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KCSAN: data-race in file_remove_privs / new_sync_write (2)

Status: closed as invalid on 2020/06/18 14:24
Subsystems: fs
[Documentation on labels]
First crash: 1609d, last: 1405d
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in file_remove_privs / new_sync_write fs 2 1621d 1622d 0/26 closed as invalid on 2019/11/19 14:14

Sample crash report:
==================================================================
BUG: KCSAN: data-race in file_remove_privs / new_sync_write

write to 0xffff8880810273cc of 4 bytes by task 10091 on cpu 1:
 inode_has_no_xattr include/linux/fs.h:3569 [inline]
 file_remove_privs+0x1c9/0x2a0 fs/inode.c:1863
 __generic_file_write_iter+0xc4/0x370 mm/filemap.c:3377
 generic_file_write_iter+0x294/0x38e mm/filemap.c:3463
 call_write_iter include/linux/fs.h:1907 [inline]
 new_sync_write+0x303/0x400 fs/read_write.c:484
 __vfs_write+0x9e/0xb0 fs/read_write.c:497
 vfs_write fs/read_write.c:559 [inline]
 vfs_write+0x189/0x380 fs/read_write.c:543
 ksys_pwrite64+0xe4/0x110 fs/read_write.c:666
 __do_sys_pwrite64 fs/read_write.c:676 [inline]
 __se_sys_pwrite64 fs/read_write.c:673 [inline]
 __x64_sys_pwrite64+0x5b/0x70 fs/read_write.c:673
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8880810273cc of 4 bytes by task 10078 on cpu 0:
 io_is_direct include/linux/fs.h:3399 [inline]
 iocb_flags include/linux/fs.h:3426 [inline]
 init_sync_kiocb include/linux/fs.h:2080 [inline]
 new_sync_write+0xd6/0x400 fs/read_write.c:480
 __vfs_write+0x9e/0xb0 fs/read_write.c:497
 vfs_write fs/read_write.c:559 [inline]
 vfs_write+0x189/0x380 fs/read_write.c:543
 ksys_pwrite64+0xe4/0x110 fs/read_write.c:666
 __do_sys_pwrite64 fs/read_write.c:676 [inline]
 __se_sys_pwrite64 fs/read_write.c:673 [inline]
 __x64_sys_pwrite64+0x5b/0x70 fs/read_write.c:673
 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: 0 PID: 10078 Comm: syz-executor.1 Not tainted 5.7.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (35):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/13 14:13 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 dbce178a .config console log report ci2-upstream-kcsan-gce
2020/05/29 04:53 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 d19ed305 .config console log report ci2-upstream-kcsan-gce
2020/05/27 03:53 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 9072c126 .config console log report ci2-upstream-kcsan-gce
2020/05/17 23:03 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 37bccd4e .config console log report ci2-upstream-kcsan-gce
2020/05/09 00:00 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 e97b06d3 .config console log report ci2-upstream-kcsan-gce
2020/05/07 06:14 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 4618eb2d .config console log report ci2-upstream-kcsan-gce
2020/05/04 15:17 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 58ae5e18 .config console log report ci2-upstream-kcsan-gce
2020/05/03 02:33 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 5457883a .config console log report ci2-upstream-kcsan-gce
2020/04/27 14:37 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 0ce7569e .config console log report ci2-upstream-kcsan-gce
2020/04/19 07:03 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 365fba24 .config console log report ci2-upstream-kcsan-gce
2020/04/10 16:07 https://github.com/google/ktsan.git kcsan 40959e34d670 a8c6a3f8 .config console log report ci2-upstream-kcsan-gce
2020/04/08 15:06 https://github.com/google/ktsan.git kcsan 40959e34d670 db9bcd4b .config console log report ci2-upstream-kcsan-gce
2020/04/02 06:47 https://github.com/google/ktsan.git kcsan 40959e34d670 a34e2c33 .config console log report ci2-upstream-kcsan-gce
2020/03/29 13:20 https://github.com/google/ktsan.git kcsan 40959e34d670 05736b29 .config console log report ci2-upstream-kcsan-gce
2020/03/16 16:16 https://github.com/google/ktsan.git kcsan 941e0d917bbf 749688d2 .config console log report ci2-upstream-kcsan-gce
2020/03/08 21:43 https://github.com/google/ktsan.git kcsan 941e0d917bbf 2e9971bb .config console log report ci2-upstream-kcsan-gce
2020/03/03 16:25 https://github.com/google/ktsan.git kcsan 766d004d1b85 350a7a26 .config console log report ci2-upstream-kcsan-gce
2020/03/01 15:40 https://github.com/google/ktsan.git kcsan 766d004d1b85 c88c7b75 .config console log report ci2-upstream-kcsan-gce
2020/02/17 09:41 https://github.com/google/ktsan.git kcsan b12d66a6c34f 1f448cd6 .config console log report ci2-upstream-kcsan-gce
2020/02/04 02:35 https://github.com/google/ktsan.git kcsan 245a43005292 93e5e335 .config console log report ci2-upstream-kcsan-gce
2020/01/29 06:51 https://github.com/google/ktsan.git kcsan 245a43005292 c8e81ce4 .config console log report ci2-upstream-kcsan-gce
2020/01/28 11:49 https://github.com/google/ktsan.git kcsan 245a43005292 56cd6c9b .config console log report ci2-upstream-kcsan-gce
2020/01/27 03:51 https://github.com/google/ktsan.git kcsan 245a43005292 dd56146d .config console log report ci2-upstream-kcsan-gce
2020/01/25 17:35 https://github.com/google/ktsan.git kcsan 245a43005292 2e95ab33 .config console log report ci2-upstream-kcsan-gce
2020/01/23 11:29 https://github.com/google/ktsan.git kcsan 245a43005292 3334d684 .config console log report ci2-upstream-kcsan-gce
2020/01/22 00:29 https://github.com/google/ktsan.git kcsan 245a43005292 8eda0b95 .config console log report ci2-upstream-kcsan-gce
2020/01/15 10:18 https://github.com/google/ktsan.git kcsan 245a43005292 fa12bd3c .config console log report ci2-upstream-kcsan-gce
2020/01/14 13:29 https://github.com/google/ktsan.git kcsan 245a43005292 32881205 .config console log report ci2-upstream-kcsan-gce
2020/01/11 14:42 https://github.com/google/ktsan.git kcsan 245a43005292 4c04afaa .config console log report ci2-upstream-kcsan-gce
2020/01/01 15:30 https://github.com/google/ktsan.git kcsan 245a43005292 25a0186e .config console log report ci2-upstream-kcsan-gce
2019/12/29 10:11 https://github.com/google/ktsan.git kcsan 245a43005292 af6b8ef8 .config console log report ci2-upstream-kcsan-gce
2019/12/23 22:25 https://github.com/google/ktsan.git kcsan 245a43005292 be5c2c81 .config console log report ci2-upstream-kcsan-gce
2019/12/15 01:22 https://github.com/google/ktsan.git kcsan 245a43005292 eef6e580 .config console log report ci2-upstream-kcsan-gce
2019/11/24 11:17 https://github.com/google/ktsan.git kcsan 5863cc791e4c 598ca6c8 .config console log report ci2-upstream-kcsan-gce
2019/11/22 03:55 https://github.com/google/ktsan.git kcsan 5863cc791e4c 8098ea0f .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.