INIT: Entering runlevel: 2 [[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 43.520868] Not allocated shadow for addr ffff8801d436c000 (page ffffea000af94880) [ 43.528590] Attempted to access 270 bytes [ 43.532736] ------------[ cut here ]------------ [ 43.537725] kernel BUG at mm/kmsan/kmsan.c:1326! [ 43.542460] invalid opcode: 0000 [#1] SMP PTI [ 43.546930] Dumping ftrace buffer: [ 43.550443] (ftrace buffer empty) [ 43.554127] Modules linked in: [ 43.557299] CPU: 0 PID: 4467 Comm: sshd Not tainted 4.16.0+ #87 [ 43.563329] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.572676] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 43.578272] RSP: 0018:ffff8801975ee648 EFLAGS: 00010082 [ 43.583619] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000 [ 43.590866] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 43.598117] RBP: ffff8801975ee660 R08: 0000000000000000 R09: 0000000000000001 [ 43.605363] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d436c000 [ 43.612609] R13: 000000000000010e R14: 0000000000000001 R15: 000000000000010e [ 43.619858] FS: 00007fcbfdec27c0(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 43.628060] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 43.633917] CR2: 00007fcbfd315f70 CR3: 00000001caafc000 CR4: 00000000001406f0 [ 43.641164] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 43.648411] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 43.655658] Call Trace: [ 43.658232] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 43.663401] kmsan_unpoison_shadow+0x66/0xb0 [ 43.667791] virtqueue_get_buf_ctx+0x742/0xa20 [ 43.672359] virtqueue_get_buf+0x72/0x90 [ 43.676402] start_xmit+0x293/0x29a0 [ 43.680093] ? packet_rcv+0x21a0/0x21a0 [ 43.684059] ? virtnet_close+0x2c0/0x2c0 [ 43.688098] dev_hard_start_xmit+0x5f1/0xc70 [ 43.692490] sch_direct_xmit+0x540/0x8f0 [ 43.696544] __qdisc_run+0x1785/0x3730 [ 43.700412] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 43.705756] __dev_queue_xmit+0x1d50/0x3520 [ 43.710058] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 43.715404] dev_queue_xmit+0x4b/0x60 [ 43.719192] ip_finish_output2+0x12a1/0x1470 [ 43.723580] ip_finish_output+0xcb2/0xff0 [ 43.727725] ip_output+0x505/0x5d0 [ 43.731246] ? ip_mc_finish_output+0x3b0/0x3b0 [ 43.735817] ? ip_finish_output+0xff0/0xff0 [ 43.740113] ip_queue_xmit+0x1a1e/0x1d10 [ 43.744160] ? __msan_metadata_ptr_for_store_2+0x13/0x20 [ 43.749596] ? kmsan_set_origin+0x9e/0x160 [ 43.753812] ? ip_output+0x5d0/0x5d0 [ 43.757503] tcp_transmit_skb+0x3d81/0x53d0 [ 43.761816] tcp_write_xmit+0x3911/0xb920 [ 43.765956] __tcp_push_pending_frames+0x124/0x3f0 [ 43.770863] tcp_push+0x8b6/0x9c0 [ 43.774305] tcp_sendmsg_locked+0x5450/0x6cf0 [ 43.778782] ? kmsan_set_origin_inline+0x6b/0x120 [ 43.783603] ? __msan_poison_alloca+0x15c/0x1d0 [ 43.788257] tcp_sendmsg+0xb2/0x100 [ 43.791862] ? tcp_sendmsg_locked+0x6cf0/0x6cf0 [ 43.796509] inet_sendmsg+0x48d/0x740 [ 43.800289] ? security_socket_sendmsg+0x9e/0x210 [ 43.805109] ? inet_getname+0x500/0x500 [ 43.809061] sock_write_iter+0x3b9/0x470 [ 43.813274] ? sock_read_iter+0x480/0x480 [ 43.817399] __vfs_write+0x7fb/0x9f0 [ 43.821095] vfs_write+0x463/0x8d0 [ 43.824615] SYSC_write+0x172/0x360 [ 43.828227] SyS_write+0x55/0x80 [ 43.831571] do_syscall_64+0x309/0x430 [ 43.835437] ? SYSC_read+0x360/0x360 [ 43.839141] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 43.844308] RIP: 0033:0x7fcbfc25d370 [ 43.848417] RSP: 002b:00007ffdc021f248 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 43.856102] RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007fcbfc25d370 [ 43.863349] RDX: 0000000000000138 RSI: 000055a8126b5440 RDI: 0000000000000003 [ 43.870596] RBP: 000055a8126b5440 R08: 000055a8126b34e0 R09: 000055a811ac0820 [ 43.877841] R10: 00000000671f7328 R11: 0000000000000246 R12: 00007ffdc021f2ac [ 43.885089] R13: 0000000000000001 R14: 000055a8126bb4a0 R15: 0000000000000000 [ 43.892338] Code: 75 29 48 c7 c7 fd 92 7d 8a 31 c0 e8 4d 68 86 ff 80 3c 25 e8 03 2c 8b 00 75 11 48 c7 c7 2d 93 7d 8a 31 c0 4c 89 fe e8 32 68 86 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 [ 43.911420] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff8801975ee648 [ 43.918502] ---[ end trace b8351b03454e093c ]--- [ 43.923229] Kernel panic - not syncing: Fatal exception in interrupt [ 43.930171] Dumping ftrace buffer: [ 43.933688] (ftrace buffer empty) [ 43.937371] Kernel Offset: disabled [ 43.940974] Rebooting in 86400 seconds..