INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 42.236388] Not allocated shadow for addr ffff8801d402c000 (page ffffea000af81080) [ 42.244132] Attempted to access 270 bytes [ 42.248285] ------------[ cut here ]------------ [ 42.253017] kernel BUG at mm/kmsan/kmsan.c:1326! [ 42.257766] invalid opcode: 0000 [#1] SMP PTI [ 42.262240] Dumping ftrace buffer: [ 42.265756] (ftrace buffer empty) [ 42.269453] Modules linked in: [ 42.272639] CPU: 0 PID: 4504 Comm: sshd Not tainted 4.16.0+ #85 [ 42.278673] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.288019] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 42.293622] RSP: 0018:ffff8801c386e648 EFLAGS: 00010082 [ 42.298964] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000 [ 42.306220] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 42.313473] RBP: ffff8801c386e660 R08: 0000000000000000 R09: 0000000000000001 [ 42.320733] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d402c000 [ 42.327987] R13: 000000000000010e R14: 0000000000000001 R15: 000000000000010e [ 42.335240] FS: 00007fa65f58f7c0(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 42.343451] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.349312] CR2: 00007fa65ed42fb0 CR3: 00000001cc1ba000 CR4: 00000000001406f0 [ 42.356574] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.363826] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.371077] Call Trace: [ 42.373675] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 42.378848] kmsan_unpoison_shadow+0x66/0xb0 [ 42.383241] virtqueue_get_buf_ctx+0x742/0xa20 [ 42.387806] virtqueue_get_buf+0x72/0x90 [ 42.391850] start_xmit+0x293/0x29a0 [ 42.395545] ? packet_rcv+0x21a0/0x21a0 [ 42.399506] ? virtnet_close+0x2c0/0x2c0 [ 42.403551] dev_hard_start_xmit+0x5f1/0xc70 [ 42.407952] sch_direct_xmit+0x540/0x8f0 [ 42.411998] __qdisc_run+0x1785/0x3730 [ 42.415871] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 42.421228] __dev_queue_xmit+0x1d50/0x3520 [ 42.425536] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 42.430883] dev_queue_xmit+0x4b/0x60 [ 42.434665] ip_finish_output2+0x12a1/0x1470 [ 42.439072] ip_finish_output+0xcb2/0xff0 [ 42.443212] ip_output+0x505/0x5d0 [ 42.446732] ? ip_mc_finish_output+0x3b0/0x3b0 [ 42.451299] ? ip_finish_output+0xff0/0xff0 [ 42.455604] ip_queue_xmit+0x1a1e/0x1d10 [ 42.459648] ? __msan_metadata_ptr_for_store_2+0x13/0x20 [ 42.465090] ? kmsan_set_origin+0x9e/0x160 [ 42.469307] ? ip_output+0x5d0/0x5d0 [ 42.472998] tcp_transmit_skb+0x3d81/0x53d0 [ 42.477309] tcp_write_xmit+0x3911/0xb920 [ 42.481450] __tcp_push_pending_frames+0x124/0x3f0 [ 42.486366] tcp_push+0x8b6/0x9c0 [ 42.489804] tcp_sendmsg_locked+0x5450/0x6cf0 [ 42.495195] ? kmsan_set_origin_inline+0x6b/0x120 [ 42.500027] ? __msan_poison_alloca+0x15c/0x1d0 [ 42.504685] tcp_sendmsg+0xb2/0x100 [ 42.508296] ? tcp_sendmsg_locked+0x6cf0/0x6cf0 [ 42.512943] inet_sendmsg+0x48d/0x740 [ 42.516723] ? security_socket_sendmsg+0x9e/0x210 [ 42.521550] ? inet_getname+0x500/0x500 [ 42.525506] sock_write_iter+0x3b9/0x470 [ 42.529551] ? sock_read_iter+0x480/0x480 [ 42.533682] __vfs_write+0x7fb/0x9f0 [ 42.537379] vfs_write+0x463/0x8d0 [ 42.540899] SYSC_write+0x172/0x360 [ 42.544510] SyS_write+0x55/0x80 [ 42.547858] do_syscall_64+0x309/0x430 [ 42.551726] ? SYSC_read+0x360/0x360 [ 42.555424] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 42.560592] RIP: 0033:0x7fa65d92a370 [ 42.564289] RSP: 002b:00007ffcc6e68ec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 42.571993] RAX: ffffffffffffffda RBX: 0000000000000138 RCX: 00007fa65d92a370 [ 42.579240] RDX: 0000000000000138 RSI: 00005616a533b430 RDI: 0000000000000003 [ 42.586488] RBP: 00005616a533b430 R08: 00005616a533a270 R09: 00005616a4bd8820 [ 42.593741] R10: 0000000089cbf60e R11: 0000000000000246 R12: 00007ffcc6e68f2c [ 42.600991] R13: 0000000000000001 R14: 00005616a5341490 R15: 0000000000000000 [ 42.608246] Code: 75 29 48 c7 c7 fd 92 7d 8a 31 c0 e8 9d 6a 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 82 6a 86 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 [ 42.627355] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff8801c386e648 [ 42.634440] ---[ end trace 615e2cac85963f45 ]--- [ 42.639175] Kernel panic - not syncing: Fatal exception in interrupt [ 42.646129] Dumping ftrace buffer: [ 42.649656] (ftrace buffer empty) [ 42.653359] Kernel Offset: disabled [ 42.656965] Rebooting in 86400 seconds..