===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- syz.7.170/7134 is trying to release lock (&sighand->siglock) at: [] spin_unlock include/linux/spinlock_rt.h:105 [inline] [] copy_process+0x2697/0x3ae0 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.7.170/7134: #0: ffffffff8d9e0a30 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: copy_process+0x2034/0x3ae0 kernel/fork.c:2274 stack backtrace: CPU: 0 UID: 0 PID: 7134 Comm: syz.7.170 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 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 rt_spin_unlock+0x16/0x80 kernel/locking/spinlock_rt.c:80 spin_unlock include/linux/spinlock_rt.h:105 [inline] copy_process+0x2697/0x3ae0 kernel/fork.c:2432 kernel_clone+0x224/0x7c0 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: 0033:0x7f1f39433409 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:00007ffc1caa2088 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f1f393b5820 RCX: 00007f1f39433409 RDX: 00007f1f393b5820 RSI: 0000000000000058 RDI: 00007ffc1caa20d0 RBP: 00007f1f376666c0 R08: 00007f1f376666c0 R09: 00007ffc1caa21b7 R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffa8 R13: 000000000000000b R14: 00007ffc1caa20d0 R15: 00007ffc1caa21b8 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7134 at kernel/sched/core.c:2418 migrate_enable+0x30e/0x3c0 kernel/sched/core.c:2418 Modules linked in: CPU: 0 UID: 0 PID: 7134 Comm: syz.7.170 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:migrate_enable+0x30e/0x3c0 kernel/sched/core.c:2418 Code: 00 00 00 65 48 8b 05 01 f2 65 10 48 3b 84 24 a0 00 00 00 75 46 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 90 <0f> 0b 90 49 bc 00 00 00 00 00 fc ff df eb af 89 d1 80 e1 07 fe c1 RSP: 0018:ffffc9000b9b78a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 1ffff1100bbb17f8 RCX: dffffc0000000000 RDX: ffff88805dd8bfc0 RSI: ffffffff8d21a502 RDI: ffffffff8b621000 RBP: ffffc9000b9b79a0 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1b10884 R12: ffff88805dd8bfb0 R13: 1ffff92001736f1c R14: ffff88805dd8bb80 R15: 0000000000000000 FS: 0000555575e64500(0000) GS:ffff8881268bf000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555566622588 CR3: 0000000040d0a000 CR4: 00000000003526f0 Call Trace: rt_spin_unlock+0x1b/0x80 kernel/locking/spinlock_rt.c:81 spin_unlock include/linux/spinlock_rt.h:105 [inline] copy_process+0x2697/0x3ae0 kernel/fork.c:2432 kernel_clone+0x224/0x7c0 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: 0033:0x7f1f39433409 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:00007ffc1caa2088 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f1f393b5820 RCX: 00007f1f39433409 RDX: 00007f1f393b5820 RSI: 0000000000000058 RDI: 00007ffc1caa20d0 RBP: 00007f1f376666c0 R08: 00007f1f376666c0 R09: 00007ffc1caa21b7 R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffa8 R13: 000000000000000b R14: 00007ffc1caa20d0 R15: 00007ffc1caa21b8