syzbot

=====================================
WARNING: bad unlock balance detected!
syzkaller #0 Not tainted
-------------------------------------
syz.5.670/9738 is trying to release lock (&sighand->siglock) at:
[<ffffffff8179fde2>] spin_unlock include/linux/spinlock.h:391 [inline]
[<ffffffff8179fde2>] copy_process+0x6b72/0x7690 kernel/fork.c:2432
but there are no more locks to release!

other info that might help us debug this:
1 lock held by syz.5.670/9738:
 #0: ffffffff8e61ba50 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: copy_process+0x4ba7/0x7690 kernel/fork.c:2274

stack backtrace:
CPU: 1 UID: 0 PID: 9738 Comm: syz.5.670 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_unlock_imbalance_bug kernel/locking/lockdep.c:5298 [inline]
 print_unlock_imbalance_bug+0x11b/0x130 kernel/locking/lockdep.c:5272
 __lock_release kernel/locking/lockdep.c:5537 [inline]
 lock_release+0x242/0x2f0 kernel/locking/lockdep.c:5889
 __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
 _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_process+0x6b72/0x7690 kernel/fork.c:2432
 kernel_clone+0xfc/0x930 kernel/fork.c:2605
 __do_sys_clone3+0x212/0x290 kernel/fork.c:2909
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f715e1c3409
Code: d8 08 00 48 8d 3d 3c d8 08 00 e8 12 29 f6 ff 66 90 b8 ea ff ff ff 48 85 ff 74 2c 48 85 d2 74 27 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 18 74 01 c3 31 ed 48 83 e4 f0 4c 89 c7 ff d2 48 89 c7
RSP: 002b:00007fffb1cc20e8 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f715e145820 RCX: 00007f715e1c3409
RDX: 00007f715e145820 RSI: 0000000000000058 RDI: 00007fffb1cc2130
RBP: 00007f715f07a6c0 R08: 00007f715f07a6c0 R09: 00007fffb1cc2217
R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffa8
R13: 000000000000000b R14: 00007fffb1cc2130 R15: 00007fffb1cc2218
 </TASK>
------------[ cut here ]------------
pvqspinlock: lock 0xffff888030c55340 has corrupted value 0x0!
WARNING: CPU: 0 PID: 9738 at kernel/locking/qspinlock_paravirt.h:504 __pv_queued_spin_unlock_slowpath+0x237/0x330 kernel/locking/qspinlock_paravirt.h:504
Modules linked in:
CPU: 0 UID: 0 PID: 9738 Comm: syz.5.670 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__pv_queued_spin_unlock_slowpath+0x237/0x330 kernel/locking/qspinlock_paravirt.h:504
Code: 03 0f b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 67 41 8b 55 00 4c 89 ee 48 c7 c7 40 83 ad 8b e8 2a db e4 f5 90 <0f> 0b 90 90 e9 64 ff ff ff 90 0f 0b 48 89 df 4c 89 04 24 e8 71 a1
RSP: 0018:ffffc900043ef9c8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: ffff888030c55340 RCX: ffffffff817a3388
RDX: ffff88802af40000 RSI: ffffffff817a3395 RDI: 0000000000000001
RBP: ffff888030c55348 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 6c6e697073717670 R12: ffff888030c55350
R13: ffff888030c55340 R14: 00000000003d0f00 R15: ffff888052c93c00
FS:  000055557e39b500(0000) GS:ffff8881246b6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055556797c808 CR3: 000000007736f000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __raw_callee_save___pv_queued_spin_unlock_slowpath+0x15/0x30
 .slowpath+0x9/0x18
 pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:562 [inline]
 queued_spin_unlock arch/x86/include/asm/qspinlock.h:57 [inline]
 do_raw_spin_unlock+0x172/0x230 kernel/locking/spinlock_debug.c:142
 __raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:391 [inline]
 copy_process+0x6b72/0x7690 kernel/fork.c:2432
 kernel_clone+0xfc/0x930 kernel/fork.c:2605
 __do_sys_clone3+0x212/0x290 kernel/fork.c:2909
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f715e1c3409
Code: d8 08 00 48 8d 3d 3c d8 08 00 e8 12 29 f6 ff 66 90 b8 ea ff ff ff 48 85 ff 74 2c 48 85 d2 74 27 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 18 74 01 c3 31 ed 48 83 e4 f0 4c 89 c7 ff d2 48 89 c7
RSP: 002b:00007fffb1cc20e8 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f715e145820 RCX: 00007f715e1c3409
RDX: 00007f715e145820 RSI: 0000000000000058 RDI: 00007fffb1cc2130
RBP: 00007f715f07a6c0 R08: 00007f715f07a6c0 R09: 00007fffb1cc2217
R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffa8
R13: 000000000000000b R14: 00007fffb1cc2130 R15: 00007fffb1cc2218
 </TASK>