[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 60.817157][ T27] audit: type=1800 audit(1576000568.201:25): pid=8896 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 60.837099][ T27] audit: type=1800 audit(1576000568.201:26): pid=8896 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 60.877871][ T27] audit: type=1800 audit(1576000568.211:27): pid=8896 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.126' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 70.848526][ T9049] ================================================================== [ 70.848580][ T9049] BUG: KASAN: user-memory-access in insert_char+0x206/0x400 [ 70.848592][ T9049] Read of size 212 at addr 00000000ffffff3a by task syz-executor463/9049 [ 70.848596][ T9049] [ 70.848612][ T9049] CPU: 0 PID: 9049 Comm: syz-executor463 Not tainted 5.5.0-rc1-syzkaller #0 [ 70.848620][ T9049] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.848625][ T9049] Call Trace: [ 70.848646][ T9049] dump_stack+0x197/0x210 [ 70.848660][ T9049] ? insert_char+0x206/0x400 [ 70.848673][ T9049] ? insert_char+0x206/0x400 [ 70.848691][ T9049] __kasan_report.cold+0x5/0x41 [ 70.848707][ T9049] ? insert_char+0x206/0x400 [ 70.848723][ T9049] kasan_report+0x12/0x20 [ 70.848738][ T9049] check_memory_region+0x134/0x1a0 [ 70.848752][ T9049] memmove+0x24/0x50 [ 70.848768][ T9049] insert_char+0x206/0x400 [ 70.848788][ T9049] do_con_trol+0x41a6/0x61b0 [ 70.848808][ T9049] ? reset_palette+0x190/0x190 [ 70.848823][ T9049] ? __kasan_check_read+0x11/0x20 [ 70.848844][ T9049] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 70.848866][ T9049] do_con_write.part.0+0xfd9/0x1ef0 [ 70.848898][ T9049] ? do_con_trol+0x61b0/0x61b0 [ 70.848913][ T9049] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 70.848925][ T9049] ? add_wait_queue+0x112/0x170 [ 70.848938][ T9049] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 70.848959][ T9049] ? trace_hardirqs_on+0x67/0x240 [ 70.848980][ T9049] con_write+0x46/0xd0 [ 70.848998][ T9049] n_tty_write+0x40e/0x1080 [ 70.849028][ T9049] ? n_tty_read+0x1bf0/0x1bf0 [ 70.849043][ T9049] ? prepare_to_wait_exclusive+0x320/0x320 [ 70.849064][ T9049] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 70.849079][ T9049] ? _copy_from_user+0x12c/0x1a0 [ 70.849096][ T9049] tty_write+0x496/0x7f0 [ 70.849113][ T9049] ? n_tty_read+0x1bf0/0x1bf0 [ 70.849140][ T9049] __vfs_write+0x8a/0x110 [ 70.849152][ T9049] ? put_tty_driver+0x20/0x20 [ 70.849169][ T9049] vfs_write+0x268/0x5d0 [ 70.849187][ T9049] ksys_write+0x14f/0x290 [ 70.849203][ T9049] ? __ia32_sys_read+0xb0/0xb0 [ 70.849222][ T9049] ? do_syscall_64+0x26/0x790 [ 70.849236][ T9049] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.849249][ T9049] ? do_syscall_64+0x26/0x790 [ 70.849267][ T9049] __x64_sys_write+0x73/0xb0 [ 70.849282][ T9049] do_syscall_64+0xfa/0x790 [ 70.849298][ T9049] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.849309][ T9049] RIP: 0033:0x4404f9 [ 70.849323][ T9049] 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 [ 70.849330][ T9049] RSP: 002b:00007ffd81600d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 70.849343][ T9049] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 70.849352][ T9049] RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004 [ 70.849360][ T9049] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 70.849368][ T9049] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 70.849376][ T9049] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 70.849395][ T9049] ================================================================== [ 70.849400][ T9049] Disabling lock debugging due to kernel taint [ 70.849407][ T9049] Kernel panic - not syncing: panic_on_warn set ... [ 70.849421][ T9049] CPU: 0 PID: 9049 Comm: syz-executor463 Tainted: G B 5.5.0-rc1-syzkaller #0 [ 70.849427][ T9049] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.849431][ T9049] Call Trace: [ 70.849443][ T9049] dump_stack+0x197/0x210 [ 70.849459][ T9049] panic+0x2e3/0x75c [ 70.849471][ T9049] ? add_taint.cold+0x16/0x16 [ 70.849487][ T9049] ? trace_hardirqs_on+0x67/0x240 [ 70.849499][ T9049] ? trace_hardirqs_on+0x5e/0x240 [ 70.849513][ T9049] ? insert_char+0x206/0x400 [ 70.849525][ T9049] end_report+0x47/0x4f [ 70.849536][ T9049] ? insert_char+0x206/0x400 [ 70.849548][ T9049] __kasan_report.cold+0xe/0x41 [ 70.849561][ T9049] ? insert_char+0x206/0x400 [ 70.849573][ T9049] kasan_report+0x12/0x20 [ 70.849585][ T9049] check_memory_region+0x134/0x1a0 [ 70.849597][ T9049] memmove+0x24/0x50 [ 70.849610][ T9049] insert_char+0x206/0x400 [ 70.849626][ T9049] do_con_trol+0x41a6/0x61b0 [ 70.849639][ T9049] ? reset_palette+0x190/0x190 [ 70.849651][ T9049] ? __kasan_check_read+0x11/0x20 [ 70.849666][ T9049] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 70.849680][ T9049] do_con_write.part.0+0xfd9/0x1ef0 [ 70.849701][ T9049] ? do_con_trol+0x61b0/0x61b0 [ 70.849712][ T9049] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 70.849721][ T9049] ? add_wait_queue+0x112/0x170 [ 70.849731][ T9049] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 70.849744][ T9049] ? trace_hardirqs_on+0x67/0x240 [ 70.849760][ T9049] con_write+0x46/0xd0 [ 70.849773][ T9049] n_tty_write+0x40e/0x1080 [ 70.849792][ T9049] ? n_tty_read+0x1bf0/0x1bf0 [ 70.849805][ T9049] ? prepare_to_wait_exclusive+0x320/0x320 [ 70.849821][ T9049] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 70.849833][ T9049] ? _copy_from_user+0x12c/0x1a0 [ 70.849847][ T9049] tty_write+0x496/0x7f0 [ 70.849860][ T9049] ? n_tty_read+0x1bf0/0x1bf0 [ 70.849875][ T9049] __vfs_write+0x8a/0x110 [ 70.849886][ T9049] ? put_tty_driver+0x20/0x20 [ 70.849898][ T9049] vfs_write+0x268/0x5d0 [ 70.849912][ T9049] ksys_write+0x14f/0x290 [ 70.849925][ T9049] ? __ia32_sys_read+0xb0/0xb0 [ 70.849938][ T9049] ? do_syscall_64+0x26/0x790 [ 70.849951][ T9049] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.849964][ T9049] ? do_syscall_64+0x26/0x790 [ 70.849978][ T9049] __x64_sys_write+0x73/0xb0 [ 70.849991][ T9049] do_syscall_64+0xfa/0x790 [ 70.850006][ T9049] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.850015][ T9049] RIP: 0033:0x4404f9 [ 70.850027][ T9049] 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 [ 70.850034][ T9049] RSP: 002b:00007ffd81600d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 70.850052][ T9049] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 70.850060][ T9049] RDX: 0000000000000078 RSI: 0000000020000000 RDI: 0000000000000004 [ 70.850068][ T9049] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 70.850075][ T9049] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 70.850082][ T9049] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 70.851526][ T9049] Kernel Offset: disabled [ 71.481364][ T9049] Rebooting in 86400 seconds..