syzbot

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BUG: KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode

read-write to 0xffff888100631700 of 8 bytes by task 19157 on cpu 0:
 __writeback_single_inode+0x201/0x870 fs/fs-writeback.c:1686
 writeback_sb_inodes+0x4de/0xaa0 fs/fs-writeback.c:1941
 __writeback_inodes_wb+0x9a/0x1a0 fs/fs-writeback.c:2012
 wb_writeback+0x264/0x6f0 fs/fs-writeback.c:2119
 wb_check_old_data_flush fs/fs-writeback.c:2223 [inline]
 wb_do_writeback fs/fs-writeback.c:2276 [inline]
 wb_workfn+0x615/0x940 fs/fs-writeback.c:2304
 process_one_work kernel/workqueue.c:3267 [inline]
 process_scheduled_works+0x465/0x990 kernel/workqueue.c:3348
 worker_thread+0x526/0x730 kernel/workqueue.c:3429
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff888100631700 of 8 bytes by task 2748 on cpu 1:
 __mark_inode_dirty+0x19f/0x7e0 fs/fs-writeback.c:2499
 mark_buffer_dirty+0x165/0x250 fs/buffer.c:1204
 __jbd2_journal_temp_unlink_buffer+0x25a/0x2a0 fs/jbd2/transaction.c:2079
 __jbd2_journal_unfile_buffer fs/jbd2/transaction.c:2093 [inline]
 __jbd2_journal_refile_buffer+0x1eb/0x230 fs/jbd2/transaction.c:2601
 jbd2_journal_commit_transaction+0x2527/0x33d0 fs/jbd2/commit.c:1041
 kjournald2+0x243/0x430 fs/jbd2/journal.c:201
 kthread+0x1d1/0x210 kernel/kthread.c:388
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

value changed: 0x0000000000020084 -> 0x0000000000000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2748 Comm: jbd2/sda1-8 Not tainted 6.9.0-rc6-syzkaller-00290-gb9158815de52 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
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