===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- syz.2.1696/11855 is trying to release lock (&sighand->siglock) at: [] spin_unlock include/linux/spinlock.h:391 [inline] [] copy_process+0x2793/0x3c00 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.2.1696/11855: #0: ffffffff8e171810 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: copy_process+0x212a/0x3c00 kernel/fork.c:2274 stack backtrace: CPU: 1 UID: 0 PID: 11855 Comm: syz.2.1696 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_unlock_imbalance_bug+0xdc/0xf0 kernel/locking/lockdep.c:5298 __lock_release kernel/locking/lockdep.c:5537 [inline] lock_release+0x269/0x3e0 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+0x2793/0x3c00 kernel/fork.c:2432 kernel_clone+0x21e/0x840 kernel/fork.c:2605 __do_sys_clone3 kernel/fork.c:2909 [inline] __se_sys_clone3+0x256/0x2d0 kernel/fork.c:2888 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5f0f1c3409 Code: d8 08 00 48 8d 3d 1c 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:00007ffc3979b828 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f5f0f145820 RCX: 00007f5f0f1c3409 RDX: 00007f5f0f145820 RSI: 0000000000000058 RDI: 00007ffc3979b870 RBP: 00007f5f1005a6c0 R08: 00007f5f1005a6c0 R09: 00007ffc3979b957 R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffa8 R13: 000000000000000b R14: 00007ffc3979b870 R15: 00007ffc3979b958