=============================
[ BUG: Invalid wait context ]
syzkaller #0 Not tainted
-----------------------------
syz.0.0/5319 is trying to lock:
ffff888013189bb0 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x1f4/0x9a0 arch/x86/kvm/xen.c:1843
other info that might help us debug this:
context-{2:2}
locks held by syz.0.0/5319: 3, last CPU#0:
#0: ffff8880359880a8 (&vcpu->mutex){+.+.}-{4:4}, at: kvm_vcpu_ioctl+0x27f/0xfd0 virt/kvm/kvm_main.c:4467
#1: ffff88801318a110 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:198 [inline]
#1: ffff88801318a110 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:305 [inline]
#1: ffff88801318a110 (&kvm->srcu){.?.+}-{0:0}, at: kvm_vcpu_srcu_read_lock include/linux/kvm_host.h:963 [inline]
#1: ffff88801318a110 (&kvm->srcu){.?.+}-{0:0}, at: kvm_arch_vcpu_ioctl_run+0x1f8/0x19c0 arch/x86/kvm/x86.c:8901
#2: ffff88801318a110 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:198 [inline]
#2: ffff88801318a110 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:305 [inline]
#2: ffff88801318a110 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x1bc/0x9a0 arch/x86/kvm/xen.c:1841
stack backtrace:
CPU: 0 UID: 0 PID: 5319 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_lock_invalid_wait_context kernel/locking/lockdep.c:4874 [inline]
check_wait_context kernel/locking/lockdep.c:4946 [inline]
__lock_acquire+0xf5b/0x2de0 kernel/locking/lockdep.c:5238
lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:271
kvm_xen_set_evtchn_fast+0x1f4/0x9a0 arch/x86/kvm/xen.c:1843
xen_timer_callback+0x109/0x220 arch/x86/kvm/xen.c:139
__run_hrtimer kernel/time/hrtimer.c:2074 [inline]
__hrtimer_run_queues+0x371/0xa10 kernel/time/hrtimer.c:2131
hrtimer_interrupt+0x4cd/0xaa0 kernel/time/hrtimer.c:2250
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline]
RIP: 0010:kvm_xen_has_pending_events arch/x86/kvm/xen.h:86 [inline]
RIP: 0010:vcpu_run+0x8f2/0x7aa0 arch/x86/kvm/x86.c:8659
Code: 00 48 89 d0 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 40 4e 00 00 c6 02 00 4c 89 f7 be 08 00 00 00 e8 b3 51 f4 00 f0 41 80 26 fb <0f> 1f 44 00 00 e8 d4 cf 81 00 4c 89 e7 e8 dc 50 06 00 89 c3 31 ff
RSP: 0018:ffffc9000f10f800 EFLAGS: 00000202
RAX: ffffffff81469801 RBX: 0000000000000001 RCX: ffffffff8146506d
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff888035988038
RBP: ffffc9000f10fbd0 R08: ffff88803598803f R09: 1ffff11006b31007
R10: dffffc0000000000 R11: ffffed1006b31008 R12: ffff888035988000
R13: ffff8880359880d0 R14: ffff888035988038 R15: dffffc0000000000
kvm_arch_vcpu_ioctl_run+0xe87/0x19c0 arch/x86/kvm/x86.c:8990
kvm_vcpu_ioctl+0xa61/0xfd0 virt/kvm/kvm_main.c:4499
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdbdfb9e1d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fdbe0aaffe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdbdfe25fa0 RCX: 00007fdbdfb9e1d9
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000009
RBP: 00007fdbdfc35888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdbdfe26038 R14: 00007fdbdfe25fa0 R15: 00007ffff290d058
----------------
Code disassembly (best guess):
0: 00 48 89 add %cl,-0x77(%rax)
3: d0 48 c1 rorb $1,-0x3f(%rax)
6: e8 03 42 0f b6 call 0xb60f420e
b: 04 38 add $0x38,%al
d: 84 c0 test %al,%al
f: 0f 85 40 4e 00 00 jne 0x4e55
15: c6 02 00 movb $0x0,(%rdx)
18: 4c 89 f7 mov %r14,%rdi
1b: be 08 00 00 00 mov $0x8,%esi
20: e8 b3 51 f4 00 call 0xf451d8
25: f0 41 80 26 fb lock andb $0xfb,(%r14)
* 2a: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction
2f: e8 d4 cf 81 00 call 0x81d008
34: 4c 89 e7 mov %r12,%rdi
37: e8 dc 50 06 00 call 0x65118
3c: 89 c3 mov %eax,%ebx
3e: 31 ff xor %edi,%edi