[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.922490] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.220298] random: sshd: uninitialized urandom read (32 bytes read) [ 25.728173] random: sshd: uninitialized urandom read (32 bytes read) [ 26.458266] random: sshd: uninitialized urandom read (32 bytes read) [ 26.616996] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.43' (ECDSA) to the list of known hosts. [ 32.235620] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.328074] WARNING: CPU: 1 PID: 4545 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.336497] Kernel panic - not syncing: panic_on_warn set ... [ 32.336497] [ 32.343858] CPU: 1 PID: 4545 Comm: syz-executor462 Not tainted 4.17.0-rc3+ #37 [ 32.351209] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.360555] Call Trace: [ 32.363131] dump_stack+0x1b9/0x294 [ 32.366739] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.371924] ? smc_unhash_sk+0x320/0x4a0 [ 32.375969] panic+0x22f/0x4de [ 32.379142] ? add_taint.cold.5+0x16/0x16 [ 32.383272] ? __warn.cold.8+0x148/0x1b3 [ 32.387329] ? __warn.cold.8+0x117/0x1b3 [ 32.391373] ? smc_unhash_sk+0x345/0x4a0 [ 32.395425] __warn.cold.8+0x163/0x1b3 [ 32.399296] ? smc_unhash_sk+0x345/0x4a0 [ 32.403340] report_bug+0x252/0x2d0 [ 32.406964] do_error_trap+0x1de/0x490 [ 32.410841] ? graph_lock+0x170/0x170 [ 32.414629] ? math_error+0x420/0x420 [ 32.418418] ? lock_acquire+0x1dc/0x520 [ 32.422403] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.427231] do_invalid_op+0x1b/0x20 [ 32.430933] invalid_op+0x14/0x20 [ 32.434373] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.439027] RSP: 0018:ffff8801ad6d7488 EFLAGS: 00010293 [ 32.444386] RAX: ffff8801d92c04c0 RBX: ffff8801d92037c0 RCX: ffffffff873f756e [ 32.451636] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 32.458888] RBP: ffff8801ad6d7570 R08: ffff8801d92c04c0 R09: ffffed003b240708 [ 32.466139] R10: ffffed003b240708 R11: ffff8801d9203843 R12: 1ffff10035adae95 [ 32.473392] R13: ffff8801ad6d7548 R14: ffffffff8970b1e0 R15: ffff8801d9203840 [ 32.480659] ? smc_unhash_sk+0x28e/0x4a0 [ 32.484702] ? smc_unhash_sk+0x345/0x4a0 [ 32.488749] ? smc_unhash_sk+0x345/0x4a0 [ 32.492792] ? smc_rx_data_available+0x100/0x100 [ 32.497530] ? release_sock+0x1e2/0x2b0 [ 32.501487] ? __local_bh_enable_ip+0x161/0x230 [ 32.506153] ? __release_sock+0x3a0/0x3a0 [ 32.510285] ? smc_release+0x269/0x610 [ 32.514156] ? trace_hardirqs_on+0xd/0x10 [ 32.518285] ? __local_bh_enable_ip+0x161/0x230 [ 32.522935] smc_release+0x36e/0x610 [ 32.526633] sock_release+0x96/0x1b0 [ 32.530337] ? sock_alloc_file+0x4e0/0x4e0 [ 32.534562] sock_close+0x16/0x20 [ 32.537997] __fput+0x34d/0x890 [ 32.541266] ? fput+0x1a0/0x1a0 [ 32.544530] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.549011] ____fput+0x15/0x20 [ 32.552285] task_work_run+0x1e4/0x290 [ 32.556154] ? task_work_cancel+0x240/0x240 [ 32.560465] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.565998] ? switch_task_namespaces+0xa2/0xd0 [ 32.570661] do_exit+0x1aee/0x2730 [ 32.574187] ? mm_update_next_owner+0x980/0x980 [ 32.578838] ? kasan_check_read+0x11/0x20 [ 32.582969] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.587361] ? __local_bh_enable_ip+0x161/0x230 [ 32.592037] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.597054] ? release_sock+0x1e2/0x2b0 [ 32.601020] ? trace_hardirqs_on+0xd/0x10 [ 32.605161] ? __local_bh_enable_ip+0x161/0x230 [ 32.609814] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.614217] ? kasan_check_read+0x11/0x20 [ 32.618354] ? rcu_is_watching+0x85/0x140 [ 32.622486] ? rcu_pm_notify+0xc0/0xc0 [ 32.626361] ? ___sys_sendmsg+0x31a/0x940 [ 32.630500] ? kfree+0x1e9/0x260 [ 32.633854] ? ___sys_sendmsg+0x31f/0x940 [ 32.637987] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.643510] ? __handle_mm_fault+0x93a/0x4310 [ 32.648000] ? copy_msghdr_from_user+0x560/0x560 [ 32.652759] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.657507] ? graph_lock+0x170/0x170 [ 32.661296] ? find_held_lock+0x36/0x1c0 [ 32.665345] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.670868] ? __fget_light+0x2ef/0x430 [ 32.674825] ? fget_raw+0x20/0x20 [ 32.678259] ? find_held_lock+0x36/0x1c0 [ 32.682324] ? lock_downgrade+0x8e0/0x8e0 [ 32.686458] ? handle_mm_fault+0x8c0/0xc70 [ 32.690684] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.696204] ? sockfd_lookup_light+0xc5/0x160 [ 32.700693] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.706223] ? __sys_sendmsg+0x1aa/0x270 [ 32.710280] ? __ia32_sys_shutdown+0x80/0x80 [ 32.714688] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.720219] ? __do_page_fault+0x441/0xe40 [ 32.724448] do_group_exit+0x16f/0x430 [ 32.728321] ? __ia32_sys_exit+0x50/0x50 [ 32.732369] ? do_syscall_64+0x92/0x800 [ 32.736333] __x64_sys_exit_group+0x3e/0x50 [ 32.740640] do_syscall_64+0x1b1/0x800 [ 32.744509] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.749433] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.754354] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.759707] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.764538] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.769715] RIP: 0033:0x43e928 [ 32.772893] RSP: 002b:00007ffed4ce7c88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.780588] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e928 [ 32.787840] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.795104] RBP: 00000000004be2c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.802367] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 32.809636] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.817484] Dumping ftrace buffer: [ 32.821131] (ftrace buffer empty) [ 32.824821] Kernel Offset: disabled [ 32.828435] Rebooting in 86400 seconds..