Hello, syzbot found the following issue on: HEAD commit: e9919e11 Merge branch 'for-linus' of git://git.kernel.org/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1217a83b100000 kernel config: https://syzkaller.appspot.com/x/.config?x=570eb530a65cd98e dashboard link: https://syzkaller.appspot.com/bug?extid=0f1e470df6a4316e0a11 compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b) Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0f1e470df6a4316e0a11@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in generic_file_buffered_read / generic_file_buffered_read write to 0xffff8880968747b0 of 8 bytes by task 6336 on cpu 0: generic_file_buffered_read+0x18be/0x19e0 mm/filemap.c:2246 generic_file_read_iter+0x7d/0x3e0 mm/filemap.c:2326 ext4_file_read_iter+0x2d6/0x420 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1902 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:312 do_splice_to fs/splice.c:870 [inline] splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950 do_splice_direct+0xf2/0x170 fs/splice.c:1059 do_sendfile+0x562/0xb10 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64 fs/read_write.c:1587 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880968747b0 of 8 bytes by task 6334 on cpu 1: generic_file_buffered_read+0x11e/0x19e0 mm/filemap.c:2011 generic_file_read_iter+0x7d/0x3e0 mm/filemap.c:2326 ext4_file_read_iter+0x2d6/0x420 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1902 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:312 do_splice_to fs/splice.c:870 [inline] splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950 do_splice_direct+0xf2/0x170 fs/splice.c:1059 do_sendfile+0x562/0xb10 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64 fs/read_write.c:1587 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 6334 Comm: syz-executor.0 Not tainted 5.8.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
