[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 33.682458] random: sshd: uninitialized urandom read (32 bytes read) [ 34.111626] kauditd_printk_skb: 9 callbacks suppressed [ 34.111633] audit: type=1400 audit(1569023188.470:35): avc: denied { map } for pid=6882 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 34.166383] random: sshd: uninitialized urandom read (32 bytes read) [ 34.674377] random: sshd: uninitialized urandom read (32 bytes read) [ 34.853895] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.71' (ECDSA) to the list of known hosts. [ 40.322898] random: sshd: uninitialized urandom read (32 bytes read) [ 40.440371] audit: type=1400 audit(1569023194.800:36): avc: denied { map } for pid=6895 comm="syz-executor580" path="/root/syz-executor580491591" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 40.700921] IPVS: ftp: loaded support on port[0] = 21 [ 41.498903] chnl_net:caif_netlink_parms(): no params data found [ 41.527239] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.534105] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.541356] device bridge_slave_0 entered promiscuous mode [ 41.548099] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.554561] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.561927] device bridge_slave_1 entered promiscuous mode [ 41.575813] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 41.584743] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 41.599596] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 41.606927] team0: Port device team_slave_0 added [ 41.612344] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 41.619309] team0: Port device team_slave_1 added [ 41.624643] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 41.632186] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 41.681818] device hsr_slave_0 entered promiscuous mode [ 41.760411] device hsr_slave_1 entered promiscuous mode [ 41.820500] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 41.827348] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 41.839872] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.846341] bridge0: port 2(bridge_slave_1) entered forwarding state [ 41.853250] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.859592] bridge0: port 1(bridge_slave_0) entered forwarding state [ 41.885314] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 41.892314] 8021q: adding VLAN 0 to HW filter on device bond0 [ 41.899801] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 41.908182] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 41.927374] bridge0: port 1(bridge_slave_0) entered disabled state [ 41.934579] bridge0: port 2(bridge_slave_1) entered disabled state [ 41.944235] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 41.950557] 8021q: adding VLAN 0 to HW filter on device team0 [ 41.958527] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 41.966253] bridge0: port 1(bridge_slave_0) entered blocking state [ 41.972607] bridge0: port 1(bridge_slave_0) entered forwarding state [ 41.981857] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 41.989508] bridge0: port 2(bridge_slave_1) entered blocking state [ 41.995894] bridge0: port 2(bridge_slave_1) entered forwarding state [ 42.009147] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 42.017960] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 42.027348] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 42.037134] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 42.047571] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 42.058150] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 42.064588] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 42.071613] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready executing program [ 42.083986] IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready [ 42.093283] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 42.190764] ================================================================== [ 42.198219] BUG: KASAN: use-after-free in tcp_init_tso_segs+0x1ae/0x200 [ 42.204993] Read of size 2 at addr ffff88808aae32f0 by task syz-executor580/6896 [ 42.212534] [ 42.214143] CPU: 1 PID: 6896 Comm: syz-executor580 Not tainted 4.14.145 #0 [ 42.221165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.230520] Call Trace: [ 42.233098] dump_stack+0x138/0x197 [ 42.236712] ? tcp_init_tso_segs+0x1ae/0x200 [ 42.241099] print_address_description.cold+0x7c/0x1dc [ 42.246362] ? tcp_init_tso_segs+0x1ae/0x200 [ 42.250749] kasan_report.cold+0xa9/0x2af [ 42.254885] __asan_report_load2_noabort+0x14/0x20 [ 42.259800] tcp_init_tso_segs+0x1ae/0x200 [ 42.264096] ? tcp_tso_segs+0x7d/0x1c0 [ 42.267960] tcp_write_xmit+0x15e/0x4960 [ 42.272005] ? tcp_v4_md5_lookup+0x23/0x30 [ 42.276217] ? tcp_established_options+0x2c5/0x420 [ 42.281123] ? tcp_current_mss+0x1dc/0x2f0 [ 42.285334] ? __alloc_skb+0x3ee/0x500 [ 42.289205] __tcp_push_pending_frames+0xa6/0x260 [ 42.294040] tcp_send_fin+0x17e/0xc40 [ 42.297828] tcp_close+0xcc8/0xfb0 [ 42.301358] ? __sock_release+0x89/0x2b0 [ 42.305417] ? ip_mc_drop_socket+0x1d6/0x230 [ 42.309813] inet_release+0xec/0x1c0 [ 42.313503] __sock_release+0xce/0x2b0 [ 42.317366] ? __sock_release+0x2b0/0x2b0 [ 42.321490] sock_close+0x1b/0x30 [ 42.324939] __fput+0x275/0x7a0 [ 42.328195] ____fput+0x16/0x20 [ 42.331466] task_work_run+0x114/0x190 [ 42.335334] do_exit+0x7df/0x2c10 [ 42.338777] ? mm_update_next_owner+0x5d0/0x5d0 [ 42.343426] ? up_read+0x1a/0x40 [ 42.346778] ? __do_page_fault+0x358/0xb80 [ 42.350989] do_group_exit+0x111/0x330 [ 42.354855] SyS_exit_group+0x1d/0x20 [ 42.358629] ? do_group_exit+0x330/0x330 [ 42.362680] do_syscall_64+0x1e8/0x640 [ 42.366544] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.371367] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 42.376533] RIP: 0033:0x440618 [ 42.379709] RSP: 002b:00007ffd69c13ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 42.387401] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000440618 [ 42.394646] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 [ 42.401892] RBP: 00000000004c6970 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 42.409142] R10: 0000000020000802 R11: 0000000000000246 R12: 0000000000000001 [ 42.416388] R13: 00000000006d95e0 R14: 0000000000000000 R15: 0000000000000000 [ 42.423639] [ 42.425243] Allocated by task 6896: [ 42.428851] save_stack_trace+0x16/0x20 [ 42.432802] save_stack+0x45/0xd0 [ 42.436229] kasan_kmalloc+0xce/0xf0 [ 42.439919] kasan_slab_alloc+0xf/0x20 [ 42.443784] kmem_cache_alloc_node+0x144/0x780 [ 42.448340] __alloc_skb+0x9c/0x500 [ 42.451944] sk_stream_alloc_skb+0xb3/0x780 [ 42.456255] tcp_sendmsg_locked+0xf61/0x3200 [ 42.460652] tcp_sendmsg+0x30/0x50 [ 42.464169] inet_sendmsg+0x122/0x500 [ 42.467943] sock_sendmsg+0xce/0x110 [ 42.471632] SYSC_sendto+0x206/0x310 [ 42.475324] SyS_sendto+0x40/0x50 [ 42.478755] do_syscall_64+0x1e8/0x640 [ 42.482621] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 42.487783] [ 42.489386] Freed by task 6896: [ 42.492644] save_stack_trace+0x16/0x20 [ 42.496596] save_stack+0x45/0xd0 [ 42.500032] kasan_slab_free+0x75/0xc0 [ 42.503898] kmem_cache_free+0x83/0x2b0 [ 42.507846] kfree_skbmem+0x8d/0x120 [ 42.511545] __kfree_skb+0x1e/0x30 [ 42.515062] tcp_remove_empty_skb.part.0+0x231/0x2e0 [ 42.520139] tcp_sendmsg_locked+0x1ced/0x3200 [ 42.524608] tcp_sendmsg+0x30/0x50 [ 42.528136] inet_sendmsg+0x122/0x500 [ 42.531912] sock_sendmsg+0xce/0x110 [ 42.535600] SYSC_sendto+0x206/0x310 [ 42.539290] SyS_sendto+0x40/0x50 [ 42.542722] do_syscall_64+0x1e8/0x640 [ 42.546585] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 42.551748] [ 42.553353] The buggy address belongs to the object at ffff88808aae32c0 [ 42.553353] which belongs to the cache skbuff_fclone_cache of size 472 [ 42.566676] The buggy address is located 48 bytes inside of [ 42.566676] 472-byte region [ffff88808aae32c0, ffff88808aae3498) [ 42.578437] The buggy address belongs to the page: [ 42.583343] page:ffffea00022ab8c0 count:1 mapcount:0 mapping:ffff88808aae3040 index:0x0 [ 42.591479] flags: 0x1fffc0000000100(slab) [ 42.595694] raw: 01fffc0000000100 ffff88808aae3040 0000000000000000 0000000100000006 [ 42.603551] raw: ffffea000213df60 ffffea000267c660 ffff88821b75f3c0 0000000000000000 [ 42.611418] page dumped because: kasan: bad access detected [ 42.617102] [ 42.618717] Memory state around the buggy address: [ 42.623623] ffff88808aae3180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.630973] ffff88808aae3200: fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc fc [ 42.638308] >ffff88808aae3280: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 42.645641] ^ [ 42.652629] ffff88808aae3300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.659962] ffff88808aae3380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.667292] ================================================================== [ 42.674624] Disabling lock debugging due to kernel taint [ 42.682003] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 42.682991] Kernel panic - not syncing: panic_on_warn set ... [ 42.682991] [ 42.695856] CPU: 0 PID: 6896 Comm: syz-executor580 Tainted: G B 4.14.145 #0 [ 42.704059] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.713437] Call Trace: [ 42.716005] dump_stack+0x138/0x197 [ 42.719610] ? tcp_init_tso_segs+0x1ae/0x200 [ 42.724001] panic+0x1f2/0x426 [ 42.727170] ? add_taint.cold+0x16/0x16 [ 42.731121] ? ___preempt_schedule+0x16/0x18 [ 42.735504] kasan_end_report+0x47/0x4f [ 42.739453] kasan_report.cold+0x130/0x2af [ 42.743671] __asan_report_load2_noabort+0x14/0x20 [ 42.748578] tcp_init_tso_segs+0x1ae/0x200 [ 42.752787] ? tcp_tso_segs+0x7d/0x1c0 [ 42.756667] tcp_write_xmit+0x15e/0x4960 [ 42.760702] ? tcp_v4_md5_lookup+0x23/0x30 [ 42.764912] ? tcp_established_options+0x2c5/0x420 [ 42.769820] ? tcp_current_mss+0x1dc/0x2f0 [ 42.774032] ? __alloc_skb+0x3ee/0x500 [ 42.777897] __tcp_push_pending_frames+0xa6/0x260 [ 42.782715] tcp_send_fin+0x17e/0xc40 [ 42.786490] tcp_close+0xcc8/0xfb0 [ 42.790009] ? __sock_release+0x89/0x2b0 [ 42.794052] ? ip_mc_drop_socket+0x1d6/0x230 [ 42.798434] inet_release+0xec/0x1c0 [ 42.802127] __sock_release+0xce/0x2b0 [ 42.805989] ? __sock_release+0x2b0/0x2b0 [ 42.810111] sock_close+0x1b/0x30 [ 42.813545] __fput+0x275/0x7a0 [ 42.816799] ____fput+0x16/0x20 [ 42.820059] task_work_run+0x114/0x190 [ 42.823929] do_exit+0x7df/0x2c10 [ 42.827356] ? mm_update_next_owner+0x5d0/0x5d0 [ 42.831997] ? up_read+0x1a/0x40 [ 42.835335] ? __do_page_fault+0x358/0xb80 [ 42.839542] do_group_exit+0x111/0x330 [ 42.843407] SyS_exit_group+0x1d/0x20 [ 42.847183] ? do_group_exit+0x330/0x330 [ 42.851220] do_syscall_64+0x1e8/0x640 [ 42.855091] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.859922] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 42.865087] RIP: 0033:0x440618 [ 42.868263] RSP: 002b:00007ffd69c13ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 42.875947] RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 0000000000440618 [ 42.883209] RDX: 0000000000000001 RSI: 000000000000003c RDI: 0000000000000001 [ 42.890455] RBP: 00000000004c6970 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 42.897699] R10: 0000000020000802 R11: 0000000000000246 R12: 0000000000000001 [ 42.904954] R13: 00000000006d95e0 R14: 0000000000000000 R15: 0000000000000000 [ 42.913441] Kernel Offset: disabled [ 42.917070] Rebooting in 86400 seconds..