Warning: Permanently added '10.128.0.200' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 81.514280][ T9374] BUG: kernel NULL pointer dereference, address: 0000000000000002 [ 81.522247][ T9374] #PF: supervisor write access in kernel mode [ 81.528403][ T9374] #PF: error_code(0x0002) - not-present page [ 81.534363][ T9374] PGD 99645067 P4D 99645067 PUD 927c5067 PMD 0 [ 81.540589][ T9374] Oops: 0002 [#1] PREEMPT SMP KASAN [ 81.545782][ T9374] CPU: 1 PID: 9374 Comm: syz-executor246 Not tainted 5.5.0-rc2-syzkaller #0 [ 81.554445][ T9374] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.564600][ T9374] RIP: 0010:mem16_serial_out+0x6c/0x90 [ 81.570042][ T9374] Code: b6 8d e9 00 00 00 49 8d 7d 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 19 48 63 db 49 03 5d 40 <66> 44 89 23 5b 41 5c 41 5d 5d c3 e8 d4 2d cf fd eb c2 e8 2d 2e cf [ 81.589628][ T9374] RSP: 0018:ffffc90001fa78e8 EFLAGS: 00010202 [ 81.595670][ T9374] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 81.603621][ T9374] RDX: 1ffffffff182040e RSI: ffffffff83e397f6 RDI: ffffffff8c102070 [ 81.611580][ T9374] RBP: ffffc90001fa7900 R08: ffff888095842080 R09: ffffed10144ce1c6 [ 81.619542][ T9374] R10: ffffed10144ce1c5 R11: ffff8880a2670e2b R12: 0000000000000001 [ 81.627505][ T9374] R13: ffffffff8c102030 R14: ffffc90001fa7a40 R15: ffffffff8c102188 [ 81.635469][ T9374] FS: 000000000177c880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 81.644383][ T9374] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 81.650944][ T9374] CR2: 0000000000000002 CR3: 00000000a6ab1000 CR4: 00000000001406e0 [ 81.658924][ T9374] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 81.666882][ T9374] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 81.674830][ T9374] Call Trace: [ 81.678121][ T9374] serial8250_clear_fifos.part.0+0x3a/0xb0 [ 81.683920][ T9374] serial8250_do_startup+0x426/0x1cf0 [ 81.689272][ T9374] serial8250_startup+0x62/0x80 [ 81.694107][ T9374] uart_startup+0x452/0x980 [ 81.698685][ T9374] ? uart_proc_show+0x13f0/0x13f0 [ 81.703687][ T9374] ? serial8250_request_std_resource+0x159/0x3d0 [ 81.709996][ T9374] ? serial8250_probe+0x680/0x680 [ 81.715013][ T9374] ? serial8250_request_port+0x16/0x20 [ 81.720461][ T9374] uart_set_info_user+0x13b4/0x1cf0 [ 81.725649][ T9374] ? uart_port_activate+0x200/0x200 [ 81.730826][ T9374] tty_ioctl+0xf60/0x14f0 [ 81.735146][ T9374] ? tty_vhangup+0x30/0x30 [ 81.739541][ T9374] ? tomoyo_path_number_perm+0x454/0x520 [ 81.745155][ T9374] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 81.753122][ T9374] ? tty_vhangup+0x30/0x30 [ 81.757517][ T9374] do_vfs_ioctl+0x977/0x14e0 [ 81.762104][ T9374] ? compat_ioctl_preallocate+0x220/0x220 [ 81.767804][ T9374] ? kmem_cache_free+0x26b/0x320 [ 81.772764][ T9374] ? putname+0xf4/0x130 [ 81.776928][ T9374] ? do_sys_open+0x31d/0x5d0 [ 81.781613][ T9374] ? tomoyo_file_ioctl+0x23/0x30 [ 81.786631][ T9374] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.792881][ T9374] ? security_file_ioctl+0x8d/0xc0 [ 81.797998][ T9374] ksys_ioctl+0xab/0xd0 [ 81.802134][ T9374] __x64_sys_ioctl+0x73/0xb0 [ 81.806721][ T9374] do_syscall_64+0xfa/0x790 [ 81.811228][ T9374] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.817104][ T9374] RIP: 0033:0x440219 [ 81.820983][ T9374] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 81.840576][ T9374] RSP: 002b:00007ffe4d9e7ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 81.848978][ T9374] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219 [ 81.856939][ T9374] RDX: 0000000020000240 RSI: 000000000000541f RDI: 0000000000000003 [ 81.864913][ T9374] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 81.872882][ T9374] R10: 0000000000401b30 R11: 0000000000000246 R12: 0000000000401aa0 [ 81.880850][ T9374] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 81.888926][ T9374] Modules linked in: [ 81.892904][ T9374] CR2: 0000000000000002 [ 81.898107][ T9374] ---[ end trace 3a7aebb81a9b5361 ]--- [ 81.903614][ T9374] RIP: 0010:mem16_serial_out+0x6c/0x90 [ 81.909251][ T9374] Code: b6 8d e9 00 00 00 49 8d 7d 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 19 48 63 db 49 03 5d 40 <66> 44 89 23 5b 41 5c 41 5d 5d c3 e8 d4 2d cf fd eb c2 e8 2d 2e cf [ 81.928913][ T9374] RSP: 0018:ffffc90001fa78e8 EFLAGS: 00010202 [ 81.935015][ T9374] RAX: dffffc0000000000 RBX: 0000000000000002 RCX: 0000000000000000 [ 81.943173][ T9374] RDX: 1ffffffff182040e RSI: ffffffff83e397f6 RDI: ffffffff8c102070 [ 81.951188][ T9374] RBP: ffffc90001fa7900 R08: ffff888095842080 R09: ffffed10144ce1c6 [ 81.959634][ T9374] R10: ffffed10144ce1c5 R11: ffff8880a2670e2b R12: 0000000000000001 [ 81.967647][ T9374] R13: ffffffff8c102030 R14: ffffc90001fa7a40 R15: ffffffff8c102188 [ 81.975651][ T9374] FS: 000000000177c880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 81.984573][ T9374] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 81.991202][ T9374] CR2: 0000000000000002 CR3: 00000000a6ab1000 CR4: 00000000001406e0 [ 81.999217][ T9374] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 82.007204][ T9374] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 82.015183][ T9374] Kernel panic - not syncing: Fatal exception [ 82.022783][ T9374] Kernel Offset: disabled [ 82.027119][ T9374] Rebooting in 86400 seconds..