=============================
[ BUG: Invalid wait context ]
syzkaller #0 Not tainted
-----------------------------
syz.0.0/5313 is trying to lock:
ffff888050b5dbb0 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x1f4/0x9a0 arch/x86/kvm/xen.c:1822
other info that might help us debug this:
context-{2:2}
1 lock held by syz.0.0/5313:
#0: ffff888050b5e110 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:187 [inline]
#0: ffff888050b5e110 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:294 [inline]
#0: ffff888050b5e110 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x1bc/0x9a0 arch/x86/kvm/xen.c:1820
stack backtrace:
CPU: 0 UID: 0 PID: 5313 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:4830 [inline]
check_wait_context kernel/locking/lockdep.c:4902 [inline]
__lock_acquire+0xe39/0x2cf0 kernel/locking/lockdep.c:5187
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:174 [inline]
_raw_read_lock_irqsave+0x48/0x60 kernel/locking/spinlock.c:240
kvm_xen_set_evtchn_fast+0x1f4/0x9a0 arch/x86/kvm/xen.c:1822
xen_timer_callback+0x109/0x220 arch/x86/kvm/xen.c:140
__run_hrtimer kernel/time/hrtimer.c:2032 [inline]
__hrtimer_run_queues+0x371/0xa10 kernel/time/hrtimer.c:2096
hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215
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:finish_task_switch+0x417/0xc60 kernel/sched/core.c:5361
Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 53 ec 3f 0a e8 fe b9 39 00 fb 4c 8b 65 c8 <49> 8d bc 24 f8 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc9000de477a0 EFLAGS: 00000202
RAX: 0000000000000b0b RBX: ffff88801fc3bf20 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8e22b7e8 RDI: ffffffff8c4bce80
RBP: ffffc9000de477f0 R08: ffffffff90576c37 R09: 1ffffffff20aed86
R10: dffffc0000000000 R11: fffffbfff20aed87 R12: ffff888039efa540
R13: ffff88801fc3bee8 R14: dffffc0000000000 R15: 1ffff11003f877e4
context_switch kernel/sched/core.c:5513 [inline]
__schedule+0x17e1/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
futex_do_wait kernel/futex/waitwake.c:387 [inline]
__futex_wait+0x1d3/0x400 kernel/futex/waitwake.c:722
futex_wait+0x121/0x390 kernel/futex/waitwake.c:750
do_futex+0x3e7/0x4e0 kernel/futex/syscalls.c:133
__do_sys_futex kernel/futex/syscalls.c:210 [inline]
__se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:191
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f314e79e0d9
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:00007ffff4318f28 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000019ea8 RCX: 00007f314e79e0d9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f314ea2609c
RBP: 0000000000000032 R08: 3fffffffffffffff R09: 0000000000000000
R10: 00007ffff4319030 R11: 0000000000000246 R12: 00007ffff4319050
R13: 00007f314ea2609c R14: 0000000000019eda R15: 00007ffff4319030
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 00 00 add %al,(%rax)
2: 41 c7 84 24 20 0e 00 movl $0x0,0xe20(%r12)
9: 00 00 00 00 00
e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
13: 49 83 c4 48 add $0x48,%r12
17: 4c 89 e7 mov %r12,%rdi
1a: e8 53 ec 3f 0a call 0xa3fec72
1f: e8 fe b9 39 00 call 0x39ba22
24: fb sti
25: 4c 8b 65 c8 mov -0x38(%rbp),%r12
* 29: 49 8d bc 24 f8 16 00 lea 0x16f8(%r12),%rdi <-- trapping instruction
30: 00
31: 48 89 f8 mov %rdi,%rax
34: 48 c1 e8 03 shr $0x3,%rax
38: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax
3d: 84 c0 test %al,%al