[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 23.316275] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.808974] random: sshd: uninitialized urandom read (32 bytes read) [ 27.606735] random: sshd: uninitialized urandom read (32 bytes read) [ 28.453698] random: sshd: uninitialized urandom read (32 bytes read) [ 28.635559] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 34.123635] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 34.232811] WARNING: CPU: 1 PID: 4571 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 34.241372] Kernel panic - not syncing: panic_on_warn set ... [ 34.241372] [ 34.248750] CPU: 1 PID: 4571 Comm: syz-executor287 Not tainted 4.17.0-rc7+ #82 [ 34.256114] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.265473] Call Trace: [ 34.268095] dump_stack+0x1b9/0x294 [ 34.271765] ? dump_stack_print_info.cold.2+0x52/0x52 [ 34.276985] ? smc_unhash_sk+0x2f0/0x4a0 [ 34.281076] panic+0x22f/0x4de [ 34.284298] ? add_taint.cold.5+0x16/0x16 [ 34.288473] ? __warn.cold.8+0x148/0x1b3 [ 34.292566] ? __warn.cold.8+0x117/0x1b3 [ 34.296662] ? smc_unhash_sk+0x345/0x4a0 [ 34.300762] __warn.cold.8+0x163/0x1b3 [ 34.304680] ? smc_unhash_sk+0x345/0x4a0 [ 34.308767] report_bug+0x252/0x2d0 [ 34.312424] do_error_trap+0x1de/0x490 [ 34.316336] ? graph_lock+0x170/0x170 [ 34.320170] ? math_error+0x420/0x420 [ 34.323996] ? lock_acquire+0x1dc/0x520 [ 34.327998] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.332877] do_invalid_op+0x1b/0x20 [ 34.336604] invalid_op+0x14/0x20 [ 34.340072] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 34.344743] RSP: 0018:ffff8801ac38f488 EFLAGS: 00010293 [ 34.350124] RAX: ffff8801abbc8600 RBX: ffff8801d9b94800 RCX: ffffffff8749809e [ 34.357420] RDX: 0000000000000000 RSI: ffffffff87498155 RDI: 0000000000000005 [ 34.364702] RBP: ffff8801ac38f570 R08: ffff8801abbc8600 R09: ffffed003b372910 [ 34.372073] R10: ffffed003b372910 R11: ffff8801d9b94883 R12: 1ffff10035871e95 [ 34.379438] R13: ffff8801ac38f548 R14: ffffffff89720ce0 R15: ffff8801d9b94880 [ 34.386735] ? smc_unhash_sk+0x28e/0x4a0 [ 34.390800] ? smc_unhash_sk+0x345/0x4a0 [ 34.394860] ? smc_unhash_sk+0x345/0x4a0 [ 34.399047] ? smc_rx_data_available+0x100/0x100 [ 34.403824] ? release_sock+0x1e2/0x2b0 [ 34.407834] ? __local_bh_enable_ip+0x161/0x230 [ 34.412529] ? __release_sock+0x3a0/0x3a0 [ 34.416704] ? smc_release+0x269/0x610 [ 34.420610] ? trace_hardirqs_on+0xd/0x10 [ 34.424776] ? __local_bh_enable_ip+0x161/0x230 [ 34.429460] smc_release+0x36e/0x610 [ 34.433194] sock_release+0x96/0x1b0 [ 34.436931] ? sock_alloc_file+0x4e0/0x4e0 [ 34.441169] sock_close+0x16/0x20 [ 34.444618] __fput+0x34d/0x890 [ 34.447904] ? fput+0x1a0/0x1a0 [ 34.451196] ? _raw_spin_unlock_irq+0x27/0x70 [ 34.455702] ____fput+0x15/0x20 [ 34.458994] task_work_run+0x1e4/0x290 [ 34.462909] ? task_work_cancel+0x240/0x240 [ 34.467242] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 34.472802] ? switch_task_namespaces+0xa2/0xd0 [ 34.477505] do_exit+0x1aee/0x2730 [ 34.481172] ? mm_update_next_owner+0x980/0x980 [ 34.485858] ? kasan_check_write+0x14/0x20 [ 34.490117] ? do_raw_spin_lock+0xc1/0x200 [ 34.494396] ? trace_hardirqs_off+0xd/0x10 [ 34.498658] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 34.503800] ? debug_check_no_obj_freed+0x2ff/0x584 [ 34.508859] ? __local_bh_enable_ip+0x161/0x230 [ 34.513573] ? kasan_check_read+0x11/0x20 [ 34.517749] ? rcu_is_watching+0x85/0x140 [ 34.521915] ? rcu_pm_notify+0xc0/0xc0 [ 34.525825] ? ___sys_sendmsg+0x31a/0x940 [ 34.529998] ? kfree+0x1e9/0x260 [ 34.533395] ? ___sys_sendmsg+0x31f/0x940 [ 34.537557] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.543154] ? copy_msghdr_from_user+0x560/0x560 [ 34.547958] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 34.552747] ? graph_lock+0x170/0x170 [ 34.556576] ? find_held_lock+0x36/0x1c0 [ 34.560660] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.566212] ? __fget_light+0x2ef/0x430 [ 34.570203] ? fget_raw+0x20/0x20 [ 34.573697] ? find_held_lock+0x36/0x1c0 [ 34.577840] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 34.583427] ? sockfd_lookup_light+0xc5/0x160 [ 34.587959] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.593623] ? __sys_sendmsg+0x1aa/0x270 [ 34.597711] ? __ia32_sys_shutdown+0x80/0x80 [ 34.602176] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 34.607750] ? __do_page_fault+0x441/0xe40 [ 34.612028] do_group_exit+0x16f/0x430 [ 34.615967] ? __ia32_sys_exit+0x50/0x50 [ 34.620067] ? do_syscall_64+0x92/0x800 [ 34.624070] __x64_sys_exit_group+0x3e/0x50 [ 34.628418] do_syscall_64+0x1b1/0x800 [ 34.632326] ? syscall_return_slowpath+0x5c0/0x5c0 [ 34.637278] ? syscall_return_slowpath+0x30f/0x5c0 [ 34.642234] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 34.647620] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 34.652504] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 34.657733] RIP: 0033:0x43ea48 [ 34.660926] RSP: 002b:00007ffed4e22b38 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 34.668669] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea48 [ 34.675951] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 34.683236] RBP: 00000000004be3e0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 34.690567] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 34.697889] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 34.705956] Dumping ftrace buffer: [ 34.709809] (ftrace buffer empty) [ 34.713556] Kernel Offset: disabled [ 34.717223] Rebooting in 86400 seconds..