KCSAN: data-race in __mark_inode_dirty / ext4_sync

KCSAN: data-race in __mark_inode_dirty / ext4_sync_file (4)
Status: auto-closed as invalid on 2021/03/14 09:37
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 313d, last: 253d

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in __mark_inode_dirty / ext4_sync_file (3)	4	356d	396d	0/22	auto-closed as invalid on 2020/12/01 12:40
upstream	KCSAN: data-race in __mark_inode_dirty / ext4_sync_file (5)	1	213d	213d	0/22	auto-closed as invalid on 2021/04/23 13:27
upstream	KCSAN: data-race in __mark_inode_dirty / ext4_sync_file	1	513d	513d	0/22	closed as invalid on 2020/06/18 14:13
upstream	KCSAN: data-race in __mark_inode_dirty / ext4_sync_file (2)	1	452d	452d	0/22	auto-closed as invalid on 2020/08/27 02:47

Sample crash report:

EXT4-fs (loop1): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback.
==================================================================
BUG: KCSAN: data-race in __mark_inode_dirty / ext4_sync_file

write to 0xffff888107476c58 of 8 bytes by task 621 on cpu 0:
 __mark_inode_dirty+0x21f/0x6b0 fs/fs-writeback.c:2293
 mark_buffer_dirty+0x143/0x230 fs/buffer.c:1141
 __block_commit_write fs/buffer.c:2084 [inline]
 block_write_end+0x13d/0x230 fs/buffer.c:2162
 ext4_write_end+0x19e/0xa00 fs/ext4/inode.c:1300
 ext4_da_write_end+0x93/0x760 fs/ext4/inode.c:3080
 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3423
 ext4_buffered_write_iter+0x2e5/0x3e0 fs/ext4/file.c:270
 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x41a/0x770 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:933
 splice_direct_to_actor+0x345/0x650 fs/splice.c:888
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1318 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888107476c58 of 8 bytes by task 607 on cpu 1:
 ext4_fsync_nojournal fs/ext4/fsync.c:87 [inline]
 ext4_sync_file+0x294/0x6e0 fs/ext4/fsync.c:170
 vfs_fsync_range+0x107/0x120 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2737 [inline]
 ext4_buffered_write_iter+0x38f/0x3e0 fs/ext4/file.c:278
 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503
 call_write_iter include/linux/fs.h:1901 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x41a/0x770 fs/splice.c:686
 do_splice_from fs/splice.c:764 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:933
 splice_direct_to_actor+0x345/0x650 fs/splice.c:888
 do_splice_direct+0xf5/0x170 fs/splice.c:976
 do_sendfile+0x5e0/0xcf0 fs/read_write.c:1257
 __do_sys_sendfile64 fs/read_write.c:1318 [inline]
 __se_sys_sendfile64 fs/read_write.c:1304 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 607 Comm: syz-executor.1 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (5):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci2-upstream-kcsan-gce	2021/02/07 09:28	upstream	825b5991a46e	2ce644fc	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / ext4_sync_file
ci2-upstream-kcsan-gce	2021/02/06 15:22	upstream	1e0d27fce010	0655e081	.config	log	report	info	KCSAN: data-race in __mark_inode_dirty / ext4_sync_file
ci2-upstream-kcsan-gce	2021/01/13 11:43	upstream	e609571b5ffa	a945f0a3	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/14 18:47	upstream	2c85ebc57b3e	97183ed7	.config	log	report	info
ci2-upstream-kcsan-gce	2020/12/09 00:29	upstream	7d8761ba27fc	40cc414d	.config	log	report	info