[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 29.720282] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 30.033314] random: sshd: uninitialized urandom read (32 bytes read) [ 30.407670] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 31.476219] random: sshd: uninitialized urandom read (32 bytes read) [ 35.189650] random: sshd: uninitialized urandom read (32 bytes read) [ 40.656845] random: sshd: uninitialized urandom read (32 bytes read) [ 40.678727] Not allocated shadow for addr ffff8801d3ba4000 (page ffffea000af65d80) [ 40.686442] Attempted to access 782 bytes [ 40.690582] ------------[ cut here ]------------ [ 40.695310] kernel BUG at mm/kmsan/kmsan.c:1344! [ 40.700054] invalid opcode: 0000 [#1] SMP PTI [ 40.704529] Dumping ftrace buffer: [ 40.708045] (ftrace buffer empty) [ 40.711738] Modules linked in: [ 40.714911] CPU: 0 PID: 4511 Comm: sshd Not tainted 4.17.0-rc5+ #101 [ 40.721378] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.730731] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 40.736326] RSP: 0018:ffff880198b9e700 EFLAGS: 00010082 [ 40.741663] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000 [ 40.748910] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 40.756155] RBP: ffff880198b9e718 R08: 0000000000000000 R09: 0000000000000001 [ 40.763399] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d3ba4000 [ 40.770644] R13: 000000000000030e R14: 0000000000000001 R15: 000000000000030e [ 40.777889] FS: 00007fc1209877c0(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 40.786088] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.791942] CR2: 00007fc11fddaf70 CR3: 000000019804c000 CR4: 00000000001406f0 [ 40.799188] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.806435] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.813677] Call Trace: [ 40.816248] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 40.821418] kmsan_unpoison_shadow+0x66/0xb0 [ 40.825805] virtqueue_get_buf_ctx+0x742/0xa20 [ 40.830365] virtqueue_get_buf+0x72/0x90 [ 40.834415] start_xmit+0x293/0x29a0 [ 40.838112] ? packet_rcv+0x21a0/0x21a0 [ 40.842072] ? virtnet_close+0x2c0/0x2c0 [ 40.846112] dev_hard_start_xmit+0x5f1/0xc70 [ 40.850511] sch_direct_xmit+0x540/0x8f0 [ 40.854556] __qdisc_run+0x1785/0x3730 [ 40.858423] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 40.864045] __dev_queue_xmit+0x1d50/0x3520 [ 40.868351] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 40.873697] dev_queue_xmit+0x4b/0x60 [ 40.877476] ip_finish_output2+0x12a1/0x1470 [ 40.881864] ip_finish_output+0xcb2/0xff0 [ 40.885993] ip_output+0x505/0x5d0 [ 40.889514] ? ip_mc_finish_output+0x3b0/0x3b0 [ 40.894075] ? ip_finish_output+0xff0/0xff0 [ 40.898377] ip_queue_xmit+0x1a1e/0x1d10 [ 40.902419] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 40.907859] ? __skb_clone+0x6ec/0x990 [ 40.911725] ? kmsan_set_origin+0x9e/0x160 [ 40.915934] ? ip_output+0x5d0/0x5d0 [ 40.919626] tcp_transmit_skb+0x3d81/0x53d0 [ 40.923929] tcp_write_xmit+0x2d71/0xb290 [ 40.928072] __tcp_push_pending_frames+0x124/0x3f0 [ 40.932978] tcp_push+0x803/0x8f0 [ 40.936412] tcp_sendmsg_locked+0x4eb1/0x6610 [ 40.940896] tcp_sendmsg+0xb2/0x100 [ 40.944500] ? tcp_sendmsg_locked+0x6610/0x6610 [ 40.949151] inet_sendmsg+0x48d/0x740 [ 40.952938] ? security_socket_sendmsg+0x91/0x1f0 [ 40.957774] ? inet_getname+0x4a0/0x4a0 [ 40.961729] sock_write_iter+0x3b9/0x470 [ 40.965769] ? sock_read_iter+0x480/0x480 [ 40.969895] __vfs_write+0x7fb/0x9f0 [ 40.973591] vfs_write+0x463/0x8d0 [ 40.977118] __x64_sys_write+0x1bf/0x3e0 [ 40.981160] do_syscall_64+0x154/0x220 [ 40.985039] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 40.990212] RIP: 0033:0x7fc11ed22370 [ 40.993903] RSP: 002b:00007ffea2b01cf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 41.001598] RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007fc11ed22370 [ 41.008845] RDX: 0000000000000138 RSI: 0000557ab7616440 RDI: 0000000000000003 [ 41.016096] RBP: 0000557ab7616440 R08: 0000557ab76144e0 R09: 0000557ab5ab8820 [ 41.023352] R10: 000000002998febe R11: 0000000000000246 R12: 00007ffea2b01d5c [ 41.030600] R13: 0000000000000001 R14: 0000557ab761c4a0 R15: 0000000000000000 [ 41.037845] Code: 75 29 48 c7 c7 e3 00 a0 8a 31 c0 e8 7d 16 83 ff 80 3c 25 f8 73 53 8b 00 75 11 48 c7 c7 13 01 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 [ 41.056931] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff880198b9e700 [ 41.064028] ---[ end trace 0045a93293e6ee23 ]--- [ 41.068769] Kernel panic - not syncing: Fatal exception in interrupt [ 41.075910] Dumping ftrace buffer: [ 41.079437] (ftrace buffer empty) [ 41.083120] Kernel Offset: disabled [ 41.086724] Rebooting in 86400 seconds..