================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / writeback_sb_inodes write to 0xffff888106aa5400 of 8 bytes by task 38 on cpu 0: writeback_sb_inodes+0x2da/0xad0 fs/fs-writeback.c:1905 wb_writeback+0x252/0x6e0 fs/fs-writeback.c:2092 wb_do_writeback fs/fs-writeback.c:2239 [inline] wb_workfn+0x1a8/0x8d0 fs/fs-writeback.c:2279 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x5b8/0xa40 kernel/workqueue.c:2706 worker_thread+0x525/0x730 kernel/workqueue.c:2787 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:243 read to 0xffff888106aa5400 of 8 bytes by task 3306 on cpu 1: __mark_inode_dirty+0x58/0x7d0 fs/fs-writeback.c:2434 mark_inode_dirty include/linux/fs.h:2382 [inline] dquot_alloc_space include/linux/quotaops.h:319 [inline] dquot_alloc_block include/linux/quotaops.h:336 [inline] ext4_mb_new_blocks+0x1041/0x21e0 fs/ext4/mballoc.c:6169 ext4_ext_map_blocks+0x10a1/0x33b0 fs/ext4/extents.c:4317 ext4_map_blocks+0x72a/0xf50 fs/ext4/inode.c:623 ext4_alloc_file_blocks+0x285/0x6f0 fs/ext4/extents.c:4494 ext4_fallocate+0x77e/0x1180 fs/ext4/extents.c:4791 vfs_fallocate+0x378/0x3e0 fs/open.c:328 do_vfs_ioctl+0x12e6/0x13a0 fs/ioctl.c:850 __do_sys_ioctl fs/ioctl.c:869 [inline] __se_sys_ioctl+0x81/0x140 fs/ioctl.c:857 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b value changed: 0x0000000000020007 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 3306 Comm: syz-executor.4 Not tainted 6.8.0-rc5-syzkaller-00381-g70ff1fe626a1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 ================================================================== syz-executor.4 (3306) used greatest stack depth: 11136 bytes left