[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 24.811813] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 25.253892] random: sshd: uninitialized urandom read (32 bytes read) [ 25.544803] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 [ 26.143559] random: sshd: uninitialized urandom read (32 bytes read) syzkaller login: [ 26.349440] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.212' (ECDSA) to the list of known hosts. [ 31.906958] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 32.743633] ------------[ cut here ]------------ [ 32.758791] refcount_t: increment on 0; use-after-free. [ 32.765992] WARNING: CPU: 1 PID: 5475 at lib/refcount.c:153 refcount_inc_checked+0x5d/0x70 [ 32.774915] Kernel panic - not syncing: panic_on_warn set ... [ 32.774915] [ 32.782289] CPU: 1 PID: 5475 Comm: syz-executor799 Not tainted 4.19.0-rc2+ #133 [ 32.789737] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.799098] Call Trace: [ 32.801694] dump_stack+0x1c4/0x2b4 [ 32.805337] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.810562] panic+0x238/0x4e7 [ 32.813763] ? add_taint.cold.5+0x16/0x16 [ 32.817931] ? __warn.cold.8+0x148/0x1ba [ 32.822005] ? __warn.cold.8+0x117/0x1ba [ 32.826079] ? refcount_inc_checked+0x5d/0x70 [ 32.830588] __warn.cold.8+0x163/0x1ba [ 32.834490] ? rcu_bh_qs+0xc0/0xc0 [ 32.838044] ? refcount_inc_checked+0x5d/0x70 [ 32.842554] report_bug+0x254/0x2d0 [ 32.846203] do_error_trap+0x1fc/0x4d0 [ 32.850109] ? math_error+0x3f0/0x3f0 [ 32.853920] ? vprintk_default+0x28/0x30 [ 32.858029] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.862890] ? trace_hardirqs_on_caller+0x310/0x310 [ 32.867922] ? printk+0xa7/0xcf [ 32.871221] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.876080] do_invalid_op+0x1b/0x20 [ 32.879809] invalid_op+0x14/0x20 [ 32.883271] RIP: 0010:refcount_inc_checked+0x5d/0x70 [ 32.888386] Code: 1d 43 80 91 06 31 ff 89 de e8 8f 8b ef fd 84 db 75 df e8 b6 8a ef fd 48 c7 c7 a0 81 44 88 c6 05 23 80 91 06 01 e8 03 75 b9 fd <0f> 0b eb c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 [ 32.907297] RSP: 0018:ffff8801b9c07640 EFLAGS: 00010282 [ 32.912678] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 32.919952] RDX: 0000000000000000 RSI: ffffffff8164f955 RDI: 0000000000000005 [ 32.927227] RBP: ffff8801b9c07648 R08: ffff8801c1e70680 R09: ffffed003b5e4fe8 [ 32.934511] R10: ffffed003b5e4fe8 R11: ffff8801daf27f47 R12: 0000000000000001 [ 32.941788] R13: ffff8801d8d9df20 R14: ffff8801d70bf940 R15: 0000000000000001 [ 32.949082] ? vprintk_func+0x85/0x181 [ 32.952986] kobject_get+0x66/0xc0 [ 32.956545] kobject_add_internal+0x178/0xb60 [ 32.961060] ? kobj_ns_type_registered+0x60/0x60 [ 32.965834] ? kfree_const+0x59/0x70 [ 32.969602] ? rcu_read_lock_sched_held+0x108/0x120 [ 32.974633] ? kfree+0x1fa/0x230 [ 32.978106] ? kfree_const+0x5e/0x70 [ 32.981931] kobject_add+0x13f/0x1b0 [ 32.985656] ? kset_create_and_add+0x190/0x190 [ 32.990253] ? get_device_parent.isra.27+0x29f/0x5a0 [ 32.995384] ? kmem_cache_alloc_trace+0x353/0x750 [ 33.000243] ? do_raw_spin_lock+0xc1/0x200 [ 33.004496] get_device_parent.isra.27+0x367/0x5a0 [ 33.009449] device_add+0x30d/0x17f0 [ 33.013178] ? kfree_const+0x5e/0x70 [ 33.016911] ? get_device_parent.isra.27+0x5a0/0x5a0 [ 33.022024] ? dev_set_name+0xad/0xe0 [ 33.025838] ? device_initialize+0x5f0/0x5f0 [ 33.030277] hci_register_dev+0x3e6/0xb80 [ 33.034443] ? hci_conn_params_free+0x880/0x880 [ 33.039129] ? __kasan_slab_free+0x102/0x150 [ 33.043547] ? iov_iter_advance+0x1460/0x1460 [ 33.048058] __vhci_create_device+0x2c1/0x580 [ 33.052556] vhci_write+0x2de/0x470 [ 33.056187] __vfs_write+0x6b8/0x9f0 [ 33.059962] ? kernel_read+0x120/0x120 [ 33.063844] ? apparmor_path_rmdir+0x30/0x30 [ 33.068267] ? apparmor_file_permission+0x24/0x30 [ 33.073108] ? rw_verify_area+0x118/0x360 [ 33.077248] vfs_write+0x1fc/0x560 [ 33.080777] ksys_write+0x101/0x260 [ 33.084393] ? __ia32_sys_read+0xb0/0xb0 [ 33.088443] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 33.093890] __ia32_sys_write+0x71/0xb0 [ 33.097861] do_fast_syscall_32+0x34d/0xfb2 [ 33.102171] ? do_int80_syscall_32+0x890/0x890 [ 33.106742] ? entry_SYSENTER_compat+0x68/0x7f [ 33.111311] ? trace_hardirqs_off_caller+0xbb/0x310 [ 33.116313] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.121141] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.125980] ? trace_hardirqs_on_caller+0x310/0x310 [ 33.130996] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 33.136009] ? prepare_exit_to_usermode+0x291/0x3b0 [ 33.141024] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.145861] entry_SYSENTER_compat+0x70/0x7f [ 33.150255] RIP: 0023:0xf7f3aca9 [ 33.153607] Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 0c 24 c3 8b 1c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 33.172496] RSP: 002b:00000000ff80ae8c EFLAGS: 00000246 ORIG_RAX: 0000000000000004 [ 33.180191] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000200000c0 [ 33.187443] RDX: 0000000000000002 RSI: 00000000ff80afd4 RDI: 00000000ff80afdc [ 33.194696] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 33.201948] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 33.209200] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 33.217021] Dumping ftrace buffer: [ 33.220707] (ftrace buffer empty) [ 33.225042] Kernel Offset: disabled [ 33.228667] Rebooting in 86400 seconds..