------------[ cut here ]------------
!valid_signal(sig)
WARNING: kernel/signal.c:2174 at do_notify_parent+0xd18/0xe30 kernel/signal.c:2174, CPU#1: syz.1.3032/16353
Modules linked in:
CPU: 1 UID: 0 PID: 16353 Comm: syz.1.3032 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:do_notify_parent+0xd18/0xe30 kernel/signal.c:2174
Code: c6 05 08 81 92 0e 01 48 c7 c7 60 3a cb 8b be a3 08 00 00 48 c7 c2 e0 3b cb 8b e8 c3 8c 17 00 e9 2e fa ff ff e8 99 45 3b 00 90 <0f> 0b 90 45 31 e4 e9 1c ff ff ff e8 88 45 3b 00 90 0f 0b 90 e9 db
RSP: 0018:ffffc900069579e0 EFLAGS: 00010093
RAX: ffffffff818a7917 RBX: dffffc0000000000 RCX: ffff88805c31dc40
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000000000040
RBP: ffffc90006957b30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000d2af58 R12: ffff88802df44150
R13: ffff88805c31dc40 R14: 0000000000000080 R15: 1ffff92000d2af44
FS:  0000000000000000(0000) GS:ffff888125325000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557f37d7d0 CR3: 000000007f67c000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 exit_notify kernel/exit.c:757 [inline]
 do_exit+0x13f1/0x22c0 kernel/exit.c:987
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1117
 get_signal+0x1284/0x1330 kernel/signal.c:3037
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:252 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:323 [inline]
 irqentry_exit+0x284/0x730 kernel/entry/common.c:162
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f1b2959c821
Code: Unable to access opcode bytes at 0x7f1b2959c7f7.
RSP: 002b:00000000fffffdb0 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f1b29816090 RCX: 00007f1b2959c819
RDX: 0000000000000000 RSI: 00000000fffffdb0 RDI: 0000000082160480
RBP: 00007f1b29632c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f1b29816128 R14: 00007f1b29816090 R15: 00007ffc81b16c88
 </TASK>