[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.770811] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.368747] random: sshd: uninitialized urandom read (32 bytes read) [ 18.662384] random: sshd: uninitialized urandom read (32 bytes read) [ 19.362483] random: sshd: uninitialized urandom read (32 bytes read) [ 19.496404] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 24.974743] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.057193] WARNING: CPU: 0 PID: 4454 at include/net/sock.h:660 smc_unhash_sk+0x357/0x4b0 [ 25.065549] Kernel panic - not syncing: panic_on_warn set ... [ 25.065549] [ 25.072905] CPU: 0 PID: 4454 Comm: syz-executor120 Not tainted 4.18.0-rc3+ #116 [ 25.080328] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.089657] Call Trace: [ 25.092231] dump_stack+0x1c9/0x2b4 [ 25.095840] ? dump_stack_print_info.cold.2+0x52/0x52 [ 25.101019] panic+0x238/0x4e7 [ 25.104199] ? add_taint.cold.5+0x16/0x16 [ 25.108325] ? __warn.cold.8+0x148/0x1ba [ 25.112379] ? __warn.cold.8+0x117/0x1ba [ 25.116422] ? smc_unhash_sk+0x357/0x4b0 [ 25.120478] __warn.cold.8+0x163/0x1ba [ 25.124350] ? smc_unhash_sk+0x357/0x4b0 [ 25.128392] report_bug+0x252/0x2d0 [ 25.131997] do_error_trap+0x1fc/0x4d0 [ 25.135869] ? math_error+0x3e0/0x3e0 [ 25.139647] ? kasan_check_write+0x14/0x20 [ 25.143861] ? do_raw_spin_lock+0xc1/0x200 [ 25.148080] ? lock_acquire+0x1e4/0x540 [ 25.152049] ? smc_unhash_sk+0xd7/0x4b0 [ 25.156018] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.160845] do_invalid_op+0x1b/0x20 [ 25.164538] invalid_op+0x14/0x20 [ 25.167977] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 25.172616] 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 [ 25.191750] RSP: 0018:ffff8801ad757480 EFLAGS: 00010293 [ 25.197097] RAX: ffff8801ac4ee600 RBX: ffff8801acbc7140 RCX: ffffffff87638a16 [ 25.204349] RDX: 0000000000000000 RSI: ffffffff87638ad7 RDI: 0000000000000005 [ 25.211604] RBP: ffff8801ad757568 R08: ffff8801ac4ee600 R09: ffffed0035978e38 [ 25.218852] R10: ffffed0035978e38 R11: ffff8801acbc71c3 R12: 1ffff10035aeae94 [ 25.226112] R13: ffff8801ad757540 R14: ffffffff89937be0 R15: ffff8801acbc71c0 [ 25.233395] ? smc_unhash_sk+0x296/0x4b0 [ 25.237436] ? smc_unhash_sk+0x357/0x4b0 [ 25.241479] ? smc_rx_data_available+0x120/0x120 [ 25.246212] ? release_sock+0x1ec/0x2c0 [ 25.250167] ? do_raw_write_trylock+0x1c0/0x1c0 [ 25.254821] ? __release_sock+0x3a0/0x3a0 [ 25.258948] ? smc_release+0x2cb/0x680 [ 25.262822] ? trace_hardirqs_on+0xd/0x10 [ 25.266952] ? __local_bh_enable_ip+0x161/0x230 [ 25.271605] smc_release+0x3d1/0x680 [ 25.275302] __sock_release+0xd7/0x260 [ 25.279169] ? __sock_release+0x260/0x260 [ 25.283292] sock_close+0x19/0x20 [ 25.286726] __fput+0x355/0x8b0 [ 25.289986] ? fput+0x1a0/0x1a0 [ 25.293249] ? kasan_check_write+0x14/0x20 [ 25.297472] ? do_raw_spin_lock+0xc1/0x200 [ 25.301685] ____fput+0x15/0x20 [ 25.304948] task_work_run+0x1ec/0x2a0 [ 25.308820] ? task_work_cancel+0x250/0x250 [ 25.313123] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 25.318653] ? switch_task_namespaces+0xa2/0xd0 [ 25.323305] do_exit+0x1b08/0x2750 [ 25.326828] ? lock_downgrade+0x8a1/0x8f0 [ 25.330957] ? mm_update_next_owner+0x9a0/0x9a0 [ 25.335607] ? kasan_check_read+0x11/0x20 [ 25.339736] ? do_raw_spin_unlock+0xa7/0x2f0 [ 25.344122] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 25.348692] ? release_sock+0x1ec/0x2c0 [ 25.352646] ? trace_hardirqs_on+0xd/0x10 [ 25.356773] ? __local_bh_enable_ip+0x161/0x230 [ 25.361421] ? _raw_spin_unlock_bh+0x30/0x40 [ 25.365815] ? release_sock+0x1ec/0x2c0 [ 25.369772] ? __release_sock+0x3a0/0x3a0 [ 25.373920] ? __local_bh_enable_ip+0x161/0x230 [ 25.378570] ? smc_sendmsg+0x2d5/0x370 [ 25.382434] ? smc_sendpage+0x1a0/0x1a0 [ 25.386390] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.391911] ? kfree+0x15e/0x260 [ 25.395269] ? ___sys_sendmsg+0x318/0x930 [ 25.399398] ? lock_acquire+0x1e4/0x540 [ 25.403348] ? __fd_install+0x2b2/0x880 [ 25.407344] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.412859] ? __fget_light+0x2f7/0x440 [ 25.416819] ? lock_acquire+0x1e4/0x540 [ 25.420781] ? fget_raw+0x20/0x20 [ 25.424210] ? lock_release+0xa30/0xa30 [ 25.428164] ? lock_release+0xa30/0xa30 [ 25.432116] ? mem_cgroup_from_task+0xcb/0x1f0 [ 25.436679] ? __do_page_fault+0x664/0xe50 [ 25.440893] ? lock_downgrade+0x8f0/0x8f0 [ 25.445127] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 25.450645] ? sockfd_lookup_light+0xc5/0x160 [ 25.455119] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.460636] ? __sys_sendmsg+0x1ba/0x290 [ 25.464688] ? __ia32_sys_shutdown+0x80/0x80 [ 25.469077] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 25.474595] ? __do_page_fault+0x449/0xe50 [ 25.478812] do_group_exit+0x177/0x440 [ 25.482677] ? __ia32_sys_exit+0x50/0x50 [ 25.486718] __x64_sys_exit_group+0x3e/0x50 [ 25.491026] do_syscall_64+0x1b9/0x820 [ 25.494896] ? syscall_return_slowpath+0x5e0/0x5e0 [ 25.499802] ? syscall_return_slowpath+0x31d/0x5e0 [ 25.504711] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 25.509705] ? prepare_exit_to_usermode+0x291/0x3b0 [ 25.514707] ? perf_trace_sys_enter+0xb10/0xb10 [ 25.519355] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.524189] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 25.529359] RIP: 0033:0x43ecf8 [ 25.532533] Code: Bad RIP value. [ 25.535888] RSP: 002b:00007ffcdaa757d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 25.543573] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ecf8 [ 25.550821] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 25.558079] RBP: 00000000004be5a8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 25.565327] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 25.572575] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 25.580428] Dumping ftrace buffer: [ 25.583950] (ftrace buffer empty) [ 25.587636] Kernel Offset: disabled [ 25.591240] Rebooting in 86400 seconds..