KCSAN: data-race in snd_rawmidi_kernel_write1 / snd_rawmidi

KCSAN: data-race in snd_rawmidi_kernel_write1 / snd_rawmidi_poll (2)
Status: auto-closed as invalid on 2021/01/18 18:49
Reported-by: syzbot+3fdbb427d995ee4c9600@syzkaller.appspotmail.com
First crash: 388d, last: 231d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in snd_rawmidi_kernel_write1 / snd_rawmidi_poll				1	581d	581d	0/22	auto-closed as invalid on 2020/03/09 13:34

Sample crash report:

==================================================================
BUG: KCSAN: data-race in snd_rawmidi_kernel_write1 / snd_rawmidi_poll

write to 0xffff88813af043f8 of 8 bytes by task 14973 on cpu 0:
 snd_rawmidi_kernel_write1+0x207/0x440 sound/core/rawmidi.c:1378
 snd_rawmidi_write+0x31b/0x6b0 sound/core/rawmidi.c:1452
 vfs_write+0x21a/0x7c0 fs/read_write.c:603
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88813af043f8 of 8 bytes by task 14984 on cpu 1:
 snd_rawmidi_ready sound/core/rawmidi.c:102 [inline]
 snd_rawmidi_poll+0x1ce/0x210 sound/core/rawmidi.c:1506
 vfs_poll include/linux/poll.h:90 [inline]
 do_select+0x8e4/0xf30 fs/select.c:534
 core_sys_select+0x41f/0x670 fs/select.c:677
 do_pselect fs/select.c:759 [inline]
 __do_sys_pselect6+0x1bf/0x220 fs/select.c:800
 __se_sys_pselect6 fs/select.c:791 [inline]
 __x64_sys_pselect6+0x74/0x80 fs/select.c:791
 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: 14984 Comm: syz-executor.2 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (173):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info
ci2-upstream-kcsan-gce	2020/12/14 18:48	upstream	2c85ebc57b3e	97183ed7	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 07:09	upstream	2c85ebc57b3e	b22a7ec3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/13 10:39	upstream	6bff9bb8a292	bca53db9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/07 21:59	upstream	cd796ed33450	51a9082e	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 22:28	upstream	32f741b02f1a	50503117	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/05 07:43	upstream	b3298500b23f	0ef84591	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/03 00:32	upstream	3bb61aa61828	8c9190ef	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/02 01:48	upstream	509a15421674	c42a35e9	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/01 00:00	upstream	b65054597872	b3a34598	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/26 05:01	upstream	fa02fcd94b0c	2f1cec62	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/24 20:58	upstream	80145ac2f739	e34b696c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/22 00:16	upstream	a349e4c65960	0d27f508	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/21 11:29	upstream	27bba9c532a8	c7ec2d19	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/21 06:48	upstream	27bba9c532a8	68068804	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/20 11:36	upstream	4d02da974ea8	0767f13f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/19 20:57	upstream	131ad0b6f529	0767f13f	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/17 23:24	upstream	111e91a6df50	09323409	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/17 10:22	upstream	9c87c9f41245	bd2a760b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/15 03:15	upstream	e28c0d7c92c8	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/14 14:46	upstream	f01c30de86f1	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/14 00:08	upstream	9e6a39eae450	1bf9a662	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/13 12:33	upstream	585e5b17b92d	4a7fa9b4	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/12 23:03	upstream	af5043c89a8e	16fca0c8	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/08 19:41	upstream	9dbc1c03eeb5	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/11/07 12:02	upstream	659caaf65dc9	cba33199	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/31 00:36	upstream	f5d808567a51	18e33098	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/30 11:08	upstream	07e088730245	a6e3ac3b	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/29 07:22	upstream	23859ae44402	f24824d3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/28 17:26	upstream	ed8780e3f2ec	f24824d3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/27 23:25	upstream	ed8780e3f2ec	96e03c1c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/27 12:37	upstream	4525c8781ec0	94942294	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/25 20:41	upstream	986b9eacb259	a1839e81	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/23 20:09	upstream	0adc313c4f20	2bb6666c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/22 18:50	upstream	96485e446260	be6b1582	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/21 11:17	upstream	c4d6fe731176	99c64d5c	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/21 02:34	upstream	c4d6fe731176	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/20 12:36	upstream	270315b8235e	ff4a3345	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/17 12:58	upstream	071a0578b0ce	fea47c01	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/17 00:09	upstream	54a4c789ca80	6e262c73	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/16 09:41	upstream	9ff9b0d392ea	6e262c73	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/15 20:30	upstream	726eb70e0d34	6e262c73	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/15 08:28	upstream	3e4fb4346c78	63869021	.config	log	report	info
ci2-upstream-kcsan-gce	2020/10/12 20:07	upstream	1e6d1d96461e	d32b0bbf	.config	log	report	info
ci2-upstream-kcsan-gce	2020/09/09 06:08	upstream	34d4ddd359db	0ea7a887	.config	log	report
ci2-upstream-kcsan-gce	2020/09/08 19:12	upstream	6f6a73c8b715	abf9ba4f	.config	log	report
ci2-upstream-kcsan-gce	2020/07/10 17:37	upstream	42f82040ee66	56d01184	.config	log	report