================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes write to 0xffff8881065c41c0 of 8 bytes by task 1597 on cpu 0: writeback_sb_inodes+0x2da/0xad0 fs/fs-writeback.c:1888 wb_writeback+0x252/0x6e0 fs/fs-writeback.c:2075 wb_do_writeback fs/fs-writeback.c:2222 [inline] wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2262 process_one_work kernel/workqueue.c:2630 [inline] process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703 worker_thread+0x525/0x730 kernel/workqueue.c:2784 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:304 read to 0xffff8881065c41c0 of 8 bytes by task 11169 on cpu 1: __mark_inode_dirty+0x58/0x7d0 fs/fs-writeback.c:2417 mark_inode_dirty_sync include/linux/fs.h:2242 [inline] dquot_free_space include/linux/quotaops.h:385 [inline] dquot_free_block include/linux/quotaops.h:395 [inline] ext4_mb_new_blocks+0x16a2/0x21e0 fs/ext4/mballoc.c:6273 ext4_ext_map_blocks+0x1086/0x3640 fs/ext4/extents.c:4285 ext4_map_blocks+0x704/0xf60 fs/ext4/inode.c:621 ext4_alloc_file_blocks+0x285/0x6f0 fs/ext4/extents.c:4462 ext4_zero_range+0x73c/0x850 fs/ext4/extents.c:4622 ext4_fallocate+0x3ab/0x1190 fs/ext4/extents.c:4721 vfs_fallocate+0x378/0x3e0 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0x79/0xc0 fs/open.c:353 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x0000000000020007 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 11169 Comm: syz-executor.3 Not tainted 6.6.0-rc7-syzkaller-00041-g611da07b89fd #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 ==================================================================