Warning: Permanently added '10.128.1.34' (ECDSA) to the list of known hosts. syzkaller login: [ 38.737400] audit: type=1400 audit(1596631583.814:8): avc: denied { execmem } for pid=6457 comm="syz-executor487" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 38.766168] IPVS: ftp: loaded support on port[0] = 21 [ 38.776673] IPVS: ftp: loaded support on port[0] = 21 [ 38.780799] IPVS: ftp: loaded support on port[0] = 21 [ 38.783945] IPVS: ftp: loaded support on port[0] = 21 [ 38.789388] IPVS: ftp: loaded support on port[0] = 21 [ 38.803774] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.025984] Bluetooth: hci1: command 0x0409 tx timeout [ 42.031596] Bluetooth: hci0: command 0x0409 tx timeout [ 42.105320] Bluetooth: hci5: command 0x0409 tx timeout [ 42.105325] Bluetooth: hci4: command 0x0409 tx timeout [ 42.105357] Bluetooth: hci3: command 0x0409 tx timeout [ 42.121373] Bluetooth: hci2: command 0x0409 tx timeout [ 44.104205] Bluetooth: hci0: command 0x041b tx timeout [ 44.109656] Bluetooth: hci1: command 0x041b tx timeout [ 44.184158] Bluetooth: hci5: command 0x041b tx timeout [ 44.184541] Bluetooth: hci2: command 0x041b tx timeout [ 44.190215] Bluetooth: hci4: command 0x041b tx timeout [ 44.196957] Bluetooth: hci3: command 0x041b tx timeout [ 45.021063] ================================================================== [ 45.028617] BUG: KASAN: use-after-free in sco_chan_del+0xe6/0x420 [ 45.034844] Write of size 4 at addr ffff8880a4730010 by task syz-executor487/6615 [ 45.042481] [ 45.044098] CPU: 0 PID: 6615 Comm: syz-executor487 Not tainted 4.19.137-syzkaller #0 [ 45.051953] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.061285] Call Trace: [ 45.063908] dump_stack+0x1fc/0x2fe [ 45.067523] print_address_description.cold+0x54/0x219 [ 45.072781] kasan_report_error.cold+0x8a/0x1c7 [ 45.077430] ? sco_chan_del+0xe6/0x420 [ 45.081298] kasan_report+0x8f/0x96 [ 45.084907] ? sco_chan_del+0xe6/0x420 [ 45.088777] sco_chan_del+0xe6/0x420 [ 45.092479] __sco_sock_close+0xc3/0x720 [ 45.096530] sco_sock_release+0x6b/0x3d0 [ 45.100578] __sock_release+0xcd/0x2a0 [ 45.104458] ? __sock_release+0x2a0/0x2a0 [ 45.108606] sock_close+0x15/0x20 [ 45.112051] __fput+0x2ce/0x890 [ 45.115325] task_work_run+0x148/0x1c0 [ 45.119203] do_exit+0xbb2/0x2b70 [ 45.122647] ? bt_sock_wait_state+0x418/0x540 [ 45.127124] ? mm_update_next_owner+0x650/0x650 [ 45.131786] ? get_signal+0x388/0x1f70 [ 45.135679] ? lock_downgrade+0x720/0x720 [ 45.139828] ? lock_acquire+0x170/0x3c0 [ 45.143794] do_group_exit+0x125/0x310 [ 45.147671] get_signal+0x3f2/0x1f70 [ 45.151479] do_signal+0x8f/0x1670 [ 45.155023] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 45.159614] ? sco_sock_connect+0x540/0x970 [ 45.163944] ? __local_bh_enable_ip+0x159/0x270 executing program executing program executing program [ 45.168617] ? setup_sigcontext+0x820/0x820 [ 45.172924] ? sco_sock_create+0x100/0x100 [ 45.177156] ? __ia32_sys_accept+0xb0/0xb0 [ 45.181407] ? up_read+0x17/0x110 [ 45.184865] ? __do_page_fault+0x1ca/0xde0 [ 45.189106] ? exit_to_usermode_loop+0x36/0x2a0 [ 45.193785] exit_to_usermode_loop+0x204/0x2a0 [ 45.198375] do_syscall_64+0x538/0x620 [ 45.202248] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.207430] RIP: 0033:0x446eb9 [ 45.210631] Code: Bad RIP value. [ 45.213998] RSP: 002b:00007ffd11b5d658 EFLAGS: 00000246 ORIG_RAX: 000000000000002a executing program executing program executing program executing program executing program executing program executing program [ 45.221698] RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 0000000000446eb9 [ 45.229045] RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000004 [ 45.236316] RBP: 0000000000000004 R08: 0000000000000002 R09: 00000000000100ff [ 45.243673] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 [ 45.250942] R13: 0000000000407b10 R14: 0000000000000000 R15: 0000000000000000 [ 45.258229] [ 45.259867] Allocated by task 6615: [ 45.263501] kmem_cache_alloc_trace+0x12f/0x380 [ 45.268174] hci_conn_add+0x53/0x11e0 executing program executing program executing program executing program executing program executing program [ 45.271976] hci_connect_sco+0x2fc/0x950 [ 45.276044] sco_sock_connect+0x2ff/0x970 [ 45.280198] __sys_connect+0x265/0x2c0 [ 45.284096] __x64_sys_connect+0x6f/0xb0 [ 45.288157] do_syscall_64+0xf9/0x620 [ 45.291959] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.297138] [ 45.298773] Freed by task 6631: [ 45.302317] kfree+0xcc/0x210 [ 45.305428] device_release+0x76/0x210 [ 45.309317] kobject_put+0x22d/0x350 [ 45.313030] put_device+0x1c/0x30 [ 45.316496] hci_conn_del+0x27e/0x6a0 [ 45.320297] hci_phy_link_complete_evt.isra.0+0x5a4/0x7a0 [ 45.325835] hci_event_packet+0x1973/0x858f [ 45.330158] hci_rx_work+0x46b/0xa90 [ 45.333872] process_one_work+0x864/0x1570 [ 45.338104] worker_thread+0x64c/0x1130 [ 45.342077] kthread+0x30b/0x410 [ 45.345441] ret_from_fork+0x24/0x30 [ 45.349136] [ 45.350760] The buggy address belongs to the object at ffff8880a4730000 [ 45.350760] which belongs to the cache kmalloc-4096 of size 4096 [ 45.363596] The buggy address is located 16 bytes inside of [ 45.363596] 4096-byte region [ffff8880a4730000, ffff8880a4731000) [ 45.375567] The buggy address belongs to the page: [ 45.380501] page:ffffea000291cc00 count:1 mapcount:0 mapping:ffff88812c39cdc0 index:0x0 compound_mapcount: 0 [ 45.390475] flags: 0xfffe0000008100(slab|head) [ 45.395065] raw: 00fffe0000008100 ffffea0002112008 ffffea00028fca88 ffff88812c39cdc0 [ 45.402950] raw: 0000000000000000 ffff8880a4730000 0000000100000001 0000000000000000 [ 45.410824] page dumped because: kasan: bad access detected [ 45.416530] [ 45.418152] Memory state around the buggy address: [ 45.423166] ffff8880a472ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 45.430537] ffff8880a472ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 45.438498] >ffff8880a4730000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.445845] ^ [ 45.449735] ffff8880a4730080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.457098] ffff8880a4730100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.464445] ================================================================== executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 45.471877] Disabling lock debugging due to kernel taint [ 45.487398] Kernel panic - not syncing: panic_on_warn set ... [ 45.487398] [ 45.494795] CPU: 0 PID: 6615 Comm: syz-executor487 Tainted: G B 4.19.137-syzkaller #0 [ 45.504075] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.513431] Call Trace: [ 45.516025] dump_stack+0x1fc/0x2fe [ 45.519658] panic+0x26a/0x50e executing program executing program executing program executing program executing program executing program executing program executing program [ 45.522853] ? __warn_printk+0xf3/0xf3 [ 45.526744] ? preempt_schedule_common+0x45/0xc0 [ 45.531505] ? ___preempt_schedule+0x16/0x18 [ 45.535915] ? trace_hardirqs_on+0x55/0x210 [ 45.540236] kasan_end_report+0x43/0x49 [ 45.544212] kasan_report_error.cold+0xa7/0x1c7 [ 45.548887] ? sco_chan_del+0xe6/0x420 [ 45.552772] kasan_report+0x8f/0x96 [ 45.556669] ? sco_chan_del+0xe6/0x420 [ 45.560569] sco_chan_del+0xe6/0x420 [ 45.564287] __sco_sock_close+0xc3/0x720 [ 45.568353] sco_sock_release+0x6b/0x3d0 executing program executing program executing program executing program executing program [ 45.572536] __sock_release+0xcd/0x2a0 [ 45.576435] ? __sock_release+0x2a0/0x2a0 [ 45.580593] sock_close+0x15/0x20 [ 45.584056] __fput+0x2ce/0x890 [ 45.587341] task_work_run+0x148/0x1c0 [ 45.591236] do_exit+0xbb2/0x2b70 [ 45.594693] ? bt_sock_wait_state+0x418/0x540 [ 45.599192] ? mm_update_next_owner+0x650/0x650 [ 45.603862] ? get_signal+0x388/0x1f70 [ 45.607757] ? lock_downgrade+0x720/0x720 [ 45.611902] ? lock_acquire+0x170/0x3c0 [ 45.615889] do_group_exit+0x125/0x310 [ 45.619788] get_signal+0x3f2/0x1f70 [ 45.623508] do_signal+0x8f/0x1670 [ 45.627051] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 45.631634] ? sco_sock_connect+0x540/0x970 [ 45.635967] ? __local_bh_enable_ip+0x159/0x270 [ 45.640637] ? setup_sigcontext+0x820/0x820 [ 45.644963] ? sco_sock_create+0x100/0x100 [ 45.649199] ? __ia32_sys_accept+0xb0/0xb0 [ 45.653441] ? up_read+0x17/0x110 [ 45.656897] ? __do_page_fault+0x1ca/0xde0 [ 45.661140] ? exit_to_usermode_loop+0x36/0x2a0 [ 45.665824] exit_to_usermode_loop+0x204/0x2a0 [ 45.670673] do_syscall_64+0x538/0x620 [ 45.674566] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.679762] RIP: 0033:0x446eb9 [ 45.682958] Code: Bad RIP value. [ 45.686314] RSP: 002b:00007ffd11b5d658 EFLAGS: 00000246 ORIG_RAX: 000000000000002a [ 45.694018] RAX: fffffffffffffffc RBX: 0000000000000000 RCX: 0000000000446eb9 [ 45.701283] RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000004 [ 45.708550] RBP: 0000000000000004 R08: 0000000000000002 R09: 00000000000100ff [ 45.715815] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 [ 45.723083] R13: 0000000000407b10 R14: 0000000000000000 R15: 0000000000000000 [ 45.731674] Kernel Offset: disabled [ 45.735290] Rebooting in 86400 seconds..