[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 33.558864] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 35.006092] random: sshd: uninitialized urandom read (32 bytes read) [ 35.525206] random: sshd: uninitialized urandom read (32 bytes read) [ 36.760551] random: sshd: uninitialized urandom read (32 bytes read) [ 36.985615] random: sshd: uninitialized urandom read (32 bytes read) [ 42.524176] random: sshd: uninitialized urandom read (32 bytes read) [ 42.548711] Not allocated shadow for addr ffff8801d3b0c000 (page ffffea000af62480) [ 42.556446] Attempted to access 270 bytes [ 42.560596] ------------[ cut here ]------------ [ 42.565325] kernel BUG at mm/kmsan/kmsan.c:1326! [ 42.570062] invalid opcode: 0000 [#1] SMP PTI [ 42.574532] Dumping ftrace buffer: [ 42.578051] (ftrace buffer empty) [ 42.581742] Modules linked in: [ 42.584913] CPU: 0 PID: 4562 Comm: sshd Not tainted 4.17.0-rc3+ #88 [ 42.591291] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.600638] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 42.606502] RSP: 0018:ffff88019980e700 EFLAGS: 00010082 [ 42.611839] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000 [ 42.619091] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 42.626341] RBP: ffff88019980e718 R08: 0000000000000000 R09: 0000000000000001 [ 42.633589] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d3b0c000 [ 42.640833] R13: 000000000000010e R14: 0000000000000001 R15: 000000000000010e [ 42.648099] FS: 00007fce966397c0(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 42.656301] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.662167] CR2: 00007fce95a8cf70 CR3: 000000019bbfa000 CR4: 00000000001406f0 [ 42.669415] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.676664] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.683910] Call Trace: [ 42.686481] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 42.691654] kmsan_unpoison_shadow+0x66/0xb0 [ 42.696049] virtqueue_get_buf_ctx+0x742/0xa20 [ 42.700611] virtqueue_get_buf+0x72/0x90 [ 42.704653] start_xmit+0x293/0x29a0 [ 42.708365] ? packet_rcv+0x21a0/0x21a0 [ 42.712318] ? virtnet_close+0x2c0/0x2c0 [ 42.716356] dev_hard_start_xmit+0x5f1/0xc70 [ 42.720919] sch_direct_xmit+0x540/0x8f0 [ 42.724965] __qdisc_run+0x1785/0x3730 [ 42.728843] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 42.734196] __dev_queue_xmit+0x1d50/0x3520 [ 42.738496] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 42.743879] dev_queue_xmit+0x4b/0x60 [ 42.747659] ip_finish_output2+0x12a1/0x1470 [ 42.752045] ip_finish_output+0xcb2/0xff0 [ 42.756172] ip_output+0x505/0x5d0 [ 42.759688] ? ip_mc_finish_output+0x3b0/0x3b0 [ 42.764257] ? ip_finish_output+0xff0/0xff0 [ 42.768556] ip_queue_xmit+0x1a1e/0x1d10 [ 42.772592] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 42.778020] ? __skb_clone+0x6ec/0x990 [ 42.781889] ? kmsan_set_origin+0x9e/0x160 [ 42.786102] ? ip_output+0x5d0/0x5d0 [ 42.789793] tcp_transmit_skb+0x3d81/0x53d0 [ 42.794105] tcp_write_xmit+0x2d71/0xb290 [ 42.798244] __tcp_push_pending_frames+0x124/0x3f0 [ 42.803152] tcp_push+0x8b6/0x9c0 [ 42.806586] tcp_sendmsg_locked+0x4e74/0x65a0 [ 42.811069] tcp_sendmsg+0xb2/0x100 [ 42.814673] ? tcp_sendmsg_locked+0x65a0/0x65a0 [ 42.819317] inet_sendmsg+0x48d/0x740 [ 42.823100] ? security_socket_sendmsg+0x91/0x1f0 [ 42.827918] ? inet_getname+0x4a0/0x4a0 [ 42.831883] sock_write_iter+0x3b9/0x470 [ 42.835921] ? sock_read_iter+0x480/0x480 [ 42.840047] __vfs_write+0x7fb/0x9f0 [ 42.843746] vfs_write+0x463/0x8d0 [ 42.847277] __x64_sys_write+0x1bf/0x3e0 [ 42.851317] do_syscall_64+0x154/0x220 [ 42.855183] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.860345] RIP: 0033:0x7fce949d4370 [ 42.864030] RSP: 002b:00007ffd7fee2078 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 42.871715] RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007fce949d4370 [ 42.878961] RDX: 0000000000000138 RSI: 00005598be03d440 RDI: 0000000000000003 [ 42.886208] RBP: 00005598be03d440 R08: 00005598be03b240 R09: 00005598bd55b820 [ 42.893470] R10: 00000000f5c7b461 R11: 0000000000000246 R12: 00007ffd7fee20dc [ 42.900724] R13: 0000000000000001 R14: 00005598be0434a0 R15: 0000000000000000 [ 42.907971] Code: 75 29 48 c7 c7 84 fe 9f 8a 31 c0 e8 4d 2a 83 ff 80 3c 25 f8 73 53 8b 00 75 11 48 c7 c7 b4 fe 9f 8a 31 c0 4c 89 fe e8 32 2a 83 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 [ 42.927062] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff88019980e700 [ 42.934145] ---[ end trace d07a0a6ac392336b ]--- [ 42.938873] Kernel panic - not syncing: Fatal exception in interrupt [ 42.945899] Dumping ftrace buffer: [ 42.949427] (ftrace buffer empty) [ 42.953113] Kernel Offset: disabled [ 42.956720] Rebooting in 86400 seconds..