[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.433603][ T27] audit: type=1800 audit(1576048867.497:25): pid=8931 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 60.466549][ T27] audit: type=1800 audit(1576048867.497:26): pid=8931 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 60.519704][ T27] audit: type=1800 audit(1576048867.497:27): pid=8931 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.193' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 68.549306][ T9087] ================================================================== [ 68.549362][ T9087] BUG: KASAN: user-memory-access in insert_char+0x206/0x400 [ 68.549374][ T9087] Read of size 212 at addr 00000000ffffff3a by task syz-executor094/9087 [ 68.549378][ T9087] [ 68.549393][ T9087] CPU: 1 PID: 9087 Comm: syz-executor094 Not tainted 5.5.0-rc1-syzkaller #0 [ 68.549401][ T9087] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.549406][ T9087] Call Trace: [ 68.549423][ T9087] dump_stack+0x197/0x210 [ 68.549438][ T9087] ? insert_char+0x206/0x400 [ 68.549452][ T9087] ? insert_char+0x206/0x400 [ 68.549472][ T9087] __kasan_report.cold+0x5/0x41 [ 68.549488][ T9087] ? insert_char+0x206/0x400 [ 68.549504][ T9087] kasan_report+0x12/0x20 [ 68.549517][ T9087] check_memory_region+0x134/0x1a0 [ 68.549529][ T9087] memmove+0x24/0x50 [ 68.549545][ T9087] insert_char+0x206/0x400 [ 68.549564][ T9087] do_con_trol+0x41a6/0x61b0 [ 68.549584][ T9087] ? reset_palette+0x190/0x190 [ 68.549598][ T9087] ? __kasan_check_read+0x11/0x20 [ 68.549617][ T9087] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 68.549639][ T9087] do_con_write.part.0+0xfd9/0x1ef0 [ 68.549668][ T9087] ? do_con_trol+0x61b0/0x61b0 [ 68.549682][ T9087] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 68.549694][ T9087] ? add_wait_queue+0x112/0x170 [ 68.549711][ T9087] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 68.549737][ T9087] ? trace_hardirqs_on+0x67/0x240 [ 68.549762][ T9087] con_write+0x46/0xd0 [ 68.549779][ T9087] n_tty_write+0x40e/0x1080 [ 68.549808][ T9087] ? n_tty_read+0x1bf0/0x1bf0 [ 68.549829][ T9087] ? prepare_to_wait_exclusive+0x320/0x320 [ 68.549852][ T9087] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 68.549865][ T9087] ? _copy_from_user+0x12c/0x1a0 [ 68.549880][ T9087] tty_write+0x496/0x7f0 [ 68.549899][ T9087] ? n_tty_read+0x1bf0/0x1bf0 [ 68.549917][ T9087] __vfs_write+0x8a/0x110 [ 68.549940][ T9087] ? put_tty_driver+0x20/0x20 [ 68.549959][ T9087] vfs_write+0x268/0x5d0 [ 68.549982][ T9087] ksys_write+0x14f/0x290 [ 68.549998][ T9087] ? __ia32_sys_read+0xb0/0xb0 [ 68.550015][ T9087] ? do_syscall_64+0x26/0x790 [ 68.550029][ T9087] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.550046][ T9087] ? do_syscall_64+0x26/0x790 [ 68.550065][ T9087] __x64_sys_write+0x73/0xb0 [ 68.550081][ T9087] do_syscall_64+0xfa/0x790 [ 68.550098][ T9087] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.550109][ T9087] RIP: 0033:0x4404f9 [ 68.550123][ T9087] 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 [ 68.550131][ T9087] RSP: 002b:00007fffaf543218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 68.550145][ T9087] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 68.550153][ T9087] RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004 [ 68.550162][ T9087] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 68.550170][ T9087] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 68.550178][ T9087] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 68.550199][ T9087] ================================================================== [ 68.550203][ T9087] Disabling lock debugging due to kernel taint [ 68.550210][ T9087] Kernel panic - not syncing: panic_on_warn set ... [ 68.550224][ T9087] CPU: 1 PID: 9087 Comm: syz-executor094 Tainted: G B 5.5.0-rc1-syzkaller #0 [ 68.550230][ T9087] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.550234][ T9087] Call Trace: [ 68.550246][ T9087] dump_stack+0x197/0x210 [ 68.550262][ T9087] panic+0x2e3/0x75c [ 68.550274][ T9087] ? add_taint.cold+0x16/0x16 [ 68.550292][ T9087] ? trace_hardirqs_on+0x67/0x240 [ 68.550305][ T9087] ? trace_hardirqs_on+0x5e/0x240 [ 68.550318][ T9087] ? insert_char+0x206/0x400 [ 68.550330][ T9087] end_report+0x47/0x4f [ 68.550343][ T9087] ? insert_char+0x206/0x400 [ 68.550363][ T9087] __kasan_report.cold+0xe/0x41 [ 68.550377][ T9087] ? insert_char+0x206/0x400 [ 68.550389][ T9087] kasan_report+0x12/0x20 [ 68.550402][ T9087] check_memory_region+0x134/0x1a0 [ 68.550414][ T9087] memmove+0x24/0x50 [ 68.550427][ T9087] insert_char+0x206/0x400 [ 68.550446][ T9087] do_con_trol+0x41a6/0x61b0 [ 68.550462][ T9087] ? reset_palette+0x190/0x190 [ 68.550478][ T9087] ? __kasan_check_read+0x11/0x20 [ 68.550494][ T9087] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 68.550511][ T9087] do_con_write.part.0+0xfd9/0x1ef0 [ 68.550533][ T9087] ? do_con_trol+0x61b0/0x61b0 [ 68.550544][ T9087] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 68.550555][ T9087] ? add_wait_queue+0x112/0x170 [ 68.550567][ T9087] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 68.550581][ T9087] ? trace_hardirqs_on+0x67/0x240 [ 68.550597][ T9087] con_write+0x46/0xd0 [ 68.550609][ T9087] n_tty_write+0x40e/0x1080 [ 68.550628][ T9087] ? n_tty_read+0x1bf0/0x1bf0 [ 68.550641][ T9087] ? prepare_to_wait_exclusive+0x320/0x320 [ 68.550656][ T9087] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 68.550668][ T9087] ? _copy_from_user+0x12c/0x1a0 [ 68.550680][ T9087] tty_write+0x496/0x7f0 [ 68.550698][ T9087] ? n_tty_read+0x1bf0/0x1bf0 [ 68.550711][ T9087] __vfs_write+0x8a/0x110 [ 68.550722][ T9087] ? put_tty_driver+0x20/0x20 [ 68.550740][ T9087] vfs_write+0x268/0x5d0 [ 68.550754][ T9087] ksys_write+0x14f/0x290 [ 68.550766][ T9087] ? __ia32_sys_read+0xb0/0xb0 [ 68.550780][ T9087] ? do_syscall_64+0x26/0x790 [ 68.550792][ T9087] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.550805][ T9087] ? do_syscall_64+0x26/0x790 [ 68.550824][ T9087] __x64_sys_write+0x73/0xb0 [ 68.550837][ T9087] do_syscall_64+0xfa/0x790 [ 68.550850][ T9087] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.550859][ T9087] RIP: 0033:0x4404f9 [ 68.550875][ T9087] 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 [ 68.550881][ T9087] RSP: 002b:00007fffaf543218 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 68.550898][ T9087] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 68.550905][ T9087] RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004 [ 68.550912][ T9087] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 68.550918][ T9087] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 68.550925][ T9087] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 68.552468][ T9087] Kernel Offset: disabled [ 69.183157][ T9087] Rebooting in 86400 seconds..