================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / __writeback_single_inode read-write to 0xffff88810617a1b0 of 8 bytes by task 15559 on cpu 1: __writeback_single_inode+0x201/0x860 fs/fs-writeback.c:1661 writeback_sb_inodes+0x514/0xad0 fs/fs-writeback.c:1916 wb_writeback+0x252/0x6e0 fs/fs-writeback.c:2092 wb_do_writeback fs/fs-writeback.c:2239 [inline] wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2279 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2706 worker_thread+0x525/0x730 kernel/workqueue.c:2787 kthread+0x1d7/0x210 kernel/kthread.c:388 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 read to 0xffff88810617a1b0 of 8 bytes by task 539 on cpu 0: __mark_inode_dirty+0x199/0x7d0 fs/fs-writeback.c:2474 mark_buffer_dirty+0x165/0x240 fs/buffer.c:1204 __block_commit_write fs/buffer.c:2175 [inline] block_write_end+0x158/0x2e0 fs/buffer.c:2251 ext4_da_do_write_end fs/ext4/inode.c:2961 [inline] ext4_da_write_end+0x1fc/0x9c0 fs/ext4/inode.c:3033 generic_perform_write+0x267/0x410 mm/filemap.c:3938 ext4_buffered_write_iter+0x1f6/0x370 fs/ext4/file.c:299 ext4_file_write_iter+0x297/0xe10 __kernel_write_iter+0x162/0x390 fs/read_write.c:523 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x25d/0x480 fs/coredump.c:915 elf_core_dump+0x1a85/0x1ba0 fs/binfmt_elf.c:2077 do_coredump+0x102a/0x1890 fs/coredump.c:764 get_signal+0xdb5/0x10a0 kernel/signal.c:2879 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x98/0x130 kernel/entry/common.c:225 irqentry_exit+0x12/0x40 kernel/entry/common.c:328 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 value changed: 0x0000000000020087 -> 0x0000000000020084 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 539 Comm: syz-executor.4 Not tainted 6.7.0-syzkaller-01727-gab27740f7665 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 ==================================================================