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BUG: KCSAN: data-race in __jbd2_journal_drop_transaction / start_this_handle

write to 0xffff8881038db078 of 8 bytes by task 6470 on cpu 1:
 jbd2_get_transaction fs/jbd2/transaction.c:125 [inline]
 start_this_handle+0xd37/0x1050 fs/jbd2/transaction.c:416
 jbd2__journal_start+0x1fc/0x3f0 fs/jbd2/transaction.c:525
 __ext4_journal_start_sb+0x159/0x310 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x58/0xa0 fs/ext4/inode.c:5916
 __mark_inode_dirty+0x72/0x6c0 fs/fs-writeback.c:2399
 generic_update_time fs/inode.c:1782 [inline]
 inode_update_time+0x1b4/0x1d0 fs/inode.c:1795
 file_update_time+0x1f3/0x230 fs/inode.c:2012
 ext4_page_mkwrite+0x14d/0xf40 fs/ext4/inode.c:6037
 do_page_mkwrite mm/memory.c:2856 [inline]
 do_shared_fault mm/memory.c:4229 [inline]
 do_fault mm/memory.c:4297 [inline]
 handle_pte_fault mm/memory.c:4551 [inline]
 __handle_mm_fault mm/memory.c:4686 [inline]
 handle_mm_fault+0xdb8/0x1590 mm/memory.c:4784
 do_user_addr_fault+0x609/0xbe0 arch/x86/mm/fault.c:1397
 handle_page_fault arch/x86/mm/fault.c:1485 [inline]
 exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1541
 asm_exc_page_fault+0x1e/0x30

read to 0xffff8881038db078 of 8 bytes by task 1403 on cpu 0:
 __jbd2_journal_drop_transaction+0x1f0/0x2f0 fs/jbd2/checkpoint.c:803
 __jbd2_journal_remove_checkpoint+0x2d5/0x3a0 fs/jbd2/checkpoint.c:734
 jbd2_journal_commit_transaction+0x23f1/0x3460 fs/jbd2/commit.c:1019
 kjournald2+0x263/0x480 fs/jbd2/journal.c:213
 kthread+0x2c7/0x2e0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

value changed: 0x0000000000000000 -> 0xffff88813bd70f00

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 1403 Comm: jbd2/sda1-8 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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