================================================================== BUG: KCSAN: data-race in ext4_write_end / ext4_writepages write to 0xffff8881344b8c48 of 8 bytes by task 2093 on cpu 1: i_size_write include/linux/fs.h:907 [inline] ext4_update_inode_size fs/ext4/ext4.h:3427 [inline] ext4_write_end+0x16d/0x710 fs/ext4/inode.c:1305 ext4_da_write_end+0x6d/0x630 fs/ext4/inode.c:3009 generic_perform_write+0x261/0x400 mm/filemap.c:3776 ext4_buffered_write_iter+0x244/0x360 fs/ext4/file.c:268 ext4_file_write_iter+0x2e7/0x11f0 call_write_iter include/linux/fs.h:2074 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x7f5/0x950 fs/read_write.c:590 ksys_write+0xd9/0x190 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881344b8c48 of 8 bytes by task 1850 on cpu 0: i_size_read include/linux/fs.h:885 [inline] mpage_submit_page fs/ext4/inode.c:2074 [inline] mpage_map_and_submit_buffers fs/ext4/inode.c:2326 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2465 [inline] ext4_writepages+0x10b6/0x1e80 fs/ext4/inode.c:2778 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364 __writeback_single_inode+0x81/0x590 fs/fs-writeback.c:1618 writeback_sb_inodes+0x677/0xdf0 fs/fs-writeback.c:1891 wb_writeback+0x26b/0x650 fs/fs-writeback.c:2064 wb_do_writeback+0x101/0x560 fs/fs-writeback.c:2207 wb_workfn+0xc8/0x440 fs/fs-writeback.c:2248 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307 worker_thread+0x616/0xa70 kernel/workqueue.c:2454 kthread+0x1bf/0x1e0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 value changed: 0x0000000000f7d000 -> 0x0000000000f7e000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1850 Comm: kworker/u4:6 Not tainted 5.17.0-rc2-syzkaller-00060-g88808fbbead4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) ================================================================== vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device