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BUG: KCSAN: data-race in jbd2_journal_commit_transaction / jbd2_journal_dirty_metadata

write to 0xffff888144892000 of 8 bytes by task 4810 on cpu 0:
 jbd2_journal_commit_transaction+0x2962/0x3290 fs/jbd2/commit.c:1181
 kjournald2+0x263/0x480 fs/jbd2/journal.c:213
 kthread+0x20b/0x230 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

read to 0xffff888144892000 of 8 bytes by task 10273 on cpu 1:
 is_journal_aborted include/linux/jbd2.h:1647 [inline]
 is_handle_aborted include/linux/jbd2.h:1654 [inline]
 jbd2_journal_dirty_metadata+0x5e/0x670 fs/jbd2/transaction.c:1458
 __ext4_handle_dirty_metadata+0xc6/0x590 fs/ext4/ext4_jbd2.c:331
 ext4_do_update_inode fs/ext4/inode.c:5141 [inline]
 ext4_mark_iloc_dirty+0x12f2/0x16f0 fs/ext4/inode.c:5724
 __ext4_mark_inode_dirty+0x4db/0x5e0 fs/ext4/inode.c:5918
 add_dirent_to_buf+0x498/0x610 fs/ext4/namei.c:2041
 ext4_add_entry+0x62e/0x21a0 fs/ext4/namei.c:2252
 ext4_add_nondir+0x50/0x1a0 fs/ext4/namei.c:2585
 ext4_symlink+0x533/0x780 fs/ext4/namei.c:3417
 vfs_symlink+0xbe/0x170 fs/namei.c:4176
 do_symlinkat+0x11e/0x2b0 fs/namei.c:4206
 __do_sys_symlink fs/namei.c:4227 [inline]
 __se_sys_symlink fs/namei.c:4225 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4225
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 10273 Comm: syz-executor.2 Not tainted 5.12.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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