Warning: Permanently added '10.128.0.211' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 81.909265][ T9746] ================================================================== [ 81.909339][ T9746] BUG: KASAN: null-ptr-deref in insert_char+0x206/0x400 [ 81.909352][ T9746] Read of size 4294967294 at addr 0000000000000010 by task syz-executor219/9746 [ 81.909356][ T9746] [ 81.909371][ T9746] CPU: 0 PID: 9746 Comm: syz-executor219 Not tainted 5.5.0-rc5-syzkaller #0 [ 81.909380][ T9746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.909385][ T9746] Call Trace: [ 81.909401][ T9746] dump_stack+0x197/0x210 [ 81.909416][ T9746] ? insert_char+0x206/0x400 [ 81.909432][ T9746] ? insert_char+0x206/0x400 [ 81.909450][ T9746] __kasan_report.cold+0x5/0x41 [ 81.909469][ T9746] ? insert_char+0x206/0x400 [ 81.909486][ T9746] kasan_report+0x12/0x20 [ 81.909502][ T9746] check_memory_region+0x134/0x1a0 [ 81.909517][ T9746] memmove+0x24/0x50 [ 81.909534][ T9746] insert_char+0x206/0x400 [ 81.909557][ T9746] do_con_trol+0x41a6/0x61b0 [ 81.909580][ T9746] ? reset_palette+0x190/0x190 [ 81.909594][ T9746] ? __kasan_check_read+0x11/0x20 [ 81.909612][ T9746] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 81.909636][ T9746] do_con_write.part.0+0xfd9/0x1ef0 [ 81.909672][ T9746] ? do_con_trol+0x61b0/0x61b0 [ 81.909686][ T9746] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 81.909699][ T9746] ? add_wait_queue+0x112/0x170 [ 81.909713][ T9746] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 81.909734][ T9746] ? trace_hardirqs_on+0x67/0x240 [ 81.909756][ T9746] con_write+0x46/0xd0 [ 81.909777][ T9746] n_tty_write+0x40e/0x1080 [ 81.909809][ T9746] ? n_tty_read+0x1bf0/0x1bf0 [ 81.909827][ T9746] ? prepare_to_wait_exclusive+0x320/0x320 [ 81.909849][ T9746] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 81.909866][ T9746] ? _copy_from_user+0x12c/0x1a0 [ 81.909885][ T9746] tty_write+0x496/0x7f0 [ 81.909902][ T9746] ? n_tty_read+0x1bf0/0x1bf0 [ 81.909921][ T9746] __vfs_write+0x8a/0x110 [ 81.909935][ T9746] ? put_tty_driver+0x20/0x20 [ 81.909952][ T9746] vfs_write+0x268/0x5d0 [ 81.909973][ T9746] ksys_write+0x14f/0x290 [ 81.909990][ T9746] ? __ia32_sys_read+0xb0/0xb0 [ 81.910007][ T9746] ? do_syscall_64+0x26/0x790 [ 81.910020][ T9746] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.910034][ T9746] ? do_syscall_64+0x26/0x790 [ 81.910054][ T9746] __x64_sys_write+0x73/0xb0 [ 81.910071][ T9746] do_syscall_64+0xfa/0x790 [ 81.910095][ T9746] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.910107][ T9746] RIP: 0033:0x4404f9 [ 81.910121][ T9746] 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 81.910129][ T9746] RSP: 002b:00007ffcaea1f808 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 81.910143][ T9746] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 81.910152][ T9746] RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004 [ 81.910161][ T9746] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 81.910170][ T9746] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 81.910179][ T9746] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 81.910202][ T9746] ================================================================== [ 81.910207][ T9746] Disabling lock debugging due to kernel taint [ 81.910215][ T9746] Kernel panic - not syncing: panic_on_warn set ... [ 81.910230][ T9746] CPU: 0 PID: 9746 Comm: syz-executor219 Tainted: G B 5.5.0-rc5-syzkaller #0 [ 81.910237][ T9746] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.910240][ T9746] Call Trace: [ 81.910252][ T9746] dump_stack+0x197/0x210 [ 81.910269][ T9746] panic+0x2e3/0x75c [ 81.910283][ T9746] ? add_taint.cold+0x16/0x16 [ 81.910302][ T9746] ? trace_hardirqs_on+0x67/0x240 [ 81.910314][ T9746] ? trace_hardirqs_on+0x5e/0x240 [ 81.910329][ T9746] ? insert_char+0x206/0x400 [ 81.910341][ T9746] end_report+0x47/0x4f [ 81.910352][ T9746] ? insert_char+0x206/0x400 [ 81.910364][ T9746] __kasan_report.cold+0xe/0x41 [ 81.910379][ T9746] ? insert_char+0x206/0x400 [ 81.910391][ T9746] kasan_report+0x12/0x20 [ 81.910403][ T9746] check_memory_region+0x134/0x1a0 [ 81.910415][ T9746] memmove+0x24/0x50 [ 81.910429][ T9746] insert_char+0x206/0x400 [ 81.910446][ T9746] do_con_trol+0x41a6/0x61b0 [ 81.910463][ T9746] ? reset_palette+0x190/0x190 [ 81.910477][ T9746] ? __kasan_check_read+0x11/0x20 [ 81.910493][ T9746] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 81.910511][ T9746] do_con_write.part.0+0xfd9/0x1ef0 [ 81.910535][ T9746] ? do_con_trol+0x61b0/0x61b0 [ 81.910547][ T9746] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 81.910559][ T9746] ? add_wait_queue+0x112/0x170 [ 81.910572][ T9746] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 81.910587][ T9746] ? trace_hardirqs_on+0x67/0x240 [ 81.910602][ T9746] con_write+0x46/0xd0 [ 81.910618][ T9746] n_tty_write+0x40e/0x1080 [ 81.910641][ T9746] ? n_tty_read+0x1bf0/0x1bf0 [ 81.910656][ T9746] ? prepare_to_wait_exclusive+0x320/0x320 [ 81.910674][ T9746] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 81.910689][ T9746] ? _copy_from_user+0x12c/0x1a0 [ 81.910704][ T9746] tty_write+0x496/0x7f0 [ 81.910721][ T9746] ? n_tty_read+0x1bf0/0x1bf0 [ 81.910737][ T9746] __vfs_write+0x8a/0x110 [ 81.910750][ T9746] ? put_tty_driver+0x20/0x20 [ 81.910765][ T9746] vfs_write+0x268/0x5d0 [ 81.910780][ T9746] ksys_write+0x14f/0x290 [ 81.910795][ T9746] ? __ia32_sys_read+0xb0/0xb0 [ 81.910811][ T9746] ? do_syscall_64+0x26/0x790 [ 81.910824][ T9746] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.910838][ T9746] ? do_syscall_64+0x26/0x790 [ 81.910855][ T9746] __x64_sys_write+0x73/0xb0 [ 81.910870][ T9746] do_syscall_64+0xfa/0x790 [ 81.910886][ T9746] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 81.910895][ T9746] RIP: 0033:0x4404f9 [ 81.910909][ T9746] 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 5b 14 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 81.910916][ T9746] RSP: 002b:00007ffcaea1f808 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 81.910929][ T9746] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 81.910937][ T9746] RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004 [ 81.910945][ T9746] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 81.910952][ T9746] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 81.910960][ T9746] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 81.912423][ T9746] Kernel Offset: disabled [ 82.542669][ T9746] Rebooting in 86400 seconds..