================================================================== BUG: KCSAN: data-race in __list_del_entry_valid / nfc_llcp_register_device write to 0xffff88811dedd408 of 8 bytes by task 31045 on cpu 1: __list_add include/linux/list.h:72 [inline] list_add include/linux/list.h:88 [inline] nfc_llcp_register_device+0x3e4/0x440 net/nfc/llcp_core.c:1604 nfc_register_device+0x67/0x190 net/nfc/core.c:1124 nci_register_device+0x4e6/0x570 net/nfc/nci/core.c:1257 virtual_ncidev_open+0xdc/0x140 drivers/nfc/virtual_ncidev.c:148 misc_open+0x1fd/0x230 drivers/char/misc.c:165 chrdev_open+0x349/0x3c0 fs/char_dev.c:414 do_dentry_open+0x5b3/0x930 fs/open.c:920 vfs_open+0x47/0x50 fs/open.c:1051 do_open fs/namei.c:3560 [inline] path_openat+0x17e6/0x1d00 fs/namei.c:3715 do_filp_open+0xf6/0x200 fs/namei.c:3742 do_sys_openat2+0xb5/0x2a0 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_openat fs/open.c:1380 [inline] __se_sys_openat fs/open.c:1375 [inline] __x64_sys_openat+0xf3/0x120 fs/open.c:1375 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff88811dedd408 of 8 bytes by task 31020 on cpu 0: __list_del_entry_valid+0x15/0xe0 lib/list_debug.c:46 __list_del_entry include/linux/list.h:134 [inline] list_del include/linux/list.h:148 [inline] local_release net/nfc/llcp_core.c:172 [inline] kref_put include/linux/kref.h:65 [inline] nfc_llcp_local_put net/nfc/llcp_core.c:182 [inline] nfc_llcp_unregister_device+0x7e/0x130 net/nfc/llcp_core.c:1620 nfc_unregister_device+0xe6/0x130 net/nfc/core.c:1179 nci_unregister_device+0x14c/0x160 net/nfc/nci/core.c:1303 virtual_ncidev_close+0x30/0x50 drivers/nfc/virtual_ncidev.c:163 __fput+0x245/0x570 fs/file_table.c:321 ____fput+0x15/0x20 fs/file_table.c:349 task_work_run+0x123/0x160 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xcf/0xe0 kernel/entry/common.c:171 exit_to_user_mode_prepare+0x6a/0xa0 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0xffffffff85eac140 -> 0xffff88811d5fdc00 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 31020 Comm: syz-executor.3 Not tainted 6.3.0-rc1-syzkaller-00106-g44889ba56cbb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 ==================================================================