KCSAN: data-race in filemap_map_pages / generic_write

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in filemap_map_pages / generic_write_end (3)				103	832d	969d	0/24	auto-closed as invalid on 2021/03/26 14:55
upstream	KCSAN: data-race in filemap_map_pages / generic_write_end (2)				3	1083d	1139d	0/24	closed as invalid on 2020/06/18 14:24

================================================================== BUG: KCSAN: data-race in filemap_map_pages / generic_write_end write to 0xffff8881252027b8 of 8 bytes by task 10059 on cpu 0: i_size_write include/linux/fs.h:888 [inline] generic_write_end+0xd0/0x1f0 fs/buffer.c:2143 ext4_da_write_end+0x158/0x620 fs/ext4/inode.c:3189 generic_perform_write+0x1d3/0x320 mm/filemap.c:3316 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3434 ext4_file_write_iter+0x1bd/0xa00 fs/ext4/file.c:268 call_write_iter include/linux/fs.h:1895 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 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+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881252027b8 of 8 bytes by task 10067 on cpu 1: filemap_map_pages+0x812/0x990 mm/filemap.c:2664 do_fault_around mm/memory.c:3450 [inline] do_read_fault mm/memory.c:3484 [inline] do_fault mm/memory.c:3618 [inline] handle_pte_fault mm/memory.c:3849 [inline] __handle_mm_fault+0x2544/0x2c70 mm/memory.c:3973 handle_mm_fault+0x21b/0x530 mm/memory.c:4010 faultin_page mm/gup.c:640 [inline] __get_user_pages+0x485/0x1160 mm/gup.c:845 populate_vma_page_range+0xe6/0x100 mm/gup.c:1223 __mm_populate+0x168/0x2a0 mm/gup.c:1271 mm_populate include/linux/mm.h:2357 [inline] vm_mmap_pgoff+0x181/0x190 mm/util.c:501 ksys_mmap_pgoff+0x2d8/0x420 mm/mmap.c:1629 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:91 [inline] __x64_sys_mmap+0x2e/0x40 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 10067 Comm: syz-executor.2 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================