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KCSAN: data-race in generic_fillattr / shmem_symlink

Status: closed as invalid on 2020/06/18 14:24
Subsystems: fs
[Documentation on labels]
First crash: 1600d, last: 1410d
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in generic_fillattr / shmem_symlink (2) mm 246 11d 139d 0/26 moderation: reported on 2023/12/07 10:25

Sample crash report:
==================================================================
BUG: KCSAN: data-race in generic_fillattr / shmem_symlink

read to 0xffff888120d17958 of 16 bytes by task 24105 on cpu 0:
 generic_fillattr+0x16a/0x1e0 fs/stat.c:47
 vfs_getattr_nosec+0x155/0x160 fs/stat.c:86
 vfs_getattr+0x53/0x70 fs/stat.c:120
 vfs_statx+0x104/0x190 fs/stat.c:201
 vfs_stat include/linux/fs.h:3279 [inline]
 __do_sys_newstat+0x50/0xb0 fs/stat.c:351
 __se_sys_newstat fs/stat.c:347 [inline]
 __x64_sys_newstat+0x37/0x50 fs/stat.c:347
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888120d17958 of 16 bytes by task 23444 on cpu 1:
 shmem_symlink+0x18f/0x480 mm/shmem.c:3140
 vfs_symlink fs/namei.c:3937 [inline]
 vfs_symlink+0x216/0x330 fs/namei.c:3923
 do_symlinkat+0x1ac/0x1e0 fs/namei.c:3964
 __do_sys_symlink fs/namei.c:3983 [inline]
 __se_sys_symlink fs/namei.c:3981 [inline]
 __x64_sys_symlink+0x3c/0x50 fs/namei.c:3981
 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: 23444 Comm: systemd-udevd Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (30):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/13 23:25 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 a61674a5 .config console log report ci2-upstream-kcsan-gce
2020/06/12 05:39 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 819b58b0 .config console log report ci2-upstream-kcsan-gce
2020/06/11 16:24 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 1beaee21 .config console log report ci2-upstream-kcsan-gce
2020/04/17 07:56 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 18397578 .config console log report ci2-upstream-kcsan-gce
2020/04/01 00:44 https://github.com/google/ktsan.git kcsan 40959e34d670 a34e2c33 .config console log report ci2-upstream-kcsan-gce
2020/03/24 04:45 https://github.com/google/ktsan.git kcsan 40959e34d670 33e14df3 .config console log report ci2-upstream-kcsan-gce
2020/03/23 22:04 https://github.com/google/ktsan.git kcsan 40959e34d670 84f999d6 .config console log report ci2-upstream-kcsan-gce
2020/03/13 19:59 https://github.com/google/ktsan.git kcsan 941e0d917bbf 749688d2 .config console log report ci2-upstream-kcsan-gce
2020/03/04 10:41 https://github.com/google/ktsan.git kcsan 766d004d1b85 712198ac .config console log report ci2-upstream-kcsan-gce
2020/03/03 10:29 https://github.com/google/ktsan.git kcsan 766d004d1b85 350a7a26 .config console log report ci2-upstream-kcsan-gce
2020/02/27 08:42 https://github.com/google/ktsan.git kcsan 766d004d1b85 40bcfdd5 .config console log report ci2-upstream-kcsan-gce
2020/02/25 14:24 https://github.com/google/ktsan.git kcsan 766d004d1b85 4c886d6a .config console log report ci2-upstream-kcsan-gce
2020/02/22 03:24 https://github.com/google/ktsan.git kcsan 766d004d1b85 2ffa6679 .config console log report ci2-upstream-kcsan-gce
2020/02/17 13:00 https://github.com/google/ktsan.git kcsan b12d66a6c34f 72bfa6f2 .config console log report ci2-upstream-kcsan-gce
2020/02/17 13:00 https://github.com/google/ktsan.git kcsan b12d66a6c34f 72bfa6f2 .config console log report ci2-upstream-kcsan-gce
2020/02/14 02:03 https://github.com/google/ktsan.git kcsan b12d66a6c34f 5d7b90f1 .config console log report ci2-upstream-kcsan-gce
2020/02/09 09:45 https://github.com/google/ktsan.git kcsan f60f0f543333 6ece2ea5 .config console log report ci2-upstream-kcsan-gce
2020/02/06 12:39 https://github.com/google/ktsan.git kcsan 245a43005292 5be3a391 .config console log report ci2-upstream-kcsan-gce
2020/01/31 20:03 https://github.com/google/ktsan.git kcsan 245a43005292 0eb59c27 .config console log report ci2-upstream-kcsan-gce
2020/01/26 16:44 https://github.com/google/ktsan.git kcsan 245a43005292 dd56146d .config console log report ci2-upstream-kcsan-gce
2020/01/18 21:18 https://github.com/google/ktsan.git kcsan 245a43005292 bc8bc756 .config console log report ci2-upstream-kcsan-gce
2020/01/12 22:51 https://github.com/google/ktsan.git kcsan 245a43005292 53faa9fe .config console log report ci2-upstream-kcsan-gce
2020/01/09 16:25 https://github.com/google/ktsan.git kcsan 245a43005292 4de4e9f0 .config console log report ci2-upstream-kcsan-gce
2019/12/30 21:07 https://github.com/google/ktsan.git kcsan 245a43005292 6b36d338 .config console log report ci2-upstream-kcsan-gce
2019/12/23 12:36 https://github.com/google/ktsan.git kcsan 245a43005292 be5c2c81 .config console log report ci2-upstream-kcsan-gce
2019/12/17 01:03 https://github.com/google/ktsan.git kcsan 245a43005292 d13d7958 .config console log report ci2-upstream-kcsan-gce
2019/12/13 19:58 https://github.com/google/ktsan.git kcsan 245a43005292 a5c1ab05 .config console log report ci2-upstream-kcsan-gce
2019/12/13 07:11 https://github.com/google/ktsan.git kcsan 245a43005292 2a752b7c .config console log report ci2-upstream-kcsan-gce
2019/12/07 21:02 https://github.com/google/ktsan.git kcsan ef798c30ba4e 1508f453 .config console log report ci2-upstream-kcsan-gce
2019/12/06 16:40 https://github.com/google/ktsan.git kcsan ef798c30ba4e 85f26751 .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.