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BUG: KCSAN: data-race in jbd2_journal_stop / jbd2_journal_stop

write to 0xffff88814457fc80 of 4 bytes by task 24432 on cpu 1:
 jbd2_journal_stop+0x2e6/0x6d0 fs/jbd2/transaction.c:1852
 __ext4_journal_stop+0x99/0x110 fs/ext4/ext4_jbd2.c:127
 ext4_mkdir+0x2e0/0x760 fs/ext4/namei.c:2845
 vfs_mkdir+0x135/0x1f0 fs/namei.c:3817
 do_mkdirat+0x147/0x230 fs/namei.c:3842
 __do_sys_mkdir fs/namei.c:3860 [inline]
 __se_sys_mkdir fs/namei.c:3858 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3858
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88814457fc80 of 4 bytes by task 8411 on cpu 0:
 jbd2_journal_stop+0x297/0x6d0 fs/jbd2/transaction.c:1848
 __ext4_journal_stop+0x99/0x110 fs/ext4/ext4_jbd2.c:127
 ext4_mkdir+0x2e0/0x760 fs/ext4/namei.c:2845
 vfs_mkdir+0x135/0x1f0 fs/namei.c:3817
 do_mkdirat+0x147/0x230 fs/namei.c:3842
 __do_sys_mkdir fs/namei.c:3860 [inline]
 __se_sys_mkdir fs/namei.c:3858 [inline]
 __x64_sys_mkdir+0x32/0x40 fs/namei.c:3858
 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: 0 PID: 8411 Comm: syz-executor.4 Not tainted 5.12.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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