[....] Starting OpenBSD Secure Shell server: sshd[ 21.033338] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.117480] random: sshd: uninitialized urandom read (32 bytes read) [ 26.668427] sshd (4524) used greatest stack depth: 16648 bytes left [ 26.685207] random: sshd: uninitialized urandom read (32 bytes read) [ 27.423176] random: sshd: uninitialized urandom read (32 bytes read) [ 27.582603] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.43' (ECDSA) to the list of known hosts. [ 33.095083] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.200794] WARNING: CPU: 0 PID: 4540 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 33.209198] Kernel panic - not syncing: panic_on_warn set ... [ 33.209198] [ 33.216558] CPU: 0 PID: 4540 Comm: syz-executor892 Not tainted 4.17.0-rc3+ #36 [ 33.223928] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.233271] Call Trace: [ 33.235848] dump_stack+0x1b9/0x294 [ 33.240153] ? dump_stack_print_info.cold.2+0x52/0x52 [ 33.245326] ? smc_unhash_sk+0x320/0x4a0 [ 33.249366] panic+0x22f/0x4de [ 33.252537] ? add_taint.cold.5+0x16/0x16 [ 33.256665] ? __warn.cold.8+0x148/0x1b3 [ 33.260704] ? __warn.cold.8+0x117/0x1b3 [ 33.264744] ? smc_unhash_sk+0x345/0x4a0 [ 33.268784] __warn.cold.8+0x163/0x1b3 [ 33.272651] ? smc_unhash_sk+0x345/0x4a0 [ 33.276692] report_bug+0x252/0x2d0 [ 33.280318] do_error_trap+0x1de/0x490 [ 33.284184] ? graph_lock+0x170/0x170 [ 33.287963] ? math_error+0x420/0x420 [ 33.291747] ? lock_acquire+0x1dc/0x520 [ 33.295708] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.300531] do_invalid_op+0x1b/0x20 [ 33.304224] invalid_op+0x14/0x20 [ 33.307665] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 33.312307] RSP: 0018:ffff8801b2417488 EFLAGS: 00010293 [ 33.317652] RAX: ffff8801d96d8440 RBX: ffff8801d9b4f7c0 RCX: ffffffff873f756e [ 33.324908] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 33.332158] RBP: ffff8801b2417570 R08: ffff8801d96d8440 R09: ffffed003b369f08 [ 33.339408] R10: ffffed003b369f08 R11: ffff8801d9b4f843 R12: 1ffff10036482e95 [ 33.346659] R13: ffff8801b2417548 R14: ffffffff8970b1e0 R15: ffff8801d9b4f840 [ 33.353917] ? smc_unhash_sk+0x28e/0x4a0 [ 33.357956] ? smc_unhash_sk+0x345/0x4a0 [ 33.361999] ? smc_unhash_sk+0x345/0x4a0 [ 33.366057] ? smc_rx_data_available+0x100/0x100 [ 33.370802] ? release_sock+0x1e2/0x2b0 [ 33.374761] ? __local_bh_enable_ip+0x161/0x230 [ 33.379417] ? __release_sock+0x3a0/0x3a0 [ 33.383547] ? smc_release+0x269/0x610 [ 33.387416] ? trace_hardirqs_on+0xd/0x10 [ 33.391546] ? __local_bh_enable_ip+0x161/0x230 [ 33.396216] smc_release+0x36e/0x610 [ 33.399915] sock_release+0x96/0x1b0 [ 33.403616] ? sock_alloc_file+0x4e0/0x4e0 [ 33.407835] sock_close+0x16/0x20 [ 33.411274] __fput+0x34d/0x890 [ 33.414537] ? fput+0x1a0/0x1a0 [ 33.417805] ? _raw_spin_unlock_irq+0x27/0x70 [ 33.422298] ____fput+0x15/0x20 [ 33.425569] task_work_run+0x1e4/0x290 [ 33.429443] ? task_work_cancel+0x240/0x240 [ 33.433754] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 33.439281] ? switch_task_namespaces+0xa2/0xd0 [ 33.443962] do_exit+0x1aee/0x2730 [ 33.447521] ? mm_update_next_owner+0x980/0x980 [ 33.452197] ? find_held_lock+0x36/0x1c0 [ 33.456247] ? lock_downgrade+0x8e0/0x8e0 [ 33.460373] ? lock_downgrade+0x8e0/0x8e0 [ 33.464505] ? kasan_check_read+0x11/0x20 [ 33.468640] ? do_raw_spin_unlock+0x9e/0x2e0 [ 33.473041] ? __local_bh_enable_ip+0x161/0x230 [ 33.477691] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.482685] ? release_sock+0x1e2/0x2b0 [ 33.486638] ? trace_hardirqs_on+0xd/0x10 [ 33.490766] ? __local_bh_enable_ip+0x161/0x230 [ 33.495419] ? _raw_spin_unlock_bh+0x30/0x40 [ 33.499808] ? release_sock+0x1e2/0x2b0 [ 33.503763] ? __release_sock+0x3a0/0x3a0 [ 33.507896] ? __local_bh_enable_ip+0x161/0x230 [ 33.512558] ? lock_sock_nested+0xe7/0x120 [ 33.516776] ? smc_sendmsg+0x2d5/0x370 [ 33.520643] ? smc_sendpage+0x1a0/0x1a0 [ 33.524611] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.530138] ? sock_sendmsg+0x5a/0x120 [ 33.534015] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.539545] ? __sys_sendto+0x475/0x670 [ 33.543519] ? __ia32_sys_getpeername+0xb0/0xb0 [ 33.548191] ? lock_downgrade+0x8e0/0x8e0 [ 33.552332] ? handle_mm_fault+0x8c0/0xc70 [ 33.556562] ? handle_mm_fault+0x55a/0xc70 [ 33.560788] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.566312] do_group_exit+0x16f/0x430 [ 33.570182] ? __ia32_sys_exit+0x50/0x50 [ 33.574228] ? do_syscall_64+0x92/0x800 [ 33.578185] __x64_sys_exit_group+0x3e/0x50 [ 33.582487] do_syscall_64+0x1b1/0x800 [ 33.586366] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.591276] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.596198] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.601544] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.606372] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.611547] RIP: 0033:0x43e958 [ 33.614717] RSP: 002b:00007ffd4ca190a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.622408] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e958 [ 33.629680] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.636935] RBP: 00000000004be300 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 33.644186] R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000001 [ 33.651442] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 33.659317] Dumping ftrace buffer: [ 33.662957] (ftrace buffer empty) [ 33.666651] Kernel Offset: disabled [ 33.670260] Rebooting in 86400 seconds..