[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.843944] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.512235] random: sshd: uninitialized urandom read (32 bytes read) [ 24.839938] random: sshd: uninitialized urandom read (32 bytes read) [ 25.544506] random: sshd: uninitialized urandom read (32 bytes read) [ 25.702658] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 31.173245] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.267214] WARNING: CPU: 1 PID: 4522 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.275654] Kernel panic - not syncing: panic_on_warn set ... [ 31.275654] [ 31.283004] CPU: 1 PID: 4522 Comm: syz-executor960 Not tainted 4.17.0-rc3+ #33 [ 31.290340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.299677] Call Trace: [ 31.302254] dump_stack+0x1b9/0x294 [ 31.305879] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.311067] ? smc_unhash_sk+0x270/0x4a0 [ 31.315112] panic+0x22f/0x4de [ 31.318320] ? add_taint.cold.5+0x16/0x16 [ 31.322452] ? __warn.cold.8+0x148/0x1b3 [ 31.326503] ? __warn.cold.8+0x117/0x1b3 [ 31.330556] ? smc_unhash_sk+0x345/0x4a0 [ 31.334610] __warn.cold.8+0x163/0x1b3 [ 31.338476] ? smc_unhash_sk+0x345/0x4a0 [ 31.342516] report_bug+0x252/0x2d0 [ 31.346125] do_error_trap+0x1de/0x490 [ 31.349994] ? graph_lock+0x170/0x170 [ 31.353784] ? math_error+0x420/0x420 [ 31.357570] ? lock_acquire+0x1dc/0x520 [ 31.361529] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.366355] do_invalid_op+0x1b/0x20 [ 31.370060] invalid_op+0x14/0x20 [ 31.373502] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.378148] RSP: 0018:ffff8801acf2f488 EFLAGS: 00010293 [ 31.383495] RAX: ffff8801ace08580 RBX: ffff8801a873e7c0 RCX: ffffffff873fe71e [ 31.390926] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 31.398202] RBP: ffff8801acf2f570 R08: ffff8801ace08580 R09: ffffed00350e7d08 [ 31.405452] R10: ffffed00350e7d08 R11: ffff8801a873e843 R12: 1ffff100359e5e95 [ 31.412702] R13: ffff8801acf2f548 R14: ffffffff8970e4e0 R15: ffff8801a873e840 [ 31.419966] ? smc_unhash_sk+0x28e/0x4a0 [ 31.424021] ? smc_unhash_sk+0x345/0x4a0 [ 31.428065] ? smc_unhash_sk+0x345/0x4a0 [ 31.432109] ? smc_rx_data_available+0x100/0x100 [ 31.437466] ? release_sock+0x1e2/0x2b0 [ 31.441430] ? __local_bh_enable_ip+0x161/0x230 [ 31.446093] ? __release_sock+0x3a0/0x3a0 [ 31.450230] ? smc_release+0x269/0x610 [ 31.454104] ? trace_hardirqs_on+0xd/0x10 [ 31.458236] ? __local_bh_enable_ip+0x161/0x230 [ 31.462886] smc_release+0x36e/0x610 [ 31.466584] sock_release+0x96/0x1b0 [ 31.470280] ? sock_alloc_file+0x4e0/0x4e0 [ 31.474496] sock_close+0x16/0x20 [ 31.477931] __fput+0x34d/0x890 [ 31.481192] ? fput+0x1a0/0x1a0 [ 31.484462] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.488940] ____fput+0x15/0x20 [ 31.492203] task_work_run+0x1e4/0x290 [ 31.496080] ? task_work_cancel+0x240/0x240 [ 31.500385] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.505905] ? switch_task_namespaces+0xa2/0xd0 [ 31.510555] do_exit+0x1aee/0x2730 [ 31.514078] ? mm_update_next_owner+0x980/0x980 [ 31.518725] ? lock_downgrade+0x8e0/0x8e0 [ 31.522853] ? noop_count+0x40/0x40 [ 31.526467] ? lock_pin_lock+0x350/0x350 [ 31.530519] ? kasan_check_read+0x11/0x20 [ 31.534666] ? rcu_is_watching+0x85/0x140 [ 31.538805] ? rcu_bh_force_quiescent_state+0x20/0x20 [ 31.543997] ? is_bpf_text_address+0xd7/0x170 [ 31.548481] ? check_usage_backwards+0x151/0x3a0 [ 31.553215] ? graph_lock+0x170/0x170 [ 31.556998] ? graph_lock+0x170/0x170 [ 31.560791] ? find_held_lock+0x36/0x1c0 [ 31.564839] ? lock_downgrade+0x8e0/0x8e0 [ 31.568971] ? kasan_check_read+0x11/0x20 [ 31.573100] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.577489] ? __local_bh_enable_ip+0x161/0x230 [ 31.582138] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.587135] ? release_sock+0x1e2/0x2b0 [ 31.591089] ? trace_hardirqs_on+0xd/0x10 [ 31.595217] ? __local_bh_enable_ip+0x161/0x230 [ 31.599890] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.604470] ? release_sock+0x1e2/0x2b0 [ 31.608427] ? __release_sock+0x3a0/0x3a0 [ 31.612556] ? __local_bh_enable_ip+0x161/0x230 [ 31.617212] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 31.622477] ? smc_setsockopt+0x1ed/0x630 [ 31.626612] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.632148] ? __sys_setsockopt+0x24f/0x390 [ 31.636462] do_group_exit+0x16f/0x430 [ 31.640333] ? mm_fault_error+0x380/0x380 [ 31.644463] ? __ia32_sys_exit+0x50/0x50 [ 31.648518] ? do_syscall_64+0x92/0x800 [ 31.652480] __x64_sys_exit_group+0x3e/0x50 [ 31.656785] do_syscall_64+0x1b1/0x800 [ 31.660657] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.665577] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.670488] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.676615] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.681442] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.686611] RIP: 0033:0x43e8d8 [ 31.689778] RSP: 002b:00007ffdc0f063a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.697465] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e8d8 [ 31.704722] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.711980] RBP: 00000000004be280 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.719262] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 31.726515] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.734362] Dumping ftrace buffer: [ 31.737964] (ftrace buffer empty) [ 31.741653] Kernel Offset: disabled [ 31.745262] Rebooting in 86400 seconds..