------------[ cut here ]------------
!valid_signal(sig)
WARNING: kernel/signal.c:2174 at do_notify_parent+0xc7e/0xd70 kernel/signal.c:2174, CPU#0: syz.1.522/7758
Modules linked in:
CPU: 0 UID: 0 PID: 7758 Comm: syz.1.522 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:do_notify_parent+0xc7e/0xd70 kernel/signal.c:2174
Code: c6 05 7c 06 93 0e 01 48 c7 c7 c0 46 cb 8b be a3 08 00 00 48 c7 c2 40 48 cb 8b e8 6d 6e 17 00 e9 c6 fa ff ff e8 b3 1b 3b 00 90 <0f> 0b 90 45 31 e4 e9 1c ff ff ff e8 a2 1b 3b 00 90 0f 0b 90 e9 75
RSP: 0018:ffffc90003a479e0 EFLAGS: 00010093
RAX: ffffffff818aed1d RBX: dffffc0000000000 RCX: ffff88802f96bd00
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000000000040
RBP: ffffc90003a47b30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000748f58 R12: ffff888033034150
R13: ffff88802f96bd00 R14: 0000000000000080 R15: 1ffff92000748f44
FS:  0000000000000000(0000) GS:ffff888124ff5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4f4af81fd0 CR3: 00000000799b0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 exit_notify kernel/exit.c:756 [inline]
 do_exit+0x15b3/0x2580 kernel/exit.c:986
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1116
 get_signal+0x1284/0x1330 kernel/signal.c:3032
 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:238 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:283 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:352 [inline]
 irqentry_exit+0x188/0x700 kernel/entry/common.c:219
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 002b:0000200000000088 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f0442416180 RCX: 00007f044219c799
RDX: 0000000000000000 RSI: 0000200000000080 RDI: 0000000000000080
RBP: 00007f0442232bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f0442416218 R14: 00007f0442416180 R15: 00007ffe5ad3e0d8
 </TASK>