[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 63.314481][ T25] audit: type=1800 audit(1575438028.608:25): pid=9004 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 63.334383][ T25] audit: type=1800 audit(1575438028.618:26): pid=9004 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 63.380710][ T25] audit: type=1800 audit(1575438028.618:27): pid=9004 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 '10.128.0.24' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 76.087336][ T9158] kasan: CONFIG_KASAN_INLINE enabled [ 76.087352][ T9158] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 76.087366][ T9158] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 76.087378][ T9158] CPU: 1 PID: 9158 Comm: syz-executor224 Not tainted 5.4.0-syzkaller #0 [ 76.087384][ T9158] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.087406][ T9158] RIP: 0010:do_con_write.part.0+0xa01/0x1ef0 [ 76.087419][ T9158] Code: 7e fe ff ff 45 01 ef e8 8d cc 95 fd 48 8b 85 c8 fe ff ff 80 38 00 0f 85 71 12 00 00 49 8b 9e a0 03 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 14 20 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 [ 76.087426][ T9158] RSP: 0018:ffffc90001fd76e8 EFLAGS: 00010203 [ 76.087438][ T9158] RAX: 0000000020000001 RBX: 000000010000000e RCX: ffffffff83df2da0 [ 76.087445][ T9158] RDX: 0000000000000000 RSI: ffffffff83df2df3 RDI: 0000000000000003 [ 76.087454][ T9158] RBP: ffffc90001fd7878 R08: ffff8880999985c0 R09: ffff888099998e50 [ 76.087462][ T9158] R10: fffffbfff14b0ab0 R11: ffffffff8a585587 R12: dffffc0000000000 [ 76.087470][ T9158] R13: 0000000000000000 R14: ffff888095fab000 R15: 00000000000007fe [ 76.087481][ T9158] FS: 000000000225e880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 76.087489][ T9158] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 76.087497][ T9158] CR2: 000000000043e8d0 CR3: 000000008e39a000 CR4: 00000000001406e0 [ 76.087509][ T9158] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 76.087517][ T9158] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 76.087521][ T9158] Call Trace: [ 76.087544][ T9158] ? do_con_trol+0x61b0/0x61b0 [ 76.087561][ T9158] ? n_tty_receive_buf_common+0xc3a/0x2b70 [ 76.087589][ T9158] ? do_con_write.part.0+0x1ef0/0x1ef0 [ 76.087601][ T9158] con_put_char+0xfa/0x110 [ 76.087613][ T9158] ? do_con_write.part.0+0x1ef0/0x1ef0 [ 76.087626][ T9158] ? n_tty_receive_buf_common+0xc4f/0x2b70 [ 76.087638][ T9158] ? mutex_trylock+0x2f0/0x2f0 [ 76.087656][ T9158] tty_put_char+0xc5/0x160 [ 76.087668][ T9158] ? tty_hung_up_p+0x70/0x70 [ 76.087680][ T9158] ? wait_for_completion+0x440/0x440 [ 76.087696][ T9158] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 76.087708][ T9158] ? con_write_room+0x5d/0x70 [ 76.087720][ T9158] __process_echoes+0x37c/0xa40 [ 76.087735][ T9158] n_tty_receive_buf_common+0xc77/0x2b70 [ 76.087747][ T9158] ? __might_fault+0x12b/0x1e0 [ 76.087772][ T9158] ? n_tty_receive_buf2+0x40/0x40 [ 76.087784][ T9158] n_tty_receive_buf+0x31/0x40 [ 76.087797][ T9158] tty_ioctl+0x949/0x14f0 [ 76.087809][ T9158] ? tty_vhangup+0x30/0x30 [ 76.087821][ T9158] ? tomoyo_path_number_perm+0x454/0x520 [ 76.087836][ T9158] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 76.087847][ T9158] ? tomoyo_path_number_perm+0x25e/0x520 [ 76.087860][ T9158] ? tomoyo_execute_permission+0x4a0/0x4a0 [ 76.087881][ T9158] ? tty_vhangup+0x30/0x30 [ 76.087895][ T9158] do_vfs_ioctl+0x977/0x14e0 [ 76.087910][ T9158] ? compat_ioctl_preallocate+0x220/0x220 [ 76.087923][ T9158] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.087940][ T9158] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 76.087954][ T9158] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 76.087970][ T9158] ? tomoyo_file_ioctl+0x23/0x30 [ 76.087983][ T9158] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.087998][ T9158] ? security_file_ioctl+0x8d/0xc0 [ 76.088010][ T9158] ksys_ioctl+0xab/0xd0 [ 76.088024][ T9158] __x64_sys_ioctl+0x73/0xb0 [ 76.088040][ T9158] do_syscall_64+0xfa/0x790 [ 76.088056][ T9158] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 76.088066][ T9158] RIP: 0033:0x444099 [ 76.088079][ T9158] 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 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 76.088085][ T9158] RSP: 002b:00007ffcf03cad68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 76.088097][ T9158] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444099 [ 76.088105][ T9158] RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004 [ 76.088112][ T9158] RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0 [ 76.088120][ T9158] R10: 000000000000000f R11: 0000000000000246 R12: 0000000000401da0 [ 76.088127][ T9158] R13: 0000000000401e30 R14: 0000000000000000 R15: 0000000000000000 [ 76.088137][ T9158] Modules linked in: [ 76.088153][ T9158] ---[ end trace 90093d169ab3acd7 ]--- [ 76.088165][ T9158] RIP: 0010:do_con_write.part.0+0xa01/0x1ef0 [ 76.088176][ T9158] Code: 7e fe ff ff 45 01 ef e8 8d cc 95 fd 48 8b 85 c8 fe ff ff 80 38 00 0f 85 71 12 00 00 49 8b 9e a0 03 00 00 48 89 d8 48 c1 e8 03 <42> 0f b6 14 20 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 [ 76.088183][ T9158] RSP: 0018:ffffc90001fd76e8 EFLAGS: 00010203 [ 76.088193][ T9158] RAX: 0000000020000001 RBX: 000000010000000e RCX: ffffffff83df2da0 [ 76.088200][ T9158] RDX: 0000000000000000 RSI: ffffffff83df2df3 RDI: 0000000000000003 [ 76.088208][ T9158] RBP: ffffc90001fd7878 R08: ffff8880999985c0 R09: ffff888099998e50 [ 76.088217][ T9158] R10: fffffbfff14b0ab0 R11: ffffffff8a585587 R12: dffffc0000000000 [ 76.088224][ T9158] R13: 0000000000000000 R14: ffff888095fab000 R15: 00000000000007fe [ 76.088235][ T9158] FS: 000000000225e880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 [ 76.088243][ T9158] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 76.088251][ T9158] CR2: 000000000043e8d0 CR3: 000000008e39a000 CR4: 00000000001406e0 [ 76.088260][ T9158] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 76.088268][ T9158] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 76.088275][ T9158] Kernel panic - not syncing: Fatal exception [ 76.089820][ T9158] Kernel Offset: disabled [ 76.641036][ T9158] Rebooting in 86400 seconds..