[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.784378] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 23.233307] random: sshd: uninitialized urandom read (32 bytes read) [ 23.731479] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.507997] random: sshd: uninitialized urandom read (32 bytes read) [ 24.670014] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.42' (ECDSA) to the list of known hosts. [ 30.186507] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.281486] WARNING: CPU: 1 PID: 4559 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 30.289895] Kernel panic - not syncing: panic_on_warn set ... [ 30.289895] [ 30.297256] CPU: 1 PID: 4559 Comm: syz-executor252 Not tainted 4.17.0-rc3+ #33 [ 30.304604] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.313948] Call Trace: [ 30.316542] dump_stack+0x1b9/0x294 [ 30.320154] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.325344] ? smc_unhash_sk+0x270/0x4a0 [ 30.329400] panic+0x22f/0x4de [ 30.332675] ? add_taint.cold.5+0x16/0x16 [ 30.336810] ? __warn.cold.8+0x148/0x1b3 [ 30.340852] ? __warn.cold.8+0x117/0x1b3 [ 30.344904] ? smc_unhash_sk+0x345/0x4a0 [ 30.348976] __warn.cold.8+0x163/0x1b3 [ 30.352871] ? smc_unhash_sk+0x345/0x4a0 [ 30.356917] report_bug+0x252/0x2d0 [ 30.360546] do_error_trap+0x1de/0x490 [ 30.364437] ? graph_lock+0x170/0x170 [ 30.368236] ? math_error+0x420/0x420 [ 30.372045] ? lock_acquire+0x1dc/0x520 [ 30.376026] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.380872] do_invalid_op+0x1b/0x20 [ 30.384584] invalid_op+0x14/0x20 [ 30.388025] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 30.392678] RSP: 0018:ffff8801acb7f488 EFLAGS: 00010293 [ 30.398036] RAX: ffff8801d9500100 RBX: ffff8801d92457c0 RCX: ffffffff873fe71e [ 30.405291] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 30.412544] RBP: ffff8801acb7f570 R08: ffff8801d9500100 R09: ffffed003b248b08 [ 30.419800] R10: ffffed003b248b08 R11: ffff8801d9245843 R12: 1ffff1003596fe95 [ 30.427152] R13: ffff8801acb7f548 R14: ffffffff8970e4e0 R15: ffff8801d9245840 [ 30.434420] ? smc_unhash_sk+0x28e/0x4a0 [ 30.438468] ? smc_unhash_sk+0x345/0x4a0 [ 30.442534] ? smc_unhash_sk+0x345/0x4a0 [ 30.446582] ? smc_rx_data_available+0x100/0x100 [ 30.451323] ? release_sock+0x1e2/0x2b0 [ 30.455296] ? __local_bh_enable_ip+0x161/0x230 [ 30.459966] ? __release_sock+0x3a0/0x3a0 [ 30.464105] ? smc_release+0x269/0x610 [ 30.467976] ? trace_hardirqs_on+0xd/0x10 [ 30.472109] ? __local_bh_enable_ip+0x161/0x230 [ 30.476764] smc_release+0x36e/0x610 [ 30.480468] sock_release+0x96/0x1b0 [ 30.484180] ? sock_alloc_file+0x4e0/0x4e0 [ 30.488405] sock_close+0x16/0x20 [ 30.491844] __fput+0x34d/0x890 [ 30.495112] ? fput+0x1a0/0x1a0 [ 30.498380] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.502880] ____fput+0x15/0x20 [ 30.506155] task_work_run+0x1e4/0x290 [ 30.510031] ? task_work_cancel+0x240/0x240 [ 30.514342] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.519893] ? switch_task_namespaces+0xa2/0xd0 [ 30.524562] do_exit+0x1aee/0x2730 [ 30.528107] ? mm_update_next_owner+0x980/0x980 [ 30.532772] ? kasan_check_write+0x14/0x20 [ 30.537000] ? do_raw_spin_lock+0xc1/0x200 [ 30.541225] ? trace_hardirqs_off+0xd/0x10 [ 30.545537] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 30.550626] ? debug_check_no_obj_freed+0x2ff/0x584 [ 30.555627] ? __local_bh_enable_ip+0x161/0x230 [ 30.560287] ? kasan_check_read+0x11/0x20 [ 30.564419] ? rcu_is_watching+0x85/0x140 [ 30.568554] ? rcu_pm_notify+0xc0/0xc0 [ 30.572430] ? ___sys_sendmsg+0x31a/0x940 [ 30.576574] ? kfree+0x1e9/0x260 [ 30.579926] ? ___sys_sendmsg+0x31f/0x940 [ 30.584068] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.589607] ? copy_msghdr_from_user+0x560/0x560 [ 30.594370] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 30.599111] ? graph_lock+0x170/0x170 [ 30.602904] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.608427] ? __fget_light+0x2ef/0x430 [ 30.612387] ? fget_raw+0x20/0x20 [ 30.615824] ? find_held_lock+0x36/0x1c0 [ 30.619880] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.625405] ? sockfd_lookup_light+0xc5/0x160 [ 30.629890] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.635436] ? __sys_sendmsg+0x1aa/0x270 [ 30.639489] ? __ia32_sys_shutdown+0x80/0x80 [ 30.643899] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.649431] ? __do_page_fault+0x441/0xe40 [ 30.653660] do_group_exit+0x16f/0x430 [ 30.657538] ? __ia32_sys_exit+0x50/0x50 [ 30.661590] ? do_syscall_64+0x92/0x800 [ 30.665564] __x64_sys_exit_group+0x3e/0x50 [ 30.669882] do_syscall_64+0x1b1/0x800 [ 30.673753] ? syscall_return_slowpath+0x5c0/0x5c0 [ 30.678680] ? syscall_return_slowpath+0x30f/0x5c0 [ 30.683599] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.688964] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.693797] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.698980] RIP: 0033:0x43eab8 [ 30.702154] RSP: 002b:00007ffdb8a83f48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.709857] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043eab8 [ 30.717115] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.724383] RBP: 00000000004be460 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.731643] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 30.738926] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 30.746953] Dumping ftrace buffer: [ 30.750624] (ftrace buffer empty) [ 30.754322] Kernel Offset: disabled [ 30.757937] Rebooting in 86400 seconds..