[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.429627] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.762739] random: sshd: uninitialized urandom read (32 bytes read) [ 26.189041] random: sshd: uninitialized urandom read (32 bytes read) [ 26.993749] random: sshd: uninitialized urandom read (32 bytes read) [ 27.169083] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 32.597119] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.696454] WARNING: CPU: 0 PID: 4563 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.705140] Kernel panic - not syncing: panic_on_warn set ... [ 32.705140] [ 32.712512] CPU: 0 PID: 4563 Comm: syz-executor096 Not tainted 4.17.0+ #89 [ 32.719701] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.729071] Call Trace: [ 32.731671] dump_stack+0x1b9/0x294 [ 32.735395] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.740620] ? smc_unhash_sk+0x2c0/0x4a0 [ 32.744694] panic+0x22f/0x4de [ 32.747906] ? add_taint.cold.5+0x16/0x16 [ 32.752078] ? __warn.cold.8+0x148/0x1b3 [ 32.757059] ? __warn.cold.8+0x117/0x1b3 [ 32.761148] ? smc_unhash_sk+0x345/0x4a0 [ 32.765366] __warn.cold.8+0x163/0x1b3 [ 32.769277] ? smc_unhash_sk+0x345/0x4a0 [ 32.773336] report_bug+0x252/0x2d0 [ 32.776964] do_error_trap+0x1fc/0x4d0 [ 32.780843] ? graph_lock+0x170/0x170 [ 32.784668] ? math_error+0x3f0/0x3f0 [ 32.788528] ? lock_acquire+0x1dc/0x520 [ 32.792518] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.797395] do_invalid_op+0x1b/0x20 [ 32.801130] invalid_op+0x14/0x20 [ 32.804623] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.809287] Code: 00 49 c7 44 24 08 00 00 00 00 41 c7 44 24 10 00 00 00 00 48 81 c4 c0 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 6b c4 29 fa <0f> 0b e9 51 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 55 f5 66 fa [ 32.828508] RSP: 0018:ffff8801d936f488 EFLAGS: 00010293 [ 32.833888] RAX: ffff8801d97e8400 RBX: ffff8801ad019800 RCX: ffffffff875075ce [ 32.841151] RDX: 0000000000000000 RSI: ffffffff87507685 RDI: 0000000000000005 [ 32.848460] RBP: ffff8801d936f570 R08: ffff8801d97e8400 R09: ffffed0035a03310 [ 32.855761] R10: ffffed0035a03310 R11: ffff8801ad019883 R12: 1ffff1003b26de95 [ 32.863223] R13: ffff8801d936f548 R14: ffffffff8992ae80 R15: ffff8801ad019880 [ 32.871068] ? smc_unhash_sk+0x28e/0x4a0 [ 32.875152] ? smc_unhash_sk+0x345/0x4a0 [ 32.879257] ? smc_unhash_sk+0x345/0x4a0 [ 32.883368] ? smc_rx_data_available+0x100/0x100 [ 32.888163] ? release_sock+0x1e2/0x2b0 [ 32.892157] ? __local_bh_enable_ip+0x161/0x230 [ 32.896855] ? __release_sock+0x3a0/0x3a0 [ 32.900997] ? smc_release+0x269/0x610 [ 32.904891] ? trace_hardirqs_on+0xd/0x10 [ 32.909056] ? __local_bh_enable_ip+0x161/0x230 [ 32.913742] smc_release+0x36e/0x610 [ 32.917479] sock_release+0x96/0x1b0 [ 32.921218] ? sock_alloc_file+0x4e0/0x4e0 [ 32.925467] sock_close+0x16/0x20 [ 32.928943] __fput+0x353/0x890 [ 32.932228] ? fput+0x1a0/0x1a0 [ 32.935513] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.940018] ____fput+0x15/0x20 [ 32.943293] task_work_run+0x1e4/0x290 [ 32.947192] ? task_work_cancel+0x240/0x240 [ 32.951508] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.957075] ? switch_task_namespaces+0xa2/0xd0 [ 32.961755] do_exit+0x1aee/0x2730 [ 32.965312] ? mm_update_next_owner+0x980/0x980 [ 32.969994] ? kasan_check_write+0x14/0x20 [ 32.974222] ? do_raw_spin_lock+0xc1/0x200 [ 32.978451] ? trace_hardirqs_off+0xd/0x10 [ 32.982683] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 32.987797] ? debug_check_no_obj_freed+0x2ff/0x584 [ 32.992913] ? __local_bh_enable_ip+0x161/0x230 [ 32.997686] ? kasan_check_read+0x11/0x20 [ 33.001859] ? rcu_is_watching+0x85/0x140 [ 33.006004] ? rcu_pm_notify+0xc0/0xc0 [ 33.009893] ? ___sys_sendmsg+0x31a/0x940 [ 33.014740] ? kfree+0x1e9/0x260 [ 33.018097] ? ___sys_sendmsg+0x31f/0x940 [ 33.022250] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.027802] ? copy_msghdr_from_user+0x560/0x560 [ 33.032566] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 33.037315] ? graph_lock+0x170/0x170 [ 33.041127] ? find_held_lock+0x36/0x1c0 [ 33.045193] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.050731] ? __fget_light+0x2ef/0x430 [ 33.054802] ? fget_raw+0x20/0x20 [ 33.058260] ? find_held_lock+0x36/0x1c0 [ 33.062366] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.067915] ? sockfd_lookup_light+0xc5/0x160 [ 33.072420] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.078111] ? __sys_sendmsg+0x1aa/0x270 [ 33.082190] ? __ia32_sys_shutdown+0x80/0x80 [ 33.086607] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.092150] ? __do_page_fault+0x441/0xe40 [ 33.096399] do_group_exit+0x16f/0x430 [ 33.100320] ? __ia32_sys_exit+0x50/0x50 [ 33.104403] ? do_syscall_64+0x92/0x800 [ 33.108390] __x64_sys_exit_group+0x3e/0x50 [ 33.112737] do_syscall_64+0x1b1/0x800 [ 33.116996] ? syscall_return_slowpath+0x5c0/0x5c0 [ 33.122043] ? syscall_return_slowpath+0x30f/0x5c0 [ 33.127027] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.132425] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.137492] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.142718] RIP: 0033:0x43ea48 [ 33.145925] Code: Bad RIP value. [ 33.149317] RSP: 002b:00007ffdd491cfd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.157028] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea48 [ 33.164317] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.171631] RBP: 00000000004be3e0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 33.179092] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 33.186365] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 33.194369] Dumping ftrace buffer: [ 33.198051] (ftrace buffer empty) [ 33.201756] Kernel Offset: disabled [ 33.205397] Rebooting in 86400 seconds..