=============================
[ BUG: Invalid wait context ]
6.14.0-rc4-syzkaller #0 Not tainted
-----------------------------
syz.0.2456/16088 is trying to lock:
ffffc9000bf9e458 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x258/0xe80 arch/x86/kvm/xen.c:1755
other info that might help us debug this:
context-{2:2}
4 locks held by syz.0.2456/16088:
#0: ffff888079aee5e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:152 [inline]
#0: ffff888079aee5e0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x160/0x3a0 mm/util.c:573
#1: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#1: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: ___pte_offset_map+0x42/0x540 mm/pgtable-generic.c:287
#2: ffff8880587aca98 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
#2: ffff8880587aca98 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: __pte_offset_map_lock+0xf1/0x300 mm/pgtable-generic.c:402
#3: ffffc9000bf9e968 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:164 [inline]
#3: ffffc9000bf9e968 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:256 [inline]
#3: ffffc9000bf9e968 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x23e/0xe80 arch/x86/kvm/xen.c:1753
stack backtrace:
CPU: 1 UID: 0 PID: 16088 Comm: syz.0.2456 Not tainted 6.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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:4828 [inline]
check_wait_context kernel/locking/lockdep.c:4900 [inline]
__lock_acquire+0x878/0x3c40 kernel/locking/lockdep.c:5178
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851
__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+0x258/0xe80 arch/x86/kvm/xen.c:1755
xen_timer_callback+0x1dd/0x2a0 arch/x86/kvm/xen.c:140
__run_hrtimer kernel/time/hrtimer.c:1801 [inline]
__hrtimer_run_queues+0x5fb/0xae0 kernel/time/hrtimer.c:1865
hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1927
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
__sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:percpu_counter_add_batch+0x3a/0x1e0 lib/percpu_counter.c:98
Code: 89 fc 55 4d 8d 74 24 58 48 63 ea 53 48 83 ec 10 e8 3b b7 c7 fc 4c 89 f2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 <0f> 85 5b 01 00 00 49 8b 44 24 58 65 8b 18 48 63 db 48 89 1c 24 e8
RSP: 0018:ffffc90003127700 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffffea0001a5a3c0 RCX: ffff888079aee400
RDX: 1ffff1100f35dd2a RSI: ffffffff84f228b5 RDI: ffff888079aee8f8
RBP: 0000000000000020 R08: ffff888079aee8f8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000002 R12: ffff888079aee8f8
R13: 0000000000000001 R14: ffff888079aee950 R15: 1ffff92000624eed
percpu_counter_add include/linux/percpu_counter.h:71 [inline]
percpu_counter_inc include/linux/percpu_counter.h:267 [inline]
inc_mm_counter include/linux/mm.h:2620 [inline]
insert_page_into_pte_locked.isra.0+0x338/0x6f0 mm/memory.c:2152
insert_page mm/memory.c:2173 [inline]
vm_insert_page+0x450/0x6d0 mm/memory.c:2323
kcov_mmap+0xd7/0x150 kernel/kcov.c:506
call_mmap include/linux/fs.h:2245 [inline]
mmap_file mm/internal.h:124 [inline]
__mmap_new_file_vma mm/vma.c:2292 [inline]
__mmap_new_vma mm/vma.c:2356 [inline]
__mmap_region+0x181f/0x2760 mm/vma.c:2457
mmap_region+0x32b/0x3f0 mm/vma.c:2535
do_mmap+0xd8d/0x11b0 mm/mmap.c:561
vm_mmap_pgoff+0x203/0x3a0 mm/util.c:575
ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:607
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ef3f8d1a3
Code: f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 41 89 ca 41 f7 c1 ff 0f 00 00 75 14 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 25 c3 0f 1f 40 00 48 c7 c0 a8 ff ff ff 64 c7
RSP: 002b:00007ffc98bd3a98 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f9ef41a62d8 RCX: 00007f9ef3f8d1a3
RDX: 0000000000000003 RSI: 0000000000400000 RDI: 00007f9ef190c000
RBP: 00007f9ef41a6240 R08: 00000000000000db R09: 0000000000000000
R10: 0000000000000011 R11: 0000000000000246 R12: 00007f9ef41a5fa0
R13: 00007f9ef41a6240 R14: 00000000000011e8 R15: 0000000000000004
----------------
Code disassembly (best guess):
0: 89 fc mov %edi,%esp
2: 55 push %rbp
3: 4d 8d 74 24 58 lea 0x58(%r12),%r14
8: 48 63 ea movslq %edx,%rbp
b: 53 push %rbx
c: 48 83 ec 10 sub $0x10,%rsp
10: e8 3b b7 c7 fc call 0xfcc7b750
15: 4c 89 f2 mov %r14,%rdx
18: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1f: fc ff df
22: 48 c1 ea 03 shr $0x3,%rdx
26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
* 2a: 0f 85 5b 01 00 00 jne 0x18b <-- trapping instruction
30: 49 8b 44 24 58 mov 0x58(%r12),%rax
35: 65 8b 18 mov %gs:(%rax),%ebx
38: 48 63 db movslq %ebx,%rbx
3b: 48 89 1c 24 mov %rbx,(%rsp)
3f: e8 .byte 0xe8