[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 26.112425] kauditd_printk_skb: 7 callbacks suppressed [ 26.112436] audit: type=1800 audit(1540064855.419:29): pid=5192 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 [ 26.146074] audit: type=1800 audit(1540064855.419:30): pid=5192 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 '10.128.10.5' (ECDSA) to the list of known hosts. 2018/10/20 19:48:23 parsed 1 programs 2018/10/20 19:48:24 executed programs: 0 syzkaller login: [ 75.259978] IPVS: ftp: loaded support on port[0] = 21 [ 75.507374] bridge0: port 1(bridge_slave_0) entered blocking state [ 75.514374] bridge0: port 1(bridge_slave_0) entered disabled state [ 75.522523] device bridge_slave_0 entered promiscuous mode [ 75.542296] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.548851] bridge0: port 2(bridge_slave_1) entered disabled state [ 75.555915] device bridge_slave_1 entered promiscuous mode [ 75.573458] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 75.591511] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready [ 75.641756] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 75.662719] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 75.736009] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 75.743360] team0: Port device team_slave_0 added [ 75.759943] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 75.767873] team0: Port device team_slave_1 added [ 75.784880] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 75.804199] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 75.823244] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 75.842918] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 75.987527] bridge0: port 2(bridge_slave_1) entered blocking state [ 75.993985] bridge0: port 2(bridge_slave_1) entered forwarding state [ 76.000907] bridge0: port 1(bridge_slave_0) entered blocking state [ 76.007286] bridge0: port 1(bridge_slave_0) entered forwarding state [ 76.517566] 8021q: adding VLAN 0 to HW filter on device bond0 [ 76.568688] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 76.618397] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 76.624844] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 76.631851] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 76.682734] 8021q: adding VLAN 0 to HW filter on device team0 2018/10/20 19:48:29 executed programs: 158 2018/10/20 19:48:34 executed programs: 394 2018/10/20 19:48:39 executed programs: 633 2018/10/20 19:48:44 executed programs: 877 [ 100.094276] kasan: CONFIG_KASAN_INLINE enabled [ 100.099036] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 100.106599] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 100.112836] CPU: 0 PID: 10188 Comm: syz-executor0 Not tainted 4.19.0-rc8+ #293 [ 100.120175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 100.129527] RIP: 0010:n_tty_flush_buffer+0x64/0x260 [ 100.134531] Code: 80 3c 02 00 0f 85 d0 01 00 00 49 8b 9c 24 70 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 60 22 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9c 01 00 00 48 c7 83 60 22 00 00 00 00 00 00 48 [ 100.153414] RSP: 0018:ffff8801d89df780 EFLAGS: 00010202 [ 100.158761] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 100.166022] RDX: 000000000000044c RSI: 0000000000000000 RDI: 0000000000002260 [ 100.173293] RBP: ffff8801d89df798 R08: ffff8801cb0b8bf0 R09: 0000000000000002 [ 100.180564] R10: ffff8801cb0b8bd0 R11: 2c77dc48a4aa5556 R12: ffff8801cd2ba880 [ 100.188738] R13: ffff8801cd2baab8 R14: 0000000000000000 R15: ffff8801d89df7e8 [ 100.195997] FS: 00007fabac45a700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 100.204207] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 100.210073] CR2: 000000000072c000 CR3: 00000001d9b0f000 CR4: 00000000001406f0 [ 100.217329] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 100.224579] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 100.231827] Call Trace: [ 100.234405] set_termios+0x390/0x7d0 [ 100.238103] ? n_tty_kick_worker+0x230/0x230 [ 100.242495] ? tty_perform_flush+0x80/0x80 [ 100.246722] tty_mode_ioctl+0x268/0xb40 [ 100.250686] ? mark_held_locks+0x130/0x130 [ 100.254919] ? set_termios+0x7d0/0x7d0 [ 100.258791] ? tty_kref_put.part.14+0x88/0x260 [ 100.263358] ? ___might_sleep+0x1ed/0x300 [ 100.267496] ? arch_local_save_flags+0x40/0x40 [ 100.272102] n_tty_ioctl_helper+0x54/0x3b0 [ 100.276320] n_tty_ioctl+0x54/0x360 [ 100.279929] ? ldsem_down_read+0x32/0x40 [ 100.283971] ? ldsem_down_read+0x32/0x40 [ 100.288016] tty_ioctl+0x5ad/0x1820 [ 100.291632] ? commit_echoes+0x1c0/0x1c0 [ 100.295676] ? tty_vhangup+0x30/0x30 [ 100.299373] ? rcu_bh_qs+0xc0/0xc0 [ 100.302903] ? __fget+0x4d1/0x740 [ 100.306342] ? ksys_dup3+0x680/0x680 [ 100.310046] ? __might_fault+0x12b/0x1e0 [ 100.314095] ? lock_downgrade+0x900/0x900 [ 100.318244] ? lock_release+0x970/0x970 [ 100.322203] ? arch_local_save_flags+0x40/0x40 [ 100.326778] ? tty_vhangup+0x30/0x30 [ 100.330482] do_vfs_ioctl+0x1de/0x1720 [ 100.334375] ? ioctl_preallocate+0x300/0x300 [ 100.338772] ? __fget_light+0x2e9/0x430 [ 100.342760] ? fget_raw+0x20/0x20 [ 100.346210] ? _copy_to_user+0xc8/0x110 [ 100.350187] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 100.355709] ? put_timespec64+0x10f/0x1b0 [ 100.359840] ? nsecs_to_jiffies+0x30/0x30 [ 100.363975] ? do_syscall_64+0x9a/0x820 [ 100.367945] ? do_syscall_64+0x9a/0x820 [ 100.371903] ? lockdep_hardirqs_on+0x421/0x5c0 [ 100.376493] ? security_file_ioctl+0x94/0xc0 [ 100.380889] ksys_ioctl+0xa9/0xd0 [ 100.384328] __x64_sys_ioctl+0x73/0xb0 [ 100.388200] do_syscall_64+0x1b9/0x820 [ 100.392074] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 100.397421] ? syscall_return_slowpath+0x5e0/0x5e0 [ 100.402331] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 100.407155] ? trace_hardirqs_on_caller+0x310/0x310 [ 100.412152] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 100.417165] ? prepare_exit_to_usermode+0x291/0x3b0 [ 100.422191] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 100.427050] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 100.432225] RIP: 0033:0x457569 [ 100.435403] Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 100.454321] RSP: 002b:00007fabac459c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 100.462033] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569 [ 100.469290] RDX: 0000000020000000 RSI: 0000000000005404 RDI: 0000000000000005 [ 100.476539] RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 [ 100.483789] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fabac45a6d4 [ 100.491047] R13: 00000000004c0da4 R14: 00000000004d17d0 R15: 00000000ffffffff [ 100.498304] Modules linked in: [ 100.502303] ---[ end trace 37da8fc98290cf5d ]--- [ 100.507107] RIP: 0010:n_tty_flush_buffer+0x64/0x260 [ 100.512125] Code: 80 3c 02 00 0f 85 d0 01 00 00 49 8b 9c 24 70 05 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 60 22 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9c 01 00 00 48 c7 83 60 22 00 00 00 00 00 00 48 [ 100.531067] RSP: 0018:ffff8801d89df780 EFLAGS: 00010202 [ 100.536664] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 100.543964] RDX: 000000000000044c RSI: 0000000000000000 RDI: 0000000000002260 [ 100.551346] RBP: ffff8801d89df798 R08: ffff8801cb0b8bf0 R09: 0000000000000002 [ 100.558676] R10: ffff8801cb0b8bd0 R11: 2c77dc48a4aa5556 R12: ffff8801cd2ba880 [ 100.565975] R13: ffff8801cd2baab8 R14: 0000000000000000 R15: ffff8801d89df7e8 [ 100.573235] FS: 00007fabac45a700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 100.581516] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 100.587748] CR2: 000000000072c000 CR3: 00000001d9b0f000 CR4: 00000000001406f0 [ 100.595050] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 100.602318] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 100.609605] Kernel panic - not syncing: Fatal exception [ 100.615932] Kernel Offset: disabled [ 100.619558] Rebooting in 86400 seconds..