KCSAN: data-race in snd_rawmidi_kernel_write1 / snd_rawmidi_poll (2)

Status: auto-closed as invalid on 2021/01/18 18:49
Subsystems: sound
[Documentation on labels]
Reported-by: syzbot+3fdbb427d995ee4c9600@syzkaller.appspotmail.com
First crash: 2223d, last: 2066d
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in snd_rawmidi_kernel_write1 / snd_rawmidi_poll sound 6 1 2416d 2416d 0/29 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):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/12/14 18:48 upstream 2c85ebc57b3e 97183ed7 .config console log report info ci2-upstream-kcsan-gce
2020/12/14 07:09 upstream 2c85ebc57b3e b22a7ec3 .config console log report info ci2-upstream-kcsan-gce
2020/12/13 10:39 upstream 6bff9bb8a292 bca53db9 .config console log report info ci2-upstream-kcsan-gce
2020/12/07 21:59 upstream cd796ed33450 51a9082e .config console log report info ci2-upstream-kcsan-gce
2020/12/05 22:28 upstream 32f741b02f1a 50503117 .config console log report info ci2-upstream-kcsan-gce
2020/12/05 07:43 upstream b3298500b23f 0ef84591 .config console log report info ci2-upstream-kcsan-gce
2020/12/03 00:32 upstream 3bb61aa61828 8c9190ef .config console log report info ci2-upstream-kcsan-gce
2020/12/02 01:48 upstream 509a15421674 c42a35e9 .config console log report info ci2-upstream-kcsan-gce
2020/12/01 00:00 upstream b65054597872 b3a34598 .config console log report info ci2-upstream-kcsan-gce
2020/11/26 05:01 upstream fa02fcd94b0c 2f1cec62 .config console log report info ci2-upstream-kcsan-gce
2020/11/24 20:58 upstream 80145ac2f739 e34b696c .config console log report info ci2-upstream-kcsan-gce
2020/11/22 00:16 upstream a349e4c65960 0d27f508 .config console log report info ci2-upstream-kcsan-gce
2020/11/21 11:29 upstream 27bba9c532a8 c7ec2d19 .config console log report info ci2-upstream-kcsan-gce
2020/11/21 06:48 upstream 27bba9c532a8 68068804 .config console log report info ci2-upstream-kcsan-gce
2020/11/20 11:36 upstream 4d02da974ea8 0767f13f .config console log report info ci2-upstream-kcsan-gce
2020/11/19 20:57 upstream 131ad0b6f529 0767f13f .config console log report info ci2-upstream-kcsan-gce
2020/11/17 23:24 upstream 111e91a6df50 09323409 .config console log report info ci2-upstream-kcsan-gce
2020/11/17 10:22 upstream 9c87c9f41245 bd2a760b .config console log report info ci2-upstream-kcsan-gce
2020/11/15 03:15 upstream e28c0d7c92c8 1bf9a662 .config console log report info ci2-upstream-kcsan-gce
2020/11/14 14:46 upstream f01c30de86f1 1bf9a662 .config console log report info ci2-upstream-kcsan-gce
2020/11/14 00:08 upstream 9e6a39eae450 1bf9a662 .config console log report info ci2-upstream-kcsan-gce
2020/11/13 12:33 upstream 585e5b17b92d 4a7fa9b4 .config console log report info ci2-upstream-kcsan-gce
2020/11/12 23:03 upstream af5043c89a8e 16fca0c8 .config console log report info ci2-upstream-kcsan-gce
2020/11/08 19:41 upstream 9dbc1c03eeb5 cba33199 .config console log report info ci2-upstream-kcsan-gce
2020/11/07 12:02 upstream 659caaf65dc9 cba33199 .config console log report info ci2-upstream-kcsan-gce
2020/10/31 00:36 upstream f5d808567a51 18e33098 .config console log report info ci2-upstream-kcsan-gce
2020/10/30 11:08 upstream 07e088730245 a6e3ac3b .config console log report info ci2-upstream-kcsan-gce
2020/10/29 07:22 upstream 23859ae44402 f24824d3 .config console log report info ci2-upstream-kcsan-gce
2020/10/28 17:26 upstream ed8780e3f2ec f24824d3 .config console log report info ci2-upstream-kcsan-gce
2020/10/27 23:25 upstream ed8780e3f2ec 96e03c1c .config console log report info ci2-upstream-kcsan-gce
2020/10/27 12:37 upstream 4525c8781ec0 94942294 .config console log report info ci2-upstream-kcsan-gce
2020/10/25 20:41 upstream 986b9eacb259 a1839e81 .config console log report info ci2-upstream-kcsan-gce
2020/10/23 20:09 upstream 0adc313c4f20 2bb6666c .config console log report info ci2-upstream-kcsan-gce
2020/10/22 18:50 upstream 96485e446260 be6b1582 .config console log report info ci2-upstream-kcsan-gce
2020/10/21 11:17 upstream c4d6fe731176 99c64d5c .config console log report info ci2-upstream-kcsan-gce
2020/10/21 02:34 upstream c4d6fe731176 ff4a3345 .config console log report info ci2-upstream-kcsan-gce
2020/10/20 12:36 upstream 270315b8235e ff4a3345 .config console log report info ci2-upstream-kcsan-gce
2020/10/17 12:58 upstream 071a0578b0ce fea47c01 .config console log report info ci2-upstream-kcsan-gce
2020/10/17 00:09 upstream 54a4c789ca80 6e262c73 .config console log report info ci2-upstream-kcsan-gce
2020/10/16 09:41 upstream 9ff9b0d392ea 6e262c73 .config console log report info ci2-upstream-kcsan-gce
2020/10/15 20:30 upstream 726eb70e0d34 6e262c73 .config console log report info ci2-upstream-kcsan-gce
2020/10/15 08:28 upstream 3e4fb4346c78 63869021 .config console log report info ci2-upstream-kcsan-gce
2020/10/12 20:07 upstream 1e6d1d96461e d32b0bbf .config console log report info ci2-upstream-kcsan-gce
2020/09/09 06:08 upstream 34d4ddd359db 0ea7a887 .config console log report ci2-upstream-kcsan-gce
2020/09/08 19:12 upstream 6f6a73c8b715 abf9ba4f .config console log report ci2-upstream-kcsan-gce
2020/07/10 17:37 upstream 42f82040ee66 56d01184 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.