[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.655983] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.761148] random: sshd: uninitialized urandom read (32 bytes read) [ 21.030297] random: sshd: uninitialized urandom read (32 bytes read) [ 21.764589] random: sshd: uninitialized urandom read (32 bytes read) [ 69.179972] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.207' (ECDSA) to the list of known hosts. [ 74.676648] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 74.782841] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 75.442707] ------------[ cut here ]------------ [ 75.447672] do_IRQ(): syz-executor631 has overflown the kernel stack (cur:ffff8801abc78000,sp:ffff8801a919df50,irq stk top-bottom:ffff8801dae00080-ffff8801dae08000,exception stk top-bottom:fffffe0000007080-fffffe0000011000,ip:write_comp_data+0x1/0x70) [ 75.470279] WARNING: CPU: 0 PID: 4640 at arch/x86/kernel/irq_64.c:63 handle_irq+0x1fb/0x2e7 [ 75.478779] Kernel panic - not syncing: panic_on_warn set ... [ 75.478779] [ 75.486162] CPU: 0 PID: 4640 Comm: syz-executor631 Not tainted 4.18.0-rc3+ #55 [ 75.493524] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.502899] Call Trace: [ 75.505468] [ 75.507617] dump_stack+0x1c9/0x2b4 [ 75.511299] ? dump_stack_print_info.cold.2+0x52/0x52 [ 75.517236] panic+0x238/0x4e7 [ 75.520445] ? add_taint.cold.5+0x16/0x16 [ 75.525476] ? __warn.cold.8+0x148/0x1ba [ 75.529973] ? __warn.cold.8+0x117/0x1ba [ 75.534046] ? handle_irq+0x1fb/0x2e7 [ 75.537855] __warn.cold.8+0x163/0x1ba [ 75.542534] ? handle_irq+0x1fb/0x2e7 [ 75.546382] report_bug+0x252/0x2d0 [ 75.550020] do_error_trap+0x1fc/0x4d0 [ 75.553918] ? rcu_idle_enter+0x480/0x480 [ 75.558070] ? math_error+0x3e0/0x3e0 [ 75.562049] ? vprintk_default+0x28/0x30 [ 75.566112] ? vprintk_func+0x81/0xe7 [ 75.569906] ? printk+0xa7/0xcf [ 75.573284] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 75.578133] do_invalid_op+0x1b/0x20 [ 75.581939] invalid_op+0x14/0x20 [ 75.585402] RIP: 0010:handle_irq+0x1fb/0x2e7 [ 75.589797] Code: 00 00 ff b6 80 00 00 00 48 c7 c7 80 bc e4 87 41 54 41 55 65 48 8b 04 25 40 ee 01 00 48 05 68 06 00 00 48 89 c6 e8 85 b3 1c 00 <0f> 0b 48 83 c4 18 e9 3f ff ff ff 48 89 75 e0 e8 a1 69 8f 00 48 8b [ 75.608954] RSP: 0018:ffff8801dae07f58 EFLAGS: 00010082 [ 75.614505] RAX: 0000000000000000 RBX: ffff8801cf6fc4c0 RCX: 0000000000000000 [ 75.621782] RDX: 0000000000010000 RSI: ffffffff81631851 RDI: 0000000000000001 [ 75.629056] RBP: ffff8801dae07fb0 R08: ffff8801d7ad63c0 R09: ffffed003b5c3ec2 [ 75.636320] R10: ffffed003b5c3ec2 R11: ffff8801dae1f617 R12: fffffe0000011000 [ 75.643582] R13: fffffe0000007080 R14: 0000000000000026 R15: 0000000000000000 [ 75.650887] ? vprintk_func+0x81/0xe7 [ 75.654743] ? handle_irq+0x1fb/0x2e7 [ 75.658560] ? write_comp_data+0x1/0x70 [ 75.662547] ? rcu_irq_enter+0xd8/0x110 [ 75.666516] do_IRQ+0x78/0x190 [ 75.669702] common_interrupt+0xf/0xf [ 75.674562] [ 75.677533] Dumping ftrace buffer: [ 75.681091] (ftrace buffer empty) [ 75.684887] Kernel Offset: disabled [ 75.688527] Rebooting in 86400 seconds..