[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.409874][ T26] audit: type=1800 audit(1556765409.076:25): pid=7746 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 41.450454][ T26] audit: type=1800 audit(1556765409.086:26): pid=7746 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 41.478610][ T26] audit: type=1800 audit(1556765409.086:27): pid=7746 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 '10.128.0.102' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 51.065193][ T7899] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 51.613913][ T1502] ================================================================== [ 51.622218][ T1502] BUG: KASAN: slab-out-of-bounds in bacpy+0x23/0x30 [ 51.628793][ T1502] Read of size 6 at addr ffff888095059c3b by task kworker/u5:0/1502 [ 51.636750][ T1502] [ 51.639079][ T1502] CPU: 0 PID: 1502 Comm: kworker/u5:0 Not tainted 5.1.0-rc7-next-20190501 #34 [ 51.648276][ T1502] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.658360][ T1502] Workqueue: hci0 hci_rx_work [ 51.663022][ T1502] Call Trace: [ 51.666300][ T1502] dump_stack+0x172/0x1f0 [ 51.671393][ T1502] ? bacpy+0x23/0x30 [ 51.675282][ T1502] print_address_description.cold+0x7c/0x20d [ 51.681267][ T1502] ? bacpy+0x23/0x30 [ 51.688090][ T1502] ? bacpy+0x23/0x30 [ 51.691981][ T1502] __kasan_report.cold+0x1b/0x40 [ 51.696912][ T1502] ? bacpy+0x23/0x30 [ 51.700793][ T1502] kasan_report+0x12/0x20 [ 51.705115][ T1502] check_memory_region+0x123/0x190 [ 51.710211][ T1502] memcpy+0x24/0x50 [ 51.714007][ T1502] bacpy+0x23/0x30 [ 51.717714][ T1502] hci_event_packet+0x4e86/0xaabf [ 51.722817][ T1502] ? kasan_check_read+0x11/0x20 [ 51.727660][ T1502] ? __lock_acquire+0x27ec/0x5490 [ 51.732867][ T1502] ? stack_trace_consume_entry+0x190/0x190 [ 51.738657][ T1502] ? __lockdep_reset_lock+0x450/0x450 [ 51.744045][ T1502] ? hci_cmd_complete_evt+0xbe90/0xbe90 [ 51.749584][ T1502] ? mark_held_locks+0xf0/0xf0 [ 51.754361][ T1502] ? kasan_check_read+0x11/0x20 [ 51.759215][ T1502] ? __lock_acquire+0x27ec/0x5490 [ 51.764230][ T1502] ? skb_dequeue+0x12e/0x180 [ 51.768815][ T1502] ? find_held_lock+0x35/0x130 [ 51.773590][ T1502] ? skb_dequeue+0x12e/0x180 [ 51.778199][ T1502] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 51.784183][ T1502] ? skb_dequeue+0x12e/0x180 [ 51.788772][ T1502] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 51.794571][ T1502] ? lockdep_hardirqs_on+0x418/0x5d0 [ 51.799851][ T1502] ? trace_hardirqs_on+0x67/0x230 [ 51.804963][ T1502] ? kasan_check_read+0x11/0x20 [ 51.810072][ T1502] hci_rx_work+0x440/0xaa0 [ 51.814499][ T1502] ? hci_rx_work+0x440/0xaa0 [ 51.819097][ T1502] process_one_work+0x98e/0x1790 [ 51.824100][ T1502] ? pwq_dec_nr_in_flight+0x320/0x320 [ 51.829470][ T1502] worker_thread+0x98/0xe40 [ 51.833967][ T1502] kthread+0x357/0x430 [ 51.838054][ T1502] ? process_one_work+0x1790/0x1790 [ 51.843341][ T1502] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 51.849617][ T1502] ret_from_fork+0x3a/0x50 [ 51.854314][ T1502] [ 51.856659][ T1502] Allocated by task 7974: [ 51.860993][ T1502] save_stack+0x23/0x90 [ 51.865153][ T1502] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 51.872292][ T1502] kasan_kmalloc+0x9/0x10 [ 51.876913][ T1502] __kmalloc_node_track_caller+0x4e/0x70 [ 51.882547][ T1502] __kmalloc_reserve.isra.0+0x40/0xf0 [ 51.887925][ T1502] __alloc_skb+0x10b/0x5e0 [ 51.892424][ T1502] vhci_write+0xc4/0x470 [ 51.896686][ T1502] new_sync_write+0x4c7/0x760 [ 51.901440][ T1502] __vfs_write+0xe4/0x110 [ 51.905749][ T1502] vfs_write+0x20c/0x580 [ 51.909988][ T1502] ksys_write+0x14f/0x2d0 [ 51.914309][ T1502] __x64_sys_write+0x73/0xb0 [ 51.918882][ T1502] do_syscall_64+0x103/0x670 [ 51.923459][ T1502] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.929330][ T1502] [ 51.931648][ T1502] Freed by task 0: [ 51.935353][ T1502] (stack is not available) [ 51.939746][ T1502] [ 51.942146][ T1502] The buggy address belongs to the object at ffff888095059a40 [ 51.942146][ T1502] which belongs to the cache kmalloc-512 of size 512 [ 51.957251][ T1502] The buggy address is located 507 bytes inside of [ 51.957251][ T1502] 512-byte region [ffff888095059a40, ffff888095059c40) [ 51.970521][ T1502] The buggy address belongs to the page: [ 51.976148][ T1502] page:ffffea0002541640 count:1 mapcount:0 mapping:ffff8880aa400940 index:0x0 [ 51.991647][ T1502] flags: 0x1fffc0000000200(slab) [ 51.996603][ T1502] raw: 01fffc0000000200 ffffea0002641c48 ffff8880aa401748 ffff8880aa400940 [ 52.005362][ T1502] raw: 0000000000000000 ffff888095059040 0000000100000006 0000000000000000 [ 52.013932][ T1502] page dumped because: kasan: bad access detected [ 52.020423][ T1502] [ 52.022751][ T1502] Memory state around the buggy address: [ 52.028371][ T1502] ffff888095059b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 52.036613][ T1502] ffff888095059b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 52.044665][ T1502] >ffff888095059c00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 52.052732][ T1502] ^ [ 52.058950][ T1502] ffff888095059c80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 [ 52.067011][ T1502] ffff888095059d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 52.075157][ T1502] ================================================================== [ 52.083209][ T1502] Disabling lock debugging due to kernel taint [ 52.090049][ T1502] Kernel panic - not syncing: panic_on_warn set ... [ 52.096650][ T1502] CPU: 0 PID: 1502 Comm: kworker/u5:0 Tainted: G B 5.1.0-rc7-next-20190501 #34 [ 52.106863][ T1502] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.117001][ T1502] Workqueue: hci0 hci_rx_work [ 52.121659][ T1502] Call Trace: [ 52.124943][ T1502] dump_stack+0x172/0x1f0 [ 52.129280][ T1502] panic+0x2cb/0x75a [ 52.133182][ T1502] ? __warn_printk+0xf3/0xf3 [ 52.137869][ T1502] ? bacpy+0x23/0x30 [ 52.141749][ T1502] ? preempt_schedule+0x4b/0x60 [ 52.146586][ T1502] ? ___preempt_schedule+0x16/0x18 [ 52.151700][ T1502] ? trace_hardirqs_on+0x5e/0x230 [ 52.156716][ T1502] ? bacpy+0x23/0x30 [ 52.160615][ T1502] end_report+0x47/0x4f [ 52.164836][ T1502] ? bacpy+0x23/0x30 [ 52.168712][ T1502] __kasan_report.cold+0xe/0x40 [ 52.173583][ T1502] ? bacpy+0x23/0x30 [ 52.177482][ T1502] kasan_report+0x12/0x20 [ 52.181806][ T1502] check_memory_region+0x123/0x190 [ 52.186991][ T1502] memcpy+0x24/0x50 [ 52.190816][ T1502] bacpy+0x23/0x30 [ 52.194532][ T1502] hci_event_packet+0x4e86/0xaabf [ 52.199563][ T1502] ? kasan_check_read+0x11/0x20 [ 52.204411][ T1502] ? __lock_acquire+0x27ec/0x5490 [ 52.209438][ T1502] ? stack_trace_consume_entry+0x190/0x190 [ 52.215246][ T1502] ? __lockdep_reset_lock+0x450/0x450 [ 52.221322][ T1502] ? hci_cmd_complete_evt+0xbe90/0xbe90 [ 52.226874][ T1502] ? mark_held_locks+0xf0/0xf0 [ 52.231626][ T1502] ? kasan_check_read+0x11/0x20 [ 52.236522][ T1502] ? __lock_acquire+0x27ec/0x5490 [ 52.241626][ T1502] ? skb_dequeue+0x12e/0x180 [ 52.246304][ T1502] ? find_held_lock+0x35/0x130 [ 52.251059][ T1502] ? skb_dequeue+0x12e/0x180 [ 52.255676][ T1502] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 52.261661][ T1502] ? skb_dequeue+0x12e/0x180 [ 52.266242][ T1502] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 52.272048][ T1502] ? lockdep_hardirqs_on+0x418/0x5d0 [ 52.277322][ T1502] ? trace_hardirqs_on+0x67/0x230 [ 52.282332][ T1502] ? kasan_check_read+0x11/0x20 [ 52.287280][ T1502] hci_rx_work+0x440/0xaa0 [ 52.291686][ T1502] ? hci_rx_work+0x440/0xaa0 [ 52.296277][ T1502] process_one_work+0x98e/0x1790 [ 52.301219][ T1502] ? pwq_dec_nr_in_flight+0x320/0x320 [ 52.306691][ T1502] worker_thread+0x98/0xe40 [ 52.311191][ T1502] kthread+0x357/0x430 [ 52.315363][ T1502] ? process_one_work+0x1790/0x1790 [ 52.320636][ T1502] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 52.326885][ T1502] ret_from_fork+0x3a/0x50 [ 52.332435][ T1502] Kernel Offset: disabled [ 52.336782][ T1502] Rebooting in 86400 seconds..