------------[ cut here ]------------
!valid_signal(sig)
WARNING: kernel/signal.c:2174 at do_notify_parent+0xd49/0xe60 kernel/signal.c:2174, CPU#1: syz.4.8391/27584
Modules linked in:
CPU: 1 UID: 0 PID: 27584 Comm: syz.4.8391 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:do_notify_parent+0xd49/0xe60 kernel/signal.c:2174
Code: c6 05 91 cf e8 0d 01 48 c7 c7 80 53 4b 8b be a3 08 00 00 48 c7 c2 00 55 4b 8b e8 52 42 16 00 e9 25 fa ff ff e8 28 2e 3a 00 90 <0f> 0b 90 45 31 ed e9 16 ff ff ff e8 17 2e 3a 00 90 0f 0b 90 e9 af
RSP: 0000:ffffc90006557920 EFLAGS: 00010293
RAX: ffffffff818a3cd8 RBX: 1ffff92000caaf2c RCX: ffff88802d70bd80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90006557a70 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f1225f R12: ffff888030c00f10
R13: dffffc0000000000 R14: 0000000000000080 R15: ffff88802d70bd80
FS:  0000000000000000(0000) GS:ffff888126270000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555829614e8 CR3: 00000000370de000 CR4: 00000000003526f0
DR0: 0000000000000001 DR1: ffffffffffffffff DR2: 0000000000000006
DR3: 0000000000000101 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 exit_notify kernel/exit.c:758 [inline]
 do_exit+0x13f1/0x22c0 kernel/exit.c:988
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1119
 get_signal+0x1284/0x1330 kernel/signal.c:3037
 arch_do_signal_or_restart+0xbc/0x840 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:244 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
 irqentry_exit+0x289/0x760 kernel/entry/common.c:162
 exc_general_protection+0x16b/0x1f0 arch/x86/kernel/traps.c:914
 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:612
RIP: 0033:0x7eff73d7ce61
Code: Unable to access opcode bytes at 0x7eff73d7ce37.
RSP: 002b:0000200000000590 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007eff73ff5fa0 RCX: 00007eff73d7ce59
RDX: 0000000000000000 RSI: 0000200000000590 RDI: 0000000000800080
RBP: 00007eff73e12d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007eff73ff6038 R14: 00007eff73ff5fa0 R15: 00007ffdda334bb8
 </TASK>