[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 32.914302] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 36.246930] random: sshd: uninitialized urandom read (32 bytes read) [ 36.649339] random: sshd: uninitialized urandom read (32 bytes read) [ 37.748399] random: sshd: uninitialized urandom read (32 bytes read) [ 151.802941] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. [ 157.265873] random: sshd: uninitialized urandom read (32 bytes read) [ 157.333763] Not allocated shadow for addr ffff8801d38bc000 (page ffffea000af54680) [ 157.341686] Attempted to access 110 bytes [ 157.345856] ------------[ cut here ]------------ [ 157.350588] kernel BUG at mm/kmsan/kmsan.c:1344! [ 157.355335] invalid opcode: 0000 [#1] SMP PTI [ 157.359809] Dumping ftrace buffer: [ 157.363329] (ftrace buffer empty) [ 157.367020] Modules linked in: [ 157.370201] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0-rc5+ #102 [ 157.376846] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 157.386200] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 157.391807] RSP: 0018:ffff88021fc0eef8 EFLAGS: 00010082 [ 157.397154] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000 [ 157.404410] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 157.411669] RBP: ffff88021fc0ef10 R08: 0000000000000000 R09: 0000000000000001 [ 157.418925] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d38bc000 [ 157.426177] R13: 000000000000006e R14: 0000000000000001 R15: 000000000000006e [ 157.433439] FS: 0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 157.441674] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 157.447552] CR2: 00007f78ec6e3f70 CR3: 00000001b9322000 CR4: 00000000001406f0 [ 157.454814] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 157.462070] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 157.469324] Call Trace: [ 157.471892] [ 157.474036] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 157.479226] kmsan_unpoison_shadow+0x66/0xb0 [ 157.483633] virtqueue_get_buf_ctx+0x73f/0xa20 [ 157.488209] virtqueue_get_buf+0x72/0x90 [ 157.492263] start_xmit+0x293/0x29b0 [ 157.495968] ? packet_rcv+0x21a0/0x21a0 [ 157.499934] ? virtnet_close+0x2c0/0x2c0 [ 157.503984] dev_hard_start_xmit+0x5f1/0xc70 [ 157.508381] sch_direct_xmit+0x578/0x8f0 [ 157.512432] __qdisc_run+0x1785/0x3730 [ 157.516324] __dev_queue_xmit+0x1d50/0x3510 [ 157.520641] dev_queue_xmit+0x4b/0x60 [ 157.524447] ip_finish_output2+0x12bf/0x1490 [ 157.528867] ip_finish_output+0xcaf/0xff0 [ 157.533007] ip_output+0x505/0x5d0 [ 157.536534] ? ip_mc_finish_output+0x3b0/0x3b0 [ 157.541111] ? ip_finish_output+0xff0/0xff0 [ 157.545422] ip_queue_xmit+0x1a1d/0x1d10 [ 157.549504] ? kmsan_set_origin_inline+0x6b/0x120 [ 157.554342] ? kmsan_set_origin+0x9e/0x160 [ 157.558564] ? ip_output+0x5d0/0x5d0 [ 157.562261] tcp_transmit_skb+0x3d6d/0x53b0 [ 157.566579] tcp_send_ack+0x7e3/0x900 [ 157.570366] tcp_delack_timer_handler+0x5d0/0xac0 [ 157.575201] tcp_delack_timer+0x1ae/0x350 [ 157.579343] call_timer_fn+0x26a/0x5a0 [ 157.583253] ? tcp_write_timer+0x280/0x280 [ 157.587489] __run_timers+0xda7/0x11c0 [ 157.591377] ? tcp_write_timer+0x280/0x280 [ 157.595600] ? irq_exit+0x202/0x240 [ 157.599215] ? run_timer_softirq+0x14/0x70 [ 157.603457] ? timers_dead_cpu+0x1010/0x1010 [ 157.607857] run_timer_softirq+0x43/0x70 [ 157.611908] __do_softirq+0x56d/0x93d [ 157.615703] irq_exit+0x202/0x240 [ 157.619151] exiting_irq+0xe/0x10 [ 157.622600] smp_apic_timer_interrupt+0x64/0x90 [ 157.627261] apic_timer_interrupt+0xf/0x20 [ 157.631480] [ 157.633705] RIP: 0010:default_idle+0x1fb/0x3c0 [ 157.638270] RSP: 0018:ffffffff8ac0fd90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 157.645968] RAX: ffff8801fd431f38 RBX: 0000000000000000 RCX: ffff880000000000 [ 157.653229] RDX: ffff8801fd031f38 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 [ 157.660487] RBP: ffffffff8ac0fdc8 R08: 0000000001080020 R09: 0000000000000002 [ 157.667758] R10: 00000024a1c70f40 R11: 0000000000000000 R12: ffffffff8ac0fe2f [ 157.675013] R13: ffffffff8ac372c0 R14: ffffffff8ac0fe2c R15: ffffffff8ac37b98 [ 157.682289] ? __cpuidle_text_start+0x8/0x8 [ 157.686617] arch_cpu_idle+0x20/0x30 [ 157.690320] do_idle+0x36d/0x830 [ 157.693678] cpu_startup_entry+0x45/0x50 [ 157.697736] rest_init+0x1c1/0x1f0 [ 157.701285] ? hpet_time_init+0x90/0xe0 [ 157.705251] start_kernel+0x1104/0x1120 [ 157.709215] x86_64_start_kernel+0xe4/0xf0 [ 157.713441] secondary_startup_64+0xa5/0xb0 [ 157.717755] Code: 75 29 48 c7 c7 83 00 a0 8a 31 c0 e8 7d 14 83 ff 80 3c 25 f8 73 53 8b 00 75 11 48 c7 c7 b3 00 a0 8a 31 c0 4c 89 fe e8 62 14 83 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 [ 157.736881] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff88021fc0eef8 [ 157.745001] ---[ end trace b02a4e1a8b3b8d9e ]--- [ 157.749748] Kernel panic - not syncing: Fatal exception in interrupt [ 157.756862] Dumping ftrace buffer: [ 157.760410] (ftrace buffer empty) [ 157.764117] Kernel Offset: disabled [ 157.767745] Rebooting in 86400 seconds..