[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.184074] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.776832] random: sshd: uninitialized urandom read (32 bytes read) [ 23.154457] random: sshd: uninitialized urandom read (32 bytes read) [ 23.883316] random: sshd: uninitialized urandom read (32 bytes read) [ 24.040917] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.2' (ECDSA) to the list of known hosts. [ 29.456464] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 29.545230] WARNING: CPU: 1 PID: 4479 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 29.553658] Kernel panic - not syncing: panic_on_warn set ... [ 29.553658] [ 29.561015] CPU: 1 PID: 4479 Comm: syz-executor467 Not tainted 4.17.0-rc2+ #27 [ 29.568358] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.577691] Call Trace: [ 29.580263] dump_stack+0x1b9/0x294 [ 29.583888] ? dump_stack_print_info.cold.2+0x52/0x52 [ 29.589062] ? smc_unhash_sk+0x260/0x4a0 [ 29.593106] panic+0x22f/0x4de [ 29.596278] ? add_taint.cold.5+0x16/0x16 [ 29.600405] ? __warn.cold.8+0x148/0x1b3 [ 29.604444] ? __warn.cold.8+0x117/0x1b3 [ 29.608484] ? smc_unhash_sk+0x345/0x4a0 [ 29.612523] __warn.cold.8+0x163/0x1b3 [ 29.616390] ? smc_unhash_sk+0x345/0x4a0 [ 29.620438] report_bug+0x252/0x2d0 [ 29.624046] do_error_trap+0x1de/0x490 [ 29.627916] ? graph_lock+0x170/0x170 [ 29.631696] ? math_error+0x420/0x420 [ 29.635478] ? lock_acquire+0x1dc/0x520 [ 29.639432] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.644255] do_invalid_op+0x1b/0x20 [ 29.647948] invalid_op+0x14/0x20 [ 29.651380] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 29.656025] RSP: 0018:ffff8801b5557488 EFLAGS: 00010293 [ 29.661368] RAX: ffff8801af9d0300 RBX: ffff8801afa5e7c0 RCX: ffffffff873faf2e [ 29.668616] RDX: 0000000000000000 RSI: ffffffff873fafe5 RDI: 0000000000000005 [ 29.675868] RBP: ffff8801b5557570 R08: ffff8801af9d0300 R09: ffffed0035f4bd08 [ 29.683116] R10: ffffed0035f4bd08 R11: ffff8801afa5e843 R12: 1ffff10036aaae95 [ 29.690365] R13: ffff8801b5557548 R14: ffffffff8970df20 R15: ffff8801afa5e840 [ 29.697620] ? smc_unhash_sk+0x28e/0x4a0 [ 29.701665] ? smc_unhash_sk+0x345/0x4a0 [ 29.705706] ? smc_unhash_sk+0x345/0x4a0 [ 29.709747] ? smc_hash_sk+0x2f0/0x2f0 [ 29.713617] ? release_sock+0x1e2/0x2b0 [ 29.717582] ? __local_bh_enable_ip+0x161/0x230 [ 29.722230] ? __release_sock+0x3a0/0x3a0 [ 29.726355] ? smc_release+0x269/0x610 [ 29.730222] ? trace_hardirqs_on+0xd/0x10 [ 29.734350] ? __local_bh_enable_ip+0x161/0x230 [ 29.739002] smc_release+0x36e/0x610 [ 29.742698] sock_release+0x96/0x1b0 [ 29.746391] ? sock_alloc_file+0x4e0/0x4e0 [ 29.750602] sock_close+0x16/0x20 [ 29.754036] __fput+0x34d/0x890 [ 29.757296] ? fput+0x1a0/0x1a0 [ 29.760556] ? _raw_spin_unlock_irq+0x27/0x70 [ 29.765031] ____fput+0x15/0x20 [ 29.768290] task_work_run+0x1e4/0x290 [ 29.772172] ? task_work_cancel+0x240/0x240 [ 29.776475] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 29.781993] ? switch_task_namespaces+0xa2/0xd0 [ 29.786643] do_exit+0x1aee/0x2730 [ 29.790168] ? mm_update_next_owner+0x980/0x980 [ 29.794816] ? lock_downgrade+0x8e0/0x8e0 [ 29.798944] ? noop_count+0x40/0x40 [ 29.802563] ? lock_pin_lock+0x350/0x350 [ 29.806605] ? kasan_check_read+0x11/0x20 [ 29.810731] ? rcu_is_watching+0x85/0x140 [ 29.814864] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 29.820036] ? is_bpf_text_address+0xd7/0x170 [ 29.824510] ? check_usage_backwards+0x151/0x3a0 [ 29.829243] ? graph_lock+0x170/0x170 [ 29.833029] ? graph_lock+0x170/0x170 [ 29.836815] ? find_held_lock+0x36/0x1c0 [ 29.840870] ? lock_downgrade+0x8e0/0x8e0 [ 29.845001] ? kasan_check_read+0x11/0x20 [ 29.849130] ? do_raw_spin_unlock+0x9e/0x2e0 [ 29.853518] ? __local_bh_enable_ip+0x161/0x230 [ 29.858185] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 29.863181] ? release_sock+0x1e2/0x2b0 [ 29.867134] ? trace_hardirqs_on+0xd/0x10 [ 29.871262] ? __local_bh_enable_ip+0x161/0x230 [ 29.875911] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.880298] ? release_sock+0x1e2/0x2b0 [ 29.884252] ? __release_sock+0x3a0/0x3a0 [ 29.888381] ? __local_bh_enable_ip+0x161/0x230 [ 29.893031] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 29.898203] ? smc_setsockopt+0x1ed/0x630 [ 29.902331] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 29.907850] ? __sys_setsockopt+0x24f/0x390 [ 29.912153] do_group_exit+0x16f/0x430 [ 29.916021] ? mm_fault_error+0x380/0x380 [ 29.920150] ? __ia32_sys_exit+0x50/0x50 [ 29.924195] ? do_syscall_64+0x92/0x800 [ 29.928150] __x64_sys_exit_group+0x3e/0x50 [ 29.932460] do_syscall_64+0x1b1/0x800 [ 29.936327] ? syscall_return_slowpath+0x5c0/0x5c0 [ 29.941236] ? syscall_return_slowpath+0x30f/0x5c0 [ 29.946150] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 29.951495] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 29.956319] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 29.961484] RIP: 0033:0x43e8b8 [ 29.964653] RSP: 002b:00007fffee5fd778 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 29.972342] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8b8 [ 29.979603] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 29.986853] RBP: 00000000004be260 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 29.994102] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 30.001348] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.009125] Dumping ftrace buffer: [ 30.012741] (ftrace buffer empty) [ 30.016433] Kernel Offset: disabled [ 30.020043] Rebooting in 86400 seconds..