================================================================== BUG: KCSAN: data-race in ondemand_readahead / ondemand_readahead write to 0xffff88802ccc9e98 of 8 bytes by task 14616 on cpu 1: ondemand_readahead+0x23f/0x780 mm/readahead.c:526 page_cache_sync_ra+0x18f/0x1a0 mm/readahead.c:577 page_cache_sync_readahead include/linux/pagemap.h:840 [inline] filemap_get_pages+0x1ba/0x660 mm/filemap.c:2375 filemap_read+0x1ba/0x7b0 mm/filemap.c:2458 generic_file_read_iter+0x82/0x410 mm/filemap.c:2609 call_read_iter include/linux/fs.h:1971 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88802ccc9e98 of 8 bytes by task 14627 on cpu 0: ondemand_readahead+0x15e/0x780 mm/readahead.c:462 page_cache_sync_ra+0x18f/0x1a0 mm/readahead.c:577 page_cache_sync_readahead include/linux/pagemap.h:840 [inline] filemap_get_pages+0x1ba/0x660 mm/filemap.c:2375 filemap_read+0x1ba/0x7b0 mm/filemap.c:2458 generic_file_read_iter+0x82/0x410 mm/filemap.c:2609 call_read_iter include/linux/fs.h:1971 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x7a6/0xe20 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 14627 Comm: syz-executor.2 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================