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BUG: KCSAN: data-race in jbd2_journal_stop / jbd2_journal_stop

write to 0xffff888144444c80 of 4 bytes by task 17274 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_symlink+0x554/0x780 fs/ext4/namei.c:3419
 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

read to 0xffff888144444c80 of 4 bytes by task 17276 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_symlink+0x554/0x780 fs/ext4/namei.c:3419
 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: 0 PID: 17276 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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