[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 40.336117] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 44.686291] random: sshd: uninitialized urandom read (32 bytes read) [ 45.225265] random: sshd: uninitialized urandom read (32 bytes read) [ 46.088227] random: sshd: uninitialized urandom read (32 bytes read) [ 46.367629] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 51.997929] random: sshd: uninitialized urandom read (32 bytes 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 [ 52.326490] ================================================================== [ 52.333939] BUG: KMSAN: kernel-infoleak in copy_page_to_iter+0x755/0x1af0 [ 52.340906] CPU: 0 PID: 4538 Comm: blkid Not tainted 4.18.0-rc8+ #34 [ 52.347425] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.356799] Call Trace: [ 52.359423] dump_stack+0x17c/0x1c0 [ 52.363084] kmsan_report+0x188/0x2a0 [ 52.366927] kmsan_internal_check_memory+0x17e/0x1f0 [ 52.372069] kmsan_copy_to_user+0x73/0xb0 executing program executing program executing program [ 52.376262] copy_page_to_iter+0x755/0x1af0 [ 52.380645] generic_file_read_iter+0x3469/0x4430 [ 52.385569] blkdev_read_iter+0x20d/0x270 [ 52.389753] ? blkdev_write_iter+0x5d0/0x5d0 [ 52.394188] __vfs_read+0x7b9/0x9f0 [ 52.397874] vfs_read+0x36c/0x6b0 [ 52.401364] __x64_sys_read+0x1b7/0x3c0 [ 52.405371] ? ksys_read+0x340/0x340 [ 52.409110] do_syscall_64+0x15b/0x220 [ 52.413027] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 52.418245] RIP: 0033:0x7efc7032b310 executing program executing program [ 52.421972] Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24 [ 52.441555] RSP: 002b:00007ffcaac36838 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 52.449309] RAX: ffffffffffffffda RBX: 000000000003c000 RCX: 00007efc7032b310 [ 52.456598] RDX: 0000000000000029 RSI: 000000000204f3a8 RDI: 0000000000000003 [ 52.463899] RBP: 000000000204f380 R08: 0000000000000058 R09: 0101010101010101 executing program executing program executing program [ 52.471196] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002049030 [ 52.478512] R13: 0000000000000029 R14: 0000000002049080 R15: 000000000204f398 [ 52.485820] [ 52.487471] Uninit was created at: [ 52.491054] kmsan_internal_alloc_meta_for_pages+0x146/0x700 [ 52.496906] kmsan_alloc_page+0x75/0xd0 [ 52.500897] __alloc_pages_nodemask+0xf6b/0x5c80 [ 52.505669] alloc_pages_current+0x6b1/0x970 [ 52.510097] __page_cache_alloc+0x95/0x320 [ 52.514338] generic_file_read_iter+0x27a4/0x4430 [ 52.519192] blkdev_read_iter+0x20d/0x270 [ 52.523377] __vfs_read+0x7b9/0x9f0 [ 52.527028] vfs_read+0x36c/0x6b0 [ 52.530507] __x64_sys_read+0x1b7/0x3c0 [ 52.534503] do_syscall_64+0x15b/0x220 [ 52.538416] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 52.543609] [ 52.545254] Bytes 0-40 of 41 are uninitialized [ 52.549856] Memory access starts at ffff8801926e5000 [ 52.554964] ================================================================== [ 52.562328] Disabling lock debugging due to kernel taint [ 52.567786] Kernel panic - not syncing: panic_on_warn set ... [ 52.567786] [ 52.575179] CPU: 0 PID: 4538 Comm: blkid Tainted: G B 4.18.0-rc8+ #34 [ 52.583079] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.592444] Call Trace: [ 52.595098] dump_stack+0x17c/0x1c0 [ 52.598764] panic+0x3c3/0x9a0 [ 52.602013] kmsan_report+0x29e/0x2a0 [ 52.605852] kmsan_internal_check_memory+0x17e/0x1f0 [ 52.610998] kmsan_copy_to_user+0x73/0xb0 [ 52.615186] copy_page_to_iter+0x755/0x1af0 [ 52.619563] generic_file_read_iter+0x3469/0x4430 [ 52.624488] blkdev_read_iter+0x20d/0x270 [ 52.628680] ? blkdev_write_iter+0x5d0/0x5d0 [ 52.633106] __vfs_read+0x7b9/0x9f0 [ 52.636785] vfs_read+0x36c/0x6b0 [ 52.640284] __x64_sys_read+0x1b7/0x3c0 [ 52.644295] ? ksys_read+0x340/0x340 [ 52.648037] do_syscall_64+0x15b/0x220 [ 52.651973] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 52.657180] RIP: 0033:0x7efc7032b310 [ 52.660912] Code: 73 01 c3 48 8b 0d 28 4b 2b 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 83 3d e5 a2 2b 00 00 75 10 b8 00 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 6e 8a 01 00 48 89 04 24 [ 52.680439] RSP: 002b:00007ffcaac36838 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 52.688184] RAX: ffffffffffffffda RBX: 000000000003c000 RCX: 00007efc7032b310 [ 52.695498] RDX: 0000000000000029 RSI: 000000000204f3a8 RDI: 0000000000000003 [ 52.702792] RBP: 000000000204f380 R08: 0000000000000058 R09: 0101010101010101 [ 52.710089] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000002049030 [ 52.717385] R13: 0000000000000029 R14: 0000000002049080 R15: 000000000204f398 [ 52.725019] Dumping ftrace buffer: [ 52.728560] (ftrace buffer empty) [ 52.732259] Kernel Offset: disabled [ 52.735880] Rebooting in 86400 seconds..