================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes write to 0xffff888131d0f1d8 of 8 bytes by task 31994 on cpu 1: writeback_sb_inodes+0x3cc/0xf10 fs/fs-writeback.c:1721 wb_writeback+0x28e/0x700 fs/fs-writeback.c:1905 wb_do_writeback+0x101/0x510 fs/fs-writeback.c:2050 wb_workfn+0xc8/0x520 fs/fs-writeback.c:2091 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276 worker_thread+0x636/0xae0 kernel/workqueue.c:2422 kthread+0x1d0/0x1f0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff888131d0f1d8 of 8 bytes by task 10230 on cpu 0: __mark_inode_dirty+0xda/0x6c0 fs/fs-writeback.c:2295 mark_inode_dirty_sync include/linux/fs.h:2409 [inline] dquot_free_space include/linux/quotaops.h:382 [inline] dquot_free_block include/linux/quotaops.h:392 [inline] ext4_mb_new_blocks+0x16cc/0x1f90 fs/ext4/mballoc.c:5562 ext4_ext_map_blocks+0x1569/0x1f00 fs/ext4/extents.c:4241 ext4_map_blocks+0x70d/0xef0 fs/ext4/inode.c:638 ext4_alloc_file_blocks+0x271/0x720 fs/ext4/extents.c:4428 ext4_zero_range+0x309/0xa40 fs/ext4/extents.c:4540 ext4_fallocate+0x226/0x4d0 fs/ext4/extents.c:4677 vfs_fallocate+0x463/0x660 fs/open.c:311 ksys_fallocate fs/open.c:334 [inline] __do_sys_fallocate fs/open.c:342 [inline] __se_sys_fallocate fs/open.c:340 [inline] __x64_sys_fallocate+0x75/0xc0 fs/open.c:340 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000020007 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10230 Comm: syz-executor.3 Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================