------------[ cut here ]------------
!valid_signal(sig)
WARNING: kernel/signal.c:2174 at do_notify_parent+0xd18/0xe30 kernel/signal.c:2174, CPU#0: syz.4.1463/11429
Modules linked in:
CPU: 0 UID: 0 PID: 11429 Comm: syz.4.1463 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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:ffffc9000391fc40 EFLAGS: 00010093
RAX: ffffffff818a5dd7 RBX: dffffc0000000000 RCX: ffff88802a1e9ec0
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000000000040
RBP: ffffc9000391fd90 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000723fa4 R12: ffff88802b552450
R13: ffff88802a1e9ec0 R14: 0000000000000080 R15: 1ffff92000723f90
FS:  0000000000000000(0000) GS:ffff888125287000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8964e52b20 CR3: 000000003c530000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000009951
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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]
 __x64_sys_exit+0x40/0x40 kernel/exit.c:1084
 x64_sys_call+0x2231/0x2240 arch/x86/include/generated/asm/syscalls_64.h:61
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8964f9ce59
Code: Unable to access opcode bytes at 0x7f8964f9ce2f.
RSP: 002b:0000200000004618 EFLAGS: 00000246 ORIG_RAX: 000000000000003c
RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f8964f9ce59
RDX: 00007f8964f9ce59 RSI: 0000200000004640 RDI: 000000000000000b
RBP: 00007f8965032d6f R08: 0000200000004c80 R09: 88e6973e88de2102
R10: 0000200000004c80 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8965216038 R14: 00007f8965215fa0 R15: 00007f896533fa48
 </TASK>