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BUG: KCSAN: data-race in ext4_fc_commit / ext4_fc_commit

write to 0xffff88810316a820 of 8 bytes by task 337 on cpu 0:
 ext4_fc_commit+0x1f4/0x1360
 ext4_fsync_journal fs/ext4/fsync.c:115 [inline]
 ext4_sync_file+0x336/0x6e0 fs/ext4/fsync.c:174
 vfs_fsync_range+0x107/0x120 fs/sync.c:182
 generic_write_sync include/linux/fs.h:2955 [inline]
 ext4_buffered_write_iter+0x322/0x380 fs/ext4/file.c:277
 ext4_file_write_iter+0x2e7/0x1200
 call_write_iter include/linux/fs.h:2162 [inline]
 aio_write+0x2dc/0x3c0 fs/aio.c:1577
 io_submit_one+0x8c4/0x1380 fs/aio.c:1879
 __do_sys_io_submit fs/aio.c:1938 [inline]
 __se_sys_io_submit+0x105/0x280 fs/aio.c:1908
 __x64_sys_io_submit+0x3f/0x50 fs/aio.c:1908
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88810316a820 of 8 bytes by task 338 on cpu 1:
 ext4_fc_commit+0x1c2/0x1360 fs/ext4/fast_commit.c:1205
 ext4_fsync_journal fs/ext4/fsync.c:115 [inline]
 ext4_sync_file+0x336/0x6e0 fs/ext4/fsync.c:174
 vfs_fsync_range+0x107/0x120 fs/sync.c:182
 generic_write_sync include/linux/fs.h:2955 [inline]
 ext4_buffered_write_iter+0x322/0x380 fs/ext4/file.c:277
 ext4_file_write_iter+0x2e7/0x1200
 call_write_iter include/linux/fs.h:2162 [inline]
 aio_write+0x2dc/0x3c0 fs/aio.c:1577
 io_submit_one+0x8c4/0x1380 fs/aio.c:1879
 __do_sys_io_submit fs/aio.c:1938 [inline]
 __se_sys_io_submit+0x105/0x280 fs/aio.c:1908
 __x64_sys_io_submit+0x3f/0x50 fs/aio.c:1908
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000192 -> 0x0000000000000189

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 338 Comm: syz-executor.2 Tainted: G        W         5.16.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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