[ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.4' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 60.395415][ T6890] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor815/6890 [ 60.404793][ T6890] caller is lockdep_hardirqs_on_prepare+0x5e/0x450 [ 60.412165][ T6890] CPU: 0 PID: 6890 Comm: syz-executor815 Not tainted 5.9.0-syzkaller #0 [ 60.420484][ T6890] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.430520][ T6890] Call Trace: [ 60.433796][ T6890] dump_stack+0x198/0x1fb [ 60.438108][ T6890] check_preemption_disabled+0x128/0x130 [ 60.443723][ T6890] lockdep_hardirqs_on_prepare+0x5e/0x450 [ 60.449422][ T6890] trace_hardirqs_on+0x5b/0x1c0 [ 60.454247][ T6890] __bad_area_nosemaphore+0xc6/0x4f0 [ 60.459513][ T6890] do_user_addr_fault+0x852/0xbf0 [ 60.464558][ T6890] exc_page_fault+0xa8/0x190 [ 60.469125][ T6890] ? asm_exc_page_fault+0x8/0x30 [ 60.474035][ T6890] asm_exc_page_fault+0x1e/0x30 [ 60.478858][ T6890] RIP: 0033:0x424360 [ 60.482729][ T6890] 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 [ 60.502321][ T6890] RSP: 002b:00007ffc57ef97a8 EFLAGS: 00010246 [ 60.508398][ T6890] RAX: 0000000000000000 RBX: 00007ffc57ef97d0 RCX: 0000000000000000 [ 60.516346][ T6890] RDX: 0000000000000010 RSI: 000000000000000f RDI: 0000000000000000 [ 60.524294][ T6890] RBP: 0000000000000004 R08: 0000000000000000 R09: 00000000004002c8 [ 60.532368][ T6890] R10: 0000000000000000 R11: 000000000000000f R12: 0000000000401ee0 [ 60.540315][ T6890] R13: 0000000000401f70 R14: 0000000000000000 R15: 0000000000000000 [ 60.548357][ T6890] BUG: using __this_cpu_read() in preemptible [00000000] code: syz-executor815/6890 [ 60.557749][ T6890] caller is lockdep_hardirqs_on+0x34/0x110 [ 60.563533][ T6890] CPU: 0 PID: 6890 Comm: syz-executor815 Not tainted 5.9.0-syzkaller #0 [ 60.571827][ T6890] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.581871][ T6890] Call Trace: [ 60.585141][ T6890] dump_stack+0x198/0x1fb [ 60.589463][ T6890] check_preemption_disabled+0x128/0x130 [ 60.595074][ T6890] ? __bad_area_nosemaphore+0xc6/0x4f0 [ 60.600637][ T6890] lockdep_hardirqs_on+0x34/0x110 [ 60.605645][ T6890] __bad_area_nosemaphore+0xc6/0x4f0 [ 60.610910][ T6890] do_user_addr_fault+0x852/0xbf0 [ 60.615916][ T6890] exc_page_fault+0xa8/0x190 [ 60.620480][ T6890] ? asm_exc_page_fault+0x8/0x30 [ 60.625392][ T6890] asm_exc_page_fault+0x1e/0x30 [ 60.630215][ T6890] RIP: 0033:0x424360 [ 60.634100][ T6890] 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