[....] 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[ 28.778896] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 33.914773] random: sshd: uninitialized urandom read (32 bytes read) [ 34.238826] random: sshd: uninitialized urandom read (32 bytes read) [ 35.652208] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.48' (ECDSA) to the list of known hosts. [ 41.181523] random: sshd: uninitialized urandom read (32 bytes read) [ 41.246238] Not allocated shadow for addr ffff8801d3b2c000 (page ffffea000af63080) [ 41.253976] Attempted to access 110 bytes [ 41.258127] ------------[ cut here ]------------ [ 41.262854] kernel BUG at mm/kmsan/kmsan.c:1378! [ 41.267589] invalid opcode: 0000 [#1] SMP PTI [ 41.272068] Dumping ftrace buffer: [ 41.275578] (ftrace buffer empty) [ 41.279264] Modules linked in: [ 41.282437] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0+ #5 [ 41.288575] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.297922] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 41.303518] RSP: 0018:ffff88021fc0eee8 EFLAGS: 00010082 [ 41.308856] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000 [ 41.316115] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 41.323367] RBP: ffff88021fc0ef00 R08: 0000000000000000 R09: 0000000000000001 [ 41.330623] R10: 0000000000000000 R11: ffffffff86575280 R12: ffff8801d3b2c000 [ 41.337868] R13: 000000000000006e R14: 0000000000000001 R15: 000000000000006e [ 41.345117] FS: 0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 41.353316] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.359174] CR2: 00007f079cbb4f70 CR3: 00000001b65a2000 CR4: 00000000001406f0 [ 41.366424] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.373676] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.380926] Call Trace: [ 41.383481] [ 41.385627] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 41.390791] kmsan_unpoison_shadow+0x66/0xb0 [ 41.395176] virtqueue_get_buf_ctx+0x73f/0xa20 [ 41.399737] virtqueue_get_buf+0x72/0x90 [ 41.403776] start_xmit+0x293/0x29c0 [ 41.407467] ? packet_rcv+0x2210/0x2210 [ 41.411426] ? virtnet_close+0x2c0/0x2c0 [ 41.415470] dev_hard_start_xmit+0x5f6/0xc80 [ 41.419866] sch_direct_xmit+0x578/0x8f0 [ 41.423912] __qdisc_run+0x1822/0x3730 [ 41.427803] __dev_queue_xmit+0x2069/0x3540 [ 41.432122] dev_queue_xmit+0x4b/0x60 [ 41.435902] ip_finish_output2+0x12a8/0x1480 [ 41.440295] ip_finish_output+0xcbc/0x1000 [ 41.444515] ip_output+0x505/0x5d0 [ 41.448034] ? ip_mc_finish_output+0x3b0/0x3b0 [ 41.452607] ? ip_finish_output+0x1000/0x1000 [ 41.457083] ip_queue_xmit+0x1b0f/0x1d00 [ 41.461125] ? kmsan_set_origin_inline+0x6b/0x120 [ 41.465957] ? ip_output+0x5d0/0x5d0 [ 41.469659] tcp_transmit_skb+0x3db5/0x5350 [ 41.473968] tcp_send_ack+0x7e8/0x900 [ 41.477752] tcp_delack_timer_handler+0x5d0/0xac0 [ 41.482578] tcp_delack_timer+0x1ae/0x350 [ 41.486724] call_timer_fn+0x280/0x5d0 [ 41.490600] ? tcp_write_timer+0x280/0x280 [ 41.494816] __run_timers+0xd96/0x11b0 [ 41.498681] ? tcp_write_timer+0x280/0x280 [ 41.502896] ? irq_exit+0x202/0x240 [ 41.506502] ? run_timer_softirq+0x14/0x70 [ 41.510721] ? timers_dead_cpu+0x1010/0x1010 [ 41.515116] run_timer_softirq+0x43/0x70 [ 41.519159] __do_softirq+0x592/0x979 [ 41.522940] irq_exit+0x202/0x240 [ 41.526388] exiting_irq+0xe/0x10 [ 41.529823] smp_apic_timer_interrupt+0x64/0x90 [ 41.534477] apic_timer_interrupt+0xf/0x20 [ 41.538686] [ 41.540905] RIP: 0010:default_idle+0x20b/0x3e0 [ 41.545463] RSP: 0018:ffffffff8ac0fd90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 41.553158] RAX: ffff8801fd432f18 RBX: 0000000000000000 RCX: ffff880000000000 [ 41.560409] RDX: ffff8801fd032f18 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 [ 41.567658] RBP: ffffffff8ac0fdc8 R08: 0000000001080020 R09: 0000000000000002 [ 41.574907] R10: 000000099a740380 R11: ffffffff89fef830 R12: ffffffff8ac0fe2f [ 41.582158] R13: ffffffff8ac372c0 R14: ffffffff8ac0fe2c R15: ffffffff8ac37b98 [ 41.589409] ? __cpuidle_text_start+0x8/0x8 [ 41.593720] ? __cpuidle_text_start+0x8/0x8 [ 41.598023] arch_cpu_idle+0x26/0x30 [ 41.601714] do_idle+0x36d/0x830 [ 41.605061] cpu_startup_entry+0x45/0x50 [ 41.609101] rest_init+0x1c1/0x1f0 [ 41.612620] ? hpet_time_init+0xb0/0xe0 [ 41.616574] start_kernel+0x1110/0x1120 [ 41.620533] x86_64_start_kernel+0xe4/0xf0 [ 41.624745] secondary_startup_64+0xa5/0xb0 [ 41.629042] Code: 75 29 48 c7 c7 59 38 97 8a 31 c0 e8 ad 4e 80 ff 80 3c 25 f8 93 53 8b 00 75 11 48 c7 c7 89 38 97 8a 31 c0 4c 89 fe e8 92 4e 80 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 [ 41.648611] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff88021fc0eee8 [ 41.655695] ---[ end trace 3bf66dda5e270b3b ]--- [ 41.660427] Kernel panic - not syncing: Fatal exception in interrupt [ 41.667373] Dumping ftrace buffer: [ 41.670894] (ftrace buffer empty) [ 41.674577] Kernel Offset: disabled [ 41.678177] Rebooting in 86400 seconds..