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 '10.128.0.47' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 41.074895] Not allocated shadow for addr ffff8801a3940000 (page ffffea0009d57800) [ 41.082625] Attempted to access 4096 bytes [ 41.086855] ------------[ cut here ]------------ [ 41.091581] kernel BUG at mm/kmsan/kmsan.c:1326! [ 41.096334] invalid opcode: 0000 [#1] SMP PTI [ 41.100820] Dumping ftrace buffer: [ 41.104351] (ftrace buffer empty) [ 41.108056] Modules linked in: [ 41.111248] CPU: 1 PID: 4495 Comm: syz-executor024 Not tainted 4.16.0+ #87 [ 41.118253] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.127622] RIP: 0010:kmsan_get_shadow_address+0x1ce/0x1f0 [ 41.133242] RSP: 0018:ffff8801bdbdf2b8 EFLAGS: 00010082 [ 41.138602] RAX: 000000000000001e RBX: 0000000000000680 RCX: 0000000000000000 [ 41.145871] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000000 [ 41.153142] RBP: ffff8801bdbdf2d0 R08: 0000000000000000 R09: 0000000000000001 [ 41.160408] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801a3940000 [ 41.167674] R13: 0000000000004000 R14: 0000000000000001 R15: 0000000000001000 [ 41.174943] FS: 00007f7f9bfd0700(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000 [ 41.183167] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 41.189044] CR2: 0000000020006000 CR3: 000000019feac000 CR4: 00000000001406e0 [ 41.196312] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 41.203578] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 41.210843] Call Trace: [ 41.213437] kmsan_internal_unpoison_shadow+0x5c/0xe0 [ 41.218634] kmsan_unpoison_shadow+0x66/0xb0 executing program [ 41.223046] get_user_pages_fast+0x47b/0x760 [ 41.227459] iov_iter_get_pages+0x465/0x1810 [ 41.231875] __blockdev_direct_IO+0x1b51/0x66d0 [ 41.236544] ? kmsan_set_origin_inline+0x6b/0x120 [ 41.241392] ? pagevec_lookup_range_tag+0x11b/0x180 [ 41.246407] ? ext4_get_block_unwritten+0xb0/0xb0 [ 41.251240] ext4_direct_IO+0xd51/0x2410 [ 41.255293] ? ext4_releasepage+0x450/0x450 [ 41.259595] generic_file_read_iter+0x3bd2/0x4440 [ 41.264422] ? kmsan_set_origin_inline+0x6b/0x120 [ 41.269250] ? fsnotify+0x493/0x18f0 [ 41.272950] ext4_file_read_iter+0x30f/0x520 [ 41.277345] ? ext4_llseek+0x480/0x480 [ 41.281220] __vfs_read+0x7dd/0x9b0 [ 41.284844] vfs_read+0x36c/0x6c0 [ 41.288286] SYSC_read+0x172/0x360 [ 41.291813] SyS_read+0x55/0x80 [ 41.295083] do_syscall_64+0x309/0x430 [ 41.298956] ? vfs_write+0x8d0/0x8d0 [ 41.302659] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 41.308432] RIP: 0033:0x446769 [ 41.311605] RSP: 002b:00007f7f9bfcfce8 EFLAGS: 00000206 ORIG_RAX: 0000000000000000 [ 41.319296] RAX: ffffffffffffffda RBX: 00000000006dbcac RCX: 0000000000446769 [ 41.326547] RDX: 0000000000008000 RSI: 0000000020000200 RDI: 0000000000000010 [ 41.333803] RBP: 00000000006dbca8 R08: 0000000000000000 R09: 0000000000000000 [ 41.341053] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 [ 41.348303] R13: 00007ffdae5e0d7f R14: 00007f7f9bfd09c0 R15: 0000000000000001 [ 41.355555] 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 [ 41.374678] RIP: kmsan_get_shadow_address+0x1ce/0x1f0 RSP: ffff8801bdbdf2b8 [ 41.381768] ---[ end trace 20db1598a544f1f5 ]--- [ 41.386499] Kernel panic - not syncing: Fatal exception [ 41.392322] Dumping ftrace buffer: [ 41.395839] (ftrace buffer empty) [ 41.399522] Kernel Offset: disabled [ 41.403122] Rebooting in 86400 seconds..