[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.387601] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.487780] random: sshd: uninitialized urandom read (32 bytes read) [ 25.040608] random: sshd: uninitialized urandom read (32 bytes read) [ 25.767901] random: sshd: uninitialized urandom read (32 bytes read) [ 25.923428] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. [ 31.402173] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.491973] WARNING: CPU: 0 PID: 4510 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 31.500361] Kernel panic - not syncing: panic_on_warn set ... [ 31.500361] [ 31.507708] CPU: 0 PID: 4510 Comm: syz-executor163 Not tainted 4.17.0-rc3+ #37 [ 31.515047] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.524379] Call Trace: [ 31.526946] dump_stack+0x1b9/0x294 [ 31.530552] ? dump_stack_print_info.cold.2+0x52/0x52 [ 31.535724] ? smc_unhash_sk+0x320/0x4a0 [ 31.539767] panic+0x22f/0x4de [ 31.542971] ? add_taint.cold.5+0x16/0x16 [ 31.547110] ? __warn.cold.8+0x148/0x1b3 [ 31.551152] ? __warn.cold.8+0x117/0x1b3 [ 31.555192] ? smc_unhash_sk+0x345/0x4a0 [ 31.559232] __warn.cold.8+0x163/0x1b3 [ 31.563097] ? smc_unhash_sk+0x345/0x4a0 [ 31.567144] report_bug+0x252/0x2d0 [ 31.570753] do_error_trap+0x1de/0x490 [ 31.574617] ? graph_lock+0x170/0x170 [ 31.578398] ? math_error+0x420/0x420 [ 31.582183] ? lock_acquire+0x1dc/0x520 [ 31.586137] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.590958] do_invalid_op+0x1b/0x20 [ 31.594649] invalid_op+0x14/0x20 [ 31.598086] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 31.602732] RSP: 0018:ffff8801d910f488 EFLAGS: 00010293 [ 31.608076] RAX: ffff8801aecca140 RBX: ffff8801ab8437c0 RCX: ffffffff873f756e [ 31.615334] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 31.622584] RBP: ffff8801d910f570 R08: ffff8801aecca140 R09: ffffed0035708708 [ 31.629831] R10: ffffed0035708708 R11: ffff8801ab843843 R12: 1ffff1003b221e95 [ 31.637078] R13: ffff8801d910f548 R14: ffffffff8970b1e0 R15: ffff8801ab843840 [ 31.644342] ? smc_unhash_sk+0x28e/0x4a0 [ 31.648385] ? smc_unhash_sk+0x345/0x4a0 [ 31.652427] ? smc_unhash_sk+0x345/0x4a0 [ 31.656472] ? smc_rx_data_available+0x100/0x100 [ 31.661209] ? release_sock+0x1e2/0x2b0 [ 31.665162] ? __local_bh_enable_ip+0x161/0x230 [ 31.669810] ? __release_sock+0x3a0/0x3a0 [ 31.673935] ? smc_release+0x269/0x610 [ 31.677802] ? trace_hardirqs_on+0xd/0x10 [ 31.681927] ? __local_bh_enable_ip+0x161/0x230 [ 31.686575] smc_release+0x36e/0x610 [ 31.690270] sock_release+0x96/0x1b0 [ 31.693963] ? sock_alloc_file+0x4e0/0x4e0 [ 31.698179] sock_close+0x16/0x20 [ 31.701625] __fput+0x34d/0x890 [ 31.704885] ? fput+0x1a0/0x1a0 [ 31.708148] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.712625] ____fput+0x15/0x20 [ 31.715884] task_work_run+0x1e4/0x290 [ 31.719751] ? task_work_cancel+0x240/0x240 [ 31.724054] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 31.729569] ? switch_task_namespaces+0xa2/0xd0 [ 31.734217] do_exit+0x1aee/0x2730 [ 31.737739] ? mm_update_next_owner+0x980/0x980 [ 31.742387] ? kasan_check_write+0x14/0x20 [ 31.746598] ? do_raw_spin_lock+0xc1/0x200 [ 31.750814] ? trace_hardirqs_off+0xd/0x10 [ 31.755039] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 31.760121] ? debug_check_no_obj_freed+0x2ff/0x584 [ 31.765118] ? __local_bh_enable_ip+0x161/0x230 [ 31.769770] ? kasan_check_read+0x11/0x20 [ 31.773897] ? rcu_is_watching+0x85/0x140 [ 31.778031] ? rcu_pm_notify+0xc0/0xc0 [ 31.781908] ? ___sys_sendmsg+0x31a/0x940 [ 31.786042] ? kfree+0x1e9/0x260 [ 31.789389] ? ___sys_sendmsg+0x31f/0x940 [ 31.793517] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.799044] ? copy_msghdr_from_user+0x560/0x560 [ 31.803782] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 31.808515] ? graph_lock+0x170/0x170 [ 31.812304] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.817825] ? __fget_light+0x2ef/0x430 [ 31.821778] ? fget_raw+0x20/0x20 [ 31.825212] ? find_held_lock+0x36/0x1c0 [ 31.829262] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 31.834781] ? sockfd_lookup_light+0xc5/0x160 [ 31.839257] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.844771] ? __sys_sendmsg+0x1aa/0x270 [ 31.848809] ? __ia32_sys_shutdown+0x80/0x80 [ 31.853201] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 31.858716] ? __do_page_fault+0x441/0xe40 [ 31.862934] do_group_exit+0x16f/0x430 [ 31.866805] ? __ia32_sys_exit+0x50/0x50 [ 31.870850] ? do_syscall_64+0x92/0x800 [ 31.874808] __x64_sys_exit_group+0x3e/0x50 [ 31.879109] do_syscall_64+0x1b1/0x800 [ 31.882975] ? syscall_return_slowpath+0x5c0/0x5c0 [ 31.887882] ? syscall_return_slowpath+0x30f/0x5c0 [ 31.892793] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 31.898225] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.903058] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 31.908234] RIP: 0033:0x43ea98 [ 31.911403] RSP: 002b:00007ffef0180a48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 31.919088] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea98 [ 31.926334] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 31.933582] RBP: 00000000004be440 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 31.940829] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 31.948076] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 31.955876] Dumping ftrace buffer: [ 31.959499] (ftrace buffer empty) [ 31.963186] Kernel Offset: disabled [ 31.966793] Rebooting in 86400 seconds..