[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.792774][ T1663] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.211036][ T1696] random: sshd: uninitialized urandom read (32 bytes read) [ 16.254511][ C1] random: crng init done Warning: Permanently added '10.128.0.182' (ECDSA) to the list of known hosts. executing program [ 22.672168][ T83] usb 1-1: new high-speed USB device number 2 using dummy_hcd [ 22.712187][ C1] ------------[ cut here ]------------ [ 22.717726][ C1] WARNING: CPU: 1 PID: 0 at kernel/kcov.c:684 kcov_remote_start.cold+0xc/0x26 [ 22.726542][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 22.733103][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.3.0-rc7+ #0 [ 22.740186][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.750250][ C1] Call Trace: [ 22.753507][ C1] [ 22.756337][ C1] dump_stack+0xca/0x13e [ 22.760602][ C1] ? kcov_remote_stop+0x110/0x1bc [ 22.765607][ C1] panic+0x2a3/0x6da [ 22.769476][ C1] ? add_taint.cold+0x16/0x16 [ 22.774128][ C1] ? __probe_kernel_read+0x188/0x1d0 [ 22.779384][ C1] ? __warn.cold+0x5/0x4a [ 22.783685][ C1] ? __warn+0xe3/0x1e0 [ 22.787725][ C1] ? kcov_remote_start.cold+0xc/0x26 [ 22.792996][ C1] __warn.cold+0x20/0x4a [ 22.797214][ C1] ? __irq_work_queue_local+0xb1/0xe0 [ 22.802560][ C1] ? kcov_remote_start.cold+0xc/0x26 [ 22.807818][ C1] report_bug+0x262/0x2a0 [ 22.812121][ C1] do_error_trap+0x12b/0x1e0 [ 22.816682][ C1] ? kcov_remote_start.cold+0xc/0x26 [ 22.821939][ C1] do_invalid_op+0x32/0x40 [ 22.826464][ C1] ? kcov_remote_start.cold+0xc/0x26 [ 22.831730][ C1] invalid_op+0x23/0x30 [ 22.835883][ C1] RIP: 0010:kcov_remote_start.cold+0xc/0x26 [ 22.841752][ C1] Code: b0 f8 ff ff 48 c7 c7 d8 dd a4 86 e8 54 93 ea ff 0f 0b 5b 4c 89 e7 5d 41 5c e9 9d e7 2f 04 48 c7 c7 d8 dd a4 86 e8 3a 93 ea ff <0f> 0b e9 93 fd ff ff 48 c7 c7 d8 dd a4 86 e8 27 93 ea ff 0f 0b e9 [ 22.861340][ C1] RSP: 0018:ffff8881db309ae8 EFLAGS: 00010082 [ 22.867381][ C1] RAX: 0000000000000024 RBX: ffff8881d5610000 RCX: 0000000000000000 [ 22.875332][ C1] RDX: 0000000000000000 RSI: ffffffff81288ddd RDI: ffffed103b66134f [ 22.883276][ C1] RBP: ffff8881d5610000 R08: 0000000000000024 R09: fffffbfff0f139e4 [ 22.891220][ C1] R10: fffffbfff0f139e3 R11: ffffffff8789cf1b R12: ffff8881d482a6c8 [ 22.899166][ C1] R13: ffff8881d76cc238 R14: dffffc0000000000 R15: ffff8881d78d8000 [ 22.907123][ C1] ? vprintk_func+0x7d/0x113 [ 22.911688][ C1] ? kcov_remote_start.cold+0xc/0x26 [ 22.916960][ C1] dummy_timer+0x125f/0x301a [ 22.921544][ C1] ? lock_acquire+0x127/0x320 [ 22.926202][ C1] ? dummy_udc_probe+0x930/0x930 [ 22.931113][ C1] call_timer_fn+0x179/0x650 [ 22.935678][ C1] ? dummy_udc_probe+0x930/0x930 [ 22.940590][ C1] ? msleep_interruptible+0x130/0x130 [ 22.945978][ C1] ? do_raw_spin_lock+0x11a/0x280 [ 22.951019][ C1] ? _raw_spin_unlock_irq+0x24/0x30 [ 22.956192][ C1] ? dummy_udc_probe+0x930/0x930 [ 22.961104][ C1] run_timer_softirq+0x5cc/0x14b0 [ 22.966101][ C1] ? add_timer+0x7a0/0x7a0 [ 22.970491][ C1] ? ktime_get+0x162/0x1c0 [ 22.974885][ C1] ? lapic_next_event+0x4d/0x80 [ 22.979709][ C1] __do_softirq+0x221/0x912 [ 22.984196][ C1] irq_exit+0x178/0x1a0 [ 22.988329][ C1] smp_apic_timer_interrupt+0x12f/0x500 [ 22.993852][ C1] apic_timer_interrupt+0xf/0x20 [ 22.998776][ C1] [ 23.001689][ C1] RIP: 0010:default_idle+0x28/0x2e0 [ 23.006881][ C1] Code: 90 90 41 56 41 55 65 44 8b 2d 54 d8 93 7a 41 54 55 53 0f 1f 44 00 00 e8 46 49 d5 fb e9 07 00 00 00 0f 00 2d ea 7d 54 00 fb f4 <65> 44 8b 2d 30 d8 93 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3 [ 23.026470][ C1] RSP: 0018:ffff8881da217dc8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 23.034866][ C1] RAX: 0000000000000007 RBX: ffff8881da1fb000 RCX: 0000000000000000 [ 23.042826][ C1] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8881da1fb844 [ 23.050772][ C1] RBP: ffffed103b43f600 R08: ffff8881da1fb000 R09: 0000000000000000 [ 23.058716][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 [ 23.066661][ C1] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 [ 23.074613][ C1] ? default_idle+0x1a/0x2e0 [ 23.079179][ C1] do_idle+0x3c2/0x4f0 [ 23.083222][ C1] ? __wake_up_common+0x147/0x640 [ 23.088220][ C1] ? arch_cpu_idle_exit+0x40/0x40 [ 23.093217][ C1] ? _raw_spin_unlock_irqrestore+0x3e/0x50 [ 23.098995][ C1] ? lockdep_hardirqs_on+0x379/0x580 [ 23.104254][ C1] cpu_startup_entry+0x14/0x20 [ 23.108990][ C1] start_secondary+0x297/0x340 [ 23.113725][ C1] ? set_cpu_sibling_map+0x1ff0/0x1ff0 [ 23.119165][ C1] secondary_startup_64+0xa4/0xb0 [ 23.124808][ C1] Kernel Offset: disabled [ 23.129151][ C1] Rebooting in 86400 seconds..