=============================
WARNING: suspicious RCU usage
5.7.0-rc7-next-20200526-syzkaller #0 Not tainted
-----------------------------
kernel/rcu/tree.c:715 RCU dynticks_nesting counter underflow/zero!!

other info that might help us debug this:


RCU used illegally from idle CPU!
rcu_scheduler_active = 2, debug_locks = 1
RCU used illegally from extended quiescent state!
no locks held by syz-executor.1/9065.

stack backtrace:
CPU: 0 PID: 9065 Comm: syz-executor.1 Not tainted 5.7.0-rc7-next-20200526-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 rcu_irq_exit_preempt+0x1fa/0x250 kernel/rcu/tree.c:715
 idtentry_exit+0x9e/0xc0 arch/x86/entry/common.c:583
 exc_general_protection+0x23d/0x520 arch/x86/kernel/traps.c:506
 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:353
RIP: 0010:kvm_fastop_exception+0xb68/0xfe8
Code: f2 ff ff ff 48 31 db e9 cb c9 2a f9 b8 f2 ff ff ff 48 31 f6 e9 cf c9 2a f9 31 c0 e9 bc 2c 2b f9 b8 fb ff ff ff e9 13 a9 31 f9 <b9> fb ff ff ff 31 c0 31 d2 e9 33 a9 31 f9 31 db e9 2a 0b 42 f9 31
RSP: 0018:ffffc9001692fa30 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff888056e7c480 RCX: 0000000000000122
RDX: 000000000000618f RSI: ffffc9001692fa98 RDI: 0000000000000122
RBP: 0000000000000122 R08: ffff888093c085c0 R09: fffffbfff131f481
R10: ffffffff898fa403 R11: fffffbfff131f480 R12: 0000000000000122
R13: 0000000000000078 R14: 0000000000000006 R15: ffffffff88244b5c
 paravirt_read_msr_safe arch/x86/include/asm/paravirt.h:178 [inline]
 vmx_create_vcpu+0x184/0x2b40 arch/x86/kvm/vmx/vmx.c:6827
 kvm_arch_vcpu_create+0x6a8/0xb30 arch/x86/kvm/x86.c:9427
 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3041 [inline]
 kvm_vm_ioctl+0x15b7/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3601
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:753
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl fs/ioctl.c:760 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:353
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca29
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6be363dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e73c0 RCX: 000000000045ca29
RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000396 R14: 00000000004c62c6 R15: 00007f6be363e6d4

=============================
WARNING: suspicious RCU usage
5.7.0-rc7-next-20200526-syzkaller #0 Not tainted
-----------------------------
kernel/rcu/tree.c:717 RCU in extended quiescent state!!

other info that might help us debug this:


RCU used illegally from idle CPU!
rcu_scheduler_active = 2, debug_locks = 1
RCU used illegally from extended quiescent state!
no locks held by syz-executor.1/9065.

stack backtrace:
CPU: 0 PID: 9065 Comm: syz-executor.1 Not tainted 5.7.0-rc7-next-20200526-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 idtentry_exit+0x9e/0xc0 arch/x86/entry/common.c:583
 exc_general_protection+0x23d/0x520 arch/x86/kernel/traps.c:506
 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:353
RIP: 0010:kvm_fastop_exception+0xb68/0xfe8
Code: f2 ff ff ff 48 31 db e9 cb c9 2a f9 b8 f2 ff ff ff 48 31 f6 e9 cf c9 2a f9 31 c0 e9 bc 2c 2b f9 b8 fb ff ff ff e9 13 a9 31 f9 <b9> fb ff ff ff 31 c0 31 d2 e9 33 a9 31 f9 31 db e9 2a 0b 42 f9 31
RSP: 0018:ffffc9001692fa30 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff888056e7c480 RCX: 0000000000000122
RDX: 000000000000618f RSI: ffffc9001692fa98 RDI: 0000000000000122
RBP: 0000000000000122 R08: ffff888093c085c0 R09: fffffbfff131f481
R10: ffffffff898fa403 R11: fffffbfff131f480 R12: 0000000000000122
R13: 0000000000000078 R14: 0000000000000006 R15: ffffffff88244b5c
 paravirt_read_msr_safe arch/x86/include/asm/paravirt.h:178 [inline]
 vmx_create_vcpu+0x184/0x2b40 arch/x86/kvm/vmx/vmx.c:6827
 kvm_arch_vcpu_create+0x6a8/0xb30 arch/x86/kvm/x86.c:9427
 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3041 [inline]
 kvm_vm_ioctl+0x15b7/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3601
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:753
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl fs/ioctl.c:760 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:353
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca29
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6be363dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e73c0 RCX: 000000000045ca29
RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000396 R14: 00000000004c62c6 R15: 00007f6be363e6d4

=============================
WARNING: suspicious RCU usage
5.7.0-rc7-next-20200526-syzkaller #0 Not tainted
-----------------------------
include/trace/events/rcu.h:27 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


RCU used illegally from idle CPU!
rcu_scheduler_active = 2, debug_locks = 1
RCU used illegally from extended quiescent state!
no locks held by syz-executor.1/9065.

stack backtrace:
CPU: 0 PID: 9065 Comm: syz-executor.1 Not tainted 5.7.0-rc7-next-20200526-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 trace_rcu_utilization include/trace/events/rcu.h:27 [inline]
 trace_rcu_utilization include/trace/events/rcu.h:27 [inline]
 rcu_note_context_switch+0x113d/0x1b20 kernel/rcu/tree_plugin.h:293
 __schedule+0x22b/0x1fa0 kernel/sched/core.c:4095
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4417
 idtentry_exit+0xb9/0xc0 arch/x86/entry/common.c:585
 exc_general_protection+0x23d/0x520 arch/x86/kernel/traps.c:506
 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:353
RIP: 0010:kvm_fastop_exception+0xb68/0xfe8
Code: f2 ff ff ff 48 31 db e9 cb c9 2a f9 b8 f2 ff ff ff 48 31 f6 e9 cf c9 2a f9 31 c0 e9 bc 2c 2b f9 b8 fb ff ff ff e9 13 a9 31 f9 <b9> fb ff ff ff 31 c0 31 d2 e9 33 a9 31 f9 31 db e9 2a 0b 42 f9 31
RSP: 0018:ffffc9001692fa30 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff888056e7c480 RCX: 0000000000000122
RDX: 000000000000618f RSI: ffffc9001692fa98 RDI: 0000000000000122
RBP: 0000000000000122 R08: ffff888093c085c0 R09: fffffbfff131f481
R10: ffffffff898fa403 R11: fffffbfff131f480 R12: 0000000000000122
R13: 0000000000000078 R14: 0000000000000006 R15: ffffffff88244b5c
 paravirt_read_msr_safe arch/x86/include/asm/paravirt.h:178 [inline]
 vmx_create_vcpu+0x184/0x2b40 arch/x86/kvm/vmx/vmx.c:6827
 kvm_arch_vcpu_create+0x6a8/0xb30 arch/x86/kvm/x86.c:9427
 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3041 [inline]
 kvm_vm_ioctl+0x15b7/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3601
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:753
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl fs/ioctl.c:760 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:353
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca29
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6be363dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e73c0 RCX: 000000000045ca29
RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000396 R14: 00000000004c62c6 R15: 00007f6be363e6d4

=============================
WARNING: suspicious RCU usage
5.7.0-rc7-next-20200526-syzkaller #0 Not tainted
-----------------------------
kernel/sched/sched.h:2344 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


RCU used illegally from idle CPU!
rcu_scheduler_active = 2, debug_locks = 0
RCU used illegally from extended quiescent state!
1 lock held by syz-executor.1/9065:
 #0: ffff8880ae637d58 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1263 [inline]
 #0: ffff8880ae637d58 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x233/0x1fa0 kernel/sched/core.c:4105

stack backtrace:
CPU: 0 PID: 9065 Comm: syz-executor.1 Not tainted 5.7.0-rc7-next-20200526-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 cpufreq_update_util kernel/sched/sched.h:2344 [inline]
 cfs_rq_util_change kernel/sched/fair.c:3284 [inline]
 update_load_avg+0x13de/0x1c60 kernel/sched/fair.c:3804
 put_prev_entity+0xc1/0x2a0 kernel/sched/fair.c:4490
 pick_next_task_fair+0x65f/0xc70 kernel/sched/fair.c:7044
 pick_next_task kernel/sched/core.c:4012 [inline]
 __schedule+0x375/0x1fa0 kernel/sched/core.c:4127
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4417
 idtentry_exit+0xb9/0xc0 arch/x86/entry/common.c:585
 exc_general_protection+0x23d/0x520 arch/x86/kernel/traps.c:506
 asm_exc_general_protection+0x1e/0x30 arch/x86/include/asm/idtentry.h:353
RIP: 0010:kvm_fastop_exception+0xb68/0xfe8
Code: f2 ff ff ff 48 31 db e9 cb c9 2a f9 b8 f2 ff ff ff 48 31 f6 e9 cf c9 2a f9 31 c0 e9 bc 2c 2b f9 b8 fb ff ff ff e9 13 a9 31 f9 <b9> fb ff ff ff 31 c0 31 d2 e9 33 a9 31 f9 31 db e9 2a 0b 42 f9 31
RSP: 0018:ffffc9001692fa30 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff888056e7c480 RCX: 0000000000000122
RDX: 000000000000618f RSI: ffffc9001692fa98 RDI: 0000000000000122
RBP: 0000000000000122 R08: ffff888093c085c0 R09: fffffbfff131f481
R10: ffffffff898fa403 R11: fffffbfff131f480 R12: 0000000000000122
R13: 0000000000000078 R14: 0000000000000006 R15: ffffffff88244b5c
 paravirt_read_msr_safe arch/x86/include/asm/paravirt.h:178 [inline]
 vmx_create_vcpu+0x184/0x2b40 arch/x86/kvm/vmx/vmx.c:6827
 kvm_arch_vcpu_create+0x6a8/0xb30 arch/x86/kvm/x86.c:9427
 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3041 [inline]
 kvm_vm_ioctl+0x15b7/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3601
 vfs_ioctl fs/ioctl.c:48 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:753
 __do_sys_ioctl fs/ioctl.c:762 [inline]
 __se_sys_ioctl fs/ioctl.c:760 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:353
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ca29
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f6be363dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004e73c0 RCX: 000000000045ca29
RDX: 0000000000000000 RSI: 000000000000ae41 RDI: 0000000000000004
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000396 R14: 00000000004c62c6 R15: 00007f6be363e6d4