Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   67.556131][ T8479] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor465/8479
[   67.566006][ T8479] caller is lockdep_hardirqs_on_prepare+0x5e/0x410
[   67.573045][ T8479] CPU: 0 PID: 8479 Comm: syz-executor465 Not tainted 5.9.0-syzkaller #0
[   67.581859][ T8479] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   67.591911][ T8479] Call Trace:
[   67.595206][ T8479]  dump_stack+0x107/0x163
[   67.599525][ T8479]  check_preemption_disabled+0x123/0x130
[   67.605157][ T8479]  lockdep_hardirqs_on_prepare+0x5e/0x410
[   67.611392][ T8479]  trace_hardirqs_on+0x5b/0x1c0
[   67.616228][ T8479]  __bad_area_nosemaphore+0xc6/0x400
[   67.623060][ T8479]  do_user_addr_fault+0x7d7/0xb40
[   67.628392][ T8479]  exc_page_fault+0x9e/0x180
[   67.635109][ T8479]  ? asm_exc_page_fault+0x8/0x30
[   67.640390][ T8479]  asm_exc_page_fault+0x1e/0x30
[   67.645649][ T8479] RIP: 0033:0x4242d0
[   67.650025][ T8479] Code: 66 0f ef c0 66 0f ef c9 66 0f ef d2 66 0f ef db 48 89 f8 48 89 f9 48 81 e1 ff 0f 00 00 48 81 f9 cf 0f 00 00 77 74 48 83 e0 f0 <66> 0f 74 00 66 0f 74 48 10 66 0f 74 50 20 66 0f 74 58 30 66 0f d7
[   67.672841][ T8479] RSP: 002b:00007ffed72c8e88 EFLAGS: 00010246
[   67.678910][ T8479] RAX: 0000000000000000 RBX: 00007ffed72c8eb0 RCX: 0000000000000000
[   67.687045][ T8479] RDX: 0000000000000010 RSI: 000000000000000f RDI: 0000000000000000
[   67.695180][ T8479] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
[   67.704119][ T8479] R10: 0000000000000000 R11: 000000000000000f R12: 0000000000401e50
[   67.712422][ T8479] R13: 0000000000401ee0 R14: 0000000000000000 R15: 0000000000000000
[   67.720850][ T8479] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor465/8479
[   67.730583][ T8479] caller is lockdep_hardirqs_on+0x38/0x110
[   67.737562][ T8479] CPU: 0 PID: 8479 Comm: syz-executor465 Not tainted 5.9.0-syzkaller #0
[   67.745913][ T8479] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   67.756658][ T8479] Call Trace:
[   67.759986][ T8479]  dump_stack+0x107/0x163
[   67.764341][ T8479]  check_preemption_disabled+0x123/0x130
[   67.771046][ T8479]  ? __bad_area_nosemaphore+0xc6/0x400
[   67.777203][ T8479]  lockdep_hardirqs_on+0x38/0x110
[   67.782834][ T8479]  __bad_area_nosemaphore+0xc6/0x400
[   67.788112][ T8479]  do_user_addr_fault+0x7d7/0xb40
[   67.793150][ T8479]  exc_page_fault+0x9e/0x180
[   67.798884][ T8479]  ? asm_exc_page_fault+0x8/0x30
[   67.803820][ T8479]  asm_exc_page_fault+0x1e/0x30
[   67.809044][ T8479] RIP: 0033:0x4242d0
[   67.813036][ T8479] Code: 66 0f ef c0 66 0f ef c9 66 0f ef d2 66 0f ef db 48 89 f8 48 89 f9 48 81 e1 ff 0f 00 00 48 81 f9 cf 0f 00 00 77 74 48 83 e0 f0 <66> 0f 74 00 66 0f 74 48 10 66 0f 74 50 20 66 0f 74 58 30 66 0f d7
[   67.838300][ T8479] RSP: 002b:00007ffed72c8e88 EFLAGS: 00010246
[   67.845430][ T8479] RAX: 0000000000000000 RBX: 00007ffed72c8eb0 RCX: 0000000000000000
[   67.85630