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 '10.128.10.31' (ECDSA) to the list of known hosts. syzkaller login: [ 186.927237] Not allocated shadow for addr ffff8801dcec8000 (page ffffea000b2d8b00) [ 186.934969] Attempted to access 102 bytes [ 186.939107] ------------[ cut here ]------------ [ 186.943830] kernel BUG at mm/kmsan/kmsan.c:1326! [ 186.948561] invalid opcode: 0000 [#1] SMP PTI [ 186.953024] Dumping ftrace buffer: [ 186.956532] (ftrace buffer empty) [ 186.960213] Modules linked in: [ 186.963383] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.16.0+ #83 [ 186.969582] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 186.978922] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 186.984519] RSP: 0018:ffff88021fc0eed8 EFLAGS: 00010086 [ 186.989856] RAX: 000000000000001d RBX: 0000000000000760 RCX: 0000000000000000 [ 186.997099] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 187.004343] RBP: ffff88021fc0eef0 R08: 0000000000000000 R09: 0000000000000001 [ 187.011585] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801dcec8000 [ 187.018828] R13: 0000000000000066 R14: 0000000000000001 R15: 0000000000000066 [ 187.026075] FS: 0000000000000000(0000) GS:ffff88021fc00000(0000) knlGS:0000000000000000 [ 187.034273] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 187.040126] CR2: 00007ffcd2868ab0 CR3: 00000001a7db8000 CR4: 00000000001406f0 [ 187.047373] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 187.054616] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 187.061859] Call Trace: [ 187.064417] [ 187.066552] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 187.071718] kmsan_unpoison_shadow+0x66/0xb0 [ 187.076120] virtqueue_get_buf_ctx+0x742/0xa20 [ 187.080678] virtqueue_get_buf+0x72/0x90 [ 187.084715] start_xmit+0x276/0x2840 [ 187.088410] ? virtnet_close+0x2c0/0x2c0 [ 187.092445] dev_hard_start_xmit+0x5f1/0xc70 [ 187.096831] sch_direct_xmit+0x540/0x8f0 [ 187.100866] __qdisc_run+0x1785/0x3730 [ 187.104730] ? __msan_metadata_ptr_for_load_8+0x10/0x20 [ 187.110069] __dev_queue_xmit+0x174a/0x2b60 [ 187.114368] dev_queue_xmit+0x4b/0x60 [ 187.118142] ip_finish_output2+0x1198/0x1380 [ 187.122527] ip_finish_output+0xcb0/0xff0 [ 187.126648] ip_output+0x502/0x5c0 [ 187.130159] ? ip_mc_finish_output+0x3b0/0x3b0 [ 187.134713] ? ip_finish_output+0xff0/0xff0 [ 187.139008] ip_queue_xmit+0x1fae/0x21c0 [ 187.143041] ? __ip_local_out+0x5b0/0x5b0 [ 187.147161] ? __msan_poison_alloca+0x15c/0x1d0 [ 187.151805] ? ip_output+0x5c0/0x5c0 [ 187.155493] tcp_transmit_skb+0x38be/0x51f0 [ 187.159796] tcp_send_ack+0x7e3/0x910 [ 187.163578] tcp_delack_timer_handler+0x5d0/0xac0 [ 187.168397] tcp_delack_timer+0x1be/0x360 [ 187.172538] ? call_timer_fn+0x7e/0x5a0 [ 187.176486] call_timer_fn+0x26a/0x5a0 [ 187.180351] ? tcp_write_timer+0x290/0x290 [ 187.184558] __run_timers+0xda7/0x11c0 [ 187.188418] ? tcp_write_timer+0x290/0x290 [ 187.192628] ? irq_exit+0x202/0x240 [ 187.196228] ? run_timer_softirq+0x14/0x70 [ 187.200444] ? timers_dead_cpu+0x1010/0x1010 [ 187.204824] run_timer_softirq+0x43/0x70 [ 187.208858] __do_softirq+0x56d/0x93d [ 187.212634] irq_exit+0x202/0x240 [ 187.216061] exiting_irq+0xe/0x10 [ 187.219489] smp_apic_timer_interrupt+0x64/0x90 [ 187.224511] apic_timer_interrupt+0xf/0x20 [ 187.228718] [ 187.230930] RIP: 0010:default_idle+0x1fb/0x3c0 [ 187.235486] RSP: 0018:ffffffff87c0fd88 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff12 [ 187.243166] RAX: ffff880203eb5440 RBX: 0000000000000000 RCX: ffff880000000000 [ 187.250408] RDX: ffff880203ab5440 RSI: aaaaaaaaaaaab000 RDI: ffffea0000000000 [ 187.257652] RBP: ffffffff87c0fdc0 R08: 0000000001080020 R09: 0000000000000002 [ 187.264893] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 187.272137] R13: ffffffff87c1eb00 R14: ffffffff87c0fe24 R15: ffffffff87c1f418 [ 187.279391] ? default_idle+0x6b/0x3c0 [ 187.283249] ? __sched_text_end+0x1/0x1 [ 187.287200] arch_cpu_idle+0x20/0x30 [ 187.290886] do_idle+0x349/0x790 [ 187.294225] cpu_startup_entry+0x45/0x50 [ 187.298260] rest_init+0x1c1/0x1f0 [ 187.301774] ? hpet_time_init+0x20/0xe0 [ 187.305720] start_kernel+0xf93/0xfb0 [ 187.309495] x86_64_start_kernel+0x2fa/0x310 [ 187.313877] secondary_startup_64+0xa5/0xb0 [ 187.318169] Code: 75 29 48 c7 c7 71 2a a1 87 31 c0 e8 0d 11 86 ff 80 3c 25 a8 a4 2d 88 00 75 11 48 c7 c7 a1 2a a1 87 31 c0 4c 89 fe e8 f2 10 86 ff <0f> 0b eb fe 48 3d ff ff ff 1f 0f 87 a2 fe ff ff 48 8b 1c 25 10 [ 187.337242] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff88021fc0eed8 [ 187.344317] ---[ end trace 688f199442974a10 ]--- [ 187.349044] Kernel panic - not syncing: Fatal exception in interrupt [ 187.355899] Dumping ftrace buffer: [ 187.359415] (ftrace buffer empty) [ 187.363098] Kernel Offset: disabled [ 187.366696] Rebooting in 86400 seconds..