================================================================== BUG: KCSAN: data-race in __add_to_page_cache_locked / ext4_writepages read-write to 0xffff88800a4e9358 of 8 bytes by task 23059 on cpu 0: __add_to_page_cache_locked+0x39d/0x7b0 mm/filemap.c:888 add_to_page_cache_lru+0xa0/0x1b0 mm/filemap.c:939 generic_file_buffered_read+0xf29/0x23a0 mm/filemap.c:2455 generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2553 ext4_file_read_iter+0x2d0/0x420 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1897 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5db/0xca0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88800a4e9358 of 8 bytes by task 23066 on cpu 1: ext4_writepages+0x131/0x1e30 fs/ext4/inode.c:2660 do_writepages+0x7b/0x150 mm/page-writeback.c:2352 __filemap_fdatawrite_range+0x19d/0x1d0 mm/filemap.c:422 filemap_write_and_wait_range+0x8b/0x2a0 mm/filemap.c:655 __iomap_dio_rw+0x38c/0x9b0 fs/iomap/direct-io.c:489 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:605 ext4_dio_write_iter fs/ext4/file.c:552 [inline] ext4_file_write_iter+0xe06/0x1090 fs/ext4/file.c:662 call_write_iter include/linux/fs.h:1903 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4b0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x42a/0x780 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:933 splice_direct_to_actor+0x345/0x650 fs/splice.c:888 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5db/0xca0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 23066 Comm: syz-executor.1 Not tainted 5.10.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================