[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.737237] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.354790] random: sshd: uninitialized urandom read (32 bytes read) [ 23.652230] random: sshd: uninitialized urandom read (32 bytes read) [ 24.485242] random: sshd: uninitialized urandom read (32 bytes read) [ 24.641687] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. [ 30.084445] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 30.175235] WARNING: CPU: 0 PID: 4521 at include/net/sock.h:644 smc_unhash_sk+0x357/0x4b0 [ 30.183644] Kernel panic - not syncing: panic_on_warn set ... [ 30.183644] [ 30.190992] CPU: 0 PID: 4521 Comm: syz-executor356 Not tainted 4.18.0-rc4+ #139 [ 30.198424] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.207756] Call Trace: [ 30.210331] dump_stack+0x1c9/0x2b4 [ 30.213940] ? dump_stack_print_info.cold.2+0x52/0x52 [ 30.219125] panic+0x238/0x4e7 [ 30.222348] ? add_taint.cold.5+0x16/0x16 [ 30.226482] ? __warn.cold.8+0x148/0x1ba [ 30.230525] ? __warn.cold.8+0x117/0x1ba [ 30.234573] ? smc_unhash_sk+0x357/0x4b0 [ 30.238616] __warn.cold.8+0x163/0x1ba [ 30.242489] ? smc_unhash_sk+0x357/0x4b0 [ 30.246539] report_bug+0x252/0x2d0 [ 30.250151] do_error_trap+0x1fc/0x4d0 [ 30.254025] ? math_error+0x3e0/0x3e0 [ 30.257815] ? print_usage_bug+0xc0/0xc0 [ 30.261858] ? lock_acquire+0x1e4/0x540 [ 30.265827] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.270651] do_invalid_op+0x1b/0x20 [ 30.274344] invalid_op+0x14/0x20 [ 30.277781] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 30.282424] 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 [ 30.301594] RSP: 0018:ffff8801af707480 EFLAGS: 00010293 [ 30.306936] RAX: ffff8801afb08680 RBX: ffff8801aed770c0 RCX: ffffffff8761b7f6 [ 30.314181] RDX: 0000000000000000 RSI: ffffffff8761b8b7 RDI: 0000000000000005 [ 30.321431] RBP: ffff8801af707568 R08: ffff8801afb08680 R09: ffffed0035daee28 [ 30.328689] R10: ffffed0035daee28 R11: ffff8801aed77143 R12: 1ffff10035ee0e94 [ 30.335940] R13: ffff8801af707540 R14: ffffffff89937140 R15: ffff8801aed77140 [ 30.343218] ? smc_unhash_sk+0x296/0x4b0 [ 30.347261] ? smc_unhash_sk+0x357/0x4b0 [ 30.351307] ? smc_rx_data_available+0x120/0x120 [ 30.356046] ? release_sock+0x1ec/0x2c0 [ 30.360014] ? __local_bh_enable_ip+0x161/0x230 [ 30.364673] ? __release_sock+0x3a0/0x3a0 [ 30.368801] ? smc_release+0x2c9/0x670 [ 30.372680] ? trace_hardirqs_on+0xd/0x10 [ 30.376815] ? __local_bh_enable_ip+0x161/0x230 [ 30.381468] smc_release+0x3cf/0x670 [ 30.385165] __sock_release+0xd7/0x260 [ 30.389039] ? __sock_release+0x260/0x260 [ 30.393166] sock_close+0x19/0x20 [ 30.396602] __fput+0x355/0x8b0 [ 30.399864] ? fput+0x1a0/0x1a0 [ 30.403125] ? _raw_spin_unlock_irq+0x27/0x70 [ 30.407604] ____fput+0x15/0x20 [ 30.410864] task_work_run+0x1ec/0x2a0 [ 30.414733] ? task_work_cancel+0x250/0x250 [ 30.419046] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 30.424569] ? switch_task_namespaces+0xa2/0xd0 [ 30.429219] do_exit+0x1b08/0x2750 [ 30.432739] ? __sys_sendmsg+0x11d/0x290 [ 30.436775] ? __x64_sys_sendmsg+0x78/0xb0 [ 30.440990] ? mm_update_next_owner+0x9a0/0x9a0 [ 30.445640] ? do_raw_spin_unlock+0xa7/0x2f0 [ 30.450038] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 30.454602] ? kasan_check_write+0x14/0x20 [ 30.458815] ? do_raw_spin_lock+0xc1/0x200 [ 30.463039] ? trace_hardirqs_off+0xd/0x10 [ 30.467265] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 30.472349] ? debug_check_no_obj_freed+0x30b/0x595 [ 30.477348] ? trace_hardirqs_off+0xd/0x10 [ 30.481562] ? quarantine_put+0x10d/0x1b0 [ 30.485691] ? kfree+0x111/0x260 [ 30.489044] ? ___sys_sendmsg+0x313/0x930 [ 30.493172] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 30.498174] ? trace_hardirqs_on+0xd/0x10 [ 30.502305] ? ___sys_sendmsg+0x318/0x930 [ 30.506437] ? graph_lock+0x170/0x170 [ 30.510226] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.515745] ? __fget_light+0x2f7/0x440 [ 30.519699] ? fget_raw+0x20/0x20 [ 30.523137] ? lock_downgrade+0x8f0/0x8f0 [ 30.527269] ? handle_mm_fault+0x8c4/0xc80 [ 30.531490] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 30.537023] ? sockfd_lookup_light+0xc5/0x160 [ 30.541505] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.547027] ? __sys_sendmsg+0x1ba/0x290 [ 30.551080] ? __ia32_sys_shutdown+0x80/0x80 [ 30.555472] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 30.560989] ? __do_page_fault+0x449/0xe50 [ 30.565208] do_group_exit+0x177/0x440 [ 30.569076] ? __ia32_sys_exit+0x50/0x50 [ 30.573118] ? do_syscall_64+0x9a/0x820 [ 30.577075] __x64_sys_exit_group+0x3e/0x50 [ 30.581378] do_syscall_64+0x1b9/0x820 [ 30.585254] ? syscall_return_slowpath+0x5e0/0x5e0 [ 30.590177] ? syscall_return_slowpath+0x31d/0x5e0 [ 30.595092] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 30.600438] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 30.605264] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 30.610431] RIP: 0033:0x43ef38 [ 30.613597] Code: Bad RIP value. [ 30.616951] RSP: 002b:00007ffc2398c6a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 30.624636] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ef38 [ 30.631884] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 30.639131] RBP: 00000000004be7e8 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 30.646384] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 [ 30.653636] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 30.661482] Dumping ftrace buffer: [ 30.665132] (ftrace buffer empty) [ 30.668819] Kernel Offset: disabled [ 30.672429] Rebooting in 86400 seconds..