[syzbot] [kernel?] WARNING in do_exit

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3b3bea6d4b9c Merge tag 'cgroup-for-7.1-rc1-fixes' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=105a7236580000
kernel config: https://syzkaller.appspot.com/x/.config?x=59da38148f3a3d24
dashboard link: https://syzkaller.appspot.com/bug?extid=8fdf0d8e10bdde1c2e88
compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-3b3bea6d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9e011051a02c/vmlinux-3b3bea6d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/dd9d977be0e6/bzImage-3b3bea6d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8fdf0d...@syzkaller.appspotmail.com

WARNING: kernel/signal.c:2174 at do_notify_parent+0xea8/0x10b0 kernel/signal.c:2174, CPU#2: syz.2.2072/13056
Kernel panic - n o t sync i n g : k e r n e l : panic_on_warn set ...
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
check_panic_on_warn kernel/panic.c:524 [inline]
check_panic_on_warn.cold+0x19/0x34 kernel/panic.c:519
__warn.cold+0x191/0x328 kernel/panic.c:1103
asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
RSP: 0018:ffffc9000f407aa8 EFLAGS: 00010093
RDX: ffff88805386ca00 RSI: ffffffff81caad07 RDI: ffff88805386ca00
R10: 0000000000000080 R11: 0000000000000000 R12: 1ffff92001e80f58
exit_notify kernel/exit.c:757 [inline]
do_exit+0x1b05/0x2a60 kernel/exit.c:987
get_signal+0x1ec7/0x21e0 kernel/signal.c:3037
asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:612
RSP: 002b:00002000000001e0 EFLAGS: 00010217
R13: 00007fcbfe616038 R14: 00007fcbfe615fa0 R15: 00007ffd58e78548
Kernel Offset: disabled
Rebooting in 86400 seconds..


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