KCSAN: data-race in filemap_fault / simple_write

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in filemap_fault / simple_write_end (2) fs				2	667d	669d	0/26	auto-closed as invalid on 2022/08/03 16:13

================================================================== BUG: KCSAN: data-race in filemap_fault / simple_write_end read to 0xffff8880b2a23d08 of 8 bytes by task 10183 on cpu 1: filemap_fault+0x62d/0x10a0 mm/filemap.c:2552 __do_fault+0xae/0x1f0 mm/memory.c:3188 do_shared_fault mm/memory.c:3640 [inline] do_fault mm/memory.c:3718 [inline] handle_pte_fault mm/memory.c:3945 [inline] __handle_mm_fault+0x1ddb/0x2e00 mm/memory.c:4075 handle_mm_fault+0x21b/0x530 mm/memory.c:4112 do_user_addr_fault arch/x86/mm/fault.c:1441 [inline] __do_page_fault+0x456/0x8d0 arch/x86/mm/fault.c:1506 do_page_fault+0x38/0x194 arch/x86/mm/fault.c:1530 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203 copy_user_enhanced_fast_string+0xe/0x30 arch/x86/lib/copy_user_64.S:204 copy_page_to_iter_iovec lib/iov_iter.c:211 [inline] copy_page_to_iter+0x252/0x8d0 lib/iov_iter.c:920 generic_file_buffered_read mm/filemap.c:2144 [inline] generic_file_read_iter+0x978/0x1440 mm/filemap.c:2324 call_read_iter include/linux/fs.h:1896 [inline] new_sync_read+0x389/0x4f0 fs/read_write.c:414 __vfs_read+0xb1/0xc0 fs/read_write.c:427 vfs_read fs/read_write.c:461 [inline] vfs_read+0x143/0x2c0 fs/read_write.c:446 ksys_read+0xd5/0x1b0 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x4c/0x60 fs/read_write.c:595 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff8880b2a23d08 of 8 bytes by task 10186 on cpu 0: i_size_write include/linux/fs.h:888 [inline] simple_write_end+0x1d0/0x370 fs/libfs.c:517 generic_perform_write+0x1d3/0x320 mm/filemap.c:3320 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3438 generic_file_write_iter+0x28c/0x38c mm/filemap.c:3470 call_write_iter include/linux/fs.h:1902 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 do_iter_write fs/read_write.c:970 [inline] do_iter_write+0x13b/0x3c0 fs/read_write.c:951 vfs_iter_write+0x5c/0x80 fs/read_write.c:983 iter_file_splice_write+0x530/0x840 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0xa0/0xc0 fs/splice.c:1037 splice_direct_to_actor+0x22b/0x540 fs/splice.c:992 do_splice_direct+0x161/0x1e0 fs/splice.c:1080 do_sendfile+0x384/0x7f0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1519 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0xbe/0x140 fs/read_write.c:1511 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 10186 Comm: syz-executor.0 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================