[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.056096] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.378953] random: sshd: uninitialized urandom read (32 bytes read) [ 25.819502] random: sshd: uninitialized urandom read (32 bytes read) [ 26.575872] random: sshd: uninitialized urandom read (32 bytes read) [ 26.731275] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.7' (ECDSA) to the list of known hosts. [ 32.263246] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.353714] WARNING: CPU: 1 PID: 4538 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.362199] Kernel panic - not syncing: panic_on_warn set ... [ 32.362199] [ 32.369548] CPU: 1 PID: 4538 Comm: syz-executor135 Not tainted 4.17.0-rc3+ #36 [ 32.376887] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.386219] Call Trace: [ 32.388792] dump_stack+0x1b9/0x294 [ 32.392403] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.397579] ? smc_unhash_sk+0x320/0x4a0 [ 32.401622] panic+0x22f/0x4de [ 32.404794] ? add_taint.cold.5+0x16/0x16 [ 32.408922] ? __warn.cold.8+0x148/0x1b3 [ 32.412982] ? __warn.cold.8+0x117/0x1b3 [ 32.417027] ? smc_unhash_sk+0x345/0x4a0 [ 32.421075] __warn.cold.8+0x163/0x1b3 [ 32.424945] ? smc_unhash_sk+0x345/0x4a0 [ 32.428987] report_bug+0x252/0x2d0 [ 32.432604] do_error_trap+0x1de/0x490 [ 32.436486] ? graph_lock+0x170/0x170 [ 32.440272] ? math_error+0x420/0x420 [ 32.444077] ? lock_acquire+0x1dc/0x520 [ 32.448047] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.452899] do_invalid_op+0x1b/0x20 [ 32.456701] invalid_op+0x14/0x20 [ 32.460223] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.464867] RSP: 0018:ffff8801ad267488 EFLAGS: 00010293 [ 32.470211] RAX: ffff8801ad5be300 RBX: ffff8801d95e27c0 RCX: ffffffff873f756e [ 32.477461] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 32.484710] RBP: ffff8801ad267570 R08: ffff8801ad5be300 R09: ffffed003b2bc508 [ 32.491959] R10: ffffed003b2bc508 R11: ffff8801d95e2843 R12: 1ffff10035a4ce95 [ 32.499208] R13: ffff8801ad267548 R14: ffffffff8970b1e0 R15: ffff8801d95e2840 [ 32.506470] ? smc_unhash_sk+0x28e/0x4a0 [ 32.510511] ? smc_unhash_sk+0x345/0x4a0 [ 32.514555] ? smc_unhash_sk+0x345/0x4a0 [ 32.518597] ? smc_rx_data_available+0x100/0x100 [ 32.523332] ? release_sock+0x1e2/0x2b0 [ 32.527290] ? __local_bh_enable_ip+0x161/0x230 [ 32.531959] ? __release_sock+0x3a0/0x3a0 [ 32.536088] ? smc_release+0x269/0x610 [ 32.539957] ? trace_hardirqs_on+0xd/0x10 [ 32.544088] ? __local_bh_enable_ip+0x161/0x230 [ 32.548738] smc_release+0x36e/0x610 [ 32.552434] sock_release+0x96/0x1b0 [ 32.556127] ? sock_alloc_file+0x4e0/0x4e0 [ 32.560340] sock_close+0x16/0x20 [ 32.563775] __fput+0x34d/0x890 [ 32.567045] ? fput+0x1a0/0x1a0 [ 32.570308] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.574785] ____fput+0x15/0x20 [ 32.578055] task_work_run+0x1e4/0x290 [ 32.581924] ? task_work_cancel+0x240/0x240 [ 32.586229] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.591753] ? switch_task_namespaces+0xa2/0xd0 [ 32.596405] do_exit+0x1aee/0x2730 [ 32.599948] ? mm_update_next_owner+0x980/0x980 [ 32.604609] ? kasan_check_read+0x11/0x20 [ 32.608740] ? do_raw_spin_unlock+0x9e/0x2e0 [ 32.613130] ? __local_bh_enable_ip+0x161/0x230 [ 32.617782] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.622778] ? release_sock+0x1e2/0x2b0 [ 32.626734] ? trace_hardirqs_on+0xd/0x10 [ 32.630875] ? __local_bh_enable_ip+0x161/0x230 [ 32.635525] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.639918] ? kasan_check_read+0x11/0x20 [ 32.644050] ? rcu_is_watching+0x85/0x140 [ 32.648178] ? rcu_pm_notify+0xc0/0xc0 [ 32.652054] ? ___sys_sendmsg+0x31a/0x940 [ 32.656182] ? kfree+0x1e9/0x260 [ 32.659529] ? ___sys_sendmsg+0x31f/0x940 [ 32.663669] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.669199] ? copy_msghdr_from_user+0x560/0x560 [ 32.673937] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.678675] ? graph_lock+0x170/0x170 [ 32.682462] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.687979] ? __fget_light+0x2ef/0x430 [ 32.691935] ? find_held_lock+0x36/0x1c0 [ 32.695985] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.701503] ? sockfd_lookup_light+0xc5/0x160 [ 32.705981] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.711496] ? __sys_sendmsg+0x1aa/0x270 [ 32.715546] ? __ia32_sys_shutdown+0x80/0x80 [ 32.719937] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.725454] ? __do_page_fault+0x441/0xe40 [ 32.729672] do_group_exit+0x16f/0x430 [ 32.733549] ? __ia32_sys_exit+0x50/0x50 [ 32.737595] ? do_syscall_64+0x92/0x800 [ 32.741556] __x64_sys_exit_group+0x3e/0x50 [ 32.745859] do_syscall_64+0x1b1/0x800 [ 32.749727] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.754637] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.759548] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.764892] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.769730] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.774906] RIP: 0033:0x43ea18 [ 32.778077] RSP: 002b:00007fff4fe9eaa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.785766] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea18 [ 32.793021] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.800281] RBP: 00000000004be3c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.807528] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 32.814776] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.822610] Dumping ftrace buffer: [ 32.826223] (ftrace buffer empty) [ 32.829911] Kernel Offset: disabled [ 32.833524] Rebooting in 86400 seconds..