[....] Starting OpenBSD Secure Shell server: sshd[ 18.568255] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.689927] random: sshd: uninitialized urandom read (32 bytes read) [ 22.906597] random: sshd: uninitialized urandom read (32 bytes read) [ 23.631168] sshd (4485) used greatest stack depth: 16376 bytes left [ 23.646812] random: sshd: uninitialized urandom read (32 bytes read) [ 37.318181] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 42.759477] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 42.870519] WARNING: CPU: 1 PID: 4501 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 42.878899] Kernel panic - not syncing: panic_on_warn set ... [ 42.878899] [ 42.886251] CPU: 1 PID: 4501 Comm: syz-executor797 Not tainted 4.17.0-rc3+ #33 [ 42.893586] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.902918] Call Trace: [ 42.905489] dump_stack+0x1b9/0x294 [ 42.909113] ? dump_stack_print_info.cold.2+0x52/0x52 [ 42.914286] ? smc_unhash_sk+0x270/0x4a0 [ 42.918324] panic+0x22f/0x4de [ 42.921497] ? add_taint.cold.5+0x16/0x16 [ 42.925626] ? __warn.cold.8+0x148/0x1b3 [ 42.929664] ? __warn.cold.8+0x117/0x1b3 [ 42.933705] ? smc_unhash_sk+0x345/0x4a0 [ 42.937745] __warn.cold.8+0x163/0x1b3 [ 42.941611] ? smc_unhash_sk+0x345/0x4a0 [ 42.945650] report_bug+0x252/0x2d0 [ 42.949256] do_error_trap+0x1de/0x490 [ 42.953121] ? graph_lock+0x170/0x170 [ 42.956900] ? math_error+0x420/0x420 [ 42.960681] ? lock_acquire+0x1dc/0x520 [ 42.964639] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 42.969461] do_invalid_op+0x1b/0x20 [ 42.973157] invalid_op+0x14/0x20 [ 42.976586] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 42.981231] RSP: 0018:ffff8801bb45f488 EFLAGS: 00010293 [ 42.986571] RAX: ffff8801d933a200 RBX: ffff8801ac9b37c0 RCX: ffffffff873fe71e [ 42.993818] RDX: 0000000000000000 RSI: ffffffff873fe7d5 RDI: 0000000000000005 [ 43.001076] RBP: ffff8801bb45f570 R08: ffff8801d933a200 R09: ffffed0035936708 [ 43.008323] R10: ffffed0035936708 R11: ffff8801ac9b3843 R12: 1ffff1003768be95 [ 43.015569] R13: ffff8801bb45f548 R14: ffffffff8970e4e0 R15: ffff8801ac9b3840 [ 43.022827] ? smc_unhash_sk+0x28e/0x4a0 [ 43.026884] ? smc_unhash_sk+0x345/0x4a0 [ 43.030927] ? smc_unhash_sk+0x345/0x4a0 [ 43.034968] ? smc_rx_data_available+0x100/0x100 [ 43.039704] ? release_sock+0x1e2/0x2b0 [ 43.043657] ? __local_bh_enable_ip+0x161/0x230 [ 43.048308] ? __release_sock+0x3a0/0x3a0 [ 43.052431] ? smc_release+0x269/0x610 [ 43.056298] ? trace_hardirqs_on+0xd/0x10 [ 43.060422] ? __local_bh_enable_ip+0x161/0x230 [ 43.065071] smc_release+0x36e/0x610 [ 43.068764] sock_release+0x96/0x1b0 [ 43.072456] ? sock_alloc_file+0x4e0/0x4e0 [ 43.076670] sock_close+0x16/0x20 [ 43.080103] __fput+0x34d/0x890 [ 43.083363] ? fput+0x1a0/0x1a0 [ 43.086630] ? _raw_spin_unlock_irq+0x27/0x70 [ 43.091104] ____fput+0x15/0x20 [ 43.094362] task_work_run+0x1e4/0x290 [ 43.098227] ? task_work_cancel+0x240/0x240 [ 43.102531] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 43.108045] ? switch_task_namespaces+0xa2/0xd0 [ 43.112692] do_exit+0x1aee/0x2730 [ 43.116214] ? mm_update_next_owner+0x980/0x980 [ 43.120863] ? find_held_lock+0x36/0x1c0 [ 43.124906] ? lock_downgrade+0x8e0/0x8e0 [ 43.129030] ? lock_downgrade+0x8e0/0x8e0 [ 43.133158] ? kasan_check_read+0x11/0x20 [ 43.137283] ? do_raw_spin_unlock+0x9e/0x2e0 [ 43.141672] ? __local_bh_enable_ip+0x161/0x230 [ 43.146320] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 43.151315] ? release_sock+0x1e2/0x2b0 [ 43.155266] ? trace_hardirqs_on+0xd/0x10 [ 43.159391] ? __local_bh_enable_ip+0x161/0x230 [ 43.164036] ? _raw_spin_unlock_bh+0x30/0x40 [ 43.168423] ? release_sock+0x1e2/0x2b0 [ 43.172376] ? __release_sock+0x3a0/0x3a0 [ 43.176503] ? __local_bh_enable_ip+0x161/0x230 [ 43.181153] ? lock_sock_nested+0xe7/0x120 [ 43.185367] ? smc_sendmsg+0x2d5/0x370 [ 43.189232] ? smc_sendpage+0x1a0/0x1a0 [ 43.193188] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.198710] ? sock_sendmsg+0x5a/0x120 [ 43.202578] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.208091] ? __sys_sendto+0x475/0x670 [ 43.212044] ? __ia32_sys_getpeername+0xb0/0xb0 [ 43.216693] ? lock_downgrade+0x8e0/0x8e0 [ 43.220821] ? handle_mm_fault+0x8c0/0xc70 [ 43.225038] ? handle_mm_fault+0x55a/0xc70 [ 43.229258] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 43.234790] do_group_exit+0x16f/0x430 [ 43.238654] ? mm_fault_error+0x380/0x380 [ 43.242779] ? __ia32_sys_exit+0x50/0x50 [ 43.246819] ? do_syscall_64+0x92/0x800 [ 43.250771] __x64_sys_exit_group+0x3e/0x50 [ 43.255071] do_syscall_64+0x1b1/0x800 [ 43.258939] ? syscall_return_slowpath+0x5c0/0x5c0 [ 43.263845] ? syscall_return_slowpath+0x30f/0x5c0 [ 43.268757] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 43.274100] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 43.278922] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 43.284086] RIP: 0033:0x43e918 [ 43.287255] RSP: 002b:00007fffa71bf678 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 43.294942] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043e918 [ 43.302188] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 43.309437] RBP: 00000000004be2c0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 43.316683] R10: 0000000020020003 R11: 0000000000000246 R12: 0000000000000001 [ 43.323928] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 43.331690] Dumping ftrace buffer: [ 43.335285] (ftrace buffer empty) [ 43.338972] Kernel Offset: disabled [ 43.342585] Rebooting in 86400 seconds..