Warning: Permanently added '10.128.0.77' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 79.550466][ T9054] BUG: kernel NULL pointer dereference, address: 0000000000000003 [ 79.558378][ T9054] #PF: supervisor write access in kernel mode [ 79.564433][ T9054] #PF: error_code(0x0002) - not-present page [ 79.570389][ T9054] PGD a9a61067 P4D a9a61067 PUD 8fa24067 PMD 0 [ 79.576634][ T9054] Oops: 0002 [#1] PREEMPT SMP KASAN [ 79.581813][ T9054] CPU: 1 PID: 9054 Comm: syz-executor150 Not tainted 5.5.0-rc1-syzkaller #0 [ 79.590501][ T9054] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 79.600572][ T9054] RIP: 0010:mem16_serial_out+0x6c/0x90 [ 79.606013][ T9054] 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 44 cf fd eb c2 e8 2d 45 cf [ 79.625735][ T9054] RSP: 0018:ffffc90001cf7908 EFLAGS: 00010206 [ 79.631797][ T9054] RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 79.639757][ T9054] RDX: 1ffffffff182080e RSI: ffffffff83e38106 RDI: ffffffff8c104070 [ 79.647705][ T9054] RBP: ffffc90001cf7920 R08: ffff88808ffac040 R09: ffffed10431421c6 [ 79.655666][ T9054] R10: ffffed10431421c5 R11: ffff888218a10e2b R12: 00000000000000bf [ 79.663638][ T9054] R13: ffffffff8c104030 R14: ffffc90001cf7a40 R15: ffffffff8c104188 [ 79.671600][ T9054] FS: 0000000000866880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 79.680523][ T9054] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 79.687110][ T9054] CR2: 0000000000000003 CR3: 00000000a64a2000 CR4: 00000000001406e0 [ 79.695075][ T9054] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 79.703030][ T9054] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 79.710982][ T9054] Call Trace: [ 79.714256][ T9054] serial8250_do_startup+0x12b9/0x1cf0 [ 79.719696][ T9054] serial8250_startup+0x62/0x80 [ 79.724537][ T9054] uart_startup+0x452/0x980 [ 79.729019][ T9054] ? uart_proc_show+0x13f0/0x13f0 [ 79.734023][ T9054] ? serial8250_request_std_resource+0x159/0x3d0 [ 79.740345][ T9054] ? serial8250_probe+0x680/0x680 [ 79.745345][ T9054] ? serial8250_request_port+0x16/0x20 [ 79.750814][ T9054] uart_set_info_user+0x13b4/0x1cf0 [ 79.755995][ T9054] ? uart_port_activate+0x200/0x200 [ 79.761193][ T9054] tty_ioctl+0xf60/0x14f0 [ 79.765517][ T9054] ? tty_vhangup+0x30/0x30 [ 79.770023][ T9054] ? tomoyo_path_number_perm+0x454/0x520 [ 79.775761][ T9054] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 79.782034][ T9054] ? tty_vhangup+0x30/0x30 [ 79.786434][ T9054] do_vfs_ioctl+0x977/0x14e0 [ 79.791008][ T9054] ? compat_ioctl_preallocate+0x220/0x220 [ 79.796731][ T9054] ? kmem_cache_free+0x26b/0x320 [ 79.801658][ T9054] ? putname+0xf4/0x130 [ 79.805805][ T9054] ? do_sys_open+0x31d/0x5d0 [ 79.810499][ T9054] ? tomoyo_file_ioctl+0x23/0x30 [ 79.815432][ T9054] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 79.821664][ T9054] ? security_file_ioctl+0x8d/0xc0 [ 79.826940][ T9054] ksys_ioctl+0xab/0xd0 [ 79.831210][ T9054] __x64_sys_ioctl+0x73/0xb0 [ 79.835909][ T9054] do_syscall_64+0xfa/0x790 [ 79.840413][ T9054] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 79.846460][ T9054] RIP: 0033:0x440219 [ 79.850336][ T9054] 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 [ 79.870007][ T9054] RSP: 002b:00007ffc99622388 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 79.878412][ T9054] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440219 [ 79.886378][ T9054] RDX: 0000000020000240 RSI: 000000000000541f RDI: 0000000000000003 [ 79.894395][ T9054] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 79.906890][ T9054] R10: 0000000000401b30 R11: 0000000000000246 R12: 0000000000401aa0 [ 79.914865][ T9054] R13: 0000000000401b30 R14: 0000000000000000 R15: 0000000000000000 [ 79.922845][ T9054] Modules linked in: [ 79.926747][ T9054] CR2: 0000000000000003 [ 79.931470][ T9054] ---[ end trace 2e0575eb0019173e ]--- [ 79.936984][ T9054] RIP: 0010:mem16_serial_out+0x6c/0x90 [ 79.942437][ T9054] 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 44 cf fd eb c2 e8 2d 45 cf [ 79.962248][ T9054] RSP: 0018:ffffc90001cf7908 EFLAGS: 00010206 [ 79.968363][ T9054] RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000 [ 79.976913][ T9054] RDX: 1ffffffff182080e RSI: ffffffff83e38106 RDI: ffffffff8c104070 [ 79.984999][ T9054] RBP: ffffc90001cf7920 R08: ffff88808ffac040 R09: ffffed10431421c6 [ 79.993141][ T9054] R10: ffffed10431421c5 R11: ffff888218a10e2b R12: 00000000000000bf [ 80.001188][ T9054] R13: ffffffff8c104030 R14: ffffc90001cf7a40 R15: ffffffff8c104188 [ 80.009204][ T9054] FS: 0000000000866880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 80.019707][ T9054] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 80.026331][ T9054] CR2: 0000000000000003 CR3: 00000000a64a2000 CR4: 00000000001406e0 [ 80.034333][ T9054] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 80.042385][ T9054] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 80.050406][ T9054] Kernel panic - not syncing: Fatal exception [ 80.057872][ T9054] Kernel Offset: disabled [ 80.062246][ T9054] Rebooting in 86400 seconds..