================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes write to 0xffff88802e462838 of 8 bytes by task 3167 on cpu 1: writeback_sb_inodes+0x494/0x1020 fs/fs-writeback.c:1710 wb_writeback+0x27d/0x660 fs/fs-writeback.c:1894 wb_do_writeback+0x101/0x5d0 fs/fs-writeback.c:2039 wb_workfn+0xb8/0x410 fs/fs-writeback.c:2080 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x635/0xb90 kernel/workqueue.c:2421 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffff88802e462838 of 8 bytes by task 32453 on cpu 0: __mark_inode_dirty+0xb4/0x6b0 fs/fs-writeback.c:2274 mark_inode_dirty include/linux/fs.h:2181 [inline] dquot_alloc_space include/linux/quotaops.h:317 [inline] dquot_alloc_block include/linux/quotaops.h:334 [inline] ext4_mb_new_blocks+0xc7b/0x1140 fs/ext4/mballoc.c:4937 ext4_ext_map_blocks+0x15a0/0x1fc0 fs/ext4/extents.c:4238 ext4_map_blocks+0x700/0xfc0 fs/ext4/inode.c:637 ext4_alloc_file_blocks+0x26f/0x700 fs/ext4/extents.c:4426 ext4_fallocate+0x2a7/0x540 fs/ext4/extents.c:4705 vfs_fallocate+0x471/0x6c0 fs/open.c:309 file_ioctl fs/ioctl.c:494 [inline] do_vfs_ioctl+0xdc9/0xec0 fs/ioctl.c:732 __do_sys_ioctl fs/ioctl.c:751 [inline] __se_sys_ioctl+0x83/0x140 fs/ioctl.c:739 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 32453 Comm: syz-executor.3 Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================