=============================
[ BUG: Invalid wait context ]
syzkaller #0 Not tainted
-----------------------------
swapper/3/0 is trying to lock:
ffff888057f65bc8 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x255/0xd70 arch/x86/kvm/xen.c:1872
other info that might help us debug this:
context-{2:2}
locks held by swapper/3/0: 1, on CPU#3:
#0: ffff888057f66118 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:249 [inline]
#0: ffff888057f66118 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:356 [inline]
#0: ffff888057f66118 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x23b/0xd70 arch/x86/kvm/xen.c:1870
stack backtrace:
CPU: 3 UID: 0 PID: 0 Comm: swapper/3 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 lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 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+0xfcc/0x1f40 kernel/locking/lockdep.c:5238
lock_acquire kernel/locking/lockdep.c:5942 [inline]
lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
_raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:271
kvm_xen_set_evtchn_fast+0x255/0xd70 arch/x86/kvm/xen.c:1872
xen_timer_callback+0x1db/0x2a0 arch/x86/kvm/xen.c:139
__run_hrtimer kernel/time/hrtimer.c:2079 [inline]
__hrtimer_run_queues+0x135/0x9a0 kernel/time/hrtimer.c:2136
hrtimer_interrupt+0x441/0xaa0 kernel/time/hrtimer.c:2255
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
__sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 46 a0 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 33 5e 1c 00 fb f4 4c 62 03 00 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 00000206
RAX: 000000000003b9a5 RBX: ffff888020ab0000 RCX: ffffffff8bef6375
RDX: 0000000000000001 RSI: ffffffff8e628f58 RDI: ffffffff8c835280
RBP: ffffed1004156000 R08: 0000000000000001 R09: ffffed100d466825
R10: ffff88806a33412b R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff92000034fc4 R15: dffffc0000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline]
default_idle+0x9/0x10 arch/x86/kernel/process.c:768
default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x3ae/0x5b0 kernel/sched/idle.c:355
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:458
start_secondary+0x21d/0x2d0 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x158
----------------
Code disassembly (best guess):
0: 46 a0 02 c3 cc cc cc rex.RX movabs 0x1f0fccccccccc302,%al
7: cc 0f 1f
a: 00 90 90 90 90 90 add %dl,-0x6f6f6f70(%rax)
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: f3 0f 1e fa endbr64
1f: eb 07 jmp 0x28
21: 0f 00 2d 33 5e 1c 00 verw 0x1c5e33(%rip) # 0x1c5e5b
28: fb sti
29: f4 hlt
* 2a: e9 4c 62 03 00 jmp 0x3627b <-- trapping instruction
2f: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1)
36: 00 00 00
39: 66 90 xchg %ax,%ax
3b: 90 nop
3c: 90 nop
3d: 90 nop
3e: 90 nop
3f: 90 nop