[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.796339] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.100814] random: sshd: uninitialized urandom read (32 bytes read) [ 18.456489] random: sshd: uninitialized urandom read (32 bytes read) [ 19.214847] random: sshd: uninitialized urandom read (32 bytes read) [ 19.349066] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.46' (ECDSA) to the list of known hosts. [ 24.894209] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.975101] WARNING: CPU: 1 PID: 4461 at include/net/sock.h:660 smc_unhash_sk+0x357/0x4b0 [ 24.983441] Kernel panic - not syncing: panic_on_warn set ... [ 24.983441] [ 24.990800] CPU: 1 PID: 4461 Comm: syz-executor023 Not tainted 4.18.0-rc3+ #129 [ 24.998227] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.007559] Call Trace: [ 25.010136] dump_stack+0x1c9/0x2b4 [ 25.013779] ? dump_stack_print_info.cold.2+0x52/0x52 [ 25.018955] panic+0x238/0x4e7 [ 25.022132] ? add_taint.cold.5+0x16/0x16 [ 25.026262] ? __warn.cold.8+0x148/0x1ba [ 25.030321] ? __warn.cold.8+0x117/0x1ba [ 25.034366] ? smc_unhash_sk+0x357/0x4b0 [ 25.038423] __warn.cold.8+0x163/0x1ba [ 25.042297] ? smc_unhash_sk+0x357/0x4b0 [ 25.046337] report_bug+0x252/0x2d0 [ 25.049947] do_error_trap+0x1fc/0x4d0 [ 25.053826] ? math_error+0x3e0/0x3e0 [ 25.057610] ? kasan_check_write+0x14/0x20 [ 25.061832] ? do_raw_spin_lock+0xc1/0x200 [ 25.066061] ? lock_acquire+0x1e4/0x540 [ 25.070026] ? smc_unhash_sk+0xd7/0x4b0 [ 25.074014] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.078846] do_invalid_op+0x1b/0x20 [ 25.082539] invalid_op+0x14/0x20 [ 25.085982] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 25.090625] Code: 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 88 00 00 00 48 81 c4 c0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 89 1c 18 fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 63 f5 55 fa [ 25.109747] RSP: 0018:ffff8801ce777480 EFLAGS: 00010293 [ 25.115099] RAX: ffff8801ac8b2580 RBX: ffff8801acf5b140 RCX: ffffffff8763ee86 [ 25.122359] RDX: 0000000000000000 RSI: ffffffff8763ef47 RDI: 0000000000000005 [ 25.129609] RBP: ffff8801ce777568 R08: ffff8801ac8b2580 R09: ffffed00359eb638 [ 25.136859] R10: ffffed00359eb638 R11: ffff8801acf5b1c3 R12: 1ffff10039ceee94 [ 25.144110] R13: ffff8801ce777540 R14: ffffffff89938760 R15: ffff8801acf5b1c0 [ 25.151381] ? smc_unhash_sk+0x296/0x4b0 [ 25.155425] ? smc_unhash_sk+0x357/0x4b0 [ 25.159471] ? smc_rx_data_available+0x120/0x120 [ 25.164207] ? release_sock+0x1ec/0x2c0 [ 25.168161] ? do_raw_write_trylock+0x1c0/0x1c0 [ 25.172817] ? __release_sock+0x3a0/0x3a0 [ 25.176946] ? smc_release+0x2cb/0x680 [ 25.180816] ? trace_hardirqs_on+0xd/0x10 [ 25.184945] ? __local_bh_enable_ip+0x161/0x230 [ 25.189598] smc_release+0x3d1/0x680 [ 25.193303] __sock_release+0xd7/0x260 [ 25.197173] ? __sock_release+0x260/0x260 [ 25.201311] sock_close+0x19/0x20 [ 25.204747] __fput+0x355/0x8b0 [ 25.208007] ? fput+0x1a0/0x1a0 [ 25.211279] ? kasan_check_write+0x14/0x20 [ 25.215502] ? do_raw_spin_lock+0xc1/0x200 [ 25.219724] ____fput+0x15/0x20 [ 25.222985] task_work_run+0x1ec/0x2a0 [ 25.226857] ? task_work_cancel+0x250/0x250 [ 25.231167] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 25.236689] ? switch_task_namespaces+0xa2/0xd0 [ 25.241362] do_exit+0x1b08/0x2750 [ 25.244896] ? mm_update_next_owner+0x9a0/0x9a0 [ 25.249548] ? trace_hardirqs_on+0x10/0x10 [ 25.253773] ? trace_hardirqs_on+0x10/0x10 [ 25.257994] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 25.262563] ? kasan_check_write+0x14/0x20 [ 25.266785] ? do_raw_spin_lock+0xc1/0x200 [ 25.271005] ? _raw_spin_unlock+0x22/0x30 [ 25.275144] ? tcp_fastopen_reset_cipher+0x2a6/0x570 [ 25.280226] ? tcp_fastopen_ctx_destroy+0x260/0x260 [ 25.285248] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 25.290802] ? _copy_from_user+0xdf/0x150 [ 25.294939] ? do_tcp_setsockopt.isra.41+0x1fe/0x2620 [ 25.300150] ? release_sock+0x1ec/0x2c0 [ 25.304138] ? lock_downgrade+0x8f0/0x8f0 [ 25.308272] ? kasan_check_read+0x11/0x20 [ 25.312402] ? do_raw_spin_unlock+0xa7/0x2f0 [ 25.316795] ? release_sock+0x1ec/0x2c0 [ 25.320755] ? trace_hardirqs_on+0xd/0x10 [ 25.324891] ? __local_bh_enable_ip+0x161/0x230 [ 25.329543] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.333936] ? release_sock+0x1ec/0x2c0 [ 25.337894] ? kasan_check_write+0x14/0x20 [ 25.342113] ? __release_sock+0x3a0/0x3a0 [ 25.346244] ? __local_bh_enable_ip+0x161/0x230 [ 25.350898] ? smc_setsockopt+0x388/0x6e0 [ 25.355040] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.360561] ? __sys_setsockopt+0x257/0x3b0 [ 25.364893] do_group_exit+0x177/0x440 [ 25.368763] ? mm_fault_error+0x380/0x380 [ 25.372902] ? __ia32_sys_exit+0x50/0x50 [ 25.376959] __x64_sys_exit_group+0x3e/0x50 [ 25.381283] do_syscall_64+0x1b9/0x820 [ 25.385160] ? syscall_slow_exit_work+0x500/0x500 [ 25.389982] ? syscall_return_slowpath+0x5e0/0x5e0 [ 25.394900] ? syscall_return_slowpath+0x31d/0x5e0 [ 25.399833] ? prepare_exit_to_usermode+0x291/0x3b0 [ 25.404836] ? perf_trace_sys_enter+0xb10/0xb10 [ 25.409506] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.414334] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 25.419502] RIP: 0033:0x43ec88 [ 25.422666] Code: Bad RIP value. [ 25.426026] RSP: 002b:00007ffc1c5b3768 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 25.433722] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ec88 [ 25.440977] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 25.448239] RBP: 00000000004be548 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 25.455489] R10: 0000000020000040 R11: 0000000000000246 R12: 0000000000000001 [ 25.462738] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 25.470566] Dumping ftrace buffer: [ 25.474092] (ftrace buffer empty) [ 25.477798] Kernel Offset: disabled [ 25.481403] Rebooting in 86400 seconds..