[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 70.382992][ T27] audit: type=1800 audit(1577912263.104:25): pid=9163 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 70.403062][ T27] audit: type=1800 audit(1577912263.104:26): pid=9163 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 70.520375][ T27] audit: type=1800 audit(1577912263.244:27): pid=9163 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 '10.128.0.168' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 92.338851][ T1598] ================================================================== [ 92.347097][ T1598] BUG: KASAN: slab-out-of-bounds in bacpy+0x23/0x30 [ 92.353695][ T1598] Read of size 6 at addr ffff8880900f0a08 by task kworker/u5:0/1598 [ 92.361657][ T1598] [ 92.363976][ T1598] CPU: 0 PID: 1598 Comm: kworker/u5:0 Not tainted 5.5.0-rc4-syzkaller #0 [ 92.372369][ T1598] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 92.382426][ T1598] Workqueue: hci0 hci_rx_work [ 92.387090][ T1598] Call Trace: [ 92.390375][ T1598] dump_stack+0x197/0x210 [ 92.394720][ T1598] ? bacpy+0x23/0x30 [ 92.398623][ T1598] print_address_description.constprop.0.cold+0xd4/0x30b [ 92.405650][ T1598] ? bacpy+0x23/0x30 [ 92.409541][ T1598] ? bacpy+0x23/0x30 [ 92.413448][ T1598] __kasan_report.cold+0x1b/0x41 [ 92.418391][ T1598] ? bacpy+0x23/0x30 [ 92.422298][ T1598] kasan_report+0x12/0x20 [ 92.426616][ T1598] check_memory_region+0x134/0x1a0 [ 92.431730][ T1598] memcpy+0x24/0x50 [ 92.435540][ T1598] bacpy+0x23/0x30 [ 92.439256][ T1598] hci_event_packet+0x506d/0xa8fb [ 92.444426][ T1598] ? hci_cmd_complete_evt+0xc350/0xc350 [ 92.449970][ T1598] ? percpu_down_write+0x3c0/0x3f0 [ 92.455174][ T1598] ? skb_dequeue+0x12e/0x180 [ 92.459776][ T1598] ? __kasan_check_read+0x11/0x20 [ 92.464799][ T1598] ? mark_lock+0xc2/0x1220 [ 92.469224][ T1598] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 92.475021][ T1598] ? skb_dequeue+0x12e/0x180 [ 92.479597][ T1598] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 92.485390][ T1598] ? lockdep_hardirqs_on+0x421/0x5e0 [ 92.490682][ T1598] ? trace_hardirqs_on+0x67/0x240 [ 92.495702][ T1598] hci_rx_work+0x4b7/0xb20 [ 92.500191][ T1598] ? hci_rx_work+0x4b7/0xb20 [ 92.504941][ T1598] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 92.511562][ T1598] ? trace_hardirqs_on+0x67/0x240 [ 92.517940][ T1598] process_one_work+0x9af/0x1740 [ 92.522896][ T1598] ? pwq_dec_nr_in_flight+0x320/0x320 [ 92.528281][ T1598] ? lock_acquire+0x190/0x410 [ 92.532989][ T1598] worker_thread+0x98/0xe40 [ 92.537497][ T1598] kthread+0x361/0x430 [ 92.541569][ T1598] ? process_one_work+0x1740/0x1740 [ 92.546874][ T1598] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 92.552598][ T1598] ret_from_fork+0x24/0x30 [ 92.557001][ T1598] [ 92.559313][ T1598] Allocated by task 9324: [ 92.563624][ T1598] save_stack+0x23/0x90 [ 92.567765][ T1598] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 92.573393][ T1598] kasan_kmalloc+0x9/0x10 [ 92.577730][ T1598] __kmalloc_node_track_caller+0x4e/0x70 [ 92.583356][ T1598] __kmalloc_reserve.isra.0+0x40/0xf0 [ 92.588750][ T1598] __alloc_skb+0x10b/0x5e0 [ 92.593153][ T1598] vhci_write+0xc4/0x470 [ 92.597404][ T1598] new_sync_write+0x4d3/0x770 [ 92.602064][ T1598] __vfs_write+0xe1/0x110 [ 92.606375][ T1598] vfs_write+0x268/0x5d0 [ 92.610619][ T1598] ksys_write+0x14f/0x290 [ 92.614943][ T1598] __x64_sys_write+0x73/0xb0 [ 92.619609][ T1598] do_syscall_64+0xfa/0x790 [ 92.624099][ T1598] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 92.629970][ T1598] [ 92.632281][ T1598] Freed by task 8293: [ 92.636249][ T1598] save_stack+0x23/0x90 [ 92.640402][ T1598] __kasan_slab_free+0x102/0x150 [ 92.645337][ T1598] kasan_slab_free+0xe/0x10 [ 92.649823][ T1598] kfree+0x10a/0x2c0 [ 92.653706][ T1598] tomoyo_find_next_domain+0x76a/0x1f6c [ 92.659260][ T1598] tomoyo_bprm_check_security+0x124/0x1a0 [ 92.664963][ T1598] security_bprm_check+0x63/0xb0 [ 92.669907][ T1598] search_binary_handler+0x71/0x570 [ 92.675089][ T1598] __do_execve_file.isra.0+0x1329/0x22b0 [ 92.680732][ T1598] __x64_sys_execve+0x8f/0xc0 [ 92.685521][ T1598] do_syscall_64+0xfa/0x790 [ 92.690030][ T1598] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 92.695917][ T1598] [ 92.698247][ T1598] The buggy address belongs to the object at ffff8880900f0800 [ 92.698247][ T1598] which belongs to the cache kmalloc-512 of size 512 [ 92.712284][ T1598] The buggy address is located 8 bytes to the right of [ 92.712284][ T1598] 512-byte region [ffff8880900f0800, ffff8880900f0a00) [ 92.725886][ T1598] The buggy address belongs to the page: [ 92.731508][ T1598] page:ffffea0002403c00 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0 [ 92.740626][ T1598] raw: 00fffe0000000200 ffffea00026213c8 ffffea00028c9d48 ffff8880aa400a80 [ 92.749207][ T1598] raw: 0000000000000000 ffff8880900f0000 0000000100000004 0000000000000000 [ 92.757776][ T1598] page dumped because: kasan: bad access detected [ 92.764176][ T1598] [ 92.766485][ T1598] Memory state around the buggy address: [ 92.772098][ T1598] ffff8880900f0900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 92.780142][ T1598] ffff8880900f0980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 92.788194][ T1598] >ffff8880900f0a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 92.796244][ T1598] ^ [ 92.800569][ T1598] ffff8880900f0a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 92.808634][ T1598] ffff8880900f0b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 92.816676][ T1598] ================================================================== [ 92.824715][ T1598] Disabling lock debugging due to kernel taint [ 92.834538][ T1598] Kernel panic - not syncing: panic_on_warn set ... [ 92.841290][ T1598] CPU: 0 PID: 1598 Comm: kworker/u5:0 Tainted: G B 5.5.0-rc4-syzkaller #0 [ 92.851093][ T1598] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 92.861148][ T1598] Workqueue: hci0 hci_rx_work [ 92.865815][ T1598] Call Trace: [ 92.869095][ T1598] dump_stack+0x197/0x210 [ 92.873410][ T1598] panic+0x2e3/0x75c [ 92.877293][ T1598] ? add_taint.cold+0x16/0x16 [ 92.881945][ T1598] ? bacpy+0x23/0x30 [ 92.885815][ T1598] ? preempt_schedule+0x4b/0x60 [ 92.890660][ T1598] ? ___preempt_schedule+0x16/0x18 [ 92.895769][ T1598] ? trace_hardirqs_on+0x5e/0x240 [ 92.900780][ T1598] ? bacpy+0x23/0x30 [ 92.904649][ T1598] end_report+0x47/0x4f [ 92.908782][ T1598] ? bacpy+0x23/0x30 [ 92.912665][ T1598] __kasan_report.cold+0xe/0x41 [ 92.917492][ T1598] ? bacpy+0x23/0x30 [ 92.921363][ T1598] kasan_report+0x12/0x20 [ 92.926276][ T1598] check_memory_region+0x134/0x1a0 [ 92.931375][ T1598] memcpy+0x24/0x50 [ 92.935172][ T1598] bacpy+0x23/0x30 [ 92.938878][ T1598] hci_event_packet+0x506d/0xa8fb [ 92.943884][ T1598] ? hci_cmd_complete_evt+0xc350/0xc350 [ 92.949497][ T1598] ? percpu_down_write+0x3c0/0x3f0 [ 92.954606][ T1598] ? skb_dequeue+0x12e/0x180 [ 92.959173][ T1598] ? __kasan_check_read+0x11/0x20 [ 92.964171][ T1598] ? mark_lock+0xc2/0x1220 [ 92.968575][ T1598] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 92.974357][ T1598] ? skb_dequeue+0x12e/0x180 [ 92.978946][ T1598] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 92.984728][ T1598] ? lockdep_hardirqs_on+0x421/0x5e0 [ 92.990006][ T1598] ? trace_hardirqs_on+0x67/0x240 [ 92.995009][ T1598] hci_rx_work+0x4b7/0xb20 [ 92.999400][ T1598] ? hci_rx_work+0x4b7/0xb20 [ 93.004313][ T1598] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 93.010268][ T1598] ? trace_hardirqs_on+0x67/0x240 [ 93.015287][ T1598] process_one_work+0x9af/0x1740 [ 93.020341][ T1598] ? pwq_dec_nr_in_flight+0x320/0x320 [ 93.025736][ T1598] ? lock_acquire+0x190/0x410 [ 93.030413][ T1598] worker_thread+0x98/0xe40 [ 93.034942][ T1598] kthread+0x361/0x430 [ 93.038995][ T1598] ? process_one_work+0x1740/0x1740 [ 93.044199][ T1598] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 93.050179][ T1598] ret_from_fork+0x24/0x30 [ 93.056093][ T1598] Kernel Offset: disabled [ 93.060513][ T1598] Rebooting in 86400 seconds..