[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.147377] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.386460] random: sshd: uninitialized urandom read (32 bytes read) [ 17.721133] random: sshd: uninitialized urandom read (32 bytes read) [ 18.410309] random: sshd: uninitialized urandom read (32 bytes read) [ 18.542892] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. [ 23.946515] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.027100] WARNING: CPU: 1 PID: 4451 at include/net/sock.h:660 smc_unhash_sk+0x357/0x4b0 [ 24.035454] Kernel panic - not syncing: panic_on_warn set ... [ 24.035454] [ 24.042846] CPU: 1 PID: 4451 Comm: syz-executor962 Not tainted 4.18.0-rc3+ #113 [ 24.050300] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.059633] Call Trace: [ 24.062207] dump_stack+0x1c9/0x2b4 [ 24.065814] ? dump_stack_print_info.cold.2+0x52/0x52 [ 24.071015] panic+0x238/0x4e7 [ 24.074205] ? add_taint.cold.5+0x16/0x16 [ 24.078348] ? __warn.cold.8+0x148/0x1ba [ 24.082387] ? __warn.cold.8+0x117/0x1ba [ 24.086430] ? smc_unhash_sk+0x357/0x4b0 [ 24.090479] __warn.cold.8+0x163/0x1ba [ 24.094346] ? smc_unhash_sk+0x357/0x4b0 [ 24.098397] report_bug+0x252/0x2d0 [ 24.102004] do_error_trap+0x1fc/0x4d0 [ 24.105880] ? math_error+0x3e0/0x3e0 [ 24.109922] ? kasan_check_write+0x14/0x20 [ 24.114140] ? do_raw_spin_lock+0xc1/0x200 [ 24.118362] ? lock_acquire+0x1e4/0x540 [ 24.122328] ? smc_unhash_sk+0xd7/0x4b0 [ 24.126283] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.131104] do_invalid_op+0x1b/0x20 [ 24.134797] invalid_op+0x14/0x20 [ 24.138230] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 24.143322] 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 39 a8 18 fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 13 81 56 fa [ 24.162443] RSP: 0018:ffff8801ac977480 EFLAGS: 00010293 [ 24.167787] RAX: ffff8801acbb6700 RBX: ffff8801ac4e7140 RCX: ffffffff876362d6 [ 24.175038] RDX: 0000000000000000 RSI: ffffffff87636397 RDI: 0000000000000005 [ 24.182287] RBP: ffff8801ac977568 R08: ffff8801acbb6700 R09: ffffed003589ce38 [ 24.189538] R10: ffffed003589ce38 R11: ffff8801ac4e71c3 R12: 1ffff1003592ee94 [ 24.196787] R13: ffff8801ac977540 R14: ffffffff89937b60 R15: ffff8801ac4e71c0 [ 24.204053] ? smc_unhash_sk+0x296/0x4b0 [ 24.208105] ? smc_unhash_sk+0x357/0x4b0 [ 24.212153] ? smc_rx_data_available+0x120/0x120 [ 24.216890] ? release_sock+0x1ec/0x2c0 [ 24.220844] ? do_raw_write_trylock+0x1c0/0x1c0 [ 24.225498] ? __release_sock+0x3a0/0x3a0 [ 24.229623] ? smc_release+0x2cb/0x680 [ 24.233492] ? trace_hardirqs_on+0xd/0x10 [ 24.237619] ? __local_bh_enable_ip+0x161/0x230 [ 24.242272] smc_release+0x3d1/0x680 [ 24.245968] __sock_release+0xd7/0x260 [ 24.249836] ? __sock_release+0x260/0x260 [ 24.253963] sock_close+0x19/0x20 [ 24.257401] __fput+0x355/0x8b0 [ 24.260659] ? fput+0x1a0/0x1a0 [ 24.263921] ? kasan_check_write+0x14/0x20 [ 24.268137] ? do_raw_spin_lock+0xc1/0x200 [ 24.272362] ____fput+0x15/0x20 [ 24.275623] task_work_run+0x1ec/0x2a0 [ 24.279496] ? task_work_cancel+0x250/0x250 [ 24.283800] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 24.289318] ? switch_task_namespaces+0xa2/0xd0 [ 24.293964] do_exit+0x1b08/0x2750 [ 24.297483] ? __sys_sendmsg+0x11d/0x290 [ 24.301531] ? __x64_sys_sendmsg+0x78/0xb0 [ 24.305747] ? mm_update_next_owner+0x9a0/0x9a0 [ 24.310406] ? do_raw_spin_unlock+0xa7/0x2f0 [ 24.314794] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 24.319375] ? kasan_check_write+0x14/0x20 [ 24.323588] ? do_raw_spin_lock+0xc1/0x200 [ 24.327805] ? trace_hardirqs_off+0xd/0x10 [ 24.332035] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 24.337129] ? debug_check_no_obj_freed+0x30b/0x595 [ 24.342127] ? trace_hardirqs_off+0xd/0x10 [ 24.346349] ? quarantine_put+0x10d/0x1b0 [ 24.350485] ? __kasan_slab_free+0x131/0x170 [ 24.354884] ? trace_hardirqs_on+0xd/0x10 [ 24.359020] ? ___sys_sendmsg+0x318/0x930 [ 24.363163] ? lock_acquire+0x1e4/0x540 [ 24.367116] ? __fd_install+0x2b2/0x880 [ 24.371080] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 24.376610] ? __fget_light+0x2f7/0x440 [ 24.380563] ? lock_acquire+0x1e4/0x540 [ 24.384527] ? fget_raw+0x20/0x20 [ 24.387956] ? lock_release+0xa30/0xa30 [ 24.391911] ? lock_downgrade+0x8f0/0x8f0 [ 24.396058] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 24.401599] ? sockfd_lookup_light+0xc5/0x160 [ 24.406087] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 24.411612] ? __sys_sendmsg+0x1ba/0x290 [ 24.415656] ? __ia32_sys_shutdown+0x80/0x80 [ 24.420051] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 24.425569] ? __do_page_fault+0x449/0xe50 [ 24.429785] do_group_exit+0x177/0x440 [ 24.433653] ? __ia32_sys_exit+0x50/0x50 [ 24.437704] __x64_sys_exit_group+0x3e/0x50 [ 24.442024] do_syscall_64+0x1b9/0x820 [ 24.445898] ? syscall_return_slowpath+0x5e0/0x5e0 [ 24.450819] ? syscall_return_slowpath+0x31d/0x5e0 [ 24.455726] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 24.460723] ? prepare_exit_to_usermode+0x291/0x3b0 [ 24.465726] ? perf_trace_sys_enter+0xb10/0xb10 [ 24.470382] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.475207] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 24.480376] RIP: 0033:0x43ef38 [ 24.483547] Code: Bad RIP value. [ 24.486899] RSP: 002b:00007fff83c1dec8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 24.494583] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ef38 [ 24.501838] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 24.509086] RBP: 00000000004be7e8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 24.516344] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 24.523591] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 24.531521] Dumping ftrace buffer: [ 24.535050] (ftrace buffer empty) [ 24.538737] Kernel Offset: disabled [ 24.542339] Rebooting in 86400 seconds..