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 '10.128.0.7' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   29.562490] ==================================================================
[   29.569922] BUG: KMSAN: uninit-value in copy_page_to_iter+0x754/0x1b70
[   29.576581] CPU: 0 PID: 3586 Comm: blkid Not tainted 4.16.0+ #84
[   29.582698] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.592032] Call Trace:
[   29.594605]  dump_stack+0x185/0x1d0
[   29.598214]  ? kmsan_internal_check_memory+0x155/0x1e0
[   29.603468]  kmsan_report+0x142/0x240
[   29.607247]  kmsan_internal_check_memory+0x174/0x1e0
[   29.612327]  kmsan_copy_to_user+0x69/0x160
[   29.616541]  copy_page_to_iter+0x754/0x1b70
[   29.620843]  generic_file_read_iter+0x2ee8/0x43f0
[   29.625673]  blkdev_read_iter+0x20d/0x280
[   29.629800]  ? blkdev_write_iter+0x5f0/0x5f0
[   29.634195]  __vfs_read+0x6fb/0x8e0
[   29.637802]  vfs_read+0x36c/0x6c0
[   29.641233]  SYSC_read+0x172/0x360
[   29.644752]  SyS_read+0x55/0x80
[   29.648011]  do_syscall_64+0x309/0x430
[   29.651887]  ? vfs_write+0x8d0/0x8d0
[   29.655579]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[   29.661092] RIP: 0033:0x7f1b3afad310
[   29.664779] RSP: 002b:00007ffd0b944228 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[   29.672468] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1b3afad310
[   29.679722] RDX: 0000000000000400 RSI: 0000000000b77c58 RDI: 0000000000000003
[   29.686977] RBP: 0000000000b77c30 R08: 0000000000000028 R09: 0000000001680000
[   29.694223] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000b77030
[   29.701469] R13: 0000000000000400 R14: 0000000000b77080 R15: 0000000000b77c48
[   29.708716] 
[   29.710317] Uninit was stored to memory at:
[   29.714614]  kmsan_internal_chain_origin+0x12b/0x210
[   29.719694]  kmsan_memcpy_origins+0x11d/0x170
[   29.724166]  __msan_memcpy+0x19f/0x1f0
[   29.728035]  _copy_to_iter+0x852/0x28f0
[   29.731990]  copy_page_to_iter+0x383/0x1b70
[   29.736290]  shmem_file_read_iter+0x99f/0x1180
[   29.740845]  do_iter_readv_writev+0x7bb/0x970
[   29.745316]  do_iter_read+0x303/0xd70
[   29.749091]  vfs_iter_read+0x118/0x180
[   29.752954]  loop_queue_work+0x270e/0x3ef0
[   29.757167]  kthread_worker_fn+0x58f/0x900
[   29.761377]  loop_kthread_worker_fn+0x90/0xb0
[   29.765848]  kthread+0x539/0x720
[   29.769192]  ret_from_fork+0x35/0x40
[   29.772876] Uninit was created at:
[   29.776390]  kmsan_alloc_meta_for_pages+0x161/0x3a0
[   29.781381]  kmsan_alloc_page+0x82/0xe0
[   29.785432]  __alloc_pages_nodemask+0xf5b/0x5dc0
[   29.790166]  alloc_pages_vma+0xcc8/0x1800
[   29.794291]  shmem_alloc_and_acct_page+0x6d5/0x1000
[   29.799283]  shmem_getpage_gfp+0x35db/0x5770
[   29.803670]  shmem_file_read_iter+0x508/0x1180
[   29.808226]  do_iter_readv_writev+0x7bb/0x970
[   29.812696]  do_iter_read+0x303/0xd70
[   29.816476]  vfs_iter_read+0x118/0x180
[   29.820340]  loop_queue_work+0x270e/0x3ef0
[   29.824550]  kthread_worker_fn+0x58f/0x900
[   29.828759]  loop_kthread_worker_fn+0x90/0xb0
[   29.833239]  kthread+0x539/0x720
[   29.836582]  ret_from_fork+0x35/0x40
[   29.840266] 
[   29.841868] Bytes 4-1023 of 1024 are uninitialized
[   29.846768] ==================================================================
[   29.854107] Disabling lock debugging due to kernel taint
[   29.859534] Kernel panic - not syncing: panic_on_warn set ...
[   29.859534] 
[   29.867134] CPU: 0 PID: 3586 Comm: blkid Tainted: G    B            4.16.0+ #84
[   29.874557] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   29.883886] Call Trace:
[   29.886460]  dump_stack+0x185/0x1d0
[   29.890067]  panic+0x39d/0x940
[   29.893247]  ? kmsan_internal_check_memory+0x155/0x1e0
[   29.898499]  kmsan_report+0x238/0x240
[   29.902276]  kmsan_internal_check_memory+0x174/0x1e0
[   29.907363]  kmsan_copy_to_user+0x69/0x160
[   29.911578]  copy_page_to_iter+0x754/0x1b70
[   29.915880]  generic_file_read_iter+0x2ee8/0x43f0
[   29.920710]  blkdev_read_iter+0x20d/0x280
[   29.924835]  ? blkdev_write_iter+0x5f0/0x5f0
[   29.929223]  __vfs_read+0x6fb/0x8e0
[   29.932832]  vfs_read+0x36c/0x6c0
[   29.936266]  SYSC_read+0x172/0x360
[   29.939785]  SyS_read+0x55/0x80
[   29.943047]  do_syscall_64+0x309/0x430
[   29.946914]  ? vfs_write+0x8d0/0x8d0
[   29.950624]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[   29.955820] RIP: 0033:0x7f1b3afad310
[   29.959507] RSP: 002b:00007ffd0b944228 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[   29.967198] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1b3afad310
[   29.974453] RDX: 0000000000000400 RSI: 0000000000b77c58 RDI: 0000000000000003
[   29.981701] RBP: 0000000000b77c30 R08: 0000000000000028 R09: 0000000001680000
[   29.988949] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000b77030
[   29.996195] R13: 0000000000000400 R14: 0000000000b77080 R15: 0000000000b77c48
[   30.004080] Dumping ftrace buffer:
[   30.007613]    (ftrace buffer empty)
[   30.011309] Kernel Offset: disabled
[   30.014913] Rebooting in 86400 seconds..