[ 92.074368][ T27] audit: type=1800 audit(1581705145.907:26): pid=9647 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 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. [ 93.122087][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 93.122099][ T27] audit: type=1800 audit(1581705146.977:29): pid=9647 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 93.148528][ T27] audit: type=1800 audit(1581705146.977:30): pid=9647 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.162' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 103.304919][ T9801] ================================================================== [ 103.304976][ T9801] BUG: KASAN: null-ptr-deref in do_con_trol+0x3b9/0x61b0 [ 103.304988][ T9801] Read of size 4294967294 at addr 0000000000000012 by task syz-executor782/9801 [ 103.304992][ T9801] [ 103.305007][ T9801] CPU: 0 PID: 9801 Comm: syz-executor782 Not tainted 5.6.0-rc1-syzkaller #0 [ 103.305014][ T9801] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 103.305019][ T9801] Call Trace: [ 103.305037][ T9801] dump_stack+0x197/0x210 [ 103.305052][ T9801] ? do_con_trol+0x3b9/0x61b0 [ 103.305066][ T9801] ? do_con_trol+0x3b9/0x61b0 [ 103.305086][ T9801] __kasan_report.cold+0x5/0x32 [ 103.305106][ T9801] ? do_con_trol+0x3b9/0x61b0 [ 103.305129][ T9801] kasan_report+0x12/0x20 [ 103.305149][ T9801] check_memory_region+0x134/0x1a0 [ 103.305169][ T9801] memcpy+0x24/0x50 [ 103.305188][ T9801] do_con_trol+0x3b9/0x61b0 [ 103.305215][ T9801] ? reset_palette+0x190/0x190 [ 103.305234][ T9801] ? __kasan_check_read+0x11/0x20 [ 103.305268][ T9801] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 103.305300][ T9801] do_con_write.part.0+0xfd9/0x1ef0 [ 103.305349][ T9801] ? do_con_trol+0x61b0/0x61b0 [ 103.305364][ T9801] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 103.305376][ T9801] ? add_wait_queue+0x112/0x170 [ 103.305388][ T9801] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 103.305412][ T9801] ? trace_hardirqs_on+0x67/0x240 [ 103.305452][ T9801] con_write+0x46/0xd0 [ 103.305472][ T9801] n_tty_write+0x40e/0x1080 [ 103.305512][ T9801] ? n_tty_read+0x1bf0/0x1bf0 [ 103.305535][ T9801] ? prepare_to_wait_exclusive+0x320/0x320 [ 103.305560][ T9801] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 103.305575][ T9801] ? _copy_from_user+0x12c/0x1a0 [ 103.305596][ T9801] tty_write+0x496/0x7f0 [ 103.305619][ T9801] ? n_tty_read+0x1bf0/0x1bf0 [ 103.305646][ T9801] __vfs_write+0x8a/0x110 [ 103.305656][ T9801] ? put_tty_driver+0x20/0x20 [ 103.305678][ T9801] vfs_write+0x268/0x5d0 [ 103.305705][ T9801] ksys_write+0x14f/0x290 [ 103.305724][ T9801] ? __ia32_sys_read+0xb0/0xb0 [ 103.305744][ T9801] ? do_syscall_64+0x26/0x790 [ 103.305757][ T9801] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 103.305772][ T9801] ? do_syscall_64+0x26/0x790 [ 103.305798][ T9801] __x64_sys_write+0x73/0xb0 [ 103.305818][ T9801] do_syscall_64+0xfa/0x790 [ 103.305839][ T9801] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 103.305849][ T9801] RIP: 0033:0x4404f9 [ 103.305864][ T9801] 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 [ 103.305872][ T9801] RSP: 002b:00007ffe2edd0d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 103.305885][ T9801] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 103.305894][ T9801] RDX: 0000000000000078 RSI: 0000000020000140 RDI: 0000000000000004 [ 103.305902][ T9801] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 103.305910][ T9801] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 103.305918][ T9801] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 103.305953][ T9801] ================================================================== [ 103.305958][ T9801] Disabling lock debugging due to kernel taint [ 103.311748][ T9801] Kernel panic - not syncing: panic_on_warn set ... [ 103.311767][ T9801] CPU: 0 PID: 9801 Comm: syz-executor782 Tainted: G B 5.6.0-rc1-syzkaller #0 [ 103.311775][ T9801] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 103.311779][ T9801] Call Trace: [ 103.311800][ T9801] dump_stack+0x197/0x210 [ 103.311819][ T9801] panic+0x2e3/0x75c [ 103.311834][ T9801] ? add_taint.cold+0x16/0x16 [ 103.311850][ T9801] ? do_con_trol+0x3b9/0x61b0 [ 103.311868][ T9801] ? preempt_schedule+0x4b/0x60 [ 103.311885][ T9801] ? ___preempt_schedule+0x16/0x18 [ 103.311903][ T9801] ? trace_hardirqs_on+0x5e/0x240 [ 103.311919][ T9801] ? do_con_trol+0x3b9/0x61b0 [ 103.311936][ T9801] end_report+0x47/0x4f [ 103.311949][ T9801] ? do_con_trol+0x3b9/0x61b0 [ 103.311964][ T9801] __kasan_report.cold+0xe/0x32 [ 103.311980][ T9801] ? do_con_trol+0x3b9/0x61b0 [ 103.311995][ T9801] kasan_report+0x12/0x20 [ 103.312011][ T9801] check_memory_region+0x134/0x1a0 [ 103.312025][ T9801] memcpy+0x24/0x50 [ 103.312039][ T9801] do_con_trol+0x3b9/0x61b0 [ 103.312058][ T9801] ? reset_palette+0x190/0x190 [ 103.312075][ T9801] ? __kasan_check_read+0x11/0x20 [ 103.312104][ T9801] ? __atomic_notifier_call_chain+0xf8/0x1a0 [ 103.312124][ T9801] do_con_write.part.0+0xfd9/0x1ef0 [ 103.312153][ T9801] ? do_con_trol+0x61b0/0x61b0 [ 103.312167][ T9801] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 103.312179][ T9801] ? add_wait_queue+0x112/0x170 [ 103.312192][ T9801] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 103.312214][ T9801] ? trace_hardirqs_on+0x67/0x240 [ 103.312234][ T9801] con_write+0x46/0xd0 [ 103.312250][ T9801] n_tty_write+0x40e/0x1080 [ 103.312278][ T9801] ? n_tty_read+0x1bf0/0x1bf0 [ 103.312294][ T9801] ? prepare_to_wait_exclusive+0x320/0x320 [ 103.312315][ T9801] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 103.312329][ T9801] ? _copy_from_user+0x12c/0x1a0 [ 103.312345][ T9801] tty_write+0x496/0x7f0 [ 103.312361][ T9801] ? n_tty_read+0x1bf0/0x1bf0 [ 103.312383][ T9801] __vfs_write+0x8a/0x110 [ 103.312394][ T9801] ? put_tty_driver+0x20/0x20 [ 103.312412][ T9801] vfs_write+0x268/0x5d0 [ 103.312432][ T9801] ksys_write+0x14f/0x290 [ 103.312450][ T9801] ? __ia32_sys_read+0xb0/0xb0 [ 103.312467][ T9801] ? do_syscall_64+0x26/0x790 [ 103.312481][ T9801] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 103.312496][ T9801] ? do_syscall_64+0x26/0x790 [ 103.312515][ T9801] __x64_sys_write+0x73/0xb0 [ 103.312531][ T9801] do_syscall_64+0xfa/0x790 [ 103.312549][ T9801] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 103.312559][ T9801] RIP: 0033:0x4404f9 [ 103.312573][ T9801] 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 [ 103.312580][ T9801] RSP: 002b:00007ffe2edd0d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 103.312593][ T9801] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004404f9 [ 103.312601][ T9801] RDX: 0000000000000078 RSI: 0000000020000140 RDI: 0000000000000004 [ 103.312609][ T9801] RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 [ 103.312616][ T9801] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401de0 [ 103.312624][ T9801] R13: 0000000000401e70 R14: 0000000000000000 R15: 0000000000000000 [ 103.314156][ T9801] Kernel Offset: disabled [ 103.949680][ T9801] Rebooting in 86400 seconds..