------------[ cut here ]------------
!valid_signal(sig)
WARNING: kernel/signal.c:2174 at do_notify_parent+0xd18/0xe30 kernel/signal.c:2174, CPU#0: syz.0.91/6186
Modules linked in:
CPU: 0 UID: 0 PID: 6186 Comm: syz.0.91 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+0xd18/0xe30 kernel/signal.c:2174
Code: c6 05 18 08 b2 0e 01 48 c7 c7 80 4c eb 8b be a3 08 00 00 48 c7 c2 00 4e eb 8b e8 93 6e 17 00 e9 2e fa ff ff e8 19 1e 3b 00 90 <0f> 0b 90 45 31 e4 e9 1c ff ff ff e8 08 1e 3b 00 90 0f 0b 90 e9 db
RSP: 0018:ffffc90005ce79e0 EFLAGS: 00010093
RAX: ffffffff818bc007 RBX: dffffc0000000000 RCX: ffff88802f121e80
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 0000000000000040
RBP: ffffc90005ce7b30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000b9cf58 R12: ffff88803794ecd0
R13: ffff88802f121e80 R14: 0000000000000080 R15: 1ffff92000b9cf44
FS:  0000000000000000(0000) GS:ffff888124de6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c42c1d2 CR3: 000000006d12e000 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:3036
 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: 0033:0x7fac58d9c7a1
Code: Unable to access opcode bytes at 0x7fac58d9c777.
RSP: 002b:0000000000000050 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fac59015fa0 RCX: 00007fac58d9c799
RDX: 0000000000000000 RSI: 0000000000000050 RDI: 00000000001e0080
RBP: 00007fac58e32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007fac59016038 R14: 00007fac59015fa0 R15: 00007fffa5b814d8
 </TASK>