=============================
[ BUG: Invalid wait context ]
6.15.0-syzkaller-09113-g8477ab143069 #0 Not tainted
-----------------------------
syz.7.1172/10528 is trying to lock:
ffffc90003e54410 (&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}
4 locks held by syz.7.1172/10528:
#0: ffff888029c7be68 (&sb->s_type->i_mutex_key#3){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888029c7be68 (&sb->s_type->i_mutex_key#3){++++}-{4:4}, at: simple_recursive_removal+0x2c5/0x690 fs/libfs.c:628
#1: ffff888027a5b3e8 (&lockref->lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
#1: ffff888027a5b3e8 (&lockref->lock){+.+.}-{3:3}, at: __dentry_kill+0x299/0x600 fs/dcache.c:680
#2: ffffffff8e5c4780 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#2: ffffffff8e5c4780 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#2: ffffffff8e5c4780 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
#2: ffffffff8e5c4780 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x20a0 arch/x86/kernel/unwind_orc.c:479
#3: ffffc90003e54960 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#3: ffffc90003e54960 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#3: ffffc90003e54960 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x23a/0xeb0 arch/x86/kvm/xen.c:1817
stack backtrace:
CPU: 3 UID: 0 PID: 10528 Comm: syz.7.1172 Not tainted 6.15.0-syzkaller-09113-g8477ab143069 #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:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5875
Code: a8 32 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 92 0e 0f 0f 0f 82 74 02 00 00 8b 35 7a 40 0f 0f 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 29 a8 32 12 0f 85 c7 02 00 00 48 83 c4
RSP: 0018:ffffc9000369f420 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e5c4780 RCX: 0000000017e7084d
RDX: 0000000000000000 RSI: ffffffff8dde18e4 RDI: ffffffff8c1530c0
RBP: 0000000000000002 R08: 40c0093756af2415 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xa7/0xc0 mm/kasan/generic.c:548
__call_rcu_common.constprop.0+0x9a/0x9f0 kernel/rcu/tree.c:3090
dentry_free+0xc2/0x160 fs/dcache.c:442
__dentry_kill+0x498/0x600 fs/dcache.c:688
dput.part.0+0x4b1/0x9b0 fs/dcache.c:911
dput+0x1f/0x30 fs/dcache.c:901
find_next_child+0x18f/0x280 fs/libfs.c:603
simple_recursive_removal+0x253/0x690 fs/libfs.c:619
debugfs_remove+0x5d/0x80 fs/debugfs/inode.c:805
kvm_destroy_vm_debugfs+0xc6/0x250 virt/kvm/kvm_main.c:1007
kvm_destroy_vm virt/kvm/kvm_main.c:1271 [inline]
kvm_put_kvm+0xff/0xb40 virt/kvm/kvm_main.c:1344
kvm_vm_release+0x3c/0x50 virt/kvm/kvm_main.c:1367
__fput+0x402/0xb70 fs/file_table.c:465
task_work_run+0x150/0x240 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xae2/0x2c70 kernel/exit.c:959
do_group_exit+0xd3/0x2a0 kernel/exit.c:1108
get_signal+0x2673/0x26d0 kernel/signal.c:3034
arch_do_signal_or_restart+0x8f/0x7d0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x84/0x110 kernel/entry/common.c:111
exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline]
ret_from_fork+0x613/0x6f0 arch/x86/kernel/process.c:157
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
----------------
Code disassembly (best guess):
0: a8 32 test $0x32,%al
2: 12 83 f8 07 0f 87 adc -0x78f0f808(%rbx),%al
8: bc 02 00 00 89 mov $0x89000002,%esp
d: c0 48 0f a3 rorb $0xa3,0xf(%rax)
11: 05 92 0e 0f 0f add $0xf0f0e92,%eax
16: 0f 82 74 02 00 00 jb 0x290
1c: 8b 35 7a 40 0f 0f mov 0xf0f407a(%rip),%esi # 0xf0f409c
22: 85 f6 test %esi,%esi
24: 0f 85 8d 00 00 00 jne 0xb7
* 2a: 48 8b 44 24 30 mov 0x30(%rsp),%rax <-- trapping instruction
2f: 65 48 2b 05 29 a8 32 sub %gs:0x1232a829(%rip),%rax # 0x1232a860
36: 12
37: 0f 85 c7 02 00 00 jne 0x304
3d: 48 rex.W
3e: 83 .byte 0x83
3f: c4 .byte 0xc4