================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / __mark_inode_dirty write to 0xffff888128c85200 of 8 bytes by task 7 on cpu 1: __mark_inode_dirty+0x5e6/0x940 fs/fs-writeback.c:2288 mark_inode_dirty_sync include/linux/fs.h:2188 [inline] dquot_claim_block include/linux/quotaops.h:367 [inline] ext4_da_update_reserve_space+0x31f/0x390 fs/ext4/inode.c:360 ext4_ext_map_blocks+0x1c92/0x20f0 fs/ext4/extents.c:4500 ext4_map_blocks+0x230/0xcf0 fs/ext4/inode.c:622 mpage_map_one_extent fs/ext4/inode.c:2365 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2418 [inline] ext4_writepages+0x108b/0x1d40 fs/ext4/inode.c:2772 do_writepages+0x6b/0x170 mm/page-writeback.c:2344 __writeback_single_inode+0xaa/0x910 fs/fs-writeback.c:1452 writeback_sb_inodes+0x4c8/0xa10 fs/fs-writeback.c:1716 wb_writeback+0x1f9/0x6a0 fs/fs-writeback.c:1892 wb_do_writeback fs/fs-writeback.c:2037 [inline] wb_workfn+0x215/0x970 fs/fs-writeback.c:2078 process_one_work+0x424/0x930 kernel/workqueue.c:2264 worker_thread+0x9a/0x7e0 kernel/workqueue.c:2410 kthread+0x1cb/0x1f0 kernel/kthread.c:255 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 read to 0xffff888128c85200 of 8 bytes by task 23795 on cpu 0: __mark_inode_dirty+0xb6/0x940 fs/fs-writeback.c:2272 mark_buffer_dirty+0x28b/0x2b0 fs/buffer.c:1156 __block_commit_write.isra.0+0x11d/0x170 fs/buffer.c:2081 block_write_end+0x6d/0x140 fs/buffer.c:2159 generic_write_end+0x8c/0x1f0 fs/buffer.c:2173 ext4_da_write_end+0x162/0x670 fs/ext4/inode.c:3092 generic_perform_write+0x1d7/0x320 mm/filemap.c:3298 ext4_buffered_write_iter+0x14e/0x280 fs/ext4/file.c:270 ext4_file_write_iter+0xf4/0xd30 fs/ext4/file.c:642 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write+0x303/0x400 fs/read_write.c:483 __vfs_write+0x9e/0xb0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x189/0x380 fs/read_write.c:542 ksys_write+0xc5/0x1a0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x49/0x60 fs/read_write.c:620 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 23795 Comm: syz-executor.3 Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================