================================================================== BUG: KCSAN: data-race in __ptrace_unlink / do_exit write to 0xffff88812f639070 of 4 bytes by task 12594 on cpu 0: __ptrace_unlink+0x162/0x320 kernel/ptrace.c:133 __ptrace_detach+0x1b/0x1d0 kernel/ptrace.c:539 exit_ptrace+0x93/0x160 kernel/ptrace.c:599 forget_original_parent kernel/exit.c:628 [inline] exit_notify kernel/exit.c:668 [inline] do_exit+0x11ce/0x14a0 kernel/exit.c:845 do_group_exit+0xce/0x1a0 kernel/exit.c:922 get_signal+0xf93/0x15d0 kernel/signal.c:2868 arch_do_signal_or_restart+0x8c/0x280 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88812f639070 of 4 bytes by task 12588 on cpu 1: ptrace_event_enabled include/linux/ptrace.h:142 [inline] ptrace_event include/linux/ptrace.h:157 [inline] do_exit+0xff/0x14a0 kernel/exit.c:765 do_group_exit+0xce/0x1a0 kernel/exit.c:922 get_signal+0xf93/0x15d0 kernel/signal.c:2868 arch_do_signal_or_restart+0x8c/0x280 arch/x86/kernel/signal.c:865 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00010001 -> 0x00000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 12588 Comm: syz-executor.2 Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================