[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 68.853629][ T27] audit: type=1800 audit(1578464698.035:25): pid=9619 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 68.873519][ T27] audit: type=1800 audit(1578464698.035:26): pid=9619 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 68.900047][ T27] audit: type=1800 audit(1578464698.045:27): pid=9619 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 '10.128.0.201' (ECDSA) to the list of known hosts. executing program executing program executing program syzkaller login: [ 82.252361][T10105] 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 [ 82.445324][T10107] ================================================================== [ 82.453565][T10107] BUG: KASAN: slab-out-of-bounds in bacpy+0x23/0x30 [ 82.460289][T10107] Read of size 6 at addr ffff8880a6ce3e08 by task kworker/u5:1/10107 [ 82.468527][T10107] [ 82.470970][T10107] CPU: 0 PID: 10107 Comm: kworker/u5:1 Not tainted 5.5.0-rc5-next-20200107-syzkaller #0 [ 82.480729][T10107] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.490906][T10107] Workqueue: hci0 hci_rx_work [ 82.495579][T10107] Call Trace: [ 82.498872][T10107] dump_stack+0x197/0x210 [ 82.503456][T10107] ? bacpy+0x23/0x30 [ 82.507347][T10107] print_address_description.constprop.0.cold+0xd4/0x30b [ 82.514356][T10107] ? bacpy+0x23/0x30 [ 82.518250][T10107] ? bacpy+0x23/0x30 [ 82.522179][T10107] __kasan_report.cold+0x1b/0x32 [ 82.527126][T10107] ? bacpy+0x23/0x30 [ 82.531038][T10107] kasan_report+0x12/0x20 [ 82.535492][T10107] check_memory_region+0x134/0x1a0 [ 82.540604][T10107] memcpy+0x24/0x50 [ 82.544498][T10107] bacpy+0x23/0x30 [ 82.548330][T10107] hci_event_packet+0x5efc/0xa991 [ 82.553388][T10107] ? hci_cmd_complete_evt+0xc360/0xc360 [ 82.558945][T10107] ? trace_raw_output_lock+0x50/0xf0 [ 82.564244][T10107] ? skb_dequeue+0x12e/0x180 [ 82.568830][T10107] ? __kasan_check_read+0x11/0x20 [ 82.573923][T10107] ? mark_lock+0xc2/0x1220 [ 82.578362][T10107] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 82.584174][T10107] ? skb_dequeue+0x12e/0x180 [ 82.588761][T10107] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 82.594554][T10107] ? lockdep_hardirqs_on+0x421/0x5e0 [ 82.600086][T10107] ? trace_hardirqs_on+0x67/0x240 [ 82.605294][T10107] hci_rx_work+0x4b7/0xb20 [ 82.609869][T10107] ? hci_rx_work+0x4b7/0xb20 [ 82.614660][T10107] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 82.620626][T10107] ? trace_hardirqs_on+0x67/0x240 [ 82.625755][T10107] process_one_work+0x9af/0x1740 [ 82.630707][T10107] ? pwq_dec_nr_in_flight+0x320/0x320 [ 82.636229][T10107] worker_thread+0x98/0xe40 [ 82.640765][T10107] kthread+0x361/0x430 [ 82.644854][T10107] ? process_one_work+0x1740/0x1740 [ 82.650325][T10107] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 82.656206][T10107] ret_from_fork+0x24/0x30 [ 82.661255][T10107] [ 82.663732][T10107] Allocated by task 10125: [ 82.668160][T10107] save_stack+0x23/0x90 [ 82.672440][T10107] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 82.678084][T10107] kasan_kmalloc+0x9/0x10 [ 82.682447][T10107] __kmalloc_node_track_caller+0x4e/0x70 [ 82.688267][T10107] __kmalloc_reserve.isra.0+0x40/0xf0 [ 82.693775][T10107] __alloc_skb+0x10b/0x5e0 [ 82.698371][T10107] vhci_write+0xc4/0x470 [ 82.702795][T10107] new_sync_write+0x4d3/0x770 [ 82.707488][T10107] __vfs_write+0xe1/0x110 [ 82.711824][T10107] vfs_write+0x268/0x5d0 [ 82.716179][T10107] ksys_write+0x14f/0x290 [ 82.720633][T10107] __x64_sys_write+0x73/0xb0 [ 82.725233][T10107] do_syscall_64+0xfa/0x790 [ 82.730011][T10107] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 82.736197][T10107] [ 82.738527][T10107] Freed by task 8986: [ 82.742500][T10107] save_stack+0x23/0x90 [ 82.747833][T10107] __kasan_slab_free+0x102/0x150 [ 82.752770][T10107] kasan_slab_free+0xe/0x10 [ 82.757406][T10107] kfree+0x10a/0x2c0 [ 82.761479][T10107] tomoyo_supervisor+0x2fe/0xe60 [ 82.766414][T10107] tomoyo_path_permission+0x263/0x360 [ 82.771772][T10107] tomoyo_path_perm+0x318/0x430 [ 82.776620][T10107] tomoyo_inode_getattr+0x1d/0x30 [ 82.781639][T10107] security_inode_getattr+0xf2/0x150 [ 82.786904][T10107] vfs_getattr+0x25/0x70 [ 82.791134][T10107] vfs_statx_fd+0x71/0xc0 [ 82.795443][T10107] __do_sys_newfstat+0x9b/0x120 [ 82.800375][T10107] __x64_sys_newfstat+0x54/0x80 [ 82.805351][T10107] do_syscall_64+0xfa/0x790 [ 82.809843][T10107] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 82.815714][T10107] [ 82.818030][T10107] The buggy address belongs to the object at ffff8880a6ce3c00 [ 82.818030][T10107] which belongs to the cache kmalloc-512 of size 512 [ 82.832084][T10107] The buggy address is located 8 bytes to the right of [ 82.832084][T10107] 512-byte region [ffff8880a6ce3c00, ffff8880a6ce3e00) [ 82.845697][T10107] The buggy address belongs to the page: [ 82.851324][T10107] page:ffffea00029b38c0 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0 [ 82.860444][T10107] raw: 00fffe0000000200 ffffea00029fbd48 ffffea0002633fc8 ffff8880aa400a80 [ 82.869047][T10107] raw: 0000000000000000 ffff8880a6ce3000 0000000100000004 0000000000000000 [ 82.877619][T10107] page dumped because: kasan: bad access detected [ 82.884017][T10107] [ 82.886329][T10107] Memory state around the buggy address: [ 82.892060][T10107] ffff8880a6ce3d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 82.900108][T10107] ffff8880a6ce3d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 82.908351][T10107] >ffff8880a6ce3e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 82.916403][T10107] ^ [ 82.920730][T10107] ffff8880a6ce3e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 82.928867][T10107] ffff8880a6ce3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 82.936995][T10107] ================================================================== [ 82.945231][T10107] Disabling lock debugging due to kernel taint [ 82.952133][T10107] Kernel panic - not syncing: panic_on_warn set ... [ 82.958961][T10107] CPU: 0 PID: 10107 Comm: kworker/u5:1 Tainted: G B 5.5.0-rc5-next-20200107-syzkaller #0 [ 82.970073][T10107] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.980135][T10107] Workqueue: hci0 hci_rx_work [ 82.984935][T10107] Call Trace: [ 82.988228][T10107] dump_stack+0x197/0x210 [ 82.992549][T10107] panic+0x2e3/0x75c [ 82.996454][T10107] ? add_taint.cold+0x16/0x16 [ 83.001218][T10107] ? bacpy+0x23/0x30 [ 83.005093][T10107] ? preempt_schedule+0x4b/0x60 [ 83.009957][T10107] ? ___preempt_schedule+0x16/0x18 [ 83.015077][T10107] ? trace_hardirqs_on+0x5e/0x240 [ 83.020091][T10107] ? bacpy+0x23/0x30 [ 83.023973][T10107] end_report+0x47/0x4f [ 83.028222][T10107] ? bacpy+0x23/0x30 [ 83.032640][T10107] __kasan_report.cold+0xe/0x32 [ 83.037598][T10107] ? bacpy+0x23/0x30 [ 83.041474][T10107] kasan_report+0x12/0x20 [ 83.045800][T10107] check_memory_region+0x134/0x1a0 [ 83.050913][T10107] memcpy+0x24/0x50 [ 83.054717][T10107] bacpy+0x23/0x30 [ 83.058421][T10107] hci_event_packet+0x5efc/0xa991 [ 83.063430][T10107] ? hci_cmd_complete_evt+0xc360/0xc360 [ 83.068972][T10107] ? trace_raw_output_lock+0x50/0xf0 [ 83.074491][T10107] ? skb_dequeue+0x12e/0x180 [ 83.079085][T10107] ? __kasan_check_read+0x11/0x20 [ 83.084202][T10107] ? mark_lock+0xc2/0x1220 [ 83.088605][T10107] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 83.094397][T10107] ? skb_dequeue+0x12e/0x180 [ 83.098980][T10107] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 83.104783][T10107] ? lockdep_hardirqs_on+0x421/0x5e0 [ 83.110052][T10107] ? trace_hardirqs_on+0x67/0x240 [ 83.115072][T10107] hci_rx_work+0x4b7/0xb20 [ 83.119496][T10107] ? hci_rx_work+0x4b7/0xb20 [ 83.124119][T10107] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 83.130086][T10107] ? trace_hardirqs_on+0x67/0x240 [ 83.135359][T10107] process_one_work+0x9af/0x1740 [ 83.140350][T10107] ? pwq_dec_nr_in_flight+0x320/0x320 [ 83.149302][T10107] worker_thread+0x98/0xe40 [ 83.155193][T10107] kthread+0x361/0x430 [ 83.159258][T10107] ? process_one_work+0x1740/0x1740 [ 83.164461][T10107] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 83.170428][T10107] ret_from_fork+0x24/0x30 [ 83.176446][T10107] Kernel Offset: disabled [ 83.180825][T10107] Rebooting in 86400 seconds..