[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 29.378638] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 30.405507] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 30.772689] random: sshd: uninitialized urandom read (32 bytes read) [ 31.890108] random: sshd: uninitialized urandom read (32 bytes read) [ 32.092603] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.49' (ECDSA) to the list of known hosts. [ 37.546909] random: sshd: uninitialized urandom read (32 bytes read) [ 37.609194] Not allocated shadow for addr ffff8801d3c60000 (page ffffea000af6a400) [ 37.616915] Attempted to access 110 bytes [ 37.621060] ------------[ cut here ]------------ [ 37.625786] kernel BUG at mm/kmsan/kmsan.c:1344! [ 37.630531] invalid opcode: 0000 [#1] SMP PTI [ 37.634995] Dumping ftrace buffer: [ 37.638507] (ftrace buffer empty) [ 37.642189] Modules linked in: [ 37.645357] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.17.0-rc5+ #102 [ 37.652019] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.661382] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 37.666975] RSP: 0018:ffff88021fc0eef8 EFLAGS: 00010082 [ 37.672310] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000 [ 37.679554] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 37.686797] RBP: ffff88021fc0ef10 R08: 0000000000000000 R09: 0000000000000001 [ 37.694040] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d3c60000 [ 37.701283] R13: 000000000000006e R14: 0000000000000001 R15: 000000000000006e [ 37.708536] FS: 0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 37.716741] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.722595] CR2: 00007ffeb958c900 CR3: 00000001bae00000 CR4: 00000000001406f0 [ 37.729842] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.737085] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.744326] Call Trace: [ 37.746879] [ 37.749010] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 37.754180] kmsan_unpoison_shadow+0x66/0xb0 [ 37.758567] virtqueue_get_buf_ctx+0x73f/0xa20 [ 37.763128] virtqueue_get_buf+0x72/0x90 [ 37.767162] start_xmit+0x293/0x29b0 [ 37.770855] ? packet_rcv+0x21a0/0x21a0 [ 37.774806] ? virtnet_close+0x2c0/0x2c0 [ 37.778849] dev_hard_start_xmit+0x5f1/0xc70 [ 37.783246] sch_direct_xmit+0x578/0x8f0 [ 37.787291] __qdisc_run+0x1785/0x3730 [ 37.791168] __dev_queue_xmit+0x1d50/0x3510 [ 37.795481] dev_queue_xmit+0x4b/0x60 [ 37.799274] ip_finish_output2+0x12bf/0x1490 [ 37.803674] ip_finish_output+0xcaf/0xff0 [ 37.807807] ip_output+0x505/0x5d0 [ 37.811329] ? ip_mc_finish_output+0x3b0/0x3b0 [ 37.815891] ? ip_finish_output+0xff0/0xff0 [ 37.820190] ip_queue_xmit+0x1a1d/0x1d10 [ 37.824231] ? kmsan_set_origin_inline+0x6b/0x120 [ 37.829057] ? kmsan_set_origin+0x9e/0x160 [ 37.833272] ? ip_output+0x5d0/0x5d0 [ 37.836968] tcp_transmit_skb+0x3d6d/0x53b0 [ 37.841278] tcp_send_ack+0x7e3/0x900 [ 37.845061] tcp_delack_timer_handler+0x5d0/0xac0 [ 37.850358] tcp_delack_timer+0x1ae/0x350 [ 37.854491] call_timer_fn+0x26a/0x5a0 [ 37.858358] ? tcp_write_timer+0x280/0x280 [ 37.862574] __run_timers+0xda7/0x11c0 [ 37.866440] ? tcp_write_timer+0x280/0x280 [ 37.870659] ? irq_exit+0x202/0x240 [ 37.874270] ? run_timer_softirq+0x14/0x70 [ 37.878488] ? timers_dead_cpu+0x1010/0x1010 [ 37.882875] run_timer_softirq+0x43/0x70 [ 37.886917] __do_softirq+0x56d/0x93d [ 37.890700] irq_exit+0x202/0x240 [ 37.894136] exiting_irq+0xe/0x10 [ 37.897570] smp_apic_timer_interrupt+0x64/0x90 [ 37.902223] apic_timer_interrupt+0xf/0x20 [ 37.906434] [ 37.908653] RIP: 0010:default_idle+0x1fb/0x3c0 [ 37.913211] RSP: 0018:ffffffff8ac0fd90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 37.920916] RAX: ffff8801fd431f38 RBX: 0000000000000000 RCX: ffff880000000000 [ 37.928167] RDX: ffff8801fd031f38 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 [ 37.935423] RBP: ffffffff8ac0fdc8 R08: 0000000001080020 R09: 0000000000000002 [ 37.942683] R10: 00000008c1abcc40 R11: 0000000000000000 R12: ffffffff8ac0fe2f [ 37.949936] R13: ffffffff8ac372c0 R14: ffffffff8ac0fe2c R15: ffffffff8ac37b98 [ 37.957301] ? __cpuidle_text_start+0x8/0x8 [ 37.961606] arch_cpu_idle+0x20/0x30 [ 37.965301] do_idle+0x36d/0x830 [ 37.968650] cpu_startup_entry+0x45/0x50 [ 37.972692] rest_init+0x1c1/0x1f0 [ 37.976213] ? hpet_time_init+0x90/0xe0 [ 37.980177] start_kernel+0x1104/0x1120 [ 37.984133] x86_64_start_kernel+0xe4/0xf0 [ 37.988347] secondary_startup_64+0xa5/0xb0 [ 37.992645] 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 [ 38.011770] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff88021fc0eef8 [ 38.018851] ---[ end trace 1dcb3f49ff47b890 ]--- [ 38.023582] Kernel panic - not syncing: Fatal exception in interrupt [ 38.030521] Dumping ftrace buffer: [ 38.034039] (ftrace buffer empty) [ 38.037723] Kernel Offset: disabled [ 38.041321] Rebooting in 86400 seconds..