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BUG: KCSAN: data-race in __jbd2_journal_temp_unlink_buffer / jbd2_journal_commit_transaction

write to 0xffff88810121a000 of 8 bytes by task 4853 on cpu 1:
 jbd2_journal_commit_transaction+0x238/0x32b0 fs/jbd2/commit.c:443
 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:296

read to 0xffff88810121a000 of 8 bytes by task 17094 on cpu 0:
 is_journal_aborted include/linux/jbd2.h:1647 [inline]
 __jbd2_journal_temp_unlink_buffer+0x1f5/0x290 fs/jbd2/transaction.c:2018
 __jbd2_journal_file_buffer+0x175/0x380 fs/jbd2/transaction.c:2515
 jbd2_journal_dirty_metadata+0x423/0x670 fs/jbd2/transaction.c:1587
 __ext4_handle_dirty_metadata+0xc1/0x5a0 fs/ext4/ext4_jbd2.c:331
 ext4_handle_dirty_dirblock+0x184/0x330 fs/ext4/namei.c:407
 add_dirent_to_buf+0x4a8/0x610 fs/ext4/namei.c:2033
 ext4_add_entry+0x62e/0x21a0 fs/ext4/namei.c:2242
 ext4_add_nondir+0x50/0x1a0 fs/ext4/namei.c:2576
 ext4_symlink+0x538/0x780 fs/ext4/namei.c:3406
 vfs_symlink+0x216/0x2d0 fs/namei.c:3962
 do_symlinkat+0xee/0x280 fs/namei.c:3989
 __do_sys_symlink fs/namei.c:4008 [inline]
 __se_sys_symlink fs/namei.c:4006 [inline]
 __x64_sys_symlink+0x32/0x40 fs/namei.c:4006
 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: 0 PID: 17094 Comm: syz-executor.4 Not tainted 5.11.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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