================================================================== BUG: KCSAN: data-race in __xa_clear_mark / xas_find_marked read-write to 0xffff888106b25900 of 8 bytes by interrupt on cpu 1: instrument_read_write include/linux/instrumented.h:55 [inline] __instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:84 [inline] ___test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:114 [inline] node_clear_mark lib/xarray.c:102 [inline] xas_clear_mark lib/xarray.c:922 [inline] __xa_clear_mark+0xf5/0x1e0 lib/xarray.c:2097 __folio_end_writeback+0x177/0x470 mm/page-writeback.c:3024 folio_end_writeback+0x71/0x3d0 mm/filemap.c:1660 ext4_finish_bio+0x459/0x8c0 fs/ext4/page-io.c:144 ext4_end_bio+0x22a/0x330 fs/ext4/page-io.c:-1 bio_endio+0x374/0x410 block/bio.c:1645 blk_update_request+0x336/0x730 block/blk-mq.c:987 scsi_end_request+0x53/0x4c0 drivers/scsi/scsi_lib.c:637 scsi_io_completion+0x7f/0x200 drivers/scsi/scsi_lib.c:1078 scsi_finish_command+0x1c7/0x1e0 drivers/scsi/scsi.c:198 scsi_complete+0xc3/0x1e0 drivers/scsi/scsi_lib.c:1547 blk_complete_reqs block/blk-mq.c:1224 [inline] blk_done_softirq+0x77/0xb0 block/blk-mq.c:1229 handle_softirqs+0xb7/0x290 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0x3a/0xc0 kernel/softirq.c:680 common_interrupt+0x83/0x90 arch/x86/kernel/irq.c:285 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 kcsan_setup_watchpoint+0x415/0x430 kernel/kcsan/core.c:705 scm_set_cred include/net/scm.h:72 [inline] __unix_dgram_recvmsg+0x5d6/0x840 net/unix/af_unix.c:2567 unix_dgram_recvmsg+0x81/0x90 net/unix/af_unix.c:2616 sock_recvmsg_nosec+0x104/0x130 net/socket.c:1017 ____sys_recvmsg+0x26f/0x280 net/socket.c:2784 ___sys_recvmsg+0x11f/0x370 net/socket.c:2828 do_recvmmsg+0x1ef/0x540 net/socket.c:2923 __sys_recvmmsg net/socket.c:2997 [inline] __do_sys_recvmmsg net/socket.c:3020 [inline] __se_sys_recvmmsg net/socket.c:3013 [inline] __x64_sys_recvmmsg+0xe5/0x170 net/socket.c:3013 x64_sys_call+0x1c6a/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:300 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff888106b25900 of 8 bytes by task 10828 on cpu 0: xas_find_chunk include/linux/xarray.h:1752 [inline] xas_find_marked+0x218/0x620 lib/xarray.c:1510 find_get_entry+0x5d/0x380 mm/filemap.c:2038 filemap_get_folios_tag+0x13b/0x210 mm/filemap.c:2306 __filemap_fdatawait_range mm/filemap.c:530 [inline] filemap_fdatawait_keep_errors+0x6c/0x180 mm/filemap.c:633 wait_sb_inodes fs/fs-writeback.c:2714 [inline] sync_inodes_sb+0x39c/0x440 fs/fs-writeback.c:2836 sync_inodes_one_sb+0x3d/0x50 fs/sync.c:77 __iterate_supers+0x10d/0x1f0 fs/super.c:924 iterate_supers+0x1f/0x30 fs/super.c:939 ksys_sync+0x5c/0xe0 fs/sync.c:102 __ia32_sys_sync+0xe/0x20 fs/sync.c:113 x64_sys_call+0x2e53/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:163 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f value changed: 0xfffffffe00000000 -> 0xfffffe0000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 10828 Comm: syz.6.2297 Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ==================================================================