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BUG: KCSAN: data-race in start_this_handle / start_this_handle

write to 0xffff888103acd070 of 8 bytes by task 10038 on cpu 1:
 jbd2_get_transaction fs/jbd2/transaction.c:125 [inline]
 start_this_handle+0xceb/0x1010 fs/jbd2/transaction.c:400
 jbd2__journal_start+0x1fc/0x3f0 fs/jbd2/transaction.c:503
 __ext4_journal_start_sb+0x159/0x310 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:320 [inline]
 ext4_dirty_inode+0x58/0xa0 fs/ext4/inode.c:5944
 __mark_inode_dirty+0x72/0x6f0 fs/fs-writeback.c:2274
 generic_update_time fs/inode.c:1765 [inline]
 update_time fs/inode.c:1778 [inline]
 touch_atime+0x1b3/0x2d0 fs/inode.c:1849
 file_accessed include/linux/fs.h:2319 [inline]
 generic_file_buffered_read+0x945/0x9c0 mm/filemap.c:2558
 generic_file_read_iter+0x82/0x3e0 mm/filemap.c:2639
 ext4_file_read_iter+0x2e0/0x420 fs/ext4/file.c:74
 call_read_iter include/linux/fs.h:1971 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1325 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888103acd070 of 8 bytes by task 8347 on cpu 0:
 start_this_handle+0x1c1/0x1010 fs/jbd2/transaction.c:352
 jbd2__journal_start+0x1fc/0x3f0 fs/jbd2/transaction.c:503
 __ext4_journal_start_sb+0x159/0x310 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:320 [inline]
 ext4_rmdir+0x4f2/0x970 fs/ext4/namei.c:3139
 vfs_rmdir+0x13b/0x2a0 fs/namei.c:3899
 do_rmdir+0x186/0x310 fs/namei.c:3962
 __do_sys_rmdir fs/namei.c:3980 [inline]
 __se_sys_rmdir fs/namei.c:3978 [inline]
 __x64_sys_rmdir+0x2c/0x30 fs/namei.c:3978
 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: 8347 Comm: syz-executor.3 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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