================================================================== BUG: KCSAN: data-race in prepare_signal / ptrace_attach write to 0xffff88811eb980a8 of 4 bytes by task 22907 on cpu 0: ptrace_attach+0x217/0x4a0 kernel/ptrace.c:413 __do_sys_ptrace kernel/ptrace.c:1262 [inline] __se_sys_ptrace+0xc1/0x2d0 kernel/ptrace.c:1242 __x64_sys_ptrace+0x51/0x60 kernel/ptrace.c:1242 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88811eb980a8 of 4 bytes by task 22911 on cpu 1: sig_ignored kernel/signal.c:116 [inline] prepare_signal+0x791/0xdb0 kernel/signal.c:961 __send_signal+0x64/0x7d0 kernel/signal.c:1081 send_signal+0x398/0x3e0 kernel/signal.c:1241 do_send_sig_info+0x9b/0xe0 kernel/signal.c:1290 do_send_specific kernel/signal.c:3780 [inline] do_tkill kernel/signal.c:3806 [inline] __do_sys_tkill kernel/signal.c:3841 [inline] __se_sys_tkill+0x12e/0x180 kernel/signal.c:3835 __x64_sys_tkill+0x2d/0x40 kernel/signal.c:3835 do_syscall_64+0x71/0x120 arch/x86/entry/common.c:359 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 22911 Comm: syz-executor.2 Not tainted 5.8.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================