[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 60.196560][ T26] audit: type=1800 audit(1567600930.674:25): pid=8561 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 60.238650][ T26] audit: type=1800 audit(1567600930.674:26): pid=8561 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 60.269960][ T26] audit: type=1800 audit(1567600930.674:27): pid=8561 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 '10.128.10.46' (ECDSA) to the list of known hosts. 2019/09/04 12:57:21 parsed 1 programs 2019/09/04 12:57:22 executed programs: 0 syzkaller login: [ 972.460375][ T8728] IPVS: ftp: loaded support on port[0] = 21 [ 972.523204][ T8728] chnl_net:caif_netlink_parms(): no params data found [ 972.551161][ T8728] bridge0: port 1(bridge_slave_0) entered blocking state [ 972.558557][ T8728] bridge0: port 1(bridge_slave_0) entered disabled state [ 972.566555][ T8728] device bridge_slave_0 entered promiscuous mode [ 972.575344][ T8728] bridge0: port 2(bridge_slave_1) entered blocking state [ 972.582620][ T8728] bridge0: port 2(bridge_slave_1) entered disabled state [ 972.590954][ T8728] device bridge_slave_1 entered promiscuous mode [ 972.606872][ T8728] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 972.617856][ T8728] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 972.636700][ T8728] team0: Port device team_slave_0 added [ 972.644061][ T8728] team0: Port device team_slave_1 added [ 972.690387][ T8728] device hsr_slave_0 entered promiscuous mode [ 972.738945][ T8728] device hsr_slave_1 entered promiscuous mode [ 972.786288][ T8728] bridge0: port 2(bridge_slave_1) entered blocking state [ 972.793722][ T8728] bridge0: port 2(bridge_slave_1) entered forwarding state [ 972.801632][ T8728] bridge0: port 1(bridge_slave_0) entered blocking state [ 972.808720][ T8728] bridge0: port 1(bridge_slave_0) entered forwarding state [ 972.841557][ T8728] 8021q: adding VLAN 0 to HW filter on device bond0 [ 972.855210][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 972.875695][ T17] bridge0: port 1(bridge_slave_0) entered disabled state [ 972.884666][ T17] bridge0: port 2(bridge_slave_1) entered disabled state [ 972.893673][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 972.904678][ T8728] 8021q: adding VLAN 0 to HW filter on device team0 [ 972.914650][ T8730] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 972.923201][ T8730] bridge0: port 1(bridge_slave_0) entered blocking state [ 972.930347][ T8730] bridge0: port 1(bridge_slave_0) entered forwarding state [ 972.942032][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 972.950651][ T17] bridge0: port 2(bridge_slave_1) entered blocking state [ 972.957670][ T17] bridge0: port 2(bridge_slave_1) entered forwarding state [ 972.978361][ T8728] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 972.990208][ T8728] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 973.002883][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 973.011707][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 973.020185][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 973.028984][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 973.037231][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 973.044959][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 973.062700][ T8728] 8021q: adding VLAN 0 to HW filter on device batadv0 2019/09/04 12:57:27 executed programs: 194 2019/09/04 12:57:32 executed programs: 430 2019/09/04 12:57:37 executed programs: 663 2019/09/04 12:57:42 executed programs: 898 [ 993.028792][ T8730] ================================================================== [ 993.037169][ T8730] BUG: KASAN: use-after-free in rxrpc_send_keepalive+0x8a2/0x940 [ 993.044885][ T8730] Read of size 8 at addr ffff8880a319ad98 by task kworker/0:0/8730 [ 993.044897][ T8730] [ 993.044911][ T8730] CPU: 0 PID: 8730 Comm: kworker/0:0 Not tainted 5.3.0-rc7+ #0 [ 993.055229][ T8730] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 993.072888][ T8730] Workqueue: krxrpcd rxrpc_peer_keepalive_worker [ 993.079230][ T8730] Call Trace: [ 993.082609][ T8730] dump_stack+0x172/0x1f0 [ 993.086958][ T8730] ? rxrpc_send_keepalive+0x8a2/0x940 [ 993.092338][ T8730] print_address_description.cold+0xd4/0x306 [ 993.098301][ T8730] ? rxrpc_send_keepalive+0x8a2/0x940 [ 993.103654][ T8730] ? rxrpc_send_keepalive+0x8a2/0x940 [ 993.109018][ T8730] __kasan_report.cold+0x1b/0x36 [ 993.113950][ T8730] ? rxrpc_send_keepalive+0x8a2/0x940 [ 993.119304][ T8730] kasan_report+0x12/0x17 [ 993.123652][ T8730] __asan_report_load8_noabort+0x14/0x20 [ 993.129265][ T8730] rxrpc_send_keepalive+0x8a2/0x940 [ 993.134445][ T8730] ? rxrpc_reject_packets+0xab0/0xab0 [ 993.139793][ T8730] ? __kasan_check_read+0x11/0x20 [ 993.144806][ T8730] ? mark_lock+0xc0/0x11e0 [ 993.149199][ T8730] ? find_held_lock+0x35/0x130 [ 993.153963][ T8730] ? mark_held_locks+0xa4/0xf0 [ 993.158772][ T8730] ? _raw_spin_unlock_bh+0x31/0x40 [ 993.163862][ T8730] ? __local_bh_enable_ip+0x15a/0x270 [ 993.169221][ T8730] ? lockdep_hardirqs_on+0x418/0x5d0 [ 993.174483][ T8730] ? rxrpc_peer_keepalive_worker+0x62e/0xd02 [ 993.180445][ T8730] ? trace_hardirqs_on+0x67/0x240 [ 993.185445][ T8730] ? rxrpc_peer_keepalive_worker+0x62e/0xd02 [ 993.191405][ T8730] ? __local_bh_enable_ip+0x15a/0x270 [ 993.196754][ T8730] rxrpc_peer_keepalive_worker+0x7be/0xd02 [ 993.202551][ T8730] ? mark_held_locks+0xf0/0xf0 [ 993.207304][ T8730] ? rxrpc_peer_add_rtt+0x650/0x650 [ 993.212485][ T8730] process_one_work+0x9af/0x1740 [ 993.217406][ T8730] ? pwq_dec_nr_in_flight+0x320/0x320 [ 993.222755][ T8730] ? lock_acquire+0x190/0x410 [ 993.227415][ T8730] worker_thread+0x98/0xe40 [ 993.231896][ T8730] ? trace_hardirqs_on+0x67/0x240 [ 993.236907][ T8730] kthread+0x361/0x430 [ 993.240953][ T8730] ? process_one_work+0x1740/0x1740 [ 993.246143][ T8730] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 993.252361][ T8730] ret_from_fork+0x24/0x30 [ 993.256769][ T8730] [ 993.259090][ T8730] Allocated by task 8783: [ 993.263397][ T8730] save_stack+0x23/0x90 [ 993.267531][ T8730] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 993.273137][ T8730] kasan_kmalloc+0x9/0x10 [ 993.277444][ T8730] kmem_cache_alloc_trace+0x158/0x790 [ 993.282793][ T8730] rxrpc_lookup_local+0x562/0x1ba0 [ 993.287916][ T8730] rxrpc_sendmsg+0x379/0x5f0 [ 993.292532][ T8730] sock_sendmsg+0xd7/0x130 [ 993.296928][ T8730] ___sys_sendmsg+0x3e2/0x920 [ 993.301597][ T8730] __sys_sendmmsg+0x1bf/0x4d0 [ 993.306248][ T8730] __x64_sys_sendmmsg+0x9d/0x100 [ 993.311170][ T8730] do_syscall_64+0xfd/0x6a0 [ 993.315653][ T8730] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 993.321527][ T8730] [ 993.323845][ T8730] Freed by task 8697: [ 993.327806][ T8730] save_stack+0x23/0x90 [ 993.331937][ T8730] __kasan_slab_free+0x102/0x150 [ 993.336861][ T8730] kasan_slab_free+0xe/0x10 [ 993.341340][ T8730] kfree+0x10a/0x2c0 [ 993.345221][ T8730] rxrpc_local_rcu+0x62/0x80 [ 993.349877][ T8730] rcu_core+0x67f/0x1580 [ 993.354183][ T8730] rcu_core_si+0x9/0x10 [ 993.358313][ T8730] __do_softirq+0x262/0x98c [ 993.362793][ T8730] [ 993.365109][ T8730] The buggy address belongs to the object at ffff8880a319ad80 [ 993.365109][ T8730] which belongs to the cache kmalloc-1k of size 1024 [ 993.379136][ T8730] The buggy address is located 24 bytes inside of [ 993.379136][ T8730] 1024-byte region [ffff8880a319ad80, ffff8880a319b180) [ 993.392573][ T8730] The buggy address belongs to the page: [ 993.398201][ T8730] page:ffffea00028c6680 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff8880a319ad80 compound_mapcount: 0 [ 993.410416][ T8730] flags: 0x1fffc0000010200(slab|head) [ 993.415775][ T8730] raw: 01fffc0000010200 ffffea0002303308 ffffea00024a3788 ffff8880aa400c40 [ 993.424338][ T8730] raw: ffff8880a319ad80 ffff8880a319a000 0000000100000004 0000000000000000 [ 993.432939][ T8730] page dumped because: kasan: bad access detected [ 993.439324][ T8730] [ 993.441640][ T8730] Memory state around the buggy address: [ 993.447247][ T8730] ffff8880a319ac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 993.455295][ T8730] ffff8880a319ad00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 993.463348][ T8730] >ffff8880a319ad80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 993.471397][ T8730] ^ [ 993.476239][ T8730] ffff8880a319ae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 993.484280][ T8730] ffff8880a319ae80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 993.492314][ T8730] ================================================================== [ 993.500348][ T8730] Disabling lock debugging due to kernel taint [ 993.506610][ T8730] Kernel panic - not syncing: panic_on_warn set ... [ 993.513213][ T8730] CPU: 0 PID: 8730 Comm: kworker/0:0 Tainted: G B 5.3.0-rc7+ #0 [ 993.522117][ T8730] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 993.532161][ T8730] Workqueue: krxrpcd rxrpc_peer_keepalive_worker [ 993.538474][ T8730] Call Trace: [ 993.541745][ T8730] dump_stack+0x172/0x1f0 [ 993.546056][ T8730] panic+0x2dc/0x755 [ 993.549929][ T8730] ? add_taint.cold+0x16/0x16 [ 993.554589][ T8730] ? rxrpc_send_keepalive+0x8a2/0x940 [ 993.559947][ T8730] ? preempt_schedule+0x4b/0x60 [ 993.564790][ T8730] ? ___preempt_schedule+0x16/0x20 [ 993.569878][ T8730] ? trace_hardirqs_on+0x5e/0x240 [ 993.574883][ T8730] ? rxrpc_send_keepalive+0x8a2/0x940 [ 993.580239][ T8730] end_report+0x47/0x4f [ 993.584369][ T8730] ? rxrpc_send_keepalive+0x8a2/0x940 [ 993.589717][ T8730] __kasan_report.cold+0xe/0x36 [ 993.594543][ T8730] ? rxrpc_send_keepalive+0x8a2/0x940 [ 993.599889][ T8730] kasan_report+0x12/0x17 [ 993.604198][ T8730] __asan_report_load8_noabort+0x14/0x20 [ 993.609823][ T8730] rxrpc_send_keepalive+0x8a2/0x940 [ 993.614996][ T8730] ? rxrpc_reject_packets+0xab0/0xab0 [ 993.620362][ T8730] ? __kasan_check_read+0x11/0x20 [ 993.625369][ T8730] ? mark_lock+0xc0/0x11e0 [ 993.629763][ T8730] ? find_held_lock+0x35/0x130 [ 993.634509][ T8730] ? mark_held_locks+0xa4/0xf0 [ 993.639250][ T8730] ? _raw_spin_unlock_bh+0x31/0x40 [ 993.644338][ T8730] ? __local_bh_enable_ip+0x15a/0x270 [ 993.649683][ T8730] ? lockdep_hardirqs_on+0x418/0x5d0 [ 993.654944][ T8730] ? rxrpc_peer_keepalive_worker+0x62e/0xd02 [ 993.660900][ T8730] ? trace_hardirqs_on+0x67/0x240 [ 993.665904][ T8730] ? rxrpc_peer_keepalive_worker+0x62e/0xd02 [ 993.671879][ T8730] ? __local_bh_enable_ip+0x15a/0x270 [ 993.677282][ T8730] rxrpc_peer_keepalive_worker+0x7be/0xd02 [ 993.683063][ T8730] ? mark_held_locks+0xf0/0xf0 [ 993.687802][ T8730] ? rxrpc_peer_add_rtt+0x650/0x650 [ 993.692999][ T8730] process_one_work+0x9af/0x1740 [ 993.697934][ T8730] ? pwq_dec_nr_in_flight+0x320/0x320 [ 993.703280][ T8730] ? lock_acquire+0x190/0x410 [ 993.707946][ T8730] worker_thread+0x98/0xe40 [ 993.712427][ T8730] ? trace_hardirqs_on+0x67/0x240 [ 993.717516][ T8730] kthread+0x361/0x430 [ 993.721564][ T8730] ? process_one_work+0x1740/0x1740 [ 993.726736][ T8730] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 993.732951][ T8730] ret_from_fork+0x24/0x30 [ 993.738633][ T8730] Kernel Offset: disabled [ 993.742963][ T8730] Rebooting in 86400 seconds..