syzbot


KCSAN: data-race in dput / vfs_unlink

Status: auto-closed as invalid on 2021/05/20 03:05
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+3e2e0c82ea5c71b2f865@syzkaller.appspotmail.com
First crash: 1607d, last: 1069d

Sample crash report:
==================================================================
BUG: KCSAN: data-race in dput / vfs_unlink

write to 0xffff888144936240 of 4 bytes by task 15901 on cpu 0:
 dont_mount include/linux/dcache.h:357 [inline]
 vfs_unlink+0x289/0x3e0 fs/namei.c:4033
 do_unlinkat+0x29f/0x4f0 fs/namei.c:4098
 __do_sys_unlink fs/namei.c:4145 [inline]
 __se_sys_unlink fs/namei.c:4143 [inline]
 __x64_sys_unlink+0x2c/0x30 fs/namei.c:4143
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888144936240 of 4 bytes by task 4830 on cpu 1:
 fast_dput fs/dcache.c:747 [inline]
 dput+0x34/0x430 fs/dcache.c:873
 path_put+0x1b/0x30 fs/namei.c:546
 do_readlinkat+0x188/0x200 fs/stat.c:432
 __do_sys_readlink fs/stat.c:450 [inline]
 __se_sys_readlink fs/stat.c:447 [inline]
 __x64_sys_readlink+0x43/0x50 fs/stat.c:447
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4830 Comm: systemd-udevd Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (273):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/04/15 03:04 upstream 7f75285ca572 fcdb12ba .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/04/13 23:11 upstream eebe426d32e1 a184b83e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/04/13 06:08 upstream 89698becf06d 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/04/11 20:03 upstream 7d900724913c 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/04/11 00:38 upstream d4961772226d 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/04/09 12:41 upstream 17e7124aad76 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/04/08 09:23 upstream 454859c552da 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/04/06 23:43 upstream 2d743660786e 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/04/05 13:52 upstream e49d033bddf5 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/04/01 19:36 upstream ffd9fb546d49 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/31 20:15 upstream d19cc4bfbff1 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/30 20:57 upstream 2bb25b3a748a 6a81331a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/28 20:26 upstream 36a14638f7c0 a8529b82 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/27 01:41 upstream 0f4498cef9f5 a8529b82 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/26 12:41 upstream db24726bfefa a8529b82 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/26 00:11 upstream 002322402daf 6a383ecf .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/25 10:07 upstream e138138003eb 6a383ecf .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/24 14:51 upstream 7acac4b3196c 607e3baf .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/24 00:09 upstream 7acac4b3196c e613994b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/23 10:22 upstream 84196390620a 8092f30d .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/22 23:49 upstream 0d02ec6b3136 8092f30d .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/22 17:47 upstream 0d02ec6b3136 bea32f74 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/22 02:54 upstream 5ee96fa9dd78 4c9a64da .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/20 18:42 upstream 1c273e10bc0c e45f5621 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/19 06:33 upstream bf152b0b41dc 380dcc3e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/18 10:40 upstream 6417f03132a6 7216542e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/16 23:45 upstream 1df27313f50a fdb2bb2c .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/16 08:29 upstream 1a4431a5db2b fdb2bb2c .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/14 20:38 upstream 75013c6c52d8 cc1cff8f .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/14 07:37 upstream 88fe49249c99 4a003785 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/13 16:43 upstream f296bfd5cd04 4a003785 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/12 23:21 upstream f296bfd5cd04 429d8a6b .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/11 20:18 upstream 28806e4d9b97 c2ca1f2a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/10 09:37 upstream 05a59d79793d 26967e35 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/09 02:25 upstream 144c79ef3353 09fbf400 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/03/03 17:08 upstream f69d02e37a85 06ed56cd .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/02/22 02:57 upstream 55f62bc87347 a659b3f1 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/02/21 15:58 upstream e767b3530acb 3e5ed8b4 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/02/20 14:33 upstream f40ddce88593 3e5ed8b4 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/02/18 09:58 upstream f40ddce88593 14052202 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/02/17 18:04 upstream f40ddce88593 052f8d9f .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/02/13 10:24 upstream c6d8570e4d64 98682e5e .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/02/11 14:54 upstream 291009f656e8 a52ee10a .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/02/10 18:25 upstream e0756cfc7d7c 9c8b8541 .config console log report info ci2-upstream-kcsan-gce KCSAN: data-race in dput / vfs_unlink
2021/01/14 02:20 upstream 65f0d2414b70 269d24e8 .config console log report info ci2-upstream-kcsan-gce
2020/04/23 07:46 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 2e44d63e .config console log report ci2-upstream-kcsan-gce
2019/10/24 15:55 https://github.com/google/ktsan.git kcsan 05f2236801fe d01bb02a .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.