....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 38.585836] random: sshd: uninitialized urandom read (32 bytes read) [ 38.952140] kauditd_printk_skb: 7 callbacks suppressed [ 38.952150] audit: type=1400 audit(1556161270.574:35): avc: denied { map } for pid=7359 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 [ 39.012303] random: sshd: uninitialized urandom read (32 bytes read) [ 39.640254] random: sshd: uninitialized urandom read (32 bytes read) [ 39.844436] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.207' (ECDSA) to the list of known hosts. [ 45.513387] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 45.641210] audit: type=1400 audit(1556161277.264:36): avc: denied { map } for pid=7373 comm="syz-executor476" path="/root/syz-executor476934038" dev="sda1" ino=16483 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 46.784191] kobject_add_internal failed for hci2 (error: -2 parent: bluetooth) [ 46.812731] Bluetooth: Can't register HCI device executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.166853] kobject_add_internal failed for hci6 (error: -2 parent: bluetooth) [ 47.183279] Bluetooth: Can't register HCI device executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.589658] refcount_t: underflow; use-after-free. [ 47.599536] ------------[ cut here ]------------ [ 47.604406] WARNING: CPU: 1 PID: 7729 at lib/refcount.c:187 refcount_sub_and_test.cold+0x18/0x22 [ 47.613355] Kernel panic - not syncing: panic_on_warn set ... [ 47.613355] [ 47.613708] kobject: 'hci3': free name [ 47.620723] CPU: 1 PID: 7729 Comm: syz-executor476 Not tainted 4.14.113 #3 [ 47.620729] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.620748] Call Trace: [ 47.620798] dump_stack+0x138/0x19c [ 47.620837] panic+0x1f2/0x438 [ 47.620847] ? add_taint.cold+0x16/0x16 [ 47.654392] ? refcount_sub_and_test.cold+0x18/0x22 [ 47.659402] ? refcount_sub_and_test.cold+0x18/0x22 [ 47.664400] __warn.cold+0x2f/0x34 [ 47.667944] ? ist_end_non_atomic+0x10/0x10 [ 47.672305] ? refcount_sub_and_test.cold+0x18/0x22 [ 47.677340] report_bug+0x216/0x254 [ 47.680960] do_error_trap+0x1bb/0x310 [ 47.684838] ? math_error+0x360/0x360 [ 47.688650] ? vprintk_emit+0x171/0x600 [ 47.692636] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.697638] do_invalid_op+0x1b/0x20 [ 47.701357] invalid_op+0x1b/0x40 [ 47.704795] RIP: 0010:refcount_sub_and_test.cold+0x18/0x22 [ 47.710521] RSP: 0018:ffff8880a0177a68 EFLAGS: 00010286 [ 47.715883] RAX: 0000000000000026 RBX: 0000000000000000 RCX: 0000000000000000 [ 47.723135] RDX: 0000000000000000 RSI: ffff8880835b6a00 RDI: ffffed101402ef43 [ 47.730389] RBP: ffff8880a0177a90 R08: 0000000000000026 R09: ffff8880835b6a20 [ 47.737649] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88821a9f1078 [ 47.744937] R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88821a9f0ff8 [ 47.752230] ? refcount_sub_and_test.cold+0x18/0x22 [ 47.757237] ? lock_downgrade+0x6e0/0x6e0 [ 47.761369] refcount_dec_and_test+0x1b/0x20 [ 47.765762] kobject_put+0x60/0x80 [ 47.769286] kobj_kset_leave+0x17f/0x220 [ 47.773346] kobject_del.part.0+0x79/0xf0 [ 47.777488] kobject_del+0x20/0x30 [ 47.781049] cleanup_glue_dir.part.0+0xd2/0x100 [ 47.785714] device_del+0x78e/0xaa0 [ 47.789342] ? __device_links_no_driver+0x220/0x220 [ 47.794399] ? vhci_close_dev+0x50/0x50 [ 47.798468] hci_unregister_dev+0x298/0x7d0 [ 47.802776] ? vhci_close_dev+0x50/0x50 [ 47.806731] vhci_release+0x76/0xf0 [ 47.810396] __fput+0x277/0x7a0 [ 47.813686] ____fput+0x16/0x20 [ 47.816977] task_work_run+0x119/0x190 [ 47.820863] do_exit+0x7df/0x2c10 [ 47.824303] ? mm_update_next_owner+0x5d0/0x5d0 [ 47.828968] ? up_read+0x1a/0x40 [ 47.832339] ? __do_page_fault+0x358/0xb80 [ 47.836567] do_group_exit+0x111/0x330 [ 47.840448] SyS_exit_group+0x1d/0x20 [ 47.844252] ? do_group_exit+0x330/0x330 [ 47.848306] do_syscall_64+0x1eb/0x630 [ 47.852218] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 47.857048] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 47.862222] RIP: 0033:0x43fed8 [ 47.865392] RSP: 002b:00007ffd3b0ea108 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 47.873085] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043fed8 [ 47.880711] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 47.887963] RBP: 00000000004bf710 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 47.895215] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000001 [ 47.902471] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 47.910700] Kernel Offset: disabled [ 47.914405] Rebooting in 86400 seconds..