last executing test programs:

52.462485ms ago: executing program 1 (id=2):
openat(0xffffffffffffff9c, &(0x7f0000000040)='/dev/vcsu', 0x0, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000080)='/dev/vcsu', 0x1, 0x0)
openat(0xffffffffffffff9c, &(0x7f00000000c0)='/dev/vcsu', 0x2, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000100)='/dev/vcsu', 0x800, 0x0)

36.301137ms ago: executing program 3 (id=4):
socket$isdn(0x22, 0x3, 0x0)

16.355298ms ago: executing program 3 (id=6):
fanotify_init(0x0, 0x0)

15.122648ms ago: executing program 0 (id=1):
syz_open_dev$sndpcmp(&(0x7f0000000040), 0x0, 0x0)
syz_open_dev$sndpcmp(&(0x7f0000000080), 0x0, 0x1)
syz_open_dev$sndpcmp(&(0x7f00000000c0), 0x0, 0x2)
syz_open_dev$sndpcmp(&(0x7f0000000100), 0x0, 0x800)
syz_open_dev$sndpcmp(&(0x7f0000000140), 0xa, 0x0)
syz_open_dev$sndpcmp(&(0x7f0000000180), 0xa, 0x1)
syz_open_dev$sndpcmp(&(0x7f00000001c0), 0xa, 0x2)
syz_open_dev$sndpcmp(&(0x7f0000000200), 0xa, 0x800)
syz_open_dev$sndpcmp(&(0x7f0000000240), 0x14, 0x0)
syz_open_dev$sndpcmp(&(0x7f0000000280), 0x14, 0x1)
syz_open_dev$sndpcmp(&(0x7f00000002c0), 0x14, 0x2)
syz_open_dev$sndpcmp(&(0x7f0000000300), 0x14, 0x800)
syz_open_dev$sndpcmp(&(0x7f0000000340), 0x1e, 0x0)
syz_open_dev$sndpcmp(&(0x7f0000000380), 0x1e, 0x1)
syz_open_dev$sndpcmp(&(0x7f00000003c0), 0x1e, 0x2)
syz_open_dev$sndpcmp(&(0x7f0000000400), 0x1e, 0x800)
syz_open_dev$sndpcmp(&(0x7f0000000440), 0x28, 0x0)
syz_open_dev$sndpcmp(&(0x7f0000000480), 0x28, 0x1)
syz_open_dev$sndpcmp(&(0x7f00000004c0), 0x28, 0x2)
syz_open_dev$sndpcmp(&(0x7f0000000500), 0x28, 0x800)

8.726039ms ago: executing program 2 (id=3):
openat(0xffffffffffffff9c, &(0x7f0000000040)='/dev/vhost-vsock', 0x2, 0x0)

0s ago: executing program 4 (id=5):
tkill(0x0, 0x0)

0s ago: executing program 3 (id=8):
io_destroy(0x0)

kernel console output (not intermixed with test programs):

[   11.530034][ T3715] eql: remember to turn off Van-Jacobson compression on your slave devices
Starting crond: OK
[   11.563135][  T136] gvnic 0000:00:00.0 enp0s0: Device link is up.
[   11.572726][    T9] IPv6: ADDRCONF(NETDEV_CHANGE): enp0s0: link becomes ready
Starting sshd: OK

syzkaller
Warning: Permanently added '10.128.1.196' (ED25519) to the list of known hosts.
syzkaller login: [   32.955503][ T4033] cgroup: Unknown subsys name 'net'
[   33.247661][ T4033] cgroup: Unknown subsys name 'rlimit'
Setting up swapspace version 1, size = 127995904 bytes
[   33.538680][ T4033] Adding 124996k swap on ./swap-file.  Priority:0 extents:1 across:124996k SSFS
[   34.318463][ T4054] Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
[   34.319776][ T4054] Modules linked in:
[   34.320403][ T4054] CPU: 0 PID: 4054 Comm: syz.3.8 Not tainted 5.15.189-syzkaller #0
[   34.321657][ T4054] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
[   34.323194][ T4054] pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
[   34.324403][ T4054] pc : lookup_ioctx+0x108/0x7d0
[   34.325161][ T4054] lr : lookup_ioctx+0xe4/0x7d0
[   34.325870][ T4054] sp : ffff80001f4b7c40
[   34.326483][ T4054] x29: ffff80001f4b7c40 x28: ffff0000dac8d1c0 x27: 0000000000000000
[   34.327756][ T4054] x26: 1fffe0001b591a38 x25: 1ffff00003e96fd6 x24: ffff0000c1aca280
[   34.329039][ T4054] x23: dfff800000000000 x22: 00000000fffffff2 x21: 0000000000000000
[   34.330408][ T4054] x20: ffff0000dac8d1c0 x19: 0000000000000000 x18: 0000000000000000
[   34.331720][ T4054] x17: 0000000000000000 x16: ffff800008a19714 x15: 0000000000000000
[   34.333068][ T4054] x14: 0000000000000000 x13: 1ffff0000282e06b x12: 0000000000ff0100
[   34.334410][ T4054] x11: 0000000000000000 x10: 0000000000000000 x9 : 0000ffffffffffff
[   34.335739][ T4054] x8 : 0000000000000000 x7 : ffff800008750ed4 x6 : 0000000000000000
[   34.336935][ T4054] x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
[   34.338164][ T4054] x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
[   34.339426][ T4054] Call trace:
[   34.339906][ T4054]  lookup_ioctx+0x108/0x7d0
[   34.340556][ T4054]  __arm64_sys_io_destroy+0x90/0x1b8
SYZFAIL: failed to recv rpc
[   34.341368][ T4054]  invoke_syscall+0x98/0x2b8
fd=3 want=4 recv=0 n=0 (errno 9: Bad file descriptor)
[   34.342051][ T4054]  el0_svc_common+0x138/0x258
[   34.342814][ T4054]  do_el0_svc+0x58/0x14c
[   34.343457][ T4054]  el0_svc+0x78/0x1e0
[   34.344081][ T4054]  el0t_64_sync_handler+0xcc/0xe4
[   34.344830][ T4054]  el0t_64_sync+0x1a0/0x1a4
[   34.345498][ T4054] Code: d503229f 2a1f03f6 2a1f03e0 b8400953 (2a1603e1) 
[   34.346525][ T4054] ---[ end trace 0cd5d379432929b6 ]---
[   34.541399][ T4054] Kernel panic - not syncing: Oops - BTI: Fatal exception
[   34.542505][ T4054] SMP: stopping secondary CPUs
[   34.543333][ T4054] Kernel Offset: disabled
[   34.544038][ T4054] CPU features: 0x8,000003c1,7d33ffd9
[   34.544912][ T4054] Memory Limit: none
[   34.739011][ T4054] Rebooting in 86400 seconds..