=============================
[ BUG: Invalid wait context ]
syzkaller #0 Not tainted
-----------------------------
syz.0.0/5321 is trying to lock:
ffff888051885bb0 (&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.0.0/5321:
#0: ffff888051886110 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:187 [inline]
#0: ffff888051886110 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:294 [inline]
#0: ffff888051886110 (&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: 5321 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:inode_lock_nested include/linux/fs.h:1069 [inline]
RIP: 0010:__simple_recursive_removal+0x89/0x520 fs/libfs.c:606
Code: c6 d8 00 00 00 4c 89 f7 e8 54 ac 4b ff 49 8d 7c 24 68 48 89 f8 48 c1 e8 03 42 80 3c 38 00 74 05 e8 9c ab df ff 4d 8b 74 24 68 <49> 8d be d8 00 00 00 be 02 00 00 00 e8 96 c1 4b ff 4c 89 e0 48 c1
RSP: 0018:ffffc9000f0b7c58 EFLAGS: 00000246
RAX: 1ffff11002632a70 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff888013195380
RBP: dffffc0000000000 R08: ffff8880131953d3 R09: 1ffff11002632a7a
R10: dffffc0000000000 R11: ffffed1002632a7b R12: ffff888013195318
R13: ffff888013195318 R14: ffff888043a3d810 R15: dffffc0000000000
debugfs_remove+0x5b/0x70 fs/debugfs/inode.c:781
kvm_destroy_vm_debugfs virt/kvm/kvm_main.c:988 [inline]
kvm_destroy_vm virt/kvm/kvm_main.c:1261 [inline]
kvm_put_kvm+0x147/0xb50 virt/kvm/kvm_main.c:1331
kvm_vm_release+0x43/0x50 virt/kvm/kvm_main.c:1354
__fput+0x418/0xa50 fs/file_table.c:512
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
exit_to_user_mode_loop+0x1fa/0x730 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
do_syscall_64+0x353/0x580 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc8cb39e0d9
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:00007fc8cc215fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007fc8cb626090 RCX: 00007fc8cb39e0d9
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: 00007fc8cb435024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc8cb626128 R14: 00007fc8cb626090 R15: 00007ffc966e1c68
----------------
Code disassembly (best guess), 1 bytes skipped:
0: d8 00 fadds (%rax)
2: 00 00 add %al,(%rax)
4: 4c 89 f7 mov %r14,%rdi
7: e8 54 ac 4b ff call 0xff4bac60
c: 49 8d 7c 24 68 lea 0x68(%r12),%rdi
11: 48 89 f8 mov %rdi,%rax
14: 48 c1 e8 03 shr $0x3,%rax
18: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1)
1d: 74 05 je 0x24
1f: e8 9c ab df ff call 0xffdfabc0
24: 4d 8b 74 24 68 mov 0x68(%r12),%r14
* 29: 49 8d be d8 00 00 00 lea 0xd8(%r14),%rdi <-- trapping instruction
30: be 02 00 00 00 mov $0x2,%esi
35: e8 96 c1 4b ff call 0xff4bc1d0
3a: 4c 89 e0 mov %r12,%rax
3d: 48 rex.W
3e: c1 .byte 0xc1