================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes write to 0xffff8880b7b2bcc0 of 8 bytes by task 12127 on cpu 1: writeback_sb_inodes+0x3a7/0xe40 fs/fs-writeback.c:1705 wb_writeback+0x2b8/0x730 fs/fs-writeback.c:1892 wb_do_writeback+0x108/0x610 fs/fs-writeback.c:2037 wb_workfn+0xc8/0x460 fs/fs-writeback.c:2078 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 read to 0xffff8880b7b2bcc0 of 8 bytes by task 21002 on cpu 0: __mark_inode_dirty+0xb9/0x7e0 fs/fs-writeback.c:2272 mark_inode_dirty include/linux/fs.h:2192 [inline] dquot_alloc_space include/linux/quotaops.h:320 [inline] dquot_alloc_block include/linux/quotaops.h:337 [inline] ext4_mb_new_blocks+0x7c8/0xcf0 fs/ext4/mballoc.c:4683 ext4_ext_map_blocks+0x164e/0x20c0 fs/ext4/extents.c:4244 ext4_map_blocks+0x6d3/0xf60 fs/ext4/inode.c:626 ext4_alloc_file_blocks+0x25e/0x6e0 fs/ext4/extents.c:4433 ext4_fallocate+0x282/0x560 fs/ext4/extents.c:4702 vfs_fallocate+0x431/0x580 fs/open.c:309 file_ioctl fs/ioctl.c:494 [inline] do_vfs_ioctl+0xde0/0xec0 fs/ioctl.c:732 ksys_ioctl fs/ioctl.c:751 [inline] __do_sys_ioctl fs/ioctl.c:762 [inline] __se_sys_ioctl+0x81/0x130 fs/ioctl.c:760 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:760 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 21002 Comm: syz-executor.4 Not tainted 5.8.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================