Hello, syzbot found the following issue on: HEAD commit: fc80c51f Merge tag 'kbuild-v5.9' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13cb73fa900000 kernel config: https://syzkaller.appspot.com/x/.config?x=997a92ee4b5588ef dashboard link: https://syzkaller.appspot.com/bug?extid=0d4522639ba75b02bf19 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+0d4522639ba75b02bf19@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KCSAN: data-race in __xa_clear_mark / xas_find_marked write to 0xffff8880bace9b30 of 8 bytes by interrupt on cpu 1: instrument_write include/linux/instrumented.h:42 [inline] __test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:85 [inline] node_clear_mark lib/xarray.c:100 [inline] xas_clear_mark lib/xarray.c:908 [inline] __xa_clear_mark+0x229/0x350 lib/xarray.c:1726 test_clear_page_writeback+0x28d/0x480 mm/page-writeback.c:2739 end_page_writeback+0xa7/0x110 mm/filemap.c:1369 page_endio+0x1aa/0x1e0 mm/filemap.c:1400 mpage_end_io+0x186/0x1d0 fs/mpage.c:54 bio_endio+0x28a/0x370 block/bio.c:1447 req_bio_endio block/blk-core.c:259 [inline] blk_update_request+0x535/0xbd0 block/blk-core.c:1576 blk_mq_end_request+0x22/0x50 block/blk-mq.c:562 lo_complete_rq+0xca/0x180 drivers/block/loop.c:500 blk_done_softirq+0x1a5/0x200 block/blk-mq.c:586 __do_softirq+0x198/0x360 kernel/softirq.c:298 run_ksoftirqd+0x2f/0x60 kernel/softirq.c:652 smpboot_thread_fn+0x347/0x530 kernel/smpboot.c:165 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffff8880bace9b30 of 8 bytes by task 12715 on cpu 0: xas_find_chunk include/linux/xarray.h:1625 [inline] xas_find_marked+0x22f/0x6b0 lib/xarray.c:1198 find_get_pages_range_tag+0xa3/0x580 mm/filemap.c:1976 pagevec_lookup_range_tag+0x37/0x50 mm/swap.c:1120 __filemap_fdatawait_range+0xab/0x1b0 mm/filemap.c:519 filemap_fdatawait_range mm/filemap.c:554 [inline] filemap_write_and_wait_range+0x119/0x2a0 mm/filemap.c:664 generic_file_read_iter+0x11d/0x3e0 mm/filemap.c:2375 call_read_iter include/linux/fs.h:1866 [inline] generic_file_splice_read+0x22b/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+0x56a/0xba0 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1595 [inline] __se_sys_sendfile64 fs/read_write.c:1587 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1587 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: 0 PID: 12715 Comm: syz-executor.4 Not tainted 5.8.0-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.
