=============================
[ BUG: Invalid wait context ]
syzkaller #0 Not tainted
-----------------------------
syz.1.38/6186 is trying to lock:
ffff8880115dd430 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x1fb/0x9b0 arch/x86/kvm/xen.c:1820
other info that might help us debug this:
context-{2:2}
2 locks held by syz.1.38/6186:
#0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1169 [inline]
#0: ffffffff8e33c820 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa5/0x2390 arch/x86/kernel/unwind_orc.c:479
#1: ffff8880115dd980 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#1: ffff8880115dd980 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#1: ffff8880115dd980 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x1c3/0x9b0 arch/x86/kvm/xen.c:1818
stack backtrace:
CPU: 0 UID: 0 PID: 6186 Comm: syz.1.38 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x189/0x250 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+0xbcb/0xd20 kernel/locking/lockdep.c:5187
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
_raw_read_lock_irqsave+0xaf/0x100 kernel/locking/spinlock.c:236
kvm_xen_set_evtchn_fast+0x1fb/0x9b0 arch/x86/kvm/xen.c:1820
xen_timer_callback+0x109/0x220 arch/x86/kvm/xen.c:140
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x4e0/0xc60 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
__sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:memset_orig+0x75/0xb0 arch/x86/lib/memset_64.S:92
Code: 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00 00 00 00 00 89 d1 83 e1 38 74 14 c1 e9 03 66 0f 1f 44 00 00 ff c9 48 89 07 <48> 8d 7f 08 75 f5 83 e2 07 74 0a ff ca 88 07 48 8d 7f 01 75 f6 4c
RSP: 0018:ffffc9000b9977d0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc9000b9978e0 RCX: 0000000000000001
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc9000b9978f8
RBP: dffffc0000000000 R08: ffffc9000b997907 R09: 0000000000000000
R10: ffffc9000b9978f8 R11: fffff52001732f21 R12: ffffc9000b997c58
R13: ffffc9000b9978f8 R14: ffffc9000b9978a8 R15: ffffc9000b9978f0
unwind_next_frame+0xc98/0x2390 arch/x86/kernel/unwind_orc.c:592
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:56 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:5426 [inline]
__kmalloc_noprof+0x411/0x7f0 mm/slub.c:5438
kmalloc_noprof include/linux/slab.h:960 [inline]
sk_prot_alloc+0xe7/0x220 net/core/sock.c:2239
sk_alloc+0x3a/0x370 net/core/sock.c:2295
__netlink_create+0x65/0x260 net/netlink/af_netlink.c:628
netlink_create+0x3ca/0x590 net/netlink/af_netlink.c:686
__sock_create+0x4b3/0x9f0 net/socket.c:1592
sock_create net/socket.c:1650 [inline]
__sys_socket_create net/socket.c:1687 [inline]
__sys_socket+0xd7/0x1b0 net/socket.c:1734
__do_sys_socket net/socket.c:1748 [inline]
__se_sys_socket net/socket.c:1746 [inline]
__x64_sys_socket+0x7a/0x90 net/socket.c:1746
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3e4858eba9
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:00007f3e467f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029
RAX: ffffffffffffffda RBX: 00007f3e487d6090 RCX: 00007f3e4858eba9
RDX: 0000000000000010 RSI: 0000000000000003 RDI: 0000000000000010
RBP: 00007f3e48611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3e487d6128 R14: 00007f3e487d6090 R15: 00007ffc201cef48
----------------
Code disassembly (best guess):
0: 89 47 30 mov %eax,0x30(%rdi)
3: 48 89 47 38 mov %rax,0x38(%rdi)
7: 48 8d 7f 40 lea 0x40(%rdi),%rdi
b: 75 d8 jne 0xffffffe5
d: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1)
14: 00
15: 89 d1 mov %edx,%ecx
17: 83 e1 38 and $0x38,%ecx
1a: 74 14 je 0x30
1c: c1 e9 03 shr $0x3,%ecx
1f: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
25: ff c9 dec %ecx
27: 48 89 07 mov %rax,(%rdi)
* 2a: 48 8d 7f 08 lea 0x8(%rdi),%rdi <-- trapping instruction
2e: 75 f5 jne 0x25
30: 83 e2 07 and $0x7,%edx
33: 74 0a je 0x3f
35: ff ca dec %edx
37: 88 07 mov %al,(%rdi)
39: 48 8d 7f 01 lea 0x1(%rdi),%rdi
3d: 75 f6 jne 0x35
3f: 4c rex.WR