[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.869096] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.310449] random: sshd: uninitialized urandom read (32 bytes read) [ 23.646278] random: sshd: uninitialized urandom read (32 bytes read) [ 24.517703] random: sshd: uninitialized urandom read (32 bytes read) [ 26.766467] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 32.530779] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.639974] WARNING: CPU: 1 PID: 4580 at include/net/sock.h:644 smc_unhash_sk+0x357/0x4b0 [ 32.648412] Kernel panic - not syncing: panic_on_warn set ... [ 32.648412] [ 32.655781] CPU: 1 PID: 4580 Comm: syz-executor059 Not tainted 4.18.0-rc4+ #140 [ 32.663232] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.672583] Call Trace: [ 32.675175] dump_stack+0x1c9/0x2b4 [ 32.678807] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.684000] panic+0x238/0x4e7 [ 32.687226] ? add_taint.cold.5+0x16/0x16 [ 32.691396] ? __warn.cold.8+0x148/0x1ba [ 32.695469] ? __warn.cold.8+0x117/0x1ba [ 32.699549] ? smc_unhash_sk+0x357/0x4b0 [ 32.703629] __warn.cold.8+0x163/0x1ba [ 32.707520] ? smc_unhash_sk+0x357/0x4b0 [ 32.711588] report_bug+0x252/0x2d0 [ 32.715235] do_error_trap+0x1fc/0x4d0 [ 32.719158] ? math_error+0x3e0/0x3e0 [ 32.722963] ? print_usage_bug+0xc0/0xc0 [ 32.727025] ? lock_acquire+0x1e4/0x540 [ 32.731001] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.735849] do_invalid_op+0x1b/0x20 [ 32.739555] invalid_op+0x14/0x20 [ 32.743018] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 32.747682] 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 e9 52 1a fa <0f> 0b e9 47 ff ff ff 4c 89 ff 48 89 85 28 ff ff ff e8 03 2d 58 fa [ 32.766884] RSP: 0018:ffff8801ce717480 EFLAGS: 00010293 [ 32.772252] RAX: ffff8801d888c140 RBX: ffff8801d8fcb0c0 RCX: ffffffff8761b7f6 [ 32.779522] RDX: 0000000000000000 RSI: ffffffff8761b8b7 RDI: 0000000000000005 [ 32.786812] RBP: ffff8801ce717568 R08: ffff8801d888c140 R09: ffffed003b1f9628 [ 32.794074] R10: ffffed003b1f9628 R11: ffff8801d8fcb143 R12: 1ffff10039ce2e94 [ 32.801329] R13: ffff8801ce717540 R14: ffffffff89937140 R15: ffff8801d8fcb140 [ 32.808600] ? smc_unhash_sk+0x296/0x4b0 [ 32.812667] ? smc_unhash_sk+0x357/0x4b0 [ 32.816719] ? smc_rx_data_available+0x120/0x120 [ 32.821461] ? release_sock+0x1ec/0x2c0 [ 32.825439] ? __local_bh_enable_ip+0x161/0x230 [ 32.830105] ? __release_sock+0x3a0/0x3a0 [ 32.834249] ? smc_release+0x2c9/0x670 [ 32.838244] ? trace_hardirqs_on+0xd/0x10 [ 32.842386] ? __local_bh_enable_ip+0x161/0x230 [ 32.847049] smc_release+0x3cf/0x670 [ 32.850758] __sock_release+0xd7/0x260 [ 32.854663] ? __sock_release+0x260/0x260 [ 32.858799] sock_close+0x19/0x20 [ 32.862257] __fput+0x355/0x8b0 [ 32.865631] ? fput+0x1a0/0x1a0 [ 32.868921] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.873435] ____fput+0x15/0x20 [ 32.876722] task_work_run+0x1ec/0x2a0 [ 32.880612] ? task_work_cancel+0x250/0x250 [ 32.884926] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.890455] ? switch_task_namespaces+0xa2/0xd0 [ 32.895116] do_exit+0x1b08/0x2750 [ 32.898645] ? __sys_sendmsg+0x11d/0x290 [ 32.902709] ? __x64_sys_sendmsg+0x78/0xb0 [ 32.906949] ? mm_update_next_owner+0x9a0/0x9a0 [ 32.911605] ? do_raw_spin_unlock+0xa7/0x2f0 [ 32.916018] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 32.920600] ? kasan_check_write+0x14/0x20 [ 32.924836] ? do_raw_spin_lock+0xc1/0x200 [ 32.929077] ? trace_hardirqs_off+0xd/0x10 [ 32.933332] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 32.938460] ? debug_check_no_obj_freed+0x30b/0x595 [ 32.943500] ? trace_hardirqs_off+0xd/0x10 [ 32.947755] ? quarantine_put+0x10d/0x1b0 [ 32.951895] ? kfree+0x111/0x260 [ 32.955281] ? ___sys_sendmsg+0x313/0x930 [ 32.959429] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.964434] ? trace_hardirqs_on+0xd/0x10 [ 32.968596] ? ___sys_sendmsg+0x318/0x930 [ 32.972741] ? graph_lock+0x170/0x170 [ 32.976564] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.982091] ? __fget_light+0x2f7/0x440 [ 32.986068] ? fget_raw+0x20/0x20 [ 32.989532] ? lock_downgrade+0x8f0/0x8f0 [ 32.993671] ? handle_mm_fault+0x8c4/0xc80 [ 32.997935] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 33.003485] ? sockfd_lookup_light+0xc5/0x160 [ 33.007997] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.013565] ? __sys_sendmsg+0x1ba/0x290 [ 33.017652] ? __ia32_sys_shutdown+0x80/0x80 [ 33.022600] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 33.028154] ? __do_page_fault+0x449/0xe50 [ 33.032402] do_group_exit+0x177/0x440 [ 33.036293] ? __ia32_sys_exit+0x50/0x50 [ 33.040373] ? do_syscall_64+0x9a/0x820 [ 33.044355] __x64_sys_exit_group+0x3e/0x50 [ 33.048691] do_syscall_64+0x1b9/0x820 [ 33.052589] ? syscall_return_slowpath+0x5e0/0x5e0 [ 33.057515] ? syscall_return_slowpath+0x31d/0x5e0 [ 33.062723] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 33.068102] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 33.072965] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 33.078169] RIP: 0033:0x43ef38 [ 33.081362] Code: Bad RIP value. [ 33.084752] RSP: 002b:00007fff7356b048 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 33.092462] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ef38 [ 33.099739] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 33.107001] RBP: 00000000004be7e8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 33.114268] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 33.121570] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 33.129751] Dumping ftrace buffer: [ 33.133474] (ftrace buffer empty) [ 33.137181] Kernel Offset: disabled [ 33.140803] Rebooting in 86400 seconds..