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Date:   Mon, 25 May 2020 20:54:14 -0700
From:   syzbot <syzbot+3ae5eaae0809ee311e75@...kaller.appspotmail.com>
To:     bp@...en8.de, hpa@...or.com, linux-kernel@...r.kernel.org,
        luto@...nel.org, mingo@...hat.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, x86@...nel.org
Subject: WARNING: suspicious RCU usage in idtentry_exit

Hello,

syzbot found the following crash on:

HEAD commit:    7b4cb0a4 Add linux-next specific files for 20200525
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=13356016100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=47b0740d89299c10
dashboard link: https://syzkaller.appspot.com/bug?extid=3ae5eaae0809ee311e75
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3ae5eaae0809ee311e75@...kaller.appspotmail.com

=============================
WARNING: suspicious RCU usage
5.7.0-rc7-next-20200525-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.5/24641.

stack backtrace:
CPU: 1 PID: 24641 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200525-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 fb c9 2a f9 b8 f2 ff ff ff 48 31 f6 e9 ff c9 2a f9 31 c0 e9 ec 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:ffffc90004a87a30 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff88809cca4080 RCX: 0000000000000122
RDX: 00000000000063ff RSI: ffffc90004a87a98 RDI: 0000000000000122
RBP: 0000000000000122 R08: ffff888058486480 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:3043 [inline]
 kvm_vm_ioctl+0x15b7/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3603
 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:00007f2c93b11c78 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: 00007f2c93b126d4

=============================
WARNING: suspicious RCU usage
5.7.0-rc7-next-20200525-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.5/24641.

stack backtrace:
CPU: 1 PID: 24641 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200525-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 fb c9 2a f9 b8 f2 ff ff ff 48 31 f6 e9 ff c9 2a f9 31 c0 e9 ec 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:ffffc90004a87a30 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff88809cca4080 RCX: 0000000000000122
RDX: 00000000000063ff RSI: ffffc90004a87a98 RDI: 0000000000000122
RBP: 0000000000000122 R08: ffff888058486480 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:3043 [inline]
 kvm_vm_ioctl+0x15b7/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3603
 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:00007f2c93b11c78 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: 00007f2c93b126d4

=============================
WARNING: suspicious RCU usage
5.7.0-rc7-next-20200525-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.5/24641.

stack backtrace:
CPU: 1 PID: 24641 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200525-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/0x1f70 kernel/sched/core.c:4058
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4380
 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 fb c9 2a f9 b8 f2 ff ff ff 48 31 f6 e9 ff c9 2a f9 31 c0 e9 ec 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:ffffc90004a87a30 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff88809cca4080 RCX: 0000000000000122
RDX: 00000000000063ff RSI: ffffc90004a87a98 RDI: 0000000000000122
RBP: 0000000000000122 R08: ffff888058486480 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:3043 [inline]
 kvm_vm_ioctl+0x15b7/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3603
 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:00007f2c93b11c78 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: 00007f2c93b126d4

=============================
WARNING: suspicious RCU usage
5.7.0-rc7-next-20200525-syzkaller #0 Not tainted
-----------------------------
include/trace/events/sched.h:629 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.5/24641:
 #0: ffff8880ae737d58 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1263 [inline]
 #0: ffff8880ae737d58 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x233/0x1f70 kernel/sched/core.c:4068

stack backtrace:
CPU: 1 PID: 24641 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200525-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_pelt_se_tp include/trace/events/sched.h:629 [inline]
 trace_pelt_se_tp include/trace/events/sched.h:629 [inline]
 __update_load_avg_se+0x75a/0xc90 kernel/sched/pelt.c:321
 update_load_avg+0x178/0x1c60 kernel/sched/fair.c:3786
 set_next_entity+0x295/0x880 kernel/sched/fair.c:4387
 pick_next_task_fair+0x66f/0xc70 kernel/sched/fair.c:7045
 pick_next_task kernel/sched/core.c:3975 [inline]
 __schedule+0x375/0x1f70 kernel/sched/core.c:4090
 preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:4380
 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 fb c9 2a f9 b8 f2 ff ff ff 48 31 f6 e9 ff c9 2a f9 31 c0 e9 ec 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:ffffc90004a87a30 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff88809cca4080 RCX: 0000000000000122
RDX: 00000000000063ff RSI: ffffc90004a87a98 RDI: 0000000000000122
RBP: 0000000000000122 R08: ffff888058486480 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:3043 [inline]
 kvm_vm_ioctl+0x15b7/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3603
 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:00007f2c93b11c78 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: 00007f2c93b126d4
check_preemption_disabled: 3 callbacks suppressed
BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.5/24641
caller is rcu_nmi_enter+0x19/0x200 kernel/rcu/tree.c:823
CPU: 1 PID: 24641 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200525-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
 check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
 rcu_nmi_enter+0x19/0x200 kernel/rcu/tree.c:823
 kernel_text_address+0x99/0xe0 kernel/extable.c:143
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:317 [inline]
 unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:312
 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:494 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484
 __d_alloc+0x2a/0x920 fs/dcache.c:1709
 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1838
 alloc_file_pseudo+0xc6/0x250 fs/file_table.c:226
 anon_inode_getfile fs/anon_inodes.c:91 [inline]
 anon_inode_getfile+0xc8/0x1f0 fs/anon_inodes.c:74
 anon_inode_getfd+0x4c/0xa0 fs/anon_inodes.c:136
 create_vcpu_fd arch/x86/kvm/../../../virt/kvm/kvm_main.c:2983 [inline]
 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3058 [inline]
 kvm_vm_ioctl+0x1ab5/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3603
 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:00007f2c93b11c78 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: 00007f2c93b126d4
BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.5/24641
caller is rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:299 [inline]
caller is rcu_nmi_enter+0x7b/0x200 kernel/rcu/tree.c:838
CPU: 1 PID: 24641 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200525-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
 check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
 rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:299 [inline]
 rcu_nmi_enter+0x7b/0x200 kernel/rcu/tree.c:838
 kernel_text_address+0x99/0xe0 kernel/extable.c:143
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:317 [inline]
 unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:312
 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:494 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484
 __d_alloc+0x2a/0x920 fs/dcache.c:1709
 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1838
 alloc_file_pseudo+0xc6/0x250 fs/file_table.c:226
 anon_inode_getfile fs/anon_inodes.c:91 [inline]
 anon_inode_getfile+0xc8/0x1f0 fs/anon_inodes.c:74
 anon_inode_getfd+0x4c/0xa0 fs/anon_inodes.c:136
 create_vcpu_fd arch/x86/kvm/../../../virt/kvm/kvm_main.c:2983 [inline]
 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3058 [inline]
 kvm_vm_ioctl+0x1ab5/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3603
 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:00007f2c93b11c78 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: 00007f2c93b126d4
BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.5/24641
caller is rcu_dynticks_eqs_enter+0x11/0x70 kernel/rcu/tree.c:236
CPU: 1 PID: 24641 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200525-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
 check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
 rcu_dynticks_eqs_enter+0x11/0x70 kernel/rcu/tree.c:236
 rcu_nmi_enter+0x185/0x200 kernel/rcu/tree.c:844
 kernel_text_address+0x99/0xe0 kernel/extable.c:143
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:317 [inline]
 unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:312
 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:494 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484
 __d_alloc+0x2a/0x920 fs/dcache.c:1709
 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1838
 alloc_file_pseudo+0xc6/0x250 fs/file_table.c:226
 anon_inode_getfile fs/anon_inodes.c:91 [inline]
 anon_inode_getfile+0xc8/0x1f0 fs/anon_inodes.c:74
 anon_inode_getfd+0x4c/0xa0 fs/anon_inodes.c:136
 create_vcpu_fd arch/x86/kvm/../../../virt/kvm/kvm_main.c:2983 [inline]
 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3058 [inline]
 kvm_vm_ioctl+0x1ab5/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3603
 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:00007f2c93b11c78 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: 00007f2c93b126d4
BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.5/24641
caller is rcu_nmi_exit+0x19/0x2c0 kernel/rcu/tree.c:634
CPU: 1 PID: 24641 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200525-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
 check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
 rcu_nmi_exit+0x19/0x2c0 kernel/rcu/tree.c:634
 kernel_text_address+0xb3/0xe0 kernel/extable.c:156
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:317 [inline]
 unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:312
 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:494 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484
 __d_alloc+0x2a/0x920 fs/dcache.c:1709
 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1838
 alloc_file_pseudo+0xc6/0x250 fs/file_table.c:226
 anon_inode_getfile fs/anon_inodes.c:91 [inline]
 anon_inode_getfile+0xc8/0x1f0 fs/anon_inodes.c:74
 anon_inode_getfd+0x4c/0xa0 fs/anon_inodes.c:136
 create_vcpu_fd arch/x86/kvm/../../../virt/kvm/kvm_main.c:2983 [inline]
 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3058 [inline]
 kvm_vm_ioctl+0x1ab5/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3603
 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:00007f2c93b11c78 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: 00007f2c93b126d4
BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.5/24641
caller is rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:299 [inline]
caller is rcu_nmi_exit+0x7b/0x2c0 kernel/rcu/tree.c:642
CPU: 1 PID: 24641 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200525-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
 check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
 rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:299 [inline]
 rcu_nmi_exit+0x7b/0x2c0 kernel/rcu/tree.c:642
 kernel_text_address+0xb3/0xe0 kernel/extable.c:156
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:317 [inline]
 unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:312
 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:494 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484
 __d_alloc+0x2a/0x920 fs/dcache.c:1709
 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1838
 alloc_file_pseudo+0xc6/0x250 fs/file_table.c:226
 anon_inode_getfile fs/anon_inodes.c:91 [inline]
 anon_inode_getfile+0xc8/0x1f0 fs/anon_inodes.c:74
 anon_inode_getfd+0x4c/0xa0 fs/anon_inodes.c:136
 create_vcpu_fd arch/x86/kvm/../../../virt/kvm/kvm_main.c:2983 [inline]
 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3058 [inline]
 kvm_vm_ioctl+0x1ab5/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3603
 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:00007f2c93b11c78 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: 00007f2c93b126d4
BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.5/24641
caller is rcu_dynticks_eqs_enter+0x11/0x70 kernel/rcu/tree.c:236
CPU: 1 PID: 24641 Comm: syz-executor.5 Not tainted 5.7.0-rc7-next-20200525-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
 check_preemption_disabled+0x20d/0x220 lib/smp_processor_id.c:48
 rcu_dynticks_eqs_enter+0x11/0x70 kernel/rcu/tree.c:236
 rcu_nmi_exit+0x214/0x2c0 kernel/rcu/tree.c:670
 kernel_text_address+0xb3/0xe0 kernel/extable.c:156
 __kernel_text_address+0x9/0x30 kernel/extable.c:105
 unwind_get_return_address arch/x86/kernel/unwind_orc.c:317 [inline]
 unwind_get_return_address+0x5a/0xa0 arch/x86/kernel/unwind_orc.c:312
 arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
 save_stack+0x1b/0x40 mm/kasan/common.c:48
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc mm/kasan/common.c:494 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467
 slab_post_alloc_hook mm/slab.h:586 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484
 __d_alloc+0x2a/0x920 fs/dcache.c:1709
 d_alloc_pseudo+0x19/0x70 fs/dcache.c:1838
 alloc_file_pseudo+0xc6/0x250 fs/file_table.c:226
 anon_inode_getfile fs/anon_inodes.c:91 [inline]
 anon_inode_getfile+0xc8/0x1f0 fs/anon_inodes.c:74
 anon_inode_getfd+0x4c/0xa0 fs/anon_inodes.c:136
 create_vcpu_fd arch/x86/kvm/../../../virt/kvm/kvm_main.c:2983 [inline]
 kvm_vm_ioctl_create_vcpu arch/x86/kvm/../../../virt/kvm/kvm_main.c:3058 [inline]
 kvm_vm_ioctl+0x1ab5/0x2460 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3603
 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:00007f2c93b11c78 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: 00007f2c93b126d4


---
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