KCSAN: data-race in ext4_setattr / filemap

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_setattr / filemap_fault ext4				2	946d	963d	0/26	auto-closed as invalid on 2021/10/27 08:46
upstream	KCSAN: data-race in ext4_setattr / filemap_fault (2) ext4				2	904d	905d	0/26	auto-closed as invalid on 2021/12/08 02:58

================================================================== BUG: KCSAN: data-race in ext4_setattr / filemap_fault write to 0xffff888134669718 of 8 bytes by task 10706 on cpu 0: i_size_write include/linux/fs.h:907 [inline] ext4_setattr+0xd6b/0xf00 fs/ext4/inode.c:5435 notify_change+0x924/0xbf0 fs/attr.c:410 do_truncate fs/open.c:65 [inline] do_sys_ftruncate+0x323/0x430 fs/open.c:193 __do_sys_ftruncate fs/open.c:204 [inline] __se_sys_ftruncate fs/open.c:202 [inline] __x64_sys_ftruncate+0x2f/0x40 fs/open.c:202 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888134669718 of 8 bytes by task 10704 on cpu 1: i_size_read include/linux/fs.h:885 [inline] filemap_fault+0x87/0x8b0 mm/filemap.c:3093 __do_fault mm/memory.c:3868 [inline] do_read_fault mm/memory.c:4183 [inline] do_fault mm/memory.c:4312 [inline] handle_pte_fault mm/memory.c:4570 [inline] __handle_mm_fault mm/memory.c:4705 [inline] handle_mm_fault+0xba6/0x1590 mm/memory.c:4803 do_user_addr_fault+0x617/0xb90 arch/x86/mm/fault.c:1397 handle_page_fault arch/x86/mm/fault.c:1484 [inline] exc_page_fault+0x91/0x290 arch/x86/mm/fault.c:1540 asm_exc_page_fault+0x1e/0x30 __get_user_4+0x1c/0x30 perf_copy_attr+0x34/0x650 kernel/events/core.c:11800 __do_sys_perf_event_open kernel/events/core.c:12129 [inline] __se_sys_perf_event_open+0xca/0x27c0 kernel/events/core.c:12102 __x64_sys_perf_event_open+0x63/0x70 kernel/events/core.c:12102 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000000 -> 0x0000000000008979 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 10704 Comm: syz-executor.5 Tainted: G W 5.17.0-rc2-syzkaller-00054-g27bb0b18c208 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================