[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 28.512302] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 30.134798] random: sshd: uninitialized urandom read (32 bytes read) [ 30.503353] random: sshd: uninitialized urandom read (32 bytes read) [ 31.645469] random: sshd: uninitialized urandom read (32 bytes read) [ 31.853964] random: sshd: uninitialized urandom read (32 bytes read) [ 37.317388] random: sshd: uninitialized urandom read (32 bytes read) [ 37.338678] Not allocated shadow for addr ffff88019acc0000 (page ffffea0009a0c800) [ 37.346427] Attempted to access 270 bytes [ 37.350574] ------------[ cut here ]------------ [ 37.355306] kernel BUG at mm/kmsan/kmsan.c:1344! [ 37.360072] invalid opcode: 0000 [#1] SMP PTI [ 37.364555] Dumping ftrace buffer: [ 37.368072] (ftrace buffer empty) [ 37.371758] Modules linked in: [ 37.374935] CPU: 0 PID: 4467 Comm: sshd Not tainted 4.17.0-rc5+ #98 [ 37.381316] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.390663] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 37.396263] RSP: 0018:ffff8801c620e700 EFLAGS: 00010082 [ 37.401604] RAX: 000000000000001d RBX: 0000000000000660 RCX: 0000000000000000 [ 37.408852] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 37.416100] RBP: ffff8801c620e718 R08: 0000000000000000 R09: 0000000000000001 [ 37.423350] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88019acc0000 [ 37.430599] R13: 000000000000010e R14: 0000000000000001 R15: 000000000000010e [ 37.437850] FS: 00007f06d52aa7c0(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 37.446071] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.451931] CR2: 00007f06d46fdf70 CR3: 00000001c96e4000 CR4: 00000000001406f0 [ 37.459180] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.466428] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.473674] Call Trace: [ 37.476246] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 37.481415] kmsan_unpoison_shadow+0x66/0xb0 [ 37.485806] virtqueue_get_buf_ctx+0x742/0xa20 [ 37.490370] virtqueue_get_buf+0x72/0x90 [ 37.494410] start_xmit+0x293/0x29a0 [ 37.498105] ? packet_rcv+0x21a0/0x21a0 [ 37.502062] ? virtnet_close+0x2c0/0x2c0 [ 37.506102] dev_hard_start_xmit+0x5f1/0xc70 [ 37.510492] sch_direct_xmit+0x540/0x8f0 [ 37.514534] __qdisc_run+0x1785/0x3730 [ 37.518405] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 37.523751] __dev_queue_xmit+0x1d50/0x3520 [ 37.528055] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 37.533406] dev_queue_xmit+0x4b/0x60 [ 37.537187] ip_finish_output2+0x12a1/0x1470 [ 37.541576] ip_finish_output+0xcb2/0xff0 [ 37.545701] ip_output+0x505/0x5d0 [ 37.549218] ? ip_mc_finish_output+0x3b0/0x3b0 [ 37.553785] ? ip_finish_output+0xff0/0xff0 [ 37.558086] ip_queue_xmit+0x1a1e/0x1d10 [ 37.562127] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 37.567557] ? __skb_clone+0x6ec/0x990 [ 37.571427] ? kmsan_set_origin+0x9e/0x160 [ 37.575638] ? ip_output+0x5d0/0x5d0 [ 37.579328] tcp_transmit_skb+0x3d81/0x53d0 [ 37.583633] tcp_write_xmit+0x2d71/0xb290 [ 37.587770] __tcp_push_pending_frames+0x124/0x3f0 [ 37.592679] tcp_push+0x803/0x8f0 [ 37.596114] tcp_sendmsg_locked+0x4eb1/0x6610 [ 37.600595] tcp_sendmsg+0xb2/0x100 [ 37.604201] ? tcp_sendmsg_locked+0x6610/0x6610 [ 37.608845] inet_sendmsg+0x48d/0x740 [ 37.612626] ? security_socket_sendmsg+0x91/0x1f0 [ 37.617445] ? inet_getname+0x4a0/0x4a0 [ 37.621396] sock_write_iter+0x3b9/0x470 [ 37.625436] ? sock_read_iter+0x480/0x480 [ 37.629583] __vfs_write+0x7fb/0x9f0 [ 37.633282] vfs_write+0x463/0x8d0 [ 37.636802] __x64_sys_write+0x1bf/0x3e0 [ 37.640845] do_syscall_64+0x154/0x220 [ 37.644714] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 37.649881] RIP: 0033:0x7f06d3645370 [ 37.653579] RSP: 002b:00007ffe2833fda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 37.661264] RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007f06d3645370 [ 37.668511] RDX: 0000000000000138 RSI: 000055949f5f6440 RDI: 0000000000000003 [ 37.675759] RBP: 000055949f5f6440 R08: 000055949f5f4c30 R09: 000055949ea3c820 [ 37.683017] R10: 0000000093207b6e R11: 0000000000000246 R12: 00007ffe2833fe0c [ 37.690266] R13: 0000000000000001 R14: 000055949f5fc4a0 R15: 0000000000000000 [ 37.697514] Code: 75 29 48 c7 c7 23 02 a0 8a 31 c0 e8 7d 16 83 ff 80 3c 25 f8 73 53 8b 00 75 11 48 c7 c7 53 02 a0 8a 31 c0 4c 89 fe e8 62 16 83 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 [ 37.716599] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff8801c620e700 [ 37.723689] ---[ end trace 6f722ef81d5e6438 ]--- [ 37.728418] Kernel panic - not syncing: Fatal exception in interrupt [ 37.735353] Dumping ftrace buffer: [ 37.738871] (ftrace buffer empty) [ 37.742557] Kernel Offset: disabled [ 37.746169] Rebooting in 86400 seconds..