===================================== WARNING: bad unlock balance detected! 6.15.0-syzkaller-12426-ge271ed52b344 #0 Not tainted ------------------------------------- syz.3.1041/10038 is trying to release lock (&sighand->siglock) at: [] spin_unlock include/linux/spinlock.h:391 [inline] [] copy_process+0x6b74/0x76a0 kernel/fork.c:2426 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz.3.1041/10038: #0: ffffffff8e61ecd0 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: copy_process+0x4ba7/0x76a0 kernel/fork.c:2268 stack backtrace: CPU: 0 UID: 0 PID: 10038 Comm: syz.3.1041 Not tainted 6.15.0-syzkaller-12426-ge271ed52b344 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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:5301 [inline] print_unlock_imbalance_bug+0x11b/0x130 kernel/locking/lockdep.c:5275 __lock_release kernel/locking/lockdep.c:5540 [inline] lock_release+0x242/0x2f0 kernel/locking/lockdep.c:5892 __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+0x6b74/0x76a0 kernel/fork.c:2426 kernel_clone+0xfc/0x960 kernel/fork.c:2599 __do_sys_clone3+0x212/0x290 kernel/fork.c:2903 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: 0033:0x7fa1a2fc3189 Code: c0 08 00 48 8d 3d 7c c0 08 00 e8 02 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:00007fff33b76008 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007fa1a2f45590 RCX: 00007fa1a2fc3189 RDX: 00007fa1a2f45590 RSI: 0000000000000058 RDI: 00007fff33b76050 RBP: 00007fa1a3d4b6c0 R08: 00007fa1a3d4b6c0 R09: 00007fff33b76137 R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffa8 R13: 000000000000004d R14: 00007fff33b76050 R15: 00007fff33b76138 ------------[ cut here ]------------ pvqspinlock: lock 0xffff888029071280 has corrupted value 0x0! WARNING: CPU: 1 PID: 10038 at kernel/locking/qspinlock_paravirt.h:504 __pv_queued_spin_unlock_slowpath+0x237/0x330 kernel/locking/qspinlock_paravirt.h:504 Modules linked in: CPU: 1 UID: 0 PID: 10038 Comm: syz.3.1041 Not tainted 6.15.0-syzkaller-12426-ge271ed52b344 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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 00 83 ad 8b e8 5a 09 f9 f5 90 <0f> 0b 90 90 e9 64 ff ff ff 90 0f 0b 48 89 df 4c 89 04 24 e8 b1 f5 RSP: 0018:ffffc900038779c8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff888029071280 RCX: ffffffff817ae368 RDX: ffff888025ea8000 RSI: ffffffff817ae375 RDI: 0000000000000001 RBP: ffff888029071288 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 000000002d2d2d2d R12: ffff888029071290 R13: ffff888029071280 R14: 00000000003d0f00 R15: ffff888028f5a440 FS: 00005555738c3500(0000) GS:ffff8880d685a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4b826e7d60 CR3: 000000010b18e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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+0x6b74/0x76a0 kernel/fork.c:2426 kernel_clone+0xfc/0x960 kernel/fork.c:2599 __do_sys_clone3+0x212/0x290 kernel/fork.c:2903 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: 0033:0x7fa1a2fc3189 Code: c0 08 00 48 8d 3d 7c c0 08 00 e8 02 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:00007fff33b76008 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007fa1a2f45590 RCX: 00007fa1a2fc3189 RDX: 00007fa1a2f45590 RSI: 0000000000000058 RDI: 00007fff33b76050 RBP: 00007fa1a3d4b6c0 R08: 00007fa1a3d4b6c0 R09: 00007fff33b76137 R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffa8 R13: 000000000000004d R14: 00007fff33b76050 R15: 00007fff33b76138