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 '10.128.0.50' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 41.252508] print_req_error: I/O error, dev loop0, sector 0 [ 41.258531] print_req_error: I/O error, dev loop0, sector 0 [ 41.264338] Buffer I/O error on dev loop0, logical block 0, async page read executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.712614] print_req_error: I/O error, dev loop0, sector 0 [ 42.718573] print_req_error: I/O error, dev loop0, sector 0 [ 42.724395] Buffer I/O error on dev loop0, logical block 0, async page read executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.909930] print_req_error: I/O error, dev loop0, sector 0 [ 42.915935] print_req_error: I/O error, dev loop0, sector 0 [ 42.921757] Buffer I/O error on dev loop0, logical block 0, async page read executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.348894] print_req_error: I/O error, dev loop0, sector 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.532930] print_req_error: I/O error, dev loop0, sector 128 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.613938] print_req_error: I/O error, dev loop0, sector 0 [ 43.627275] ================================================================== [ 43.634674] BUG: KMSAN: uninit-value in copy_page_to_iter+0x754/0x1b70 [ 43.641334] CPU: 0 PID: 3700 Comm: blkid Not tainted 4.16.0+ #84 [ 43.647460] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.656809] Call Trace: [ 43.659400] dump_stack+0x185/0x1d0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.663035] ? kmsan_internal_check_memory+0x155/0x1e0 [ 43.668305] kmsan_report+0x142/0x240 [ 43.672094] kmsan_internal_check_memory+0x174/0x1e0 [ 43.677188] kmsan_copy_to_user+0x69/0x160 [ 43.681417] copy_page_to_iter+0x754/0x1b70 [ 43.685728] generic_file_read_iter+0x2ee8/0x43f0 [ 43.690579] blkdev_read_iter+0x20d/0x280 [ 43.694730] ? blkdev_write_iter+0x5f0/0x5f0 [ 43.699137] __vfs_read+0x6fb/0x8e0 [ 43.702769] vfs_read+0x36c/0x6c0 [ 43.706214] SYSC_read+0x172/0x360 [ 43.709736] SyS_read+0x55/0x80 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.713005] do_syscall_64+0x309/0x430 [ 43.716884] ? vfs_write+0x8d0/0x8d0 [ 43.720585] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 43.725756] RIP: 0033:0x7f54d8e27310 [ 43.729459] RSP: 002b:00007fff8f6b57e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 43.737163] RAX: ffffffffffffffda RBX: 0000000000000400 RCX: 00007f54d8e27310 [ 43.744422] RDX: 0000000000000400 RSI: 0000000001c0ac58 RDI: 0000000000000003 [ 43.751683] RBP: 0000000001c0ac30 R08: 0000000000000028 R09: 0000000001680000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.758950] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001c0a030 [ 43.766208] R13: 0000000000000400 R14: 0000000001c0a080 R15: 0000000001c0ac48 [ 43.773464] [ 43.775080] Uninit was stored to memory at: [ 43.779919] kmsan_internal_chain_origin+0x12b/0x210 [ 43.785015] kmsan_memcpy_origins+0x11d/0x170 [ 43.789515] __msan_memcpy+0x19f/0x1f0 [ 43.793400] _copy_to_iter+0x852/0x28f0 [ 43.797377] copy_page_to_iter+0x383/0x1b70 [ 43.801690] shmem_file_read_iter+0x99f/0x1180 [ 43.806253] do_iter_readv_writev+0x7bb/0x970 [ 43.810738] do_iter_read+0x303/0xd70 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.814531] vfs_iter_read+0x118/0x180 [ 43.818401] loop_queue_work+0x270e/0x3ef0 [ 43.822618] kthread_worker_fn+0x58f/0x900 [ 43.826849] loop_kthread_worker_fn+0x90/0xb0 [ 43.831343] kthread+0x539/0x720 [ 43.834710] ret_from_fork+0x35/0x40 [ 43.838405] Uninit was created at: [ 43.841930] kmsan_alloc_meta_for_pages+0x161/0x3a0 [ 43.846932] kmsan_alloc_page+0x82/0xe0 [ 43.850906] __alloc_pages_nodemask+0xf5b/0x5dc0 [ 43.855659] alloc_pages_vma+0xcc8/0x1800 [ 43.859807] shmem_alloc_and_acct_page+0x6d5/0x1000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.864814] shmem_getpage_gfp+0x35db/0x5770 [ 43.869214] shmem_file_read_iter+0x508/0x1180 [ 43.873792] do_iter_readv_writev+0x7bb/0x970 [ 43.878270] do_iter_read+0x303/0xd70 [ 43.882063] vfs_iter_read+0x118/0x180 [ 43.885939] loop_queue_work+0x270e/0x3ef0 [ 43.890154] kthread_worker_fn+0x58f/0x900 [ 43.894372] loop_kthread_worker_fn+0x90/0xb0 [ 43.898851] kthread+0x539/0x720 [ 43.902219] ret_from_fork+0x35/0x40 [ 43.905907] [ 43.907518] Bytes 0-1023 of 1024 are uninitialized executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.912430] ================================================================== [ 43.919769] Disabling lock debugging due to kernel taint [ 43.925205] Kernel panic - not syncing: panic_on_warn set ... [ 43.925205] [ 43.932559] CPU: 0 PID: 3700 Comm: blkid Tainted: G B 4.16.0+ #84 [ 43.939992] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.949333] Call Trace: [ 43.951908] dump_stack+0x185/0x1d0 [ 43.955546] panic+0x39d/0x940 [ 43.958757] ? kmsan_internal_check_memory+0x155/0x1e0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.964032] kmsan_report+0x238/0x240 [ 43.967836] kmsan_internal_check_memory+0x174/0x1e0 [ 43.972936] kmsan_copy_to_user+0x69/0x160 [ 43.977162] copy_page_to_iter+0x754/0x1b70 [ 43.981493] generic_file_read_iter+0x2ee8/0x43f0 [ 43.986337] blkdev_read_iter+0x20d/0x280 [ 43.990469] ? blkdev_write_iter+0x5f0/0x5f0 [ 43.994867] __vfs_read+0x6fb/0x8e0 [ 43.998489] vfs_read+0x36c/0x6c0 [ 44.001925] SYSC_read+0x172/0x360 [ 44.005465] SyS_read+0x55/0x80 [ 44.008737] do_syscall_64+0x309/0x430 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 44.012609] ? vfs_write+0x8d0/0x8d0 [ 44.016311] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 44.021486] RIP: 0033:0x7f54d8e27310 [ 44.025196] RSP: 002b:00007fff8f6b57e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 44.032897] RAX: ffffffffffffffda RBX: 0000000000000400 RCX: 00007f54d8e27310 [ 44.040160] RDX: 0000000000000400 RSI: 0000000001c0ac58 RDI: 0000000000000003 [ 44.047417] RBP: 0000000001c0ac30 R08: 0000000000000028 R09: 0000000001680000 [ 44.054692] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001c0a030 executing program [ 44.061953] R13: 0000000000000400 R14: 0000000001c0a080 R15: 0000000001c0ac48 [ 44.069690] Dumping ftrace buffer: [ 44.073213] (ftrace buffer empty) [ 44.076895] Kernel Offset: disabled [ 44.080496] Rebooting in 86400 seconds..