================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / redirty_tail_locked read-write to 0xffff88810a23a708 of 8 bytes by task 14680 on cpu 1: redirty_tail_locked+0x56/0x270 fs/fs-writeback.c:1305 requeue_inode fs/fs-writeback.c:1561 [inline] writeback_sb_inodes+0x7b2/0xaa0 fs/fs-writeback.c:1923 wb_writeback+0x23b/0x6c0 fs/fs-writeback.c:2068 wb_do_writeback fs/fs-writeback.c:2211 [inline] wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2251 process_one_work+0x3e6/0x750 kernel/workqueue.c:2408 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2555 kthread+0x1d7/0x210 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 read to 0xffff88810a23a708 of 8 bytes by task 20155 on cpu 0: __mark_inode_dirty+0x199/0x7d0 fs/fs-writeback.c:2446 mark_buffer_dirty+0x165/0x240 fs/buffer.c:1158 __block_commit_write+0x10a/0x1a0 fs/buffer.c:2138 block_write_end fs/buffer.c:2217 [inline] generic_write_end+0x7f/0x360 fs/buffer.c:2231 ext4_da_write_end+0x4df/0x690 fs/ext4/inode.c:3012 generic_perform_write+0x253/0x3d0 mm/filemap.c:3940 ext4_buffered_write_iter+0x234/0x3e0 fs/ext4/file.c:289 ext4_file_write_iter+0xd7/0x10e0 __kernel_write_iter+0x15c/0x380 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x25d/0x490 fs/coredump.c:915 elf_core_dump+0x1a73/0x1b90 fs/binfmt_elf.c:2142 do_coredump+0x1029/0x1870 fs/coredump.c:764 get_signal+0xd65/0xff0 kernel/signal.c:2862 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204 irqentry_exit_to_user_mode+0x9/0x20 kernel/entry/common.c:310 irqentry_exit+0x12/0x40 kernel/entry/common.c:413 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 value changed: 0x0000000000020087 -> 0x0000000000000007 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 20155 Comm: syz-executor.5 Not tainted 6.4.0-rc7-syzkaller-00234-g547cc9be86f4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 ==================================================================