[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.214' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 43.667997] audit: type=1400 audit(1599487185.979:8): avc: denied { execmem } for pid=6358 comm="syz-executor722" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 43.689918] audit: type=1800 audit(1599487185.989:9): pid=6359 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15711 res=0 executing program executing program [ 43.771593] audit: type=1800 audit(1599487186.079:10): pid=6360 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15711 res=0 [ 43.794581] audit: type=1800 audit(1599487186.109:11): pid=6361 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15711 res=0 executing program executing program executing program [ 43.874959] audit: type=1800 audit(1599487186.189:12): pid=6362 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15711 res=0 [ 43.898822] audit: type=1800 audit(1599487186.209:13): pid=6363 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15711 res=0 [ 43.922475] audit: type=1800 audit(1599487186.240:14): pid=6364 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15711 res=0 executing program executing program [ 44.005509] audit: type=1800 audit(1599487186.320:15): pid=6365 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15711 res=0 [ 44.028877] audit: type=1800 audit(1599487186.340:16): pid=6366 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15711 res=0 executing program executing program [ 44.111512] audit: type=1800 audit(1599487186.430:17): pid=6367 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15711 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 48.679842] kauditd_printk_skb: 479 callbacks suppressed [ 48.679849] audit: type=1800 audit(1599487190.992:497): pid=6847 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15712 res=0 [ 48.707127] audit: type=1800 audit(1599487191.012:498): pid=6848 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15713 res=0 executing program executing program [ 48.730280] audit: type=1800 audit(1599487191.042:499): pid=6849 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15713 res=0 [ 48.754285] audit: type=1800 audit(1599487191.072:500): pid=6850 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15713 res=0 executing program executing program [ 48.777236] audit: type=1800 audit(1599487191.082:501): pid=6851 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15713 res=0 [ 48.800300] audit: type=1800 audit(1599487191.112:502): pid=6852 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15713 res=0 executing program executing program [ 48.823167] audit: type=1800 audit(1599487191.132:503): pid=6853 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15713 res=0 [ 48.845986] audit: type=1800 audit(1599487191.162:504): pid=6854 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15713 res=0 executing program executing program executing program [ 48.868865] audit: type=1800 audit(1599487191.172:505): pid=6855 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15713 res=0 [ 48.893591] audit: type=1800 audit(1599487191.212:506): pid=6856 uid=0 auid=0 ses=5 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor722" name="file0" dev="sda1" ino=15713 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 [ 51.452924] ================================================================== [ 51.460327] BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 [ 51.466985] Read of size 8 at addr ffff88809ae0b3a0 by task kworker/u4:4/1003 [ 51.474272] [ 51.475892] CPU: 0 PID: 1003 Comm: kworker/u4:4 Not tainted 4.14.196-syzkaller #0 [ 51.483498] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.492841] Workqueue: tipc_rcv tipc_recv_work [ 51.497471] Call Trace: [ 51.500065] dump_stack+0x1b2/0x283 [ 51.503671] print_address_description.cold+0x54/0x1d3 [ 51.508926] kasan_report_error.cold+0x8a/0x194 [ 51.513583] ? __lock_acquire+0x2c57/0x3f20 [ 51.517898] __asan_report_load8_noabort+0x68/0x70 [ 51.522802] ? tipc_subscrb_rcv_cb+0x280/0xa40 [ 51.527368] ? __lock_acquire+0x2c57/0x3f20 [ 51.531661] __lock_acquire+0x2c57/0x3f20 [ 51.535783] ? io_schedule_timeout+0x140/0x140 [ 51.540338] ? __wake_up_common_lock+0xcd/0x140 [ 51.545339] ? trace_hardirqs_on+0x10/0x10 [ 51.549546] ? trace_hardirqs_on+0x10/0x10 [ 51.553753] ? preempt_schedule_common+0x45/0xc0 [ 51.558483] ? ___preempt_schedule+0x16/0x18 [ 51.562885] ? tipc_recvmsg+0x436/0x9d0 [ 51.566843] ? __local_bh_enable_ip+0x132/0x170 [ 51.571501] lock_acquire+0x170/0x3f0 [ 51.575292] ? tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 51.579871] _raw_spin_lock_bh+0x2f/0x40 [ 51.583905] ? tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 51.588476] tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 51.592860] tipc_receive_from_sock+0x25c/0x450 [ 51.597949] ? trace_hardirqs_on+0x10/0x10 [ 51.602169] ? lock_acquire+0x170/0x3f0 [ 51.606121] ? tipc_close_conn+0x200/0x200 [ 51.610336] tipc_recv_work+0x75/0xd0 [ 51.614118] process_one_work+0x793/0x14a0 [ 51.618343] ? work_busy+0x320/0x320 [ 51.622032] ? worker_thread+0x158/0xff0 [ 51.626069] ? _raw_spin_unlock_irq+0x24/0x80 [ 51.630540] worker_thread+0x5cc/0xff0 [ 51.634402] ? rescuer_thread+0xc80/0xc80 [ 51.638568] kthread+0x30d/0x420 [ 51.641906] ? kthread_create_on_node+0xd0/0xd0 [ 51.646561] ret_from_fork+0x24/0x30 [ 51.650246] [ 51.651848] Allocated by task 1003: [ 51.655450] kasan_kmalloc+0xeb/0x160 [ 51.659237] kmem_cache_alloc_trace+0x131/0x3d0 [ 51.663893] tipc_subscrb_connect_cb+0x40/0x150 [ 51.668575] tipc_accept_from_sock+0x25b/0x400 [ 51.673222] tipc_recv_work+0x75/0xd0 [ 51.677010] process_one_work+0x793/0x14a0 [ 51.681230] worker_thread+0x5cc/0xff0 [ 51.685091] kthread+0x30d/0x420 [ 51.688452] ret_from_fork+0x24/0x30 [ 51.692136] [ 51.693737] Freed by task 188: [ 51.696902] kasan_slab_free+0xc3/0x1a0 [ 51.700848] kfree+0xc9/0x250 [ 51.703933] tipc_subscrb_put+0x22/0x30 [ 51.707893] tipc_close_conn+0x16a/0x200 [ 51.711950] tipc_send_work+0x41e/0x520 [ 51.715913] process_one_work+0x793/0x14a0 [ 51.720133] worker_thread+0x5cc/0xff0 [ 51.724015] kthread+0x30d/0x420 [ 51.727357] ret_from_fork+0x24/0x30 [ 51.731056] [ 51.732685] The buggy address belongs to the object at ffff88809ae0b380 [ 51.732685] which belongs to the cache kmalloc-96 of size 96 [ 51.745239] The buggy address is located 32 bytes inside of [ 51.745239] 96-byte region [ffff88809ae0b380, ffff88809ae0b3e0) [ 51.756914] The buggy address belongs to the page: [ 51.761831] page:ffffea00026b82c0 count:1 mapcount:0 mapping:ffff88809ae0b000 index:0x0 [ 51.769961] flags: 0xfffe0000000100(slab) [ 51.774083] raw: 00fffe0000000100 ffff88809ae0b000 0000000000000000 0000000100000020 [ 51.781943] raw: ffffea00028ff420 ffffea00026ce920 ffff88812fe524c0 0000000000000000 [ 51.789793] page dumped because: kasan: bad access detected [ 51.795472] [ 51.797069] Memory state around the buggy address: [ 51.801984] ffff88809ae0b280: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 51.809325] ffff88809ae0b300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 51.816654] >ffff88809ae0b380: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 51.823995] ^ [ 51.828401] ffff88809ae0b400: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 51.835746] ffff88809ae0b480: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 51.843091] ================================================================== [ 51.850421] Disabling lock debugging due to kernel taint [ 51.855840] Kernel panic - not syncing: panic_on_warn set ... [ 51.855840] [ 51.863173] CPU: 0 PID: 1003 Comm: kworker/u4:4 Tainted: G B 4.14.196-syzkaller #0 [ 51.872004] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.881339] Workqueue: tipc_rcv tipc_recv_work [ 51.885889] Call Trace: [ 51.888451] dump_stack+0x1b2/0x283 [ 51.892052] panic+0x1f9/0x42d [ 51.895229] ? add_taint.cold+0x16/0x16 [ 51.899177] ? lock_downgrade+0x740/0x740 [ 51.903299] kasan_end_report+0x43/0x49 [ 51.907339] kasan_report_error.cold+0xa7/0x194 [ 51.911996] ? __lock_acquire+0x2c57/0x3f20 [ 51.916300] __asan_report_load8_noabort+0x68/0x70 [ 51.921224] ? tipc_subscrb_rcv_cb+0x280/0xa40 [ 51.925837] ? __lock_acquire+0x2c57/0x3f20 [ 51.930148] __lock_acquire+0x2c57/0x3f20 [ 51.934383] ? io_schedule_timeout+0x140/0x140 [ 51.938984] ? __wake_up_common_lock+0xcd/0x140 [ 51.943629] ? trace_hardirqs_on+0x10/0x10 [ 51.947875] ? trace_hardirqs_on+0x10/0x10 [ 51.952101] ? preempt_schedule_common+0x45/0xc0 [ 51.956875] ? ___preempt_schedule+0x16/0x18 [ 51.961261] ? tipc_recvmsg+0x436/0x9d0 [ 51.965225] ? __local_bh_enable_ip+0x132/0x170 [ 51.969871] lock_acquire+0x170/0x3f0 [ 51.973645] ? tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 51.978201] _raw_spin_lock_bh+0x2f/0x40 [ 51.982249] ? tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 51.986803] tipc_subscrb_rcv_cb+0x4d4/0xa40 [ 51.991187] tipc_receive_from_sock+0x25c/0x450 [ 51.995829] ? trace_hardirqs_on+0x10/0x10 [ 52.000037] ? lock_acquire+0x170/0x3f0 [ 52.003983] ? tipc_close_conn+0x200/0x200 [ 52.008194] tipc_recv_work+0x75/0xd0 [ 52.011968] process_one_work+0x793/0x14a0 [ 52.016181] ? work_busy+0x320/0x320 [ 52.019866] ? worker_thread+0x158/0xff0 [ 52.023913] ? _raw_spin_unlock_irq+0x24/0x80 [ 52.028380] worker_thread+0x5cc/0xff0 [ 52.032246] ? rescuer_thread+0xc80/0xc80 [ 52.036367] kthread+0x30d/0x420 [ 52.039723] ? kthread_create_on_node+0xd0/0xd0 [ 52.044366] ret_from_fork+0x24/0x30 [ 52.049442] Kernel Offset: disabled [ 52.053055] Rebooting in 86400 seconds..