[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.247730] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.089423] random: sshd: uninitialized urandom read (32 bytes read) [ 25.374948] random: sshd: uninitialized urandom read (32 bytes read) [ 26.069554] random: sshd: uninitialized urandom read (32 bytes read) [ 26.226685] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 31.634185] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.731789] WARNING: CPU: 1 PID: 4459 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.740155] Kernel panic - not syncing: panic_on_warn set ... [ 31.740155] [ 31.747500] CPU: 1 PID: 4459 Comm: syz-executor034 Not tainted 4.17.0-rc3+ #38 [ 31.754835] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.764168] Call Trace: [ 31.766737] dump_stack+0x1b9/0x294 [ 31.770347] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.775519] ? smc_unhash_sk+0x290/0x4a0 [ 31.779558] panic+0x22f/0x4de [ 31.782728] ? add_taint.cold.5+0x16/0x16 [ 31.786858] ? __warn.cold.8+0x148/0x1b3 [ 31.790904] ? __warn.cold.8+0x117/0x1b3 [ 31.794950] ? smc_unhash_sk+0x345/0x4a0 [ 31.798991] __warn.cold.8+0x163/0x1b3 [ 31.802861] ? smc_unhash_sk+0x345/0x4a0 [ 31.806913] report_bug+0x252/0x2d0 [ 31.810523] do_error_trap+0x1de/0x490 [ 31.814391] ? graph_lock+0x170/0x170 [ 31.818174] ? math_error+0x420/0x420 [ 31.821958] ? lock_acquire+0x1dc/0x520 [ 31.825911] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.830733] do_invalid_op+0x1b/0x20 [ 31.834426] invalid_op+0x14/0x20 [ 31.837865] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.842508] RSP: 0018:ffff8801b16cf488 EFLAGS: 00010293 [ 31.847850] RAX: ffff8801b20fe4c0 RBX: ffff8801b141d7c0 RCX: ffffffff873f7cfe [ 31.855100] RDX: 0000000000000000 RSI: ffffffff873f7db5 RDI: 0000000000000005 [ 31.862348] RBP: ffff8801b16cf570 R08: ffff8801b20fe4c0 R09: ffffed0036283b08 [ 31.869595] R10: ffffed0036283b08 R11: ffff8801b141d843 R12: 1ffff100362d9e95 [ 31.876850] R13: ffff8801b16cf548 R14: ffffffff8970b1e0 R15: ffff8801b141d840 [ 31.884107] ? smc_unhash_sk+0x28e/0x4a0 [ 31.888153] ? smc_unhash_sk+0x345/0x4a0 [ 31.892203] ? smc_unhash_sk+0x345/0x4a0 [ 31.896247] ? smc_rx_data_available+0x100/0x100 [ 31.900982] ? release_sock+0x1e2/0x2b0 [ 31.904939] ? __local_bh_enable_ip+0x161/0x230 [ 31.909584] ? __release_sock+0x3a0/0x3a0 [ 31.913708] ? smc_release+0x269/0x610 [ 31.917576] ? trace_hardirqs_on+0xd/0x10 [ 31.921704] ? __local_bh_enable_ip+0x161/0x230 [ 31.926354] smc_release+0x36e/0x610 [ 31.930062] sock_release+0x96/0x1b0 [ 31.933757] ? sock_alloc_file+0x4e0/0x4e0 [ 31.937980] sock_close+0x16/0x20 [ 31.941860] __fput+0x34d/0x890 [ 31.945121] ? fput+0x1a0/0x1a0 [ 31.948380] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.952857] ____fput+0x15/0x20 [ 31.956116] task_work_run+0x1e4/0x290 [ 31.959982] ? task_work_cancel+0x240/0x240 [ 31.964284] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.969799] ? switch_task_namespaces+0xa2/0xd0 [ 31.974448] do_exit+0x1aee/0x2730 [ 31.977968] ? mm_update_next_owner+0x980/0x980 [ 31.982614] ? kasan_check_write+0x14/0x20 [ 31.986826] ? do_raw_spin_lock+0xc1/0x200 [ 31.991054] ? trace_hardirqs_off+0xd/0x10 [ 31.995276] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 32.000359] ? debug_check_no_obj_freed+0x2ff/0x584 [ 32.005371] ? __local_bh_enable_ip+0x161/0x230 [ 32.010044] ? kasan_check_read+0x11/0x20 [ 32.014180] ? rcu_is_watching+0x85/0x140 [ 32.018306] ? rcu_pm_notify+0xc0/0xc0 [ 32.022178] ? ___sys_sendmsg+0x31a/0x940 [ 32.026305] ? kfree+0x1e9/0x260 [ 32.029655] ? ___sys_sendmsg+0x31f/0x940 [ 32.033785] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.039308] ? copy_msghdr_from_user+0x560/0x560 [ 32.044048] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.048781] ? graph_lock+0x170/0x170 [ 32.052562] ? find_held_lock+0x36/0x1c0 [ 32.056605] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.062121] ? __fget_light+0x2ef/0x430 [ 32.066074] ? fget_raw+0x20/0x20 [ 32.069509] ? find_held_lock+0x36/0x1c0 [ 32.073558] ? lock_downgrade+0x8e0/0x8e0 [ 32.077683] ? handle_mm_fault+0x8c0/0xc70 [ 32.081904] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.087420] ? sockfd_lookup_light+0xc5/0x160 [ 32.091895] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.097408] ? __sys_sendmsg+0x1aa/0x270 [ 32.101456] ? __ia32_sys_shutdown+0x80/0x80 [ 32.105846] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.111367] ? __do_page_fault+0x441/0xe40 [ 32.115591] do_group_exit+0x16f/0x430 [ 32.119459] ? __ia32_sys_exit+0x50/0x50 [ 32.123503] ? do_syscall_64+0x92/0x800 [ 32.127460] __x64_sys_exit_group+0x3e/0x50 [ 32.131758] do_syscall_64+0x1b1/0x800 [ 32.135624] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.140447] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.145355] ? retint_kernel+0x10/0x10 [ 32.149229] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.154574] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.159406] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.164582] RIP: 0033:0x43ebe8 [ 32.167750] RSP: 002b:00007ffdeab089a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.175437] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ebe8 [ 32.182693] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.189948] RBP: 00000000004be580 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.197194] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 32.204440] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.212274] Dumping ftrace buffer: [ 32.215884] (ftrace buffer empty) [ 32.219572] Kernel Offset: disabled [ 32.223178] Rebooting in 86400 seconds..