[ 41.589050][ T26] audit: type=1800 audit(1556765483.483:29): pid=7856 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 41.610926][ T26] audit: type=1800 audit(1556765483.493:30): pid=7856 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.112' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 50.355271][ T26] kauditd_printk_skb: 5 callbacks suppressed [ 50.355287][ T26] audit: type=1400 audit(1556765492.253:36): avc: denied { map } for pid=8043 comm="syz-executor535" path="/root/syz-executor535396792" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 50.395972][ T8044] 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 executing program executing program executing program executing program executing program executing program [ 50.926205][ T1174] ================================================================== [ 50.934391][ T1174] BUG: KASAN: slab-out-of-bounds in bacpy+0x23/0x30 [ 50.940999][ T1174] Read of size 6 at addr ffff88809295e2bb by task kworker/u5:0/1174 [ 50.948965][ T1174] [ 50.951286][ T1174] CPU: 0 PID: 1174 Comm: kworker/u5:0 Not tainted 5.1.0-rc7+ #95 [ 50.958978][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.969024][ T1174] Workqueue: hci0 hci_rx_work [ 50.973679][ T1174] Call Trace: [ 50.976957][ T1174] dump_stack+0x172/0x1f0 [ 50.981269][ T1174] ? bacpy+0x23/0x30 [ 50.985155][ T1174] print_address_description.cold+0x7c/0x20d [ 50.991113][ T1174] ? bacpy+0x23/0x30 [ 50.994988][ T1174] ? bacpy+0x23/0x30 [ 50.998864][ T1174] kasan_report.cold+0x1b/0x40 [ 51.003610][ T1174] ? bacpy+0x23/0x30 [ 51.007489][ T1174] check_memory_region+0x123/0x190 [ 51.012622][ T1174] memcpy+0x24/0x50 [ 51.016410][ T1174] bacpy+0x23/0x30 [ 51.020117][ T1174] hci_event_packet+0x4e86/0xaabf [ 51.025140][ T1174] ? graph_lock+0x7b/0x200 [ 51.029539][ T1174] ? __lockdep_reset_lock+0x450/0x450 [ 51.034895][ T1174] ? hci_cmd_complete_evt+0xbe90/0xbe90 [ 51.040442][ T1174] ? __lock_acquire+0x2340/0x3fb0 [ 51.045456][ T1174] ? skb_dequeue+0x12e/0x180 [ 51.050040][ T1174] ? find_held_lock+0x35/0x130 [ 51.054788][ T1174] ? skb_dequeue+0x12e/0x180 [ 51.059389][ T1174] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 51.065183][ T1174] ? skb_dequeue+0x12e/0x180 [ 51.069753][ T1174] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 51.075551][ T1174] ? lockdep_hardirqs_on+0x418/0x5d0 [ 51.080821][ T1174] ? trace_hardirqs_on+0x67/0x230 [ 51.085826][ T1174] ? kasan_check_read+0x11/0x20 [ 51.090664][ T1174] hci_rx_work+0x440/0xaa0 [ 51.095061][ T1174] ? hci_rx_work+0x440/0xaa0 [ 51.099641][ T1174] process_one_work+0x98e/0x1790 [ 51.104565][ T1174] ? pwq_dec_nr_in_flight+0x320/0x320 [ 51.109925][ T1174] worker_thread+0x98/0xe40 [ 51.114421][ T1174] kthread+0x357/0x430 [ 51.118478][ T1174] ? process_one_work+0x1790/0x1790 [ 51.123687][ T1174] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 51.129923][ T1174] ret_from_fork+0x3a/0x50 [ 51.134324][ T1174] [ 51.136635][ T1174] Allocated by task 8121: [ 51.140949][ T1174] save_stack+0x45/0xd0 [ 51.145104][ T1174] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 51.150717][ T1174] kasan_kmalloc+0x9/0x10 [ 51.155042][ T1174] __kmalloc_node_track_caller+0x4e/0x70 [ 51.160743][ T1174] __kmalloc_reserve.isra.0+0x40/0xf0 [ 51.166110][ T1174] __alloc_skb+0x10b/0x5e0 [ 51.170510][ T1174] vhci_write+0xc4/0x470 [ 51.174736][ T1174] new_sync_write+0x4c7/0x760 [ 51.179392][ T1174] __vfs_write+0xe4/0x110 [ 51.183712][ T1174] vfs_write+0x20c/0x580 [ 51.187932][ T1174] ksys_write+0x14f/0x2d0 [ 51.192256][ T1174] __x64_sys_write+0x73/0xb0 [ 51.196823][ T1174] do_syscall_64+0x103/0x610 [ 51.201412][ T1174] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.207283][ T1174] [ 51.209591][ T1174] Freed by task 6670: [ 51.213559][ T1174] save_stack+0x45/0xd0 [ 51.217709][ T1174] __kasan_slab_free+0x102/0x150 [ 51.222625][ T1174] kasan_slab_free+0xe/0x10 [ 51.227108][ T1174] kfree+0xcf/0x230 [ 51.230918][ T1174] load_elf_binary+0x24d4/0x53f0 [ 51.235852][ T1174] search_binary_handler+0x17f/0x570 [ 51.241121][ T1174] __do_execve_file.isra.0+0x1394/0x23f0 [ 51.246732][ T1174] __x64_sys_execve+0x8f/0xc0 [ 51.251388][ T1174] do_syscall_64+0x103/0x610 [ 51.255960][ T1174] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.261826][ T1174] [ 51.264136][ T1174] The buggy address belongs to the object at ffff88809295e0c0 [ 51.264136][ T1174] which belongs to the cache kmalloc-512 of size 512 [ 51.278176][ T1174] The buggy address is located 507 bytes inside of [ 51.278176][ T1174] 512-byte region [ffff88809295e0c0, ffff88809295e2c0) [ 51.291435][ T1174] The buggy address belongs to the page: [ 51.297045][ T1174] page:ffffea00024a5780 count:1 mapcount:0 mapping:ffff8880aa400940 index:0x0 [ 51.305868][ T1174] flags: 0x1fffc0000000200(slab) [ 51.310801][ T1174] raw: 01fffc0000000200 ffffea0002859508 ffffea0002484388 ffff8880aa400940 [ 51.319367][ T1174] raw: 0000000000000000 ffff88809295e0c0 0000000100000006 0000000000000000 [ 51.327941][ T1174] page dumped because: kasan: bad access detected [ 51.334331][ T1174] [ 51.336637][ T1174] Memory state around the buggy address: [ 51.342324][ T1174] ffff88809295e180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 51.350368][ T1174] ffff88809295e200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 51.358413][ T1174] >ffff88809295e280: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc [ 51.366450][ T1174] ^ [ 51.372589][ T1174] ffff88809295e300: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 51.380628][ T1174] ffff88809295e380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 51.388666][ T1174] ================================================================== [ 51.396965][ T1174] Disabling lock debugging due to kernel taint [ 51.404245][ T1174] Kernel panic - not syncing: panic_on_warn set ... [ 51.410853][ T1174] CPU: 0 PID: 1174 Comm: kworker/u5:0 Tainted: G B 5.1.0-rc7+ #95 [ 51.419968][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.430012][ T1174] Workqueue: hci0 hci_rx_work [ 51.434662][ T1174] Call Trace: [ 51.437943][ T1174] dump_stack+0x172/0x1f0 [ 51.442253][ T1174] panic+0x2cb/0x65c [ 51.446138][ T1174] ? __warn_printk+0xf3/0xf3 [ 51.450705][ T1174] ? bacpy+0x23/0x30 [ 51.454580][ T1174] ? preempt_schedule+0x4b/0x60 [ 51.459411][ T1174] ? ___preempt_schedule+0x16/0x18 [ 51.464500][ T1174] ? trace_hardirqs_on+0x5e/0x230 [ 51.469509][ T1174] ? bacpy+0x23/0x30 [ 51.473390][ T1174] end_report+0x47/0x4f [ 51.477522][ T1174] ? bacpy+0x23/0x30 [ 51.481396][ T1174] kasan_report.cold+0xe/0x40 [ 51.486076][ T1174] ? bacpy+0x23/0x30 [ 51.489950][ T1174] check_memory_region+0x123/0x190 [ 51.495042][ T1174] memcpy+0x24/0x50 [ 51.498831][ T1174] bacpy+0x23/0x30 [ 51.502529][ T1174] hci_event_packet+0x4e86/0xaabf [ 51.507533][ T1174] ? graph_lock+0x7b/0x200 [ 51.511925][ T1174] ? __lockdep_reset_lock+0x450/0x450 [ 51.517275][ T1174] ? hci_cmd_complete_evt+0xbe90/0xbe90 [ 51.522797][ T1174] ? __lock_acquire+0x2340/0x3fb0 [ 51.527803][ T1174] ? skb_dequeue+0x12e/0x180 [ 51.532384][ T1174] ? find_held_lock+0x35/0x130 [ 51.537129][ T1174] ? skb_dequeue+0x12e/0x180 [ 51.541708][ T1174] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 51.547489][ T1174] ? skb_dequeue+0x12e/0x180 [ 51.552055][ T1174] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 51.557838][ T1174] ? lockdep_hardirqs_on+0x418/0x5d0 [ 51.563206][ T1174] ? trace_hardirqs_on+0x67/0x230 [ 51.568208][ T1174] ? kasan_check_read+0x11/0x20 [ 51.573041][ T1174] hci_rx_work+0x440/0xaa0 [ 51.577453][ T1174] ? hci_rx_work+0x440/0xaa0 [ 51.582045][ T1174] process_one_work+0x98e/0x1790 [ 51.586963][ T1174] ? pwq_dec_nr_in_flight+0x320/0x320 [ 51.592316][ T1174] worker_thread+0x98/0xe40 [ 51.596802][ T1174] kthread+0x357/0x430 [ 51.600860][ T1174] ? process_one_work+0x1790/0x1790 [ 51.606059][ T1174] ? kthread_cancel_delayed_work_sync+0x20/0x20 [ 51.612283][ T1174] ret_from_fork+0x3a/0x50 [ 51.617885][ T1174] Kernel Offset: disabled [ 51.622205][ T1174] Rebooting in 86400 seconds..