[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.44' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 59.043446][ T6852] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor765/6852 [ 59.053072][ T6852] caller is lockdep_hardirqs_on_prepare+0x5e/0x450 [ 59.060008][ T6852] CPU: 1 PID: 6852 Comm: syz-executor765 Not tainted 5.9.0-syzkaller #0 [ 59.068419][ T6852] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.078447][ T6852] Call Trace: [ 59.081717][ T6852] dump_stack+0x198/0x1fb [ 59.086036][ T6852] check_preemption_disabled+0x128/0x130 [ 59.091646][ T6852] lockdep_hardirqs_on_prepare+0x5e/0x450 [ 59.097343][ T6852] trace_hardirqs_on+0x5b/0x1c0 [ 59.102171][ T6852] __bad_area_nosemaphore+0xc6/0x4f0 [ 59.107435][ T6852] do_user_addr_fault+0x852/0xbf0 [ 59.112443][ T6852] exc_page_fault+0xa8/0x190 [ 59.117014][ T6852] ? asm_exc_page_fault+0x8/0x30 [ 59.121933][ T6852] asm_exc_page_fault+0x1e/0x30 [ 59.126757][ T6852] RIP: 0033:0x424260 [ 59.130629][ T6852] 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 [ 59.150216][ T6852] RSP: 002b:00007ffeadb4bcb8 EFLAGS: 00010246 [ 59.156269][ T6852] RAX: 0000000000000000 RBX: 00007ffeadb4bce0 RCX: 0000000000000000 [ 59.164223][ T6852] RDX: 0000000000000010 RSI: 000000000000000f RDI: 0000000000000000 [ 59.172442][ T6852] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 [ 59.180397][ T6852] R10: 0000000000000000 R11: 000000000000000f R12: 0000000000401de0 [ 59.188350][ T6852] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 59.196459][ T6852] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor765/6852 [ 59.205853][ T6852] caller is lockdep_hardirqs_on+0x34/0x110 [ 59.211635][ T6852] CPU: 1 PID: 6852 Comm: syz-executor765 Not tainted 5.9.0-syzkaller #0 [ 59.219931][ T6852] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.229970][ T6852] Call Trace: [ 59.233238][ T6852] dump_stack+0x198/0x1fb [ 59.237552][ T6852] check_preemption_disabled+0x128/0x130 [ 59.243162][ T6852] ? __bad_area_nosemaphore+0xc6/0x4f0 [ 59.248598][ T6852] lockdep_hardirqs_on+0x34/0x110 [ 59.253602][ T6852] __bad_area_nosemaphore+0xc6/0x4f0 [ 59.258988][ T6852] do_user_addr_fault+0x852/0xbf0 [ 59.263996][ T6852] exc_page_fault+0xa8/0x190 [ 59.268564][ T6852] ? asm_exc_page_fault+0x8/0x30 [ 59.273483][ T6852] asm_exc_page_fault+0x1e/0x30 [ 59.278326][ T6852] RIP: 0033:0x424260 [ 59.282198][ T6852] 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 [ 59.301781][ T6852] RSP: 002b:00007ffeadb4bcb8 EFLAGS: 00010246 [ 59.307828][ T6852] RAX: 0000000000000000 RBX: 00007ffeadb4bce0 RCX: 0000000000000000 [ 59.315774][ T6852] RDX: 0000000000000010 RSI: 000000000000000f RDI: 0000000000000000 [ 59.323732][ T6852] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 [ 59.331682][ T6852] R10: 0000000000000000 R11: 000000000000000f R12: 0000000000401de0 [ 59.339723][ T6852] R13: 0000000000401e70 R14: 000000000