[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.725122] random: sshd: uninitialized urandom read (32 bytes read) [ 18.799301] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.170392] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.043270] random: sshd: uninitialized urandom read (32 bytes read) [ 20.199607] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 25.673719] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.767826] WARNING: CPU: 0 PID: 4527 at include/net/sock.h:644 smc_unhash_sk+0x357/0x4b0 [ 25.776225] Kernel panic - not syncing: panic_on_warn set ... [ 25.776225] [ 25.783576] CPU: 0 PID: 4527 Comm: syz-executor544 Not tainted 4.18.0-rc4+ #144 [ 25.791005] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.800361] Call Trace: [ 25.802937] dump_stack+0x1c9/0x2b4 [ 25.806548] ? dump_stack_print_info.cold.2+0x52/0x52 [ 25.811729] panic+0x238/0x4e7 [ 25.814910] ? add_taint.cold.5+0x16/0x16 [ 25.819046] ? __warn.cold.8+0x148/0x1ba [ 25.823095] ? __warn.cold.8+0x117/0x1ba [ 25.827140] ? smc_unhash_sk+0x357/0x4b0 [ 25.832060] __warn.cold.8+0x163/0x1ba [ 25.835941] ? smc_unhash_sk+0x357/0x4b0 [ 25.839988] report_bug+0x252/0x2d0 [ 25.843606] do_error_trap+0x1fc/0x4d0 [ 25.847476] ? math_error+0x3e0/0x3e0 [ 25.851264] ? print_usage_bug+0xc0/0xc0 [ 25.855310] ? lock_acquire+0x1e4/0x540 [ 25.859270] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 25.864095] do_invalid_op+0x1b/0x20 [ 25.867795] invalid_op+0x14/0x20 [ 25.871231] RIP: 0010:smc_unhash_sk+0x357/0x4b0 [ 25.875874] 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 [ 25.895075] RSP: 0018:ffff8801af59f480 EFLAGS: 00010293 [ 25.900423] RAX: ffff8801caffc440 RBX: ffff8801afaa30c0 RCX: ffffffff8761b7f6 [ 25.907674] RDX: 0000000000000000 RSI: ffffffff8761b8b7 RDI: 0000000000000005 [ 25.914925] RBP: ffff8801af59f568 R08: ffff8801caffc440 R09: ffffed0035f54628 [ 25.922174] R10: ffffed0035f54628 R11: ffff8801afaa3143 R12: 1ffff10035eb3e94 [ 25.929424] R13: ffff8801af59f540 R14: ffffffff899372c0 R15: ffff8801afaa3140 [ 25.936940] ? smc_unhash_sk+0x296/0x4b0 [ 25.940989] ? smc_unhash_sk+0x357/0x4b0 [ 25.945049] ? smc_rx_data_available+0x120/0x120 [ 25.949791] ? release_sock+0x1ec/0x2c0 [ 25.953752] ? __local_bh_enable_ip+0x161/0x230 [ 25.958412] ? __release_sock+0x3a0/0x3a0 [ 25.962550] ? smc_release+0x2c9/0x670 [ 25.966422] ? trace_hardirqs_on+0xd/0x10 [ 25.970559] ? __local_bh_enable_ip+0x161/0x230 [ 25.975224] smc_release+0x3cf/0x670 [ 25.978943] __sock_release+0xd7/0x260 [ 25.982811] ? __sock_release+0x260/0x260 [ 25.986949] sock_close+0x19/0x20 [ 25.990387] __fput+0x355/0x8b0 [ 25.993658] ? fput+0x1a0/0x1a0 [ 25.996922] ? _raw_spin_unlock_irq+0x27/0x70 [ 26.001399] ____fput+0x15/0x20 [ 26.004659] task_work_run+0x1ec/0x2a0 [ 26.008539] ? task_work_cancel+0x250/0x250 [ 26.012847] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 26.018377] ? switch_task_namespaces+0xa2/0xd0 [ 26.023040] do_exit+0x1b08/0x2750 [ 26.026577] ? lock_downgrade+0x8d1/0x8f0 [ 26.030727] ? mm_update_next_owner+0x9a0/0x9a0 [ 26.035378] ? kasan_check_read+0x11/0x20 [ 26.039505] ? do_raw_spin_unlock+0xa7/0x2f0 [ 26.043903] ? __local_bh_enable_ip+0x161/0x230 [ 26.048561] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.053565] ? release_sock+0x1ec/0x2c0 [ 26.057520] ? trace_hardirqs_on+0xd/0x10 [ 26.061647] ? __local_bh_enable_ip+0x161/0x230 [ 26.066298] ? _raw_spin_unlock_bh+0x30/0x40 [ 26.070691] ? kasan_check_read+0x11/0x20 [ 26.074820] ? rcu_is_watching+0x8c/0x150 [ 26.078947] ? rcu_pm_notify+0xc0/0xc0 [ 26.082832] ? ___sys_sendmsg+0x313/0x930 [ 26.086971] ? rcu_read_lock_sched_held+0x108/0x120 [ 26.091977] ? kfree+0x1e9/0x260 [ 26.095323] ? ___sys_sendmsg+0x318/0x930 [ 26.099457] ? graph_lock+0x170/0x170 [ 26.103246] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.108762] ? __fget_light+0x2f7/0x440 [ 26.112728] ? fget_raw+0x20/0x20 [ 26.116171] ? lock_downgrade+0x8f0/0x8f0 [ 26.120299] ? handle_mm_fault+0x8c4/0xc80 [ 26.124530] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 26.130065] ? sockfd_lookup_light+0xc5/0x160 [ 26.134545] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.140065] ? __sys_sendmsg+0x1ba/0x290 [ 26.144118] ? __ia32_sys_shutdown+0x80/0x80 [ 26.148509] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.154033] ? __do_page_fault+0x449/0xe50 [ 26.158264] do_group_exit+0x177/0x440 [ 26.162136] ? __ia32_sys_exit+0x50/0x50 [ 26.166191] ? security_file_fcntl+0x94/0xc0 [ 26.170585] ? do_syscall_64+0x9a/0x820 [ 26.174550] __x64_sys_exit_group+0x3e/0x50 [ 26.178854] do_syscall_64+0x1b9/0x820 [ 26.182722] ? syscall_slow_exit_work+0x500/0x500 [ 26.187545] ? syscall_return_slowpath+0x5e0/0x5e0 [ 26.192454] ? syscall_return_slowpath+0x31d/0x5e0 [ 26.197365] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 26.202711] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.207538] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.212708] RIP: 0033:0x43edb8 [ 26.215873] Code: Bad RIP value. [ 26.219226] RSP: 002b:00007ffefb445b98 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 26.226913] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043edb8 [ 26.234177] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 26.241424] RBP: 00000000004be668 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 26.248672] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 26.255922] R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 [ 26.263819] Dumping ftrace buffer: [ 26.267446] (ftrace buffer empty) [ 26.271133] Kernel Offset: disabled [ 26.274739] Rebooting in 86400 seconds..