[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.382183][ T26] audit: type=1800 audit(1567080176.756:25): pid=8602 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.403849][ T26] audit: type=1800 audit(1567080176.756:26): pid=8602 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.441479][ T26] audit: type=1800 audit(1567080176.756:27): pid=8602 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 '10.128.0.91' (ECDSA) to the list of known hosts. 2019/08/29 12:03:05 parsed 1 programs 2019/08/29 12:03:07 executed programs: 0 syzkaller login: [ 65.854334][ T8771] IPVS: ftp: loaded support on port[0] = 21 [ 65.916766][ T8771] chnl_net:caif_netlink_parms(): no params data found [ 65.944550][ T8771] bridge0: port 1(bridge_slave_0) entered blocking state [ 65.952122][ T8771] bridge0: port 1(bridge_slave_0) entered disabled state [ 65.960325][ T8771] device bridge_slave_0 entered promiscuous mode [ 65.968488][ T8771] bridge0: port 2(bridge_slave_1) entered blocking state [ 65.975684][ T8771] bridge0: port 2(bridge_slave_1) entered disabled state [ 65.983385][ T8771] device bridge_slave_1 entered promiscuous mode [ 66.000234][ T8771] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 66.011109][ T8771] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 66.030139][ T8771] team0: Port device team_slave_0 added [ 66.037539][ T8771] team0: Port device team_slave_1 added [ 66.113764][ T8771] device hsr_slave_0 entered promiscuous mode [ 66.151816][ T8771] device hsr_slave_1 entered promiscuous mode [ 66.230613][ T8771] bridge0: port 2(bridge_slave_1) entered blocking state [ 66.237805][ T8771] bridge0: port 2(bridge_slave_1) entered forwarding state [ 66.245681][ T8771] bridge0: port 1(bridge_slave_0) entered blocking state [ 66.252782][ T8771] bridge0: port 1(bridge_slave_0) entered forwarding state [ 66.285968][ T8771] 8021q: adding VLAN 0 to HW filter on device bond0 [ 66.297999][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 66.318226][ T3771] bridge0: port 1(bridge_slave_0) entered disabled state [ 66.327183][ T3771] bridge0: port 2(bridge_slave_1) entered disabled state [ 66.336177][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 66.347619][ T8771] 8021q: adding VLAN 0 to HW filter on device team0 [ 66.358015][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 66.366673][ T12] bridge0: port 1(bridge_slave_0) entered blocking state [ 66.373767][ T12] bridge0: port 1(bridge_slave_0) entered forwarding state [ 66.394549][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 66.403218][ T3771] bridge0: port 2(bridge_slave_1) entered blocking state [ 66.410250][ T3771] bridge0: port 2(bridge_slave_1) entered forwarding state [ 66.418668][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 66.427182][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 66.436604][ T3771] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 66.449298][ T8771] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 66.460406][ T8771] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 66.472804][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 66.481952][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 66.490236][ T12] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 66.507711][ T8771] 8021q: adding VLAN 0 to HW filter on device batadv0 2019/08/29 12:03:12 executed programs: 144 2019/08/29 12:03:17 executed programs: 316 2019/08/29 12:03:22 executed programs: 495 2019/08/29 12:03:27 executed programs: 673 [ 86.031603][ T12] ================================================================== [ 86.039886][ T12] BUG: KASAN: use-after-free in rxrpc_send_keepalive+0x8a2/0x940 [ 86.047690][ T12] Read of size 8 at addr ffff888086b01218 by task kworker/0:1/12 [ 86.055380][ T12] [ 86.058449][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.3.0-rc6-next-20190827 #74 [ 86.067056][ T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.077148][ T12] Workqueue: krxrpcd rxrpc_peer_keepalive_worker [ 86.083456][ T12] Call Trace: [ 86.086824][ T12] dump_stack+0x172/0x1f0 [ 86.091134][ T12] ? rxrpc_send_keepalive+0x8a2/0x940 [ 86.096493][ T12] print_address_description.constprop.0.cold+0xd4/0x30b [ 86.103496][ T12] ? rxrpc_send_keepalive+0x8a2/0x940 [ 86.108972][ T12] ? rxrpc_send_keepalive+0x8a2/0x940 [ 86.114611][ T12] __kasan_report.cold+0x1b/0x41 [ 86.119546][ T12] ? rxrpc_send_keepalive+0x8a2/0x940 [ 86.125367][ T12] kasan_report+0x12/0x20 [ 86.129690][ T12] __asan_report_load8_noabort+0x14/0x20 [ 86.135397][ T12] rxrpc_send_keepalive+0x8a2/0x940 [ 86.140578][ T12] ? rxrpc_reject_packets+0xab0/0xab0 [ 86.145939][ T12] ? __kasan_check_read+0x11/0x20 [ 86.150944][ T12] ? mark_lock+0xc2/0x1220 [ 86.155336][ T12] ? find_held_lock+0x35/0x130 [ 86.160881][ T12] ? mark_held_locks+0xa4/0xf0 [ 86.165642][ T12] ? _raw_spin_unlock_bh+0x31/0x40 [ 86.170740][ T12] ? __local_bh_enable_ip+0x15a/0x270 [ 86.176093][ T12] ? lockdep_hardirqs_on+0x418/0x5d0 [ 86.181540][ T12] ? rxrpc_peer_keepalive_worker+0x62e/0xd02 [ 86.187497][ T12] ? trace_hardirqs_on+0x67/0x240 [ 86.192501][ T12] ? rxrpc_peer_keepalive_worker+0x62e/0xd02 [ 86.198475][ T12] ? __local_bh_enable_ip+0x15a/0x270 [ 86.203838][ T12] rxrpc_peer_keepalive_worker+0x7be/0xd02 [ 86.209642][ T12] ? rxrpc_peer_add_rtt+0x650/0x650 [ 86.214825][ T12] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 86.220349][ T12] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 86.226304][ T12] ? trace_hardirqs_on+0x67/0x240 [ 86.231307][ T12] process_one_work+0x9af/0x1740 [ 86.236231][ T12] ? __schedule+0x776/0x17a0 [ 86.240814][ T12] ? pwq_dec_nr_in_flight+0x320/0x320 [ 86.246182][ T12] ? lock_acquire+0x190/0x410 [ 86.250844][ T12] worker_thread+0x98/0xe40 [ 86.255323][ T12] ? trace_hardirqs_on+0x67/0x240 [ 86.260331][ T12] kthread+0x361/0x430 [ 86.264390][ T12] ? process_one_work+0x1740/0x1740 [ 86.269563][ T12] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 86.275779][ T12] ret_from_fork+0x24/0x30 [ 86.280176][ T12] [ 86.282484][ T12] Allocated by task 8741: [ 86.286791][ T12] save_stack+0x23/0x90 [ 86.290928][ T12] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 86.296541][ T12] kasan_kmalloc+0x9/0x10 [ 86.300842][ T12] __kmalloc+0x163/0x770 [ 86.305059][ T12] alloc_pipe_info+0x199/0x420 [ 86.309800][ T12] create_pipe_files+0x8e/0x730 [ 86.314660][ T12] __do_pipe_flags+0x48/0x250 [ 86.319329][ T12] do_pipe2+0x84/0x160 [ 86.323373][ T12] __x64_sys_pipe2+0x54/0x80 [ 86.328030][ T12] do_syscall_64+0xfa/0x760 [ 86.332528][ T12] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.338397][ T12] [ 86.340703][ T12] Freed by task 8741: [ 86.344666][ T12] save_stack+0x23/0x90 [ 86.348800][ T12] __kasan_slab_free+0x102/0x150 [ 86.353763][ T12] kasan_slab_free+0xe/0x10 [ 86.358238][ T12] kfree+0x10a/0x2c0 [ 86.362107][ T12] free_pipe_info+0x243/0x300 [ 86.366761][ T12] put_pipe_info+0xd0/0xf0 [ 86.371166][ T12] pipe_release+0x1e6/0x280 [ 86.375647][ T12] __fput+0x2ff/0x890 [ 86.379610][ T12] ____fput+0x16/0x20 [ 86.383577][ T12] task_work_run+0x145/0x1c0 [ 86.388161][ T12] exit_to_usermode_loop+0x316/0x380 [ 86.393426][ T12] do_syscall_64+0x65f/0x760 [ 86.397997][ T12] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.403859][ T12] [ 86.406166][ T12] The buggy address belongs to the object at ffff888086b01200 [ 86.406166][ T12] which belongs to the cache kmalloc-1k of size 1024 [ 86.420207][ T12] The buggy address is located 24 bytes inside of [ 86.420207][ T12] 1024-byte region [ffff888086b01200, ffff888086b01600) [ 86.433538][ T12] The buggy address belongs to the page: [ 86.439151][ T12] page:ffffea00021ac000 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff888086b00480 compound_mapcount: 0 [ 86.451371][ T12] flags: 0x1fffc0000010200(slab|head) [ 86.456739][ T12] raw: 01fffc0000010200 ffffea00027b5588 ffffea00028e3808 ffff8880aa400c40 [ 86.465325][ T12] raw: ffff888086b00480 ffff888086b00000 0000000100000003 0000000000000000 [ 86.473981][ T12] page dumped because: kasan: bad access detected [ 86.480370][ T12] [ 86.482673][ T12] Memory state around the buggy address: [ 86.488399][ T12] ffff888086b01100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.496443][ T12] ffff888086b01180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 86.504724][ T12] >ffff888086b01200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.512850][ T12] ^ [ 86.517860][ T12] ffff888086b01280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.525898][ T12] ffff888086b01300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 86.534120][ T12] ================================================================== [ 86.542428][ T12] Disabling lock debugging due to kernel taint [ 86.552984][ T12] Kernel panic - not syncing: panic_on_warn set ... [ 86.559585][ T12] CPU: 0 PID: 12 Comm: kworker/0:1 Tainted: G B 5.3.0-rc6-next-20190827 #74 [ 86.569551][ T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.579594][ T12] Workqueue: krxrpcd rxrpc_peer_keepalive_worker [ 86.585893][ T12] Call Trace: [ 86.589196][ T12] dump_stack+0x172/0x1f0 [ 86.593511][ T12] panic+0x2dc/0x755 [ 86.597382][ T12] ? add_taint.cold+0x16/0x16 [ 86.602053][ T12] ? rxrpc_send_keepalive+0x8a2/0x940 [ 86.607398][ T12] ? preempt_schedule+0x4b/0x60 [ 86.612229][ T12] ? ___preempt_schedule+0x16/0x20 [ 86.617322][ T12] ? trace_hardirqs_on+0x5e/0x240 [ 86.622323][ T12] ? rxrpc_send_keepalive+0x8a2/0x940 [ 86.627671][ T12] end_report+0x47/0x4f [ 86.631807][ T12] ? rxrpc_send_keepalive+0x8a2/0x940 [ 86.637161][ T12] __kasan_report.cold+0xe/0x41 [ 86.642090][ T12] ? rxrpc_send_keepalive+0x8a2/0x940 [ 86.647438][ T12] kasan_report+0x12/0x20 [ 86.651828][ T12] __asan_report_load8_noabort+0x14/0x20 [ 86.657436][ T12] rxrpc_send_keepalive+0x8a2/0x940 [ 86.662608][ T12] ? rxrpc_reject_packets+0xab0/0xab0 [ 86.667953][ T12] ? __kasan_check_read+0x11/0x20 [ 86.672954][ T12] ? mark_lock+0xc2/0x1220 [ 86.677344][ T12] ? find_held_lock+0x35/0x130 [ 86.682103][ T12] ? mark_held_locks+0xa4/0xf0 [ 86.686865][ T12] ? _raw_spin_unlock_bh+0x31/0x40 [ 86.691961][ T12] ? __local_bh_enable_ip+0x15a/0x270 [ 86.697309][ T12] ? lockdep_hardirqs_on+0x418/0x5d0 [ 86.702585][ T12] ? rxrpc_peer_keepalive_worker+0x62e/0xd02 [ 86.708624][ T12] ? trace_hardirqs_on+0x67/0x240 [ 86.713647][ T12] ? rxrpc_peer_keepalive_worker+0x62e/0xd02 [ 86.719606][ T12] ? __local_bh_enable_ip+0x15a/0x270 [ 86.724969][ T12] rxrpc_peer_keepalive_worker+0x7be/0xd02 [ 86.730819][ T12] ? rxrpc_peer_add_rtt+0x650/0x650 [ 86.736004][ T12] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 86.741528][ T12] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 86.747483][ T12] ? trace_hardirqs_on+0x67/0x240 [ 86.752486][ T12] process_one_work+0x9af/0x1740 [ 86.757421][ T12] ? __schedule+0x776/0x17a0 [ 86.761990][ T12] ? pwq_dec_nr_in_flight+0x320/0x320 [ 86.767339][ T12] ? lock_acquire+0x190/0x410 [ 86.772014][ T12] worker_thread+0x98/0xe40 [ 86.776494][ T12] ? trace_hardirqs_on+0x67/0x240 [ 86.781499][ T12] kthread+0x361/0x430 [ 86.785546][ T12] ? process_one_work+0x1740/0x1740 [ 86.790718][ T12] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 86.796955][ T12] ret_from_fork+0x24/0x30 [ 86.802456][ T12] Kernel Offset: disabled [ 86.806786][ T12] Rebooting in 86400 seconds..