x140 kernel/irq/handle.c:213
 handle_edge_irq+0x17e/0x5e0 kernel/irq/chip.c:819
 generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
 handle_irq arch/x86/kernel/irq.c:231 [inline]
 __common_interrupt+0x38/0xb0 arch/x86/kernel/irq.c:250
 common_interrupt+0x7b/0x90 arch/x86/kernel/irq.c:240
 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:623
 check_kcov_mode kernel/kcov.c:165 [inline]
 write_comp_data kernel/kcov.c:218 [inline]
 __sanitizer_cov_trace_const_cmp8+0x31/0x90 kernel/kcov.c:291
 pmd_none_or_trans_huge_or_clear_bad include/linux/pgtable.h:1265 [inline]
 pmd_trans_unstable include/linux/pgtable.h:1307 [inline]
 pmd_devmap_trans_unstable include/linux/pgtable.h:1321 [inline]
 handle_pte_fault mm/memory.c:4288 [inline]
 __handle_mm_fault mm/memory.c:4453 [inline]
 handle_mm_fault+0xc74/0x1840 mm/memory.c:4551
 do_user_addr_fault+0x60c/0xc00 arch/x86/mm/fault.c:1390
 handle_page_fault arch/x86/mm/fault.c:1475 [inline]
 exc_page_fault+0x94/0x2a0 arch/x86/mm/fault.c:1531
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577

read to 0xffff888100f7d840 of 8 bytes by task 9642 on cpu 0:
 ps2_do_sendbyte+0x12e/0x390 drivers/input/serio/libps2.c:45
 __ps2_command+0x293/0xa00 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+0x2b6/0x2f0 drivers/input/keyboard/atkbd.c:649
 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275
 worker_thread+0x616/0xa70 kernel/workqueue.c:2421
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9642 Comm: kworker/0:7 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events atkbd_event_work
==================================================================

Crashes (37):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/04/15 05:11	upstream	7f75285c	fcdb12ba	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/04/11 07:31	upstream	52e44129	6a81331a	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/04/07 20:32	upstream	3a229812	6a81331a	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/03/23 19:33	upstream	7acac4b3	e613994b	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/03/19 00:10	upstream	bf152b0b	380dcc3e	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/03/12 07:17	upstream	28806e4d	429d8a6b	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/03/10 07:41	upstream	05a59d79	26967e35	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/02/04 22:57	upstream	61556703	42b90a7c	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/01/30 00:22	upstream	bec4c296	fc9fd31e	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/01/29 07:04	upstream	e5ff2cb9	7df34f59	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/01/21 14:54	upstream	9791581c	d4f4eca5	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/01/18 17:06	upstream	19c329f6	63631df1	.config	log	report	info	KCSAN: data-race in ps2_do_sendbyte / ps2_handle_ack
ci2-upstream-kcsan-gce	2021/01/03 16:01	upstream	3516bd72	79264ae3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/29 07:38	upstream	dea8dcf2	8259d56c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/27 23:25	upstream	f838f8d2	2242f77f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/27 11:13	upstream	f838f8d2	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/26 15:21	upstream	40f78232	821e0b09	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/21 11:32	upstream	e37b12e4	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/17 14:12	upstream	accefff5	04201c06	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 12:28	upstream	2c85ebc5	b22a7ec3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 12:19	upstream	2c85ebc5	b22a7ec3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/11 01:50	upstream	9fca90cf	f900b48c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/09 01:05	upstream	7d8761ba	40cc414d	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/28 03:46	upstream	c84e1efa	486f93ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/24 05:26	upstream	d5beb314	1ab681a4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/13 17:07	upstream	585e5b17	4a7fa9b4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/03 09:08	upstream	b7cbaf59	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/23 03:09	upstream	96485e44	4e740c00	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 04:25	upstream	f804b315	be6b1582	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/20 14:27	upstream	270315b8	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/17 00:12	upstream	54a4c789	6e262c73	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/30 03:18	upstream	fb0155a0	5abc3f1a	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/23 20:03	upstream	805c6d3c	54289b08	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/20 07:54	upstream	325d0eab	53ce8104	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/17 22:08	upstream	4cbffc46	8247808b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/15 09:16	upstream	fc4f28bb	9e681632	.config	log	report	info
ci2-upstream-kcsan-gce	2020/08/31 09:21	upstream	dcc5c6f0	d5a3ae1f	.config	log	report