[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.821870] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.226678] random: sshd: uninitialized urandom read (32 bytes read) [ 20.546537] random: sshd: uninitialized urandom read (32 bytes read) [ 21.325071] random: sshd: uninitialized urandom read (32 bytes read) [ 21.461781] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 27.074111] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.162077] WARNING: CPU: 0 PID: 4479 at include/net/sock.h:660 smc_unhash_sk+0x357/0x4b0 [ 27.170433] Kernel panic - not syncing: panic_on_warn set ... [ 27.170433] [ 27.177791] CPU: 0 PID: 4479 Comm: syz-executor720 Not tainted 4.18.0-rc3+ #116 [ 27.185218] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.194563] Call Trace: [ 27.197139] dump_stack+0x1c9/0x2b4 [ 27.200749] ? dump_stack_print_info.cold.2+0x52/0x52 [ 27.205931] panic+0x238/0x4e7 [ 27.209112] ? add_taint.cold.5+0x16/0x16 [ 27.213245] ? __warn.cold.8+0x148/0x1ba [ 27.217291] ? __warn.cold.8+0x117/0x1ba [ 27.221350] ? smc_unhash_sk+0x357/0x4b0 [ 27.225398] __warn.cold.8+0x163/0x1ba [ 27.229271] ? smc_unhash_sk+0x357/0x4b0 [ 27.233319] report_bug+0x252/0x2d0 [ 27.236929] do_error_trap+0x1fc/0x4d0 [ 27.240797] ? math_error+0x3e0/0x3e0 [ 27.244585] ? kasan_check_write+0x14/0x20 [ 27.248803] ? do_raw_spin_lock+0xc1/0x200 [ 27.253034] ? lock_acquire+0x1e4/0x540 [ 27.256997] ? smc_unhash_sk+0xd7/0x4b0 [ 27.260961] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.265787] do_invalid_op+0x1b/0x20 [ 27.269485] invalid_op+0x14/0x20 [ 27.272927] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 27.277573] 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 f9 80 18 fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 d3 59 56 fa [ 27.296722] RSP: 0018:ffff8801ab527480 EFLAGS: 00010293 [ 27.302094] RAX: ffff8801abf48040 RBX: ffff8801abe55140 RCX: ffffffff87638a16 [ 27.309381] RDX: 0000000000000000 RSI: ffffffff87638ad7 RDI: 0000000000000005 [ 27.316646] RBP: ffff8801ab527568 R08: ffff8801abf48040 R09: ffffed00357caa38 [ 27.323903] R10: ffffed00357caa38 R11: ffff8801abe551c3 R12: 1ffff100356a4e94 [ 27.331167] R13: ffff8801ab527540 R14: ffffffff89937be0 R15: ffff8801abe551c0 [ 27.338435] ? smc_unhash_sk+0x296/0x4b0 [ 27.342480] ? smc_unhash_sk+0x357/0x4b0 [ 27.346534] ? smc_rx_data_available+0x120/0x120 [ 27.351274] ? release_sock+0x1ec/0x2c0 [ 27.355231] ? do_raw_write_trylock+0x1c0/0x1c0 [ 27.359888] ? __release_sock+0x3a0/0x3a0 [ 27.364032] ? smc_release+0x2cb/0x680 [ 27.367911] ? trace_hardirqs_on+0xd/0x10 [ 27.372044] ? __local_bh_enable_ip+0x161/0x230 [ 27.376699] smc_release+0x3d1/0x680 [ 27.380399] __sock_release+0xd7/0x260 [ 27.384272] ? __sock_release+0x260/0x260 [ 27.388412] sock_close+0x19/0x20 [ 27.391850] __fput+0x355/0x8b0 [ 27.395120] ? fput+0x1a0/0x1a0 [ 27.398382] ? kasan_check_write+0x14/0x20 [ 27.402600] ? do_raw_spin_lock+0xc1/0x200 [ 27.406818] ____fput+0x15/0x20 [ 27.410080] task_work_run+0x1ec/0x2a0 [ 27.413963] ? task_work_cancel+0x250/0x250 [ 27.418271] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 27.423802] ? switch_task_namespaces+0xa2/0xd0 [ 27.428452] do_exit+0x1b08/0x2750 [ 27.431977] ? mm_update_next_owner+0x9a0/0x9a0 [ 27.436633] ? trace_hardirqs_on+0x10/0x10 [ 27.440860] ? trace_hardirqs_on+0x10/0x10 [ 27.445084] ? __thp_get_unmapped_area+0x180/0x180 [ 27.449996] ? lock_downgrade+0x8f0/0x8f0 [ 27.454134] ? lock_acquire+0x1e4/0x540 [ 27.458091] ? fs_reclaim_acquire+0x20/0x20 [ 27.462398] ? __lockdep_init_map+0x105/0x590 [ 27.466874] ? pud_val+0x88/0x100 [ 27.470309] ? pmd_val+0x100/0x100 [ 27.473834] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.479359] ? __handle_mm_fault+0x94b/0x4460 [ 27.483856] ? vmf_insert_mixed_mkwrite+0xa0/0xa0 [ 27.488689] ? release_sock+0x1ec/0x2c0 [ 27.492649] ? lock_downgrade+0x8f0/0x8f0 [ 27.496782] ? kasan_check_read+0x11/0x20 [ 27.500915] ? do_raw_spin_unlock+0xa7/0x2f0 [ 27.505311] ? release_sock+0x1ec/0x2c0 [ 27.509281] ? trace_hardirqs_on+0xd/0x10 [ 27.513414] ? __local_bh_enable_ip+0x161/0x230 [ 27.518072] ? _raw_spin_unlock_bh+0x30/0x40 [ 27.522465] ? release_sock+0x1ec/0x2c0 [ 27.526427] ? kasan_check_write+0x14/0x20 [ 27.530645] ? __release_sock+0x3a0/0x3a0 [ 27.534774] ? __local_bh_enable_ip+0x161/0x230 [ 27.539431] ? smc_setsockopt+0x388/0x6e0 [ 27.543574] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 27.549101] ? __sys_setsockopt+0x257/0x3b0 [ 27.553407] do_group_exit+0x177/0x440 [ 27.557279] ? mm_fault_error+0x380/0x380 [ 27.561412] ? __ia32_sys_exit+0x50/0x50 [ 27.565459] __x64_sys_exit_group+0x3e/0x50 [ 27.569771] do_syscall_64+0x1b9/0x820 [ 27.573645] ? syscall_return_slowpath+0x5e0/0x5e0 [ 27.578559] ? syscall_return_slowpath+0x31d/0x5e0 [ 27.583475] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 27.588483] ? prepare_exit_to_usermode+0x291/0x3b0 [ 27.593487] ? perf_trace_sys_enter+0xb10/0xb10 [ 27.598151] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 27.602983] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 27.608157] RIP: 0033:0x43ec78 [ 27.611326] Code: Bad RIP value. [ 27.614683] RSP: 002b:00007ffc7bb2c7c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 27.622372] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ec78 [ 27.629628] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 27.636883] RBP: 00000000004be528 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 27.644149] R10: 0000000020000240 R11: 0000000000000246 R12: 0000000000000001 [ 27.651407] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 27.659172] Dumping ftrace buffer: [ 27.662698] (ftrace buffer empty) [ 27.666391] Kernel Offset: disabled [ 27.670000] Rebooting in 86400 seconds..