------------[ cut here ]------------
!valid_signal(sig)
WARNING: kernel/signal.c:2174 at do_notify_parent+0xd18/0xe30 kernel/signal.c:2174, CPU#1: syz.4.94/6062
Modules linked in:
CPU: 1 UID: 0 PID: 6062 Comm: syz.4.94 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:do_notify_parent+0xd18/0xe30 kernel/signal.c:2174
Code: c6 05 d0 51 90 0e 01 48 c7 c7 e0 3a cb 8b be a3 08 00 00 48 c7 c2 60 3c cb 8b e8 b3 91 17 00 e9 2e fa ff ff e8 29 58 3b 00 90 <0f> 0b 90 45 31 e4 e9 1c ff ff ff e8 18 58 3b 00 90 0f 0b 90 e9 db
RSP: 0018:ffffc9000fc97c00 EFLAGS: 00010093
RAX: ffffffff818a5dd7 RBX: dffffc0000000000 RCX: ffff888028fabd80
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000000000040
RBP: ffffc9000fc97d50 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52001f92f9c R12: ffff88801cbff410
R13: ffff888028fabd80 R14: 0000000000000080 R15: 1ffff92001f92f88
FS:  0000000000000000(0000) GS:ffff888125387000(0000) knlGS:0000000000000000
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7217810 CR3: 000000001df88000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 exit_notify kernel/exit.c:758 [inline]
 do_exit+0x13f1/0x22c0 kernel/exit.c:988
 __do_sys_exit kernel/exit.c:1086 [inline]
 __se_sys_exit kernel/exit.c:1084 [inline]
 __ia32_sys_exit+0x40/0x40 kernel/exit.c:1084
 ia32_sys_call+0x2211/0x2230 arch/x86/include/generated/asm/syscalls_32.h:2
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x229/0x6e0 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf705f01c
Code: Unable to access opcode bytes at 0xf705eff2.
RSP: 002b:00000000f544d4cc EFLAGS: 00000206 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000f544d5ec
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f544d5f4
RBP: 00000000f7085439 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>