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BUG: KCSAN: data-race in jbd2_journal_stop / jbd2_journal_stop

write to 0xffff8881448c6480 of 4 bytes by task 15962 on cpu 0:
 jbd2_journal_stop+0x2e6/0x6d0 fs/jbd2/transaction.c:1852
 __ext4_journal_stop+0x99/0x110 fs/ext4/ext4_jbd2.c:127
 ext4_create+0x1d3/0x310 fs/ext4/namei.c:2626
 lookup_open fs/namei.c:3106 [inline]
 open_last_lookups fs/namei.c:3180 [inline]
 path_openat+0xcb4/0x20a0 fs/namei.c:3368
 do_filp_open+0xbd/0x1d0 fs/namei.c:3398
 do_sys_openat2+0xa3/0x250 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_openat fs/open.c:1204 [inline]
 __se_sys_openat fs/open.c:1199 [inline]
 __x64_sys_openat+0xef/0x110 fs/open.c:1199
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff8881448c6480 of 4 bytes by task 24627 on cpu 1:
 jbd2_journal_stop+0x297/0x6d0 fs/jbd2/transaction.c:1848
 __ext4_journal_stop+0x99/0x110 fs/ext4/ext4_jbd2.c:127
 ext4_rmdir+0x949/0x970 fs/ext4/namei.c:3186
 vfs_rmdir+0x135/0x2a0 fs/namei.c:3715
 do_rmdir+0x16e/0x300 fs/namei.c:3776
 __do_sys_rmdir fs/namei.c:3794 [inline]
 __se_sys_rmdir fs/namei.c:3792 [inline]
 __x64_sys_rmdir+0x2c/0x30 fs/namei.c:3792
 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: 24627 Comm: syz-executor.1 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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