===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- syz.1.1684/11269 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.1.1684/11269: #0: ffffffff8e61ba10 (cgroup_threadgroup_rwsem){++++}-{0:0} , at: copy_process+0x4ba7/0x7690 kernel/fork.c:2274 stack backtrace: CPU: 0 UID: 0 PID: 11269 Comm: syz.1.1684 Not tainted syzkaller #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: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: 0033:0x7f9fd9fc3449 Code: d7 08 00 48 8d 3d fc d7 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:00007fff60a9c2c8 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f9fd9f45860 RCX: 00007f9fd9fc3449 RDX: 00007f9fd9f45860 RSI: 0000000000000058 RDI: 00007fff60a9c310 RBP: 00007f9fdad176c0 R08: 00007f9fdad176c0 R09: 00007fff60a9c3f7 R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffa8 R13: 000000000000000b R14: 00007fff60a9c310 R15: 00007fff60a9c3f8 ------------[ cut here ]------------ pvqspinlock: lock 0xffff8880291fe5c0 has corrupted value 0x0! WARNING: CPU: 0 PID: 11269 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: 11269 Comm: syz.1.1684 Not tainted syzkaller #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 c0 82 ad 8b e8 4a ab e3 f5 90 <0f> 0b 90 90 e9 64 ff ff ff 90 0f 0b 48 89 df 4c 89 04 24 e8 11 61 RSP: 0018:ffffc90005b5f9c8 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8880291fe5c0 RCX: ffffffff817a3358 RDX: ffff8880475d2440 RSI: ffffffff817a3365 RDI: 0000000000000001 RBP: ffff8880291fe5c8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 5f65677261686320 R12: ffff8880291fe5d0 R13: ffff8880291fe5c0 R14: 00000000003d0f00 R15: ffff888027e7a440 FS: 0000555555c51500(0000) GS:ffff8880d66b9000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556d3fe5c8 CR3: 000000003a205000 CR4: 0000000000352ef0 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/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9fd9fc3449 Code: d7 08 00 48 8d 3d fc d7 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:00007fff60a9c2c8 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f9fd9f45860 RCX: 00007f9fd9fc3449 RDX: 00007f9fd9f45860 RSI: 0000000000000058 RDI: 00007fff60a9c310 RBP: 00007f9fdad176c0 R08: 00007f9fdad176c0 R09: 00007fff60a9c3f7 R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffa8 R13: 000000000000000b R14: 00007fff60a9c310 R15: 00007fff60a9c3f8