[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.444243] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.417589] random: sshd: uninitialized urandom read (32 bytes read) [ 24.818015] random: sshd: uninitialized urandom read (32 bytes read) [ 25.577072] random: sshd: uninitialized urandom read (32 bytes read) [ 25.732865] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 31.196865] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.288504] IPVS: ftp: loaded support on port[0] = 21 [ 31.327029] WARNING: CPU: 1 PID: 4494 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.335433] Kernel panic - not syncing: panic_on_warn set ... [ 31.335433] [ 31.342788] CPU: 1 PID: 4494 Comm: syz-executor291 Not tainted 4.17.0-rc4+ #46 [ 31.350130] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.359467] Call Trace: [ 31.362044] dump_stack+0x1b9/0x294 [ 31.365656] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.370838] ? smc_unhash_sk+0x330/0x4a0 [ 31.374891] panic+0x22f/0x4de [ 31.378063] ? add_taint.cold.5+0x16/0x16 [ 31.382207] ? __warn.cold.8+0x148/0x1b3 [ 31.386251] ? __warn.cold.8+0x117/0x1b3 [ 31.390294] ? smc_unhash_sk+0x345/0x4a0 [ 31.394336] __warn.cold.8+0x163/0x1b3 [ 31.398202] ? smc_unhash_sk+0x345/0x4a0 [ 31.402247] report_bug+0x252/0x2d0 [ 31.405857] do_error_trap+0x1de/0x490 [ 31.409725] ? graph_lock+0x170/0x170 [ 31.413504] ? math_error+0x420/0x420 [ 31.417293] ? lock_acquire+0x1dc/0x520 [ 31.421263] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.426087] do_invalid_op+0x1b/0x20 [ 31.429781] invalid_op+0x14/0x20 [ 31.433216] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.437882] RSP: 0018:ffff8801ac80f488 EFLAGS: 00010293 [ 31.443254] RAX: ffff8801ac9f2280 RBX: ffff8801d92ce7c0 RCX: ffffffff8740565e [ 31.450504] RDX: 0000000000000000 RSI: ffffffff87405715 RDI: 0000000000000005 [ 31.457759] RBP: ffff8801ac80f570 R08: ffff8801ac9f2280 R09: ffffed003b259d08 [ 31.465015] R10: ffffed003b259d08 R11: ffff8801d92ce843 R12: 1ffff10035901e95 [ 31.472352] R13: ffff8801ac80f548 R14: ffffffff8970cba0 R15: ffff8801d92ce840 [ 31.479617] ? smc_unhash_sk+0x28e/0x4a0 [ 31.483655] ? smc_unhash_sk+0x345/0x4a0 [ 31.487697] ? smc_unhash_sk+0x345/0x4a0 [ 31.491738] ? smc_rx_data_available+0x100/0x100 [ 31.496475] ? release_sock+0x1e2/0x2b0 [ 31.500432] ? __local_bh_enable_ip+0x161/0x230 [ 31.505079] ? __release_sock+0x3a0/0x3a0 [ 31.509204] ? smc_release+0x269/0x610 [ 31.513072] ? trace_hardirqs_on+0xd/0x10 [ 31.517199] ? __local_bh_enable_ip+0x161/0x230 [ 31.521849] smc_release+0x36e/0x610 [ 31.525548] sock_release+0x96/0x1b0 [ 31.529248] ? sock_alloc_file+0x4e0/0x4e0 [ 31.533461] sock_close+0x16/0x20 [ 31.536898] __fput+0x34d/0x890 [ 31.540160] ? fput+0x1a0/0x1a0 [ 31.543421] ? check_same_owner+0x320/0x320 [ 31.547727] ____fput+0x15/0x20 [ 31.550987] task_work_run+0x1e4/0x290 [ 31.554853] ? task_work_cancel+0x240/0x240 [ 31.559157] ? switch_task_namespaces+0xbd/0xd0 [ 31.563811] do_exit+0x1aee/0x2730 [ 31.567339] ? mm_update_next_owner+0x980/0x980 [ 31.571996] ? find_held_lock+0x36/0x1c0 [ 31.576042] ? lock_downgrade+0x8e0/0x8e0 [ 31.580169] ? lock_downgrade+0x8e0/0x8e0 [ 31.584298] ? kasan_check_read+0x11/0x20 [ 31.588427] ? do_raw_spin_unlock+0x9e/0x2e0 [ 31.592821] ? __local_bh_enable_ip+0x161/0x230 [ 31.597471] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 31.602483] ? release_sock+0x1e2/0x2b0 [ 31.606435] ? trace_hardirqs_on+0xd/0x10 [ 31.610566] ? __local_bh_enable_ip+0x161/0x230 [ 31.615241] ? _raw_spin_unlock_bh+0x30/0x40 [ 31.619630] ? release_sock+0x1e2/0x2b0 [ 31.623586] ? __release_sock+0x3a0/0x3a0 [ 31.627716] ? __local_bh_enable_ip+0x161/0x230 [ 31.632365] ? lock_sock_nested+0xe7/0x120 [ 31.636587] ? smc_sendmsg+0x2d5/0x370 [ 31.640454] ? smc_sendpage+0x1a0/0x1a0 [ 31.644412] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.649930] ? sock_sendmsg+0x5a/0x120 [ 31.653802] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.659317] ? __sys_sendto+0x475/0x670 [ 31.663278] ? __ia32_sys_getpeername+0xb0/0xb0 [ 31.667933] ? lock_downgrade+0x8e0/0x8e0 [ 31.672062] ? handle_mm_fault+0x8c0/0xc70 [ 31.676294] ? handle_mm_fault+0x55a/0xc70 [ 31.680518] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.686052] do_group_exit+0x16f/0x430 [ 31.689922] ? mm_fault_error+0x380/0x380 [ 31.694053] ? __ia32_sys_exit+0x50/0x50 [ 31.698099] ? do_syscall_64+0x92/0x800 [ 31.702055] __x64_sys_exit_group+0x3e/0x50 [ 31.706368] do_syscall_64+0x1b1/0x800 [ 31.710246] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.715155] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.720071] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.725415] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.730242] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.735415] RIP: 0033:0x440749 [ 31.738584] RSP: 002b:00007ffd8d3071c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 [ 31.746273] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440749 [ 31.753520] RDX: 0000000000440749 RSI: 0000000000000000 RDI: 0000000000000001 [ 31.760770] RBP: 00000000006cb018 R08: 0000000000000010 R09: 0000000000401c60 [ 31.768019] R10: 0000000020000000 R11: 0000000000000202 R12: 0000000000401bd0 [ 31.775265] R13: 0000000000401c60 R14: 0000000000000000 R15: 0000000000000000 [ 31.783099] Dumping ftrace buffer: [ 31.786736] (ftrace buffer empty) [ 31.790427] Kernel Offset: disabled [ 31.794035] Rebooting in 86400 seconds..