[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.30' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 51.236668] audit: type=1400 audit(1598647519.038:8): avc: denied { execmem } for pid=6359 comm="syz-executor313" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 51.257907] audit: type=1800 audit(1598647519.038:9): pid=6360 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 [ 51.280462] audit: type=1800 audit(1598647519.038:10): pid=6361 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 executing program executing program executing program [ 51.363756] audit: type=1800 audit(1598647519.158:11): pid=6362 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 [ 51.386935] audit: type=1800 audit(1598647519.188:12): pid=6363 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 executing program [ 51.411062] audit: type=1800 audit(1598647519.208:13): pid=6364 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 [ 51.434943] audit: type=1800 audit(1598647519.238:14): pid=6365 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 executing program executing program [ 51.531443] audit: type=1800 audit(1598647519.328:15): pid=6366 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 [ 51.554235] audit: type=1800 audit(1598647519.358:16): pid=6367 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 51.655011] audit: type=1800 audit(1598647519.448:17): pid=6368 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 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 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 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 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 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 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 [ 56.260952] kauditd_printk_skb: 339 callbacks suppressed [ 56.260959] audit: type=1800 audit(1598647524.059:357): pid=6708 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 executing program executing program [ 56.316026] audit: type=1800 audit(1598647524.119:358): pid=6709 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 [ 56.340129] audit: type=1800 audit(1598647524.139:359): pid=6710 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 executing program executing program [ 56.363219] audit: type=1800 audit(1598647524.169:360): pid=6711 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 [ 56.386638] audit: type=1800 audit(1598647524.189:361): pid=6712 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 executing program executing program [ 56.410598] audit: type=1800 audit(1598647524.209:362): pid=6713 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 [ 56.433283] audit: type=1800 audit(1598647524.229:363): pid=6714 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 executing program executing program [ 56.456144] audit: type=1800 audit(1598647524.259:364): pid=6715 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 [ 56.479330] audit: type=1800 audit(1598647524.279:365): pid=6716 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 executing program executing program [ 56.502481] audit: type=1800 audit(1598647524.299:366): pid=6717 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor313" name="file0" dev="sda1" ino=15707 res=0 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 [ 56.997405] ================================================================== [ 57.004816] BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 [ 57.011484] Read of size 8 at addr ffff8880976d87a0 by task kworker/u4:3/2050 [ 57.018746] [ 57.020352] CPU: 0 PID: 2050 Comm: kworker/u4:3 Not tainted 4.14.195-syzkaller #0 [ 57.027943] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.037283] Workqueue: tipc_rcv tipc_recv_work [ 57.041840] Call Trace: [ 57.044418] dump_stack+0x1b2/0x283 [ 57.048026] print_address_description.cold+0x54/0x1d3 [ 57.053275] kasan_report_error.cold+0x8a/0x194 [ 57.057920] ? __lock_acquire+0x2c57/0x3f20 [ 57.062216] __asan_report_load8_noabort+0x68/0x70 [ 57.067122] ? tipc_subscrb_rcv_cb+0x2d0/0xa40 [ 57.071677] ? __lock_acquire+0x2c57/0x3f20 [ 57.075972] __lock_acquire+0x2c57/0x3f20 [ 57.080116] ? io_schedule_timeout+0x140/0x140 [ 57.084678] ? __wake_up_common_lock+0xcd/0x140 [ 57.089323] ? trace_hardirqs_on+0x10/0x10 [ 57.093545] ? trace_hardirqs_on+0x10/0x10 [ 57.097777] ? cache_alloc_refill+0x1da/0x350 [ 57.102249] ? lock_acquire+0x170/0x3f0 [ 57.106197] ? lock_downgrade+0x740/0x740 [ 57.110324] ? tipc_recvmsg+0x436/0x9d0 [ 57.114273] lock_acquire+0x170/0x3f0 [ 57.118050] ? tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 57.122609] _raw_spin_lock_bh+0x2f/0x40 [ 57.126645] ? tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 57.131200] tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 57.135584] tipc_receive_from_sock+0x25c/0x450 [ 57.140226] ? trace_hardirqs_on+0x10/0x10 [ 57.144434] ? lock_acquire+0x170/0x3f0 [ 57.148384] ? tipc_close_conn+0x200/0x200 [ 57.152595] tipc_recv_work+0x75/0xd0 [ 57.156369] process_one_work+0x793/0x14a0 [ 57.160578] ? work_busy+0x320/0x320 [ 57.164266] ? worker_thread+0x158/0xff0 [ 57.168304] ? _raw_spin_unlock_irq+0x24/0x80 [ 57.172791] worker_thread+0x5cc/0xff0 [ 57.176653] ? rescuer_thread+0xc80/0xc80 [ 57.180791] kthread+0x30d/0x420 [ 57.184131] ? kthread_create_on_node+0xd0/0xd0 [ 57.188789] ret_from_fork+0x24/0x30 [ 57.192489] [ 57.194090] Allocated by task 2343: [ 57.197712] kasan_kmalloc+0xeb/0x160 [ 57.201486] kmem_cache_alloc_trace+0x131/0x3d0 [ 57.206129] tipc_subscrb_connect_cb+0x40/0x150 [ 57.210775] tipc_accept_from_sock+0x25b/0x400 [ 57.215329] tipc_recv_work+0x75/0xd0 [ 57.219104] process_one_work+0x793/0x14a0 [ 57.223312] worker_thread+0x5cc/0xff0 [ 57.227172] kthread+0x30d/0x420 [ 57.230512] ret_from_fork+0x24/0x30 [ 57.234196] [ 57.235806] Freed by task 2343: [ 57.239076] kasan_slab_free+0xc3/0x1a0 [ 57.243027] kfree+0xc9/0x250 [ 57.246122] tipc_subscrb_put+0x22/0x30 [ 57.250068] tipc_close_conn+0x16a/0x200 [ 57.254101] tipc_send_work+0x41e/0x520 [ 57.258050] process_one_work+0x793/0x14a0 [ 57.262257] worker_thread+0x5cc/0xff0 [ 57.266117] kthread+0x30d/0x420 [ 57.269457] ret_from_fork+0x24/0x30 [ 57.273139] [ 57.274742] The buggy address belongs to the object at ffff8880976d8780 [ 57.274742] which belongs to the cache kmalloc-96 of size 96 [ 57.287283] The buggy address is located 32 bytes inside of [ 57.287283] 96-byte region [ffff8880976d8780, ffff8880976d87e0) [ 57.298956] The buggy address belongs to the page: [ 57.303859] page:ffffea00025db600 count:1 mapcount:0 mapping:ffff8880976d8000 index:0x0 [ 57.311974] flags: 0xfffe0000000100(slab) [ 57.316096] raw: 00fffe0000000100 ffff8880976d8000 0000000000000000 0000000100000020 [ 57.323950] raw: ffffea0002541560 ffffea00027dc060 ffff88812fe524c0 0000000000000000 [ 57.331818] page dumped because: kasan: bad access detected [ 57.337506] [ 57.339121] Memory state around the buggy address: [ 57.344024] ffff8880976d8680: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 57.351362] ffff8880976d8700: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc [ 57.358709] >ffff8880976d8780: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 57.366038] ^ [ 57.370419] ffff8880976d8800: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 57.377751] ffff8880976d8880: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 57.385095] ================================================================== [ 57.392423] Disabling lock debugging due to kernel taint [ 57.397860] Kernel panic - not syncing: panic_on_warn set ... [ 57.397860] [ 57.405208] CPU: 0 PID: 2050 Comm: kworker/u4:3 Tainted: G B 4.14.195-syzkaller #0 [ 57.414015] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 57.423352] Workqueue: tipc_rcv tipc_recv_work [ 57.428049] Call Trace: [ 57.430626] dump_stack+0x1b2/0x283 [ 57.434245] panic+0x1f9/0x42d [ 57.437431] ? add_taint.cold+0x16/0x16 [ 57.441381] ? lock_downgrade+0x740/0x740 [ 57.445505] kasan_end_report+0x43/0x49 [ 57.449453] kasan_report_error.cold+0xa7/0x194 [ 57.454097] ? __lock_acquire+0x2c57/0x3f20 [ 57.458394] __asan_report_load8_noabort+0x68/0x70 [ 57.463316] ? tipc_subscrb_rcv_cb+0x2d0/0xa40 [ 57.467872] ? __lock_acquire+0x2c57/0x3f20 [ 57.472179] __lock_acquire+0x2c57/0x3f20 [ 57.476316] ? io_schedule_timeout+0x140/0x140 [ 57.480873] ? __wake_up_common_lock+0xcd/0x140 [ 57.485516] ? trace_hardirqs_on+0x10/0x10 [ 57.489722] ? trace_hardirqs_on+0x10/0x10 [ 57.493930] ? cache_alloc_refill+0x1da/0x350 [ 57.498400] ? lock_acquire+0x170/0x3f0 [ 57.502363] ? lock_downgrade+0x740/0x740 [ 57.506485] ? tipc_recvmsg+0x436/0x9d0 [ 57.510433] lock_acquire+0x170/0x3f0 [ 57.514220] ? tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 57.518777] _raw_spin_lock_bh+0x2f/0x40 [ 57.522813] ? tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 57.527369] tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 57.531756] tipc_receive_from_sock+0x25c/0x450 [ 57.536401] ? trace_hardirqs_on+0x10/0x10 [ 57.540608] ? lock_acquire+0x170/0x3f0 [ 57.544555] ? tipc_close_conn+0x200/0x200 [ 57.548765] tipc_recv_work+0x75/0xd0 [ 57.552541] process_one_work+0x793/0x14a0 [ 57.556757] ? work_busy+0x320/0x320 [ 57.560442] ? worker_thread+0x158/0xff0 [ 57.564488] ? _raw_spin_unlock_irq+0x24/0x80 [ 57.568958] worker_thread+0x5cc/0xff0 [ 57.572859] ? rescuer_thread+0xc80/0xc80 [ 57.576983] kthread+0x30d/0x420 [ 57.580337] ? kthread_create_on_node+0xd0/0xd0 [ 57.584981] ret_from_fork+0x24/0x30 [ 57.589955] Kernel Offset: disabled [ 57.593583] Rebooting in 86400 seconds..