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KCSAN: data-race in __snd_rawmidi_transmit_ack / snd_rawmidi_write (2)

Status: auto-closed as invalid on 2020/07/22 21:43
Subsystems: sound
[Documentation on labels]
Reported-by: syzbot+bee37980eff0a59a522d@syzkaller.appspotmail.com
First crash: 1472d, last: 1409d
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __snd_rawmidi_transmit_ack / snd_rawmidi_write sound 168 1473d 1599d 15/26 fixed on 2020/04/15 17:19

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __snd_rawmidi_transmit_ack / snd_rawmidi_write

write to 0xffff8880a09ddcf8 of 8 bytes by task 3439 on cpu 0:
 __snd_rawmidi_transmit_ack+0xcc/0x1c0 sound/core/rawmidi.c:1234
 snd_rawmidi_transmit+0x8c/0xc0 sound/core/rawmidi.c:1293
 snd_vmidi_output_work+0xaf/0x1f0 sound/core/seq/seq_virmidi.c:144
 process_one_work+0x424/0x930 kernel/workqueue.c:2268
 worker_thread+0x9a/0x7e0 kernel/workqueue.c:2414
 kthread+0x203/0x230 kernel/kthread.c:268
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffff8880a09ddcf8 of 8 bytes by task 15998 on cpu 1:
 snd_rawmidi_write+0x5c7/0x730 sound/core/rawmidi.c:1424
 __vfs_write+0x58/0xb0 fs/read_write.c:495
 vfs_write fs/read_write.c:559 [inline]
 vfs_write+0x189/0x380 fs/read_write.c:543
 ksys_write+0x16a/0x1a0 fs/read_write.c:612
 __do_sys_write fs/read_write.c:624 [inline]
 __se_sys_write fs/read_write.c:621 [inline]
 __x64_sys_write+0x49/0x60 fs/read_write.c:621
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15998 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (64):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/17 21:42 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 b6c46f43 .config console log report ci2-upstream-kcsan-gce
2020/06/16 09:53 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 baca2611 .config console log report ci2-upstream-kcsan-gce
2020/06/14 13:27 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2a22c77a .config console log report ci2-upstream-kcsan-gce
2020/06/13 05:14 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 f4724dd3 .config console log report ci2-upstream-kcsan-gce
2020/06/12 05:05 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 819b58b0 .config console log report ci2-upstream-kcsan-gce
2020/06/11 03:55 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 3ab7a05a .config console log report ci2-upstream-kcsan-gce
2020/06/10 22:31 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 5caaad3a .config console log report ci2-upstream-kcsan-gce
2020/06/10 03:59 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 860c4de9 .config console log report ci2-upstream-kcsan-gce
2020/06/08 21:39 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 7604bb03 .config console log report ci2-upstream-kcsan-gce
2020/06/07 22:13 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 7751efd0 .config console log report ci2-upstream-kcsan-gce
2020/06/07 08:58 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2c2b926c .config console log report ci2-upstream-kcsan-gce
2020/06/06 14:20 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 e6b89e4e .config console log report ci2-upstream-kcsan-gce
2020/06/05 13:01 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2420d1bc .config console log report ci2-upstream-kcsan-gce
2020/06/05 00:42 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 6720fdef .config console log report ci2-upstream-kcsan-gce
2020/06/02 17:50 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 52fd7b7d .config console log report ci2-upstream-kcsan-gce
2020/05/31 14:43 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 a0331e89 .config console log report ci2-upstream-kcsan-gce
2020/05/30 02:03 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 bed08304 .config console log report ci2-upstream-kcsan-gce
2020/05/28 15:15 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 c7192a2f .config console log report ci2-upstream-kcsan-gce
2020/05/27 14:56 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9072c126 .config console log report ci2-upstream-kcsan-gce
2020/05/25 14:47 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 73964a9b .config console log report ci2-upstream-kcsan-gce
2020/05/25 01:00 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 11284182 .config console log report ci2-upstream-kcsan-gce
2020/05/24 13:02 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 ce7ca010 .config console log report ci2-upstream-kcsan-gce
2020/05/24 00:15 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 96c92ad3 .config console log report ci2-upstream-kcsan-gce
2020/05/22 20:10 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 4afdfa20 .config console log report ci2-upstream-kcsan-gce
2020/05/22 09:22 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 4afdfa20 .config console log report ci2-upstream-kcsan-gce
2020/05/20 13:22 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 1255f02a .config console log report ci2-upstream-kcsan-gce
2020/05/19 12:02 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 6d882fd2 .config console log report ci2-upstream-kcsan-gce
2020/05/18 12:06 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 24d91142 .config console log report ci2-upstream-kcsan-gce
2020/05/16 02:04 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 37bccd4e .config console log report ci2-upstream-kcsan-gce
2020/05/15 14:21 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 d7f9fffa .config console log report ci2-upstream-kcsan-gce
2020/05/14 13:45 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2d572622 .config console log report ci2-upstream-kcsan-gce
2020/05/12 10:12 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 a497a5b4 .config console log report ci2-upstream-kcsan-gce
2020/05/11 23:32 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9eb09c40 .config console log report ci2-upstream-kcsan-gce
2020/05/10 16:02 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 8742a2b9 .config console log report ci2-upstream-kcsan-gce
2020/05/09 16:59 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 88cb3e92 .config console log report ci2-upstream-kcsan-gce
2020/05/09 02:16 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 e97b06d3 .config console log report ci2-upstream-kcsan-gce
2020/05/06 14:17 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 4618eb2d .config console log report ci2-upstream-kcsan-gce
2020/05/06 01:32 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 35b8eb30 .config console log report ci2-upstream-kcsan-gce
2020/05/04 22:45 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9941337c .config console log report ci2-upstream-kcsan-gce
2020/05/03 11:51 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 58ae5e18 .config console log report ci2-upstream-kcsan-gce
2020/05/02 23:53 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 5457883a .config console log report ci2-upstream-kcsan-gce
2020/05/02 12:15 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 58da4c35 .config console log report ci2-upstream-kcsan-gce
2020/05/02 00:40 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 bc734e7a .config console log report ci2-upstream-kcsan-gce
2020/04/30 14:03 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 3698959a .config console log report ci2-upstream-kcsan-gce
2020/04/30 00:37 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2dd552a5 .config console log report ci2-upstream-kcsan-gce
2020/04/29 12:20 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 ba2806db .config console log report ci2-upstream-kcsan-gce
2020/04/28 12:27 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 e3ecea2e .config console log report ci2-upstream-kcsan-gce
2020/04/26 09:38 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 0ce7569e .config console log report ci2-upstream-kcsan-gce
2020/04/26 09:33 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 0ce7569e .config console log report ci2-upstream-kcsan-gce
2020/04/25 20:37 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 b8bb8e5f .config console log report ci2-upstream-kcsan-gce
2020/04/25 09:52 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 a113ba38 .config console log report ci2-upstream-kcsan-gce
2020/04/24 20:52 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 03d97a1b .config console log report ci2-upstream-kcsan-gce
2020/04/22 01:13 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2e44d63e .config console log report ci2-upstream-kcsan-gce
2020/04/21 18:29 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 f20434a8 .config console log report ci2-upstream-kcsan-gce
2020/04/20 23:32 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 98a9f9e6 .config console log report ci2-upstream-kcsan-gce
2020/04/19 21:48 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9f7c6d12 .config console log report ci2-upstream-kcsan-gce
2020/04/19 12:13 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 6dfd45e1 .config console log report ci2-upstream-kcsan-gce
2020/04/18 12:30 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 435c6d53 .config console log report ci2-upstream-kcsan-gce
2020/04/18 12:20 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 435c6d53 .config console log report ci2-upstream-kcsan-gce
2020/04/17 07:16 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 18397578 .config console log report ci2-upstream-kcsan-gce
2020/04/16 06:05 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 c743fcb3 .config console log report ci2-upstream-kcsan-gce
2020/04/15 21:22 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 3f3c5574 .config console log report ci2-upstream-kcsan-gce
2020/04/15 21:18 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 3f3c5574 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.