=============================
[ BUG: Invalid wait context ]
6.15.0-syzkaller-11802-g1af80d00e1e0 #0 Not tainted
-----------------------------
syz.5.1940/12737 is trying to lock:
ffffc9000bd50410 (&gpc->lock){....}-{3:3}, at: kvm_xen_set_evtchn_fast+0x1fb/0x9b0 arch/x86/kvm/xen.c:1819
other info that might help us debug this:
context-{2:2}
2 locks held by syz.5.1940/12737:
#0: ffff8880244747d8 (&u->iolock){+.+.}-{4:4}, at: __unix_dgram_recvmsg+0x1e2/0xde0 net/unix/af_unix.c:2499
#1: ffffc9000bd50960 (&kvm->srcu){.?.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline]
#1: ffffc9000bd50960 (&kvm->srcu){.?.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline]
#1: ffffc9000bd50960 (&kvm->srcu){.?.+}-{0:0}, at: kvm_xen_set_evtchn_fast+0x1c3/0x9b0 arch/x86/kvm/xen.c:1817
stack backtrace:
CPU: 1 UID: 0 PID: 12737 Comm: syz.5.1940 Not tainted 6.15.0-syzkaller-11802-g1af80d00e1e0 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 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+0xbcb/0xd20 kernel/locking/lockdep.c:5190
lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
__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:1819
xen_timer_callback+0x109/0x220 arch/x86/kvm/xen.c:140
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x4e0/0xc60 kernel/time/hrtimer.c:1825
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1887
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline]
__sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 3b ac 60 f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 e3 9a 29 f6 65 8b 05 ac 03 35 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc9000402f520 EFLAGS: 00000206
RAX: 1dd32e5a5bc1f300 RBX: 0000000000000a02 RCX: 1dd32e5a5bc1f300
RDX: 0000000000000006 RSI: ffffffff8d979f2e RDI: 0000000000000001
RBP: ffffc9000402f5b8 R08: ffffffff8fa0f5f7 R09: 1ffffffff1f41ebe
R10: dffffc0000000000 R11: fffffbfff1f41ebf R12: dffffc0000000000
R13: 1ffff1100488e86d R14: ffff888024474300 R15: 1ffff92000805ea4
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__skb_try_recv_datagram+0x17c/0x4e0 net/core/datagram.c:267
__unix_dgram_recvmsg+0x2d5/0xde0 net/unix/af_unix.c:2502
sock_recvmsg_nosec+0x186/0x1c0 net/socket.c:1017
____sys_recvmsg+0x3aa/0x460 net/socket.c:2784
___sys_recvmsg+0x1b5/0x510 net/socket.c:2828
do_recvmmsg+0x36a/0x770 net/socket.c:2915
__sys_recvmmsg+0x19d/0x280 net/socket.c:2997
__do_compat_sys_recvmmsg_time32 net/compat.c:418 [inline]
__se_compat_sys_recvmmsg_time32 net/compat.c:414 [inline]
__ia32_compat_sys_recvmmsg_time32+0xbf/0xe0 net/compat.c:414
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xb6/0x2b0 arch/x86/entry/syscall_32.c:306
do_fast_syscall_32+0x34/0x80 arch/x86/entry/syscall_32.c:331
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf710e539
Code: 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f50dd55c EFLAGS: 00000206 ORIG_RAX: 0000000000000151
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000800000c0
RDX: 0000000000010106 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
vkms_vblank_simulate: vblank timer overrun
----------------
Code disassembly (best guess):
0: 74 05 je 0x7
2: e8 3b ac 60 f6 call 0xf660ac42
7: 48 c7 44 24 20 00 00 movq $0x0,0x20(%rsp)
e: 00 00
10: 9c pushf
11: 8f 44 24 20 pop 0x20(%rsp)
15: f6 44 24 21 02 testb $0x2,0x21(%rsp)
1a: 75 4f jne 0x6b
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 e3 9a 29 f6 call 0xf6299b12 <-- trapping instruction
2f: 65 8b 05 ac 03 35 07 mov %gs:0x73503ac(%rip),%eax # 0x73503e2
36: 85 c0 test %eax,%eax
38: 74 40 je 0x7a
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss