=============================
[ BUG: Invalid wait context ]
6.15.0-syzkaller-08486-gf66bc387efbe #0 Not tainted
-----------------------------
syz.2.730/8501 is trying to lock:
ffffc9000661c410 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x254/0xeb0 arch/x86/kvm/xen.c:1819
other info that might help us debug this:
context-{2:2}
2 locks held by syz.2.730/8501:
#0: ffff888053105330 (&vcpu->mutex){+.+.}-{4:4}, at: kvm_vcpu_ioctl+0x27e/0x1680 virt/kvm/kvm_main.c:4359
#1: ffffc9000661c960 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#1: ffffc9000661c960 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#1: ffffc9000661c960 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x23a/0xeb0 arch/x86/kvm/xen.c:1817
stack backtrace:
CPU: 2 UID: 0 PID: 8501 Comm: syz.2.730 Not tainted 6.15.0-syzkaller-08486-gf66bc387efbe #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_lock_invalid_wait_context kernel/locking/lockdep.c:4833 [inline]
check_wait_context kernel/locking/lockdep.c:4905 [inline]
__lock_acquire+0xa12/0x1c90 kernel/locking/lockdep.c:5190
lock_acquire kernel/locking/lockdep.c:5871 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:236
kvm_xen_set_evtchn_fast+0x254/0xeb0 arch/x86/kvm/xen.c:1819
xen_timer_callback+0x1db/0x2a0 arch/x86/kvm/xen.c:140
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x5ed/0xad0 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x108/0x3f0 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:vcpu_enter_guest arch/x86/kvm/x86.c:11108 [inline]
RIP: 0010:vcpu_run+0x2e85/0x54b0 arch/x86/kvm/x86.c:11308
Code: b6 04 02 48 89 da 83 e2 07 38 d0 7f 08 84 c0 0f 85 66 21 00 00 41 c6 86 1a 0c 00 00 01 e8 c3 bf 82 00 fb 48 8b 95 c0 fe ff ff <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 28 21
RSP: 0018:ffffc90007247ab0 EFLAGS: 00000206
RAX: 0000000000001eeb RBX: ffff888053105e9a RCX: 0000000000000006
RDX: ffff888053106f60 RSI: ffffffff8dc06ed3 RDI: ffffffff8bf52fc0
RBP: ffffc90007247c20 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90877557 R11: 0000000000000000 R12: dffffc0000000000
R13: 0001000000000000 R14: ffff888053105280 R15: ffff8880531052b8
kvm_arch_vcpu_ioctl_run+0x51e/0x18c0 arch/x86/kvm/x86.c:11631
kvm_vcpu_ioctl+0x5e9/0x1680 virt/kvm/kvm_main.c:4391
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl fs/ioctl.c:893 [inline]
__x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd0f718e969
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd0f7f3c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fd0f73b5fa0 RCX: 00007fd0f718e969
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 00007fd0f7210ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd0f73b5fa0 R15: 00007fff429844d8
----------------
Code disassembly (best guess):
0: b6 04 mov $0x4,%dh
2: 02 48 89 add -0x77(%rax),%cl
5: da 83 e2 07 38 d0 fiaddl -0x2fc7f81e(%rbx)
b: 7f 08 jg 0x15
d: 84 c0 test %al,%al
f: 0f 85 66 21 00 00 jne 0x217b
15: 41 c6 86 1a 0c 00 00 movb $0x1,0xc1a(%r14)
1c: 01
1d: e8 c3 bf 82 00 call 0x82bfe5
22: fb sti
23: 48 8b 95 c0 fe ff ff mov -0x140(%rbp),%rdx
* 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction
31: fc ff df
34: 48 c1 ea 03 shr $0x3,%rdx
38: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
3c: 0f .byte 0xf
3d: 85 28 test %ebp,(%rax)
3f: 21 .byte 0x21