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 Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. syzkaller login: [ 42.272247] Not allocated shadow for addr ffff8801d43ac000 (page ffffea000af96080) [ 42.279973] Attempted to access 110 bytes [ 42.284117] ------------[ cut here ]------------ [ 42.288843] kernel BUG at mm/kmsan/kmsan.c:1326! [ 42.293587] invalid opcode: 0000 [#1] SMP PTI [ 42.298059] Dumping ftrace buffer: [ 42.301570] (ftrace buffer empty) [ 42.305256] Modules linked in: [ 42.308425] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.16.0+ #85 [ 42.314633] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.323977] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 42.329576] RSP: 0018:ffff88021fd0eef8 EFLAGS: 00010082 [ 42.334917] RAX: 000000000000001d RBX: 0000000000000740 RCX: 0000000000000000 [ 42.342171] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 42.349422] RBP: ffff88021fd0ef10 R08: 0000000000000000 R09: 0000000000000001 [ 42.356665] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d43ac000 [ 42.363910] R13: 000000000000006e R14: 0000000000000001 R15: 000000000000006e [ 42.371157] FS: 0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 [ 42.379355] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.385211] CR2: 00007ffff8bfbad0 CR3: 00000001b6418000 CR4: 00000000001406e0 [ 42.392461] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 42.399710] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 42.406959] Call Trace: [ 42.409523] [ 42.411653] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 42.416823] kmsan_unpoison_shadow+0x66/0xb0 [ 42.421219] virtqueue_get_buf_ctx+0x742/0xa20 [ 42.425780] virtqueue_get_buf+0x72/0x90 [ 42.429816] start_xmit+0x293/0x29a0 [ 42.433506] ? packet_rcv+0x21a0/0x21a0 [ 42.437457] ? virtnet_close+0x2c0/0x2c0 [ 42.441506] dev_hard_start_xmit+0x5f1/0xc70 [ 42.445903] sch_direct_xmit+0x540/0x8f0 [ 42.449949] __qdisc_run+0x1785/0x3730 [ 42.453822] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 42.459173] __dev_queue_xmit+0x1d50/0x3520 [ 42.463477] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 42.468825] dev_queue_xmit+0x4b/0x60 [ 42.472610] ip_finish_output2+0x12a1/0x1470 [ 42.477009] ip_finish_output+0xcb2/0xff0 [ 42.481139] ip_output+0x505/0x5d0 [ 42.484660] ? ip_mc_finish_output+0x3b0/0x3b0 [ 42.489223] ? ip_finish_output+0xff0/0xff0 [ 42.493527] ip_queue_xmit+0x1a1e/0x1d10 [ 42.497570] ? __msan_metadata_ptr_for_store_2+0x13/0x20 [ 42.503002] ? kmsan_set_origin+0x9e/0x160 [ 42.507220] ? ip_output+0x5d0/0x5d0 [ 42.510924] tcp_transmit_skb+0x3d81/0x53d0 [ 42.515236] tcp_send_ack+0x7e3/0x910 [ 42.519026] tcp_delack_timer_handler+0x5d0/0xac0 [ 42.523851] tcp_delack_timer+0x1be/0x360 [ 42.527982] ? call_timer_fn+0x7e/0x5a0 [ 42.531937] call_timer_fn+0x26a/0x5a0 [ 42.535806] ? tcp_write_timer+0x290/0x290 [ 42.540022] __run_timers+0xda7/0x11c0 [ 42.543890] ? tcp_write_timer+0x290/0x290 [ 42.548110] ? irq_exit+0x202/0x240 [ 42.551717] ? run_timer_softirq+0x14/0x70 [ 42.555932] ? timers_dead_cpu+0x1010/0x1010 [ 42.560318] run_timer_softirq+0x43/0x70 [ 42.564361] __do_softirq+0x56d/0x93d [ 42.568146] irq_exit+0x202/0x240 [ 42.571579] exiting_irq+0xe/0x10 [ 42.575011] smp_apic_timer_interrupt+0x64/0x90 [ 42.579660] apic_timer_interrupt+0xf/0x20 [ 42.583869] [ 42.586086] RIP: 0010:default_idle+0x1fb/0x3c0 [ 42.590647] RSP: 0018:ffff8801d96bfdf0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12 [ 42.598335] RAX: ffff8801fddd81a0 RBX: 0000000000000000 RCX: ffff880000000000 [ 42.605584] RDX: ffff8801fd9d81a0 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 [ 42.612834] RBP: ffff8801d96bfe28 R08: 0000000001080020 R09: 0000000000000002 [ 42.620082] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 42.627329] R13: ffff8801d9633b00 R14: ffff8801d96bfe8c R15: ffff8801d9634418 [ 42.634589] ? __cpuidle_text_start+0x8/0x8 [ 42.638892] arch_cpu_idle+0x20/0x30 [ 42.642589] do_idle+0x349/0x790 [ 42.645939] cpu_startup_entry+0x45/0x50 [ 42.649981] ? setup_APIC_timer+0x220/0x220 [ 42.654284] start_secondary+0x39d/0x470 [ 42.658325] secondary_startup_64+0xa5/0xb0 [ 42.662625] 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 [ 42.681744] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff88021fd0eef8 [ 42.688833] ---[ end trace 18e613764879fdda ]--- [ 42.693566] Kernel panic - not syncing: Fatal exception in interrupt [ 42.700480] Dumping ftrace buffer: [ 42.703997] (ftrace buffer empty) [ 42.707678] Kernel Offset: disabled [ 42.711277] Rebooting in 86400 seconds..