[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.164532] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.097000] random: sshd: uninitialized urandom read (32 bytes read) [ 25.724802] random: sshd: uninitialized urandom read (32 bytes read) [ 26.468893] random: sshd: uninitialized urandom read (32 bytes read) [ 26.623459] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 32.185789] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.277775] WARNING: CPU: 0 PID: 4561 at include/net/sock.h:644 smc_unhash_sk+0x345/0x4a0 [ 32.286171] Kernel panic - not syncing: panic_on_warn set ... [ 32.286171] [ 32.293516] CPU: 0 PID: 4561 Comm: syz-executor422 Not tainted 4.17.0-rc3+ #37 [ 32.300852] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.310181] Call Trace: [ 32.312752] dump_stack+0x1b9/0x294 [ 32.316367] ? dump_stack_print_info.cold.2+0x52/0x52 [ 32.321543] ? smc_unhash_sk+0x320/0x4a0 [ 32.325585] panic+0x22f/0x4de [ 32.328759] ? add_taint.cold.5+0x16/0x16 [ 32.332887] ? __warn.cold.8+0x148/0x1b3 [ 32.336926] ? __warn.cold.8+0x117/0x1b3 [ 32.340969] ? smc_unhash_sk+0x345/0x4a0 [ 32.345007] __warn.cold.8+0x163/0x1b3 [ 32.348872] ? smc_unhash_sk+0x345/0x4a0 [ 32.352914] report_bug+0x252/0x2d0 [ 32.356523] do_error_trap+0x1de/0x490 [ 32.360395] ? graph_lock+0x170/0x170 [ 32.364186] ? math_error+0x420/0x420 [ 32.367978] ? lock_acquire+0x1dc/0x520 [ 32.371935] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.376758] do_invalid_op+0x1b/0x20 [ 32.380454] invalid_op+0x14/0x20 [ 32.383891] RIP: 0010:smc_unhash_sk+0x345/0x4a0 [ 32.388535] RSP: 0018:ffff8801d3cbf488 EFLAGS: 00010293 [ 32.393877] RAX: ffff8801ae120180 RBX: ffff8801ad4367c0 RCX: ffffffff873f756e [ 32.401124] RDX: 0000000000000000 RSI: ffffffff873f7625 RDI: 0000000000000005 [ 32.408371] RBP: ffff8801d3cbf570 R08: ffff8801ae120180 R09: ffffed0035a86d08 [ 32.415622] R10: ffffed0035a86d08 R11: ffff8801ad436843 R12: 1ffff1003a797e95 [ 32.422869] R13: ffff8801d3cbf548 R14: ffffffff8970b1e0 R15: ffff8801ad436840 [ 32.430126] ? smc_unhash_sk+0x28e/0x4a0 [ 32.434168] ? smc_unhash_sk+0x345/0x4a0 [ 32.438209] ? smc_unhash_sk+0x345/0x4a0 [ 32.442263] ? smc_rx_data_available+0x100/0x100 [ 32.446999] ? release_sock+0x1e2/0x2b0 [ 32.450954] ? __local_bh_enable_ip+0x161/0x230 [ 32.455603] ? __release_sock+0x3a0/0x3a0 [ 32.459730] ? smc_release+0x269/0x610 [ 32.463600] ? trace_hardirqs_on+0xd/0x10 [ 32.467740] ? __local_bh_enable_ip+0x161/0x230 [ 32.472392] smc_release+0x36e/0x610 [ 32.476096] sock_release+0x96/0x1b0 [ 32.479791] ? sock_alloc_file+0x4e0/0x4e0 [ 32.484008] sock_close+0x16/0x20 [ 32.487452] __fput+0x34d/0x890 [ 32.490712] ? fput+0x1a0/0x1a0 [ 32.493973] ? _raw_spin_unlock_irq+0x27/0x70 [ 32.498450] ____fput+0x15/0x20 [ 32.501712] task_work_run+0x1e4/0x290 [ 32.505580] ? task_work_cancel+0x240/0x240 [ 32.510313] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 32.515837] ? switch_task_namespaces+0xa2/0xd0 [ 32.520488] do_exit+0x1aee/0x2730 [ 32.524018] ? do_raw_spin_trylock+0x151/0x1b0 [ 32.528592] ? mm_update_next_owner+0x980/0x980 [ 32.533242] ? kasan_check_write+0x14/0x20 [ 32.537470] ? do_raw_spin_lock+0xc1/0x200 [ 32.541685] ? trace_hardirqs_off+0xd/0x10 [ 32.545901] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 32.550984] ? debug_check_no_obj_freed+0x2ff/0x584 [ 32.555979] ? _raw_spin_unlock_bh+0x30/0x40 [ 32.560388] ? trace_hardirqs_off+0xd/0x10 [ 32.564610] ? quarantine_put+0xeb/0x190 [ 32.568654] ? kfree+0x111/0x260 [ 32.572000] ? ___sys_sendmsg+0x31a/0x940 [ 32.576146] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.581144] ? trace_hardirqs_on+0xd/0x10 [ 32.585275] ? ___sys_sendmsg+0x31f/0x940 [ 32.589405] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.594923] ? __handle_mm_fault+0x93a/0x4310 [ 32.599404] ? copy_msghdr_from_user+0x560/0x560 [ 32.604142] ? vm_insert_mixed_mkwrite+0x40/0x40 [ 32.608875] ? graph_lock+0x170/0x170 [ 32.612658] ? graph_lock+0x170/0x170 [ 32.616436] ? find_held_lock+0x36/0x1c0 [ 32.620483] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.625999] ? __fget_light+0x2ef/0x430 [ 32.629953] ? fget_raw+0x20/0x20 [ 32.633387] ? find_held_lock+0x36/0x1c0 [ 32.637433] ? lock_downgrade+0x8e0/0x8e0 [ 32.641559] ? handle_mm_fault+0x8c0/0xc70 [ 32.645778] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 32.651294] ? sockfd_lookup_light+0xc5/0x160 [ 32.655769] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.661283] ? __sys_sendmsg+0x1aa/0x270 [ 32.665324] ? __ia32_sys_shutdown+0x80/0x80 [ 32.669743] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 32.675262] ? __do_page_fault+0x441/0xe40 [ 32.679479] do_group_exit+0x16f/0x430 [ 32.683347] ? __ia32_sys_exit+0x50/0x50 [ 32.687393] ? do_syscall_64+0x92/0x800 [ 32.691348] __x64_sys_exit_group+0x3e/0x50 [ 32.695653] do_syscall_64+0x1b1/0x800 [ 32.699520] ? syscall_slow_exit_work+0x4f0/0x4f0 [ 32.704343] ? syscall_return_slowpath+0x5c0/0x5c0 [ 32.709254] ? syscall_return_slowpath+0x30f/0x5c0 [ 32.714168] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 32.719529] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 32.724354] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 32.729528] RIP: 0033:0x43ea78 [ 32.732697] RSP: 002b:00007ffdf04a4a48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 32.740384] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043ea78 [ 32.747631] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 32.754878] RBP: 00000000004be420 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 32.762126] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000000001 [ 32.769374] R13: 00000000006cc160 R14: 0000000000000000 R15: 0000000000000000 [ 32.777229] Dumping ftrace buffer: [ 32.780865] (ftrace buffer empty) [ 32.784556] Kernel Offset: disabled [ 32.788164] Rebooting in 86400 seconds..