===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- syz.7.754/10118 is trying to release lock (&sighand->siglock) at: [] spin_unlock include/linux/spinlock.h:391 [inline] [] 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.7.754/10118: #0: ffffffff8e61b890 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: copy_process+0x4ba7/0x7690 kernel/fork.c:2274 stack backtrace: CPU: 0 UID: 0 PID: 10118 Comm: syz.7.754 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: __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/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc1e27c3409 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:00007ffc5caca3f8 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007fc1e2745820 RCX: 00007fc1e27c3409 RDX: 00007fc1e2745820 RSI: 0000000000000058 RDI: 00007ffc5caca440 RBP: 00007fc1e360d6c0 R08: 00007fc1e360d6c0 R09: 00007ffc5caca527 R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffa8 R13: 000000000000000b R14: 00007ffc5caca440 R15: 00007ffc5caca528 ------------[ cut here ]------------ pvqspinlock: lock 0xffff88801f758000 has corrupted value 0x0! WARNING: CPU: 0 PID: 10118 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: 10118 Comm: syz.7.754 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 80 81 ad 8b e8 da fa e5 f5 90 <0f> 0b 90 90 e9 64 ff ff ff 90 0f 0b 48 89 df 4c 89 04 24 e8 51 6c RSP: 0018:ffffc90002e579c8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88801f758000 RCX: ffffffff817a02f8 RDX: ffff8880280d1e00 RSI: ffffffff817a0305 RDI: 0000000000000001 RBP: ffff88801f758008 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff88801f758010 R13: ffff88801f758000 R14: 00000000003d0f00 R15: ffff888083a61e00 FS: 00005555831cc500(0000) GS:ffff8881246bd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055b6e5d06000 CR3: 0000000037750000 CR4: 00000000003526f0 Call Trace: __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/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc1e27c3409 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:00007ffc5caca3f8 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007fc1e2745820 RCX: 00007fc1e27c3409 RDX: 00007fc1e2745820 RSI: 0000000000000058 RDI: 00007ffc5caca440 RBP: 00007fc1e360d6c0 R08: 00007fc1e360d6c0 R09: 00007ffc5caca527 R10: 0000000000000008 R11: 0000000000000202 R12: ffffffffffffffa8 R13: 000000000000000b R14: 00007ffc5caca440 R15: 00007ffc5caca528