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 '10.128.0.37' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 46.396548] ================================================================== [ 46.403987] BUG: KMSAN: uninit-value in copy_page_to_iter+0x754/0x1b70 [ 46.410659] CPU: 1 PID: 4518 Comm: blkid Not tainted 4.16.0+ #85 [ 46.416796] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.426141] Call Trace: [ 46.429340] dump_stack+0x185/0x1d0 [ 46.432974] ? kmsan_internal_check_memory+0x155/0x1e0 [ 46.438253] kmsan_report+0x142/0x240 [ 46.442059] kmsan_internal_check_memory+0x174/0x1e0 [ 46.447162] kmsan_copy_to_user+0x69/0x160 [ 46.451396] copy_page_to_iter+0x754/0x1b70 [ 46.455722] generic_file_read_iter+0x2ee8/0x4440 [ 46.460583] blkdev_read_iter+0x20d/0x280 [ 46.464732] ? blkdev_write_iter+0x5f0/0x5f0 [ 46.469138] __vfs_read+0x7dd/0x9b0 [ 46.472778] vfs_read+0x36c/0x6c0 [ 46.476245] SYSC_read+0x172/0x360 [ 46.479787] SyS_read+0x55/0x80 [ 46.483068] do_syscall_64+0x309/0x430 [ 46.486956] ? vfs_write+0x8d0/0x8d0 [ 46.490674] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 46.495860] RIP: 0033:0x7f06ee0a5310 [ 46.499584] RSP: 002b:00007ffc67b48068 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 46.507291] RAX: ffffffffffffffda RBX: 0000000000001c00 RCX: 00007f06ee0a5310 [ 46.514562] RDX: 0000000000000400 RSI: 00000000021376e8 RDI: 0000000000000003 [ 46.522711] RBP: 00000000021376c0 R08: 0000000000000028 R09: 0000000001680000 [ 46.529982] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002136030 [ 46.537254] R13: 0000000000000400 R14: 0000000002136080 R15: 00000000021376d8 [ 46.544523] [ 46.546141] Uninit was stored to memory at: [ 46.550463] kmsan_internal_chain_origin+0x12b/0x210 [ 46.555558] kmsan_memcpy_origins+0x11d/0x170 [ 46.560074] __msan_memcpy+0x109/0x160 [ 46.563965] iov_iter_copy_from_user_atomic+0xb04/0x17d0 [ 46.569413] generic_perform_write+0x4c6/0x990 [ 46.573989] __generic_file_write_iter+0x64d/0xa10 [ 46.578919] blkdev_write_iter+0x3a8/0x5f0 [ 46.583146] do_iter_readv_writev+0x84d/0xa00 [ 46.587639] do_iter_write+0x30d/0xd40 [ 46.591522] vfs_iter_write+0x118/0x180 [ 46.595491] iter_file_splice_write+0xbc3/0x1710 [ 46.600237] direct_splice_actor+0x19b/0x200 [ 46.604642] splice_direct_to_actor+0x764/0x1040 [ 46.609392] do_splice_direct+0x335/0x540 [ 46.613532] do_sendfile+0x1067/0x1e40 [ 46.617414] SYSC_sendfile64+0x1b3/0x300 [ 46.621471] SyS_sendfile64+0x64/0x90 [ 46.625272] do_syscall_64+0x309/0x430 [ 46.629162] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 46.634351] Uninit was created at: [ 46.637903] kmsan_alloc_meta_for_pages+0x161/0x3a0 [ 46.642918] kmsan_alloc_page+0x82/0xe0 [ 46.646889] __alloc_pages_nodemask+0xf5b/0x5dc0 [ 46.651638] alloc_pages_vma+0xcc8/0x1800 [ 46.655788] shmem_alloc_and_acct_page+0x6d5/0x1000 [ 46.660800] shmem_getpage_gfp+0x35db/0x5770 [ 46.665204] shmem_file_read_iter+0x508/0x1180 [ 46.669781] generic_file_splice_read+0x5d2/0x900 [ 46.674616] splice_direct_to_actor+0x4c6/0x1040 [ 46.679366] do_splice_direct+0x335/0x540 [ 46.683508] do_sendfile+0x1067/0x1e40 [ 46.687391] SYSC_sendfile64+0x1b3/0x300 [ 46.691455] SyS_sendfile64+0x64/0x90 [ 46.695251] do_syscall_64+0x309/0x430 [ 46.699144] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 46.704325] [ 46.705944] Bytes 0-1023 of 1024 are uninitialized [ 46.710861] ================================================================== [ 46.718208] Disabling lock debugging due to kernel taint [ 46.723652] Kernel panic - not syncing: panic_on_warn set ... [ 46.723652] [ 46.731020] CPU: 1 PID: 4518 Comm: blkid Tainted: G B 4.16.0+ #85 [ 46.738464] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.747844] Call Trace: [ 46.750433] dump_stack+0x185/0x1d0 [ 46.754062] panic+0x39d/0x940 [ 46.757280] ? kmsan_internal_check_memory+0x155/0x1e0 [ 46.762552] kmsan_report+0x238/0x240 [ 46.766357] kmsan_internal_check_memory+0x174/0x1e0 [ 46.771462] kmsan_copy_to_user+0x69/0x160 [ 46.775716] copy_page_to_iter+0x754/0x1b70 [ 46.780047] generic_file_read_iter+0x2ee8/0x4440 [ 46.784909] blkdev_read_iter+0x20d/0x280 [ 46.789069] ? blkdev_write_iter+0x5f0/0x5f0 [ 46.793478] __vfs_read+0x7dd/0x9b0 [ 46.797110] vfs_read+0x36c/0x6c0 [ 46.800571] SYSC_read+0x172/0x360 [ 46.804136] SyS_read+0x55/0x80 [ 46.807414] do_syscall_64+0x309/0x430 [ 46.811304] ? vfs_write+0x8d0/0x8d0 [ 46.815024] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 46.820215] RIP: 0033:0x7f06ee0a5310 [ 46.823921] RSP: 002b:00007ffc67b48068 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 46.831648] RAX: ffffffffffffffda RBX: 0000000000001c00 RCX: 00007f06ee0a5310 [ 46.838926] RDX: 0000000000000400 RSI: 00000000021376e8 RDI: 0000000000000003 [ 46.846202] RBP: 00000000021376c0 R08: 0000000000000028 R09: 0000000001680000 [ 46.853476] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002136030 [ 46.860750] R13: 0000000000000400 R14: 0000000002136080 R15: 00000000021376d8 [ 46.874600] Dumping ftrace buffer: [ 46.878141] (ftrace buffer empty) [ 46.881829] Kernel Offset: disabled [ 46.885439] Rebooting in 86400 seconds..