syzbot


KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (7)

Status: auto-obsoleted due to no activity on 2023/06/13 15:21
Subsystems: ext4
[Documentation on labels]
First crash: 683d, last: 683d
Similar bugs (8)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (6) exfat 1 1386d 1386d 0/28 auto-closed as invalid on 2021/07/10 17:50
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (9) ext4 2 174d 178d 0/28 auto-obsoleted due to no activity on 2024/11/03 13:13
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (5) ext4 5 1443d 1490d 0/28 auto-closed as invalid on 2021/05/14 12:10
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (4) ext4 6 1544d 1566d 0/28 auto-closed as invalid on 2021/02/02 16:23
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (8) exfat 1 488d 467d 0/28 auto-obsoleted due to no activity on 2023/12/26 00:02
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (2) ext4 1 1738d 1738d 0/28 closed as invalid on 2020/06/18 14:13
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range (3) ext4 1 1705d 1705d 0/28 auto-closed as invalid on 2020/08/25 18:47
upstream KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range ext4 2 1975d 1977d 0/28 closed as invalid on 2019/11/19 13:44

Sample crash report:
==================================================================
BUG: KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range

write to 0xffff888109dd4848 of 8 bytes by task 3829 on cpu 0:
 __mark_inode_dirty+0x117/0x7d0 fs/fs-writeback.c:2409
 mark_inode_dirty_sync include/linux/fs.h:2149 [inline]
 vfs_fsync_range+0xda/0x120 fs/sync.c:187
 generic_write_sync include/linux/fs.h:2469 [inline]
 ext4_buffered_write_iter+0x397/0x3e0 fs/ext4/file.c:296
 ext4_file_write_iter+0xd7/0x10e0
 do_iter_write+0x4ae/0x770 fs/read_write.c:860
 vfs_iter_write+0x50/0x70 fs/read_write.c:901
 iter_file_splice_write+0x456/0x7d0 fs/splice.c:795
 do_splice_from fs/splice.c:873 [inline]
 direct_splice_actor+0x84/0xa0 fs/splice.c:1039
 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:994
 do_splice_direct+0x104/0x180 fs/splice.c:1082
 do_sendfile+0x3b8/0x950 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888109dd4848 of 8 bytes by task 3812 on cpu 1:
 vfs_fsync_range+0x9c/0x120 fs/sync.c:186
 generic_write_sync include/linux/fs.h:2469 [inline]
 ext4_buffered_write_iter+0x397/0x3e0 fs/ext4/file.c:296
 ext4_file_write_iter+0xd7/0x10e0
 do_iter_write+0x4ae/0x770 fs/read_write.c:860
 vfs_iter_write+0x50/0x70 fs/read_write.c:901
 iter_file_splice_write+0x456/0x7d0 fs/splice.c:795
 do_splice_from fs/splice.c:873 [inline]
 direct_splice_actor+0x84/0xa0 fs/splice.c:1039
 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:994
 do_splice_direct+0x104/0x180 fs/splice.c:1082
 do_sendfile+0x3b8/0x950 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x110/0x150 fs/read_write.c:1308
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000000804 -> 0x0000000000000005

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3812 Comm: syz-executor.3 Not tainted 6.4.0-rc1-syzkaller-00001-gba0ad6ed89fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/05/09 15:17 upstream ba0ad6ed89fd 30aa2a7e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in __mark_inode_dirty / vfs_fsync_range
* Struck through repros no longer work on HEAD.