KCSAN: data-race in other_inode_match / writeback_single_inode (2)

Status: closed as invalid on 2020/06/18 14:24
Subsystems: ext4
[Documentation on labels]
First crash: 2403d, last: 2249d
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in other_inode_match / writeback_single_inode ext4 6 2 2421d 2451d 0/29 closed as invalid on 2020/01/09 14:13

Sample crash report:
==================================================================
BUG: KCSAN: data-race in other_inode_match / writeback_single_inode

write to 0xffff88812b8925c0 of 8 bytes by task 4935 on cpu 1:
 writeback_single_inode+0x1fc/0x2f0 fs/fs-writeback.c:1562
 sync_inode fs/fs-writeback.c:2602 [inline]
 sync_inode_metadata+0x75/0xa0 fs/fs-writeback.c:2622
 ext4_fsync_nojournal fs/ext4/fsync.c:94 [inline]
 ext4_sync_file+0x47a/0x8b0 fs/ext4/fsync.c:172
 vfs_fsync_range+0x7c/0x150 fs/sync.c:197
 generic_write_sync include/linux/fs.h:2872 [inline]
 ext4_buffered_write_iter+0x211/0x280 fs/ext4/file.c:277
 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642
 call_write_iter include/linux/fs.h:1907 [inline]
 do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:694
 do_iter_write fs/read_write.c:999 [inline]
 do_iter_write+0x137/0x3a0 fs/read_write.c:980
 vfs_iter_write+0x56/0x80 fs/read_write.c:1040
 iter_file_splice_write+0x530/0x830 fs/splice.c:760
 do_splice_from fs/splice.c:863 [inline]
 direct_splice_actor+0x97/0xb0 fs/splice.c:1037
 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992
 do_splice_direct+0x152/0x1d0 fs/splice.c:1080
 do_sendfile+0x380/0x800 fs/read_write.c:1521
 __do_sys_sendfile64 fs/read_write.c:1576 [inline]
 __se_sys_sendfile64 fs/read_write.c:1568 [inline]
 __x64_sys_sendfile64+0xb8/0x140 fs/read_write.c:1568
 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812b8925c0 of 8 bytes by task 4931 on cpu 0:
 other_inode_match+0x6a/0x570 fs/ext4/inode.c:4875
 find_inode_nowait+0x12f/0x160 fs/inode.c:1446
 ext4_update_other_inodes_time fs/ext4/inode.c:4923 [inline]
 ext4_do_update_inode fs/ext4/inode.c:5049 [inline]
 ext4_mark_iloc_dirty+0x12ad/0x1580 fs/ext4/inode.c:5603
 ext4_mark_inode_dirty+0xe6/0x420 fs/ext4/inode.c:5796
 ext4_dirty_inode+0xad/0xd0 fs/ext4/inode.c:5827
 __mark_inode_dirty+0x5b7/0x940 fs/fs-writeback.c:2258
 mark_inode_dirty include/linux/fs.h:2189 [inline]
 generic_write_end+0x24c/0x290 fs/buffer.c:2193
 ext4_da_write_end+0x162/0x690 fs/ext4/inode.c:3090
 generic_perform_write+0x1d7/0x320 mm/filemap.c:3313
 ext4_buffered_write_iter+0x14e/0x280 fs/ext4/file.c:270
 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642
 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_write+0xc5/0x1a0 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: 0 PID: 4931 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 (17):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/13 06:28 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 f4724dd3 .config console log report ci2-upstream-kcsan-gce
2020/05/30 19:57 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 6f3e1c7c .config console log report ci2-upstream-kcsan-gce
2020/05/09 23:16 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 88cb3e92 .config console log report ci2-upstream-kcsan-gce
2020/04/25 21:43 https://github.com/google/ktsan.git kcsan 7c3cd68e5d38 b8bb8e5f .config console log report ci2-upstream-kcsan-gce
2020/04/11 20:22 https://github.com/google/ktsan.git kcsan 40959e34d670 a8c6a3f8 .config console log report ci2-upstream-kcsan-gce
2020/03/03 12:15 https://github.com/google/ktsan.git kcsan 766d004d1b85 350a7a26 .config console log report ci2-upstream-kcsan-gce
2020/02/23 18:13 https://github.com/google/ktsan.git kcsan 766d004d1b85 2c36e7a7 .config console log report ci2-upstream-kcsan-gce
2020/02/20 04:27 https://github.com/google/ktsan.git kcsan b12d66a6c34f b690a6e3 .config console log report ci2-upstream-kcsan-gce
2020/02/13 17:47 https://github.com/google/ktsan.git kcsan 55121bc1808a e6247653 .config console log report ci2-upstream-kcsan-gce
2020/02/06 13:01 https://github.com/google/ktsan.git kcsan 245a43005292 5be3a391 .config console log report ci2-upstream-kcsan-gce
2020/02/06 04:10 https://github.com/google/ktsan.git kcsan 245a43005292 662cf49a .config console log report ci2-upstream-kcsan-gce
2020/02/02 00:14 https://github.com/google/ktsan.git kcsan 245a43005292 2274ad39 .config console log report ci2-upstream-kcsan-gce
2020/01/27 17:00 https://github.com/google/ktsan.git kcsan 245a43005292 56cd6c9b .config console log report ci2-upstream-kcsan-gce
2020/01/27 04:26 https://github.com/google/ktsan.git kcsan 245a43005292 dd56146d .config console log report ci2-upstream-kcsan-gce
2020/01/21 00:16 https://github.com/google/ktsan.git kcsan 245a43005292 8eda0b95 .config console log report ci2-upstream-kcsan-gce
2020/01/12 12:47 https://github.com/google/ktsan.git kcsan 245a43005292 31290a45 .config console log report ci2-upstream-kcsan-gce
2020/01/10 18:27 https://github.com/google/ktsan.git kcsan 245a43005292 532ec44e .config console log report ci2-upstream-kcsan-gce
* Struck through repros no longer work on HEAD.