[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.496268] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.530711] random: sshd: uninitialized urandom read (32 bytes read) [ 22.860681] random: sshd: uninitialized urandom read (32 bytes read) [ 23.704777] random: sshd: uninitialized urandom read (32 bytes read) [ 27.885664] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.57' (ECDSA) to the list of known hosts. [ 33.456772] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.548956] WARNING: CPU: 0 PID: 4511 at include/net/sock.h:644 smc_unhash_sk+0x357/0x4b0 [ 33.557353] Kernel panic - not syncing: panic_on_warn set ... [ 33.557353] [ 33.564702] CPU: 0 PID: 4511 Comm: syz-executor928 Not tainted 4.18.0-rc4+ #144 [ 33.572136] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.581469] Call Trace: [ 33.584048] dump_stack+0x1c9/0x2b4 [ 33.587657] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.592833] panic+0x238/0x4e7 [ 33.596012] ? add_taint.cold.5+0x16/0x16 [ 33.600153] ? __warn.cold.8+0x148/0x1ba [ 33.604196] ? __warn.cold.8+0x117/0x1ba [ 33.608240] ? smc_unhash_sk+0x357/0x4b0 [ 33.612280] __warn.cold.8+0x163/0x1ba [ 33.616147] ? smc_unhash_sk+0x357/0x4b0 [ 33.620189] report_bug+0x252/0x2d0 [ 33.623797] do_error_trap+0x1fc/0x4d0 [ 33.627666] ? math_error+0x3e0/0x3e0 [ 33.631449] ? print_usage_bug+0xc0/0xc0 [ 33.635493] ? lock_acquire+0x1e4/0x540 [ 33.639450] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.644283] do_invalid_op+0x1b/0x20 [ 33.647976] invalid_op+0x14/0x20 [ 33.651410] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 33.656056] Code: 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 88 00 00 00 48 81 c4 c0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 e9 52 1a fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 03 2d 58 fa [ 33.675231] RSP: 0018:ffff8801ce7f7480 EFLAGS: 00010293 [ 33.680575] RAX: ffff8801aefcc3c0 RBX: ffff8801aef130c0 RCX: ffffffff8761b7f6 [ 33.687823] RDX: 0000000000000000 RSI: ffffffff8761b8b7 RDI: 0000000000000005 [ 33.695070] RBP: ffff8801ce7f7568 R08: ffff8801aefcc3c0 R09: ffffed0035de2628 [ 33.702327] R10: ffffed0035de2628 R11: ffff8801aef13143 R12: 1ffff10039cfee94 [ 33.709573] R13: ffff8801ce7f7540 R14: ffffffff899372c0 R15: ffff8801aef13140 [ 33.716834] ? smc_unhash_sk+0x296/0x4b0 [ 33.720873] ? smc_unhash_sk+0x357/0x4b0 [ 33.724926] ? smc_rx_data_available+0x120/0x120 [ 33.729675] ? release_sock+0x1ec/0x2c0 [ 33.733630] ? __local_bh_enable_ip+0x161/0x230 [ 33.738290] ? __release_sock+0x3a0/0x3a0 [ 33.742421] ? smc_release+0x2c9/0x670 [ 33.746298] ? trace_hardirqs_on+0xd/0x10 [ 33.750426] ? __local_bh_enable_ip+0x161/0x230 [ 33.755083] smc_release+0x3cf/0x670 [ 33.758782] __sock_release+0xd7/0x260 [ 33.762653] ? __sock_release+0x260/0x260 [ 33.766780] sock_close+0x19/0x20 [ 33.770220] __fput+0x355/0x8b0 [ 33.773484] ? fput+0x1a0/0x1a0 [ 33.776761] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.781237] ____fput+0x15/0x20 [ 33.784500] task_work_run+0x1ec/0x2a0 [ 33.788368] ? task_work_cancel+0x250/0x250 [ 33.792672] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.798190] ? switch_task_namespaces+0xa2/0xd0 [ 33.802841] do_exit+0x1b08/0x2750 [ 33.806366] ? mm_update_next_owner+0x9a0/0x9a0 [ 33.811024] ? lock_pin_lock+0x350/0x350 [ 33.815078] ? kasan_check_read+0x11/0x20 [ 33.819211] ? rcu_is_watching+0x8c/0x150 [ 33.823338] ? rcu_report_qs_rnp+0x7a0/0x7a0 [ 33.827733] ? check_usage_backwards+0x164/0x3d0 [ 33.832472] ? print_shortest_lock_dependencies+0x80/0x80 [ 33.837989] ? unwind_get_return_address+0x61/0xa0 [ 33.842901] ? graph_lock+0x170/0x170 [ 33.846682] ? graph_lock+0x170/0x170 [ 33.850470] ? find_held_lock+0x36/0x1c0 [ 33.854515] ? lock_downgrade+0x8f0/0x8f0 [ 33.858647] ? kasan_check_read+0x11/0x20 [ 33.862773] ? do_raw_spin_unlock+0xa7/0x2f0 [ 33.867163] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.872160] ? release_sock+0x1ec/0x2c0 [ 33.876115] ? trace_hardirqs_on+0xd/0x10 [ 33.880242] ? __local_bh_enable_ip+0x161/0x230 [ 33.884894] ? _raw_spin_unlock_bh+0x30/0x40 [ 33.889282] ? release_sock+0x1ec/0x2c0 [ 33.893237] ? __release_sock+0x3a0/0x3a0 [ 33.897364] ? __local_bh_enable_ip+0x161/0x230 [ 33.902024] ? smc_setsockopt+0x388/0x6e0 [ 33.906164] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.911682] ? __sys_setsockopt+0x257/0x3b0 [ 33.915988] do_group_exit+0x177/0x440 [ 33.919858] ? mm_fault_error+0x380/0x380 [ 33.923985] ? __ia32_sys_exit+0x50/0x50 [ 33.928040] ? do_syscall_64+0x9a/0x820 [ 33.931998] __x64_sys_exit_group+0x3e/0x50 [ 33.936306] do_syscall_64+0x1b9/0x820 [ 33.940176] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.945092] ? syscall_return_slowpath+0x31d/0x5e0 [ 33.950008] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.955364] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.960198] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.965369] RIP: 0033:0x43ec78 [ 33.968535] Code: Bad RIP value. [ 33.971895] RSP: 002b:00007ffdbd9eed88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.979583] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ec78 [ 33.986831] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.994083] RBP: 00000000004be528 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 34.001332] R10: 0000000020000240 R11: 0000000000000246 R12: 0000000000000001 [ 34.008583] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 34.016418] Dumping ftrace buffer: [ 34.020041] (ftrace buffer empty) [ 34.023729] Kernel Offset: disabled [ 34.027335] Rebooting in 86400 seconds..