================================================================== BUG: KMSAN: uninit-value in copy_siginfo_to_user+0x9cd/0x12c0 kernel/signal.c:2870 CPU: 0 PID: 8121 Comm: syz-executor1 Not tainted 4.17.0+ #22 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:113 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:990 __msan_warning_32+0x70/0xc0 mm/kmsan/kmsan_instr.c:640 copy_siginfo_to_user+0x9cd/0x12c0 kernel/signal.c:2870 ptrace_peek_siginfo kernel/ptrace.c:741 [inline] ptrace_request+0x2032/0x2430 kernel/ptrace.c:912 arch_ptrace+0xbcc/0x12c0 arch/x86/kernel/ptrace.c:877 __do_sys_ptrace kernel/ptrace.c:1145 [inline] __se_sys_ptrace+0x309/0x850 kernel/ptrace.c:1110 __x64_sys_ptrace+0x11e/0x170 kernel/ptrace.c:1110 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455ba9 RSP: 002b:00007fa75c451c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000065 RAX: ffffffffffffffda RBX: 00007fa75c4526d4 RCX: 0000000000455ba9 RDX: 0000000000730004 RSI: 0000000000000001 RDI: 0000000000004209 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c09e5 R14: 00000000004d0728 R15: 0000000000000000 Local variable description: ----kiov@ptrace_request Variable was created at: ptrace_request+0x197/0x2430 kernel/ptrace.c:885 arch_ptrace+0xbcc/0x12c0 arch/x86/kernel/ptrace.c:877 ==================================================================