[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.804290] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.518592] random: sshd: uninitialized urandom read (32 bytes read) [ 23.867725] random: sshd: uninitialized urandom read (32 bytes read) [ 24.619981] random: sshd: uninitialized urandom read (32 bytes read) [ 39.974250] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.49' (ECDSA) to the list of known hosts. [ 45.451080] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 45.546825] WARNING: CPU: 1 PID: 4542 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 45.555226] Kernel panic - not syncing: panic_on_warn set ... [ 45.555226] [ 45.562610] CPU: 1 PID: 4542 Comm: syz-executor517 Not tainted 4.17.0-rc4+ #44 [ 45.569960] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.579295] Call Trace: [ 45.581872] dump_stack+0x1b9/0x294 [ 45.585493] ? dump_stack_print_info.cold.2+0x52/0x52 [ 45.590677] ? smc_unhash_sk+0x330/0x4a0 [ 45.594737] panic+0x22f/0x4de [ 45.597927] ? add_taint.cold.5+0x16/0x16 [ 45.602078] ? __warn.cold.8+0x148/0x1b3 [ 45.606229] ? __warn.cold.8+0x117/0x1b3 [ 45.610287] ? smc_unhash_sk+0x345/0x4a0 [ 45.614335] __warn.cold.8+0x163/0x1b3 [ 45.618232] ? smc_unhash_sk+0x345/0x4a0 [ 45.622314] report_bug+0x252/0x2d0 [ 45.625939] do_error_trap+0x1de/0x490 [ 45.629846] ? graph_lock+0x170/0x170 [ 45.633667] ? math_error+0x420/0x420 [ 45.637463] ? lock_acquire+0x1dc/0x520 [ 45.641520] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.646350] do_invalid_op+0x1b/0x20 [ 45.650063] invalid_op+0x14/0x20 [ 45.653499] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 45.658321] RSP: 0018:ffff8801af767488 EFLAGS: 00010293 [ 45.663673] RAX: ffff8801d9b8c740 RBX: ffff8801d7fa97c0 RCX: ffffffff8740565e [ 45.671414] RDX: 0000000000000000 RSI: ffffffff87405715 RDI: 0000000000000005 [ 45.678681] RBP: ffff8801af767570 R08: ffff8801d9b8c740 R09: ffffed003aff5308 [ 45.685936] R10: ffffed003aff5308 R11: ffff8801d7fa9843 R12: 1ffff10035eece95 [ 45.693281] R13: ffff8801af767548 R14: ffffffff8970cba0 R15: ffff8801d7fa9840 [ 45.700728] ? smc_unhash_sk+0x28e/0x4a0 [ 45.704779] ? smc_unhash_sk+0x345/0x4a0 [ 45.708846] ? smc_unhash_sk+0x345/0x4a0 [ 45.712983] ? smc_rx_data_available+0x100/0x100 [ 45.717736] ? release_sock+0x1e2/0x2b0 [ 45.721715] ? __local_bh_enable_ip+0x161/0x230 [ 45.726371] ? __release_sock+0x3a0/0x3a0 [ 45.730505] ? smc_release+0x269/0x610 [ 45.734464] ? trace_hardirqs_on+0xd/0x10 [ 45.738599] ? __local_bh_enable_ip+0x161/0x230 [ 45.743360] smc_release+0x36e/0x610 [ 45.747073] sock_release+0x96/0x1b0 [ 45.750780] ? sock_alloc_file+0x4e0/0x4e0 [ 45.755017] sock_close+0x16/0x20 [ 45.758480] __fput+0x34d/0x890 [ 45.761769] ? fput+0x1a0/0x1a0 [ 45.765043] ? _raw_spin_unlock_irq+0x27/0x70 [ 45.769525] ____fput+0x15/0x20 [ 45.772789] task_work_run+0x1e4/0x290 [ 45.776658] ? task_work_cancel+0x240/0x240 [ 45.780967] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 45.786488] ? switch_task_namespaces+0xa2/0xd0 [ 45.791156] do_exit+0x1aee/0x2730 [ 45.794684] ? mm_update_next_owner+0x980/0x980 [ 45.799335] ? kasan_check_read+0x11/0x20 [ 45.803479] ? do_raw_spin_unlock+0x9e/0x2e0 [ 45.807872] ? __local_bh_enable_ip+0x161/0x230 [ 45.812523] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 45.817520] ? release_sock+0x1e2/0x2b0 [ 45.821482] ? trace_hardirqs_on+0xd/0x10 [ 45.825614] ? __local_bh_enable_ip+0x161/0x230 [ 45.830282] ? _raw_spin_unlock_bh+0x30/0x40 [ 45.834678] ? kasan_check_read+0x11/0x20 [ 45.839132] ? rcu_is_watching+0x85/0x140 [ 45.843264] ? rcu_pm_notify+0xc0/0xc0 [ 45.847142] ? ___sys_sendmsg+0x31a/0x940 [ 45.851289] ? kfree+0x1e9/0x260 [ 45.854643] ? ___sys_sendmsg+0x31f/0x940 [ 45.858801] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.864352] ? copy_msghdr_from_user+0x560/0x560 [ 45.869102] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 45.873931] ? graph_lock+0x170/0x170 [ 45.877720] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.883255] ? __fget_light+0x2ef/0x430 [ 45.887224] ? find_held_lock+0x36/0x1c0 [ 45.891275] ? lock_downgrade+0x8e0/0x8e0 [ 45.895415] ? handle_mm_fault+0x8c0/0xc70 [ 45.899645] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 45.905199] ? sockfd_lookup_light+0xc5/0x160 [ 45.909686] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.915210] ? __sys_sendmsg+0x1aa/0x270 [ 45.919267] ? __ia32_sys_shutdown+0x80/0x80 [ 45.923664] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.929185] ? __do_page_fault+0x441/0xe40 [ 45.933418] do_group_exit+0x16f/0x430 [ 45.937294] ? __ia32_sys_exit+0x50/0x50 [ 45.941339] ? do_syscall_64+0x92/0x800 [ 45.945311] __x64_sys_exit_group+0x3e/0x50 [ 45.949618] do_syscall_64+0x1b1/0x800 [ 45.953495] ? syscall_return_slowpath+0x5c0/0x5c0 [ 45.958410] ? syscall_return_slowpath+0x30f/0x5c0 [ 45.963423] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 45.968801] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 45.973724] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 45.978897] RIP: 0033:0x43e9a8 [ 45.982169] RSP: 002b:00007ffdec5631a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 45.990264] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e9a8 [ 45.997545] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 46.004829] RBP: 00000000004be340 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 46.012107] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 46.019368] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 46.027234] Dumping ftrace buffer: [ 46.030880] (ftrace buffer empty) [ 46.034586] Kernel Offset: disabled [ 46.038209] Rebooting in 86400 seconds..