[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 40.226170] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 44.320598] random: sshd: uninitialized urandom read (32 bytes read) [ 44.583244] random: sshd: uninitialized urandom read (32 bytes read) [ 45.914316] random: sshd: uninitialized urandom read (32 bytes read) [ 85.215074] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts. [ 90.848132] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 143.414999] random: crng init done executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 152.325742] ================================================================== [ 152.333180] BUG: KMSAN: kernel-infoleak in copy_page_to_iter+0x77a/0x1ac0 [ 152.340122] CPU: 0 PID: 6443 Comm: blkid Not tainted 4.19.0-rc1+ #37 [ 152.346628] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 152.355992] Call Trace: [ 152.358598] dump_stack+0x14b/0x190 [ 152.362255] kmsan_report+0x183/0x2b0 [ 152.366088] kmsan_internal_check_memory+0x17e/0x1f0 [ 152.371249] kmsan_copy_to_user+0x73/0xb0 executing program [ 152.375426] copy_page_to_iter+0x77a/0x1ac0 [ 152.379800] generic_file_read_iter+0x3469/0x4430 [ 152.384751] blkdev_read_iter+0x20d/0x270 [ 152.388946] ? blkdev_write_iter+0x5d0/0x5d0 [ 152.393373] __vfs_read+0x7bb/0x9f0 [ 152.397051] vfs_read+0x36f/0x6a0 [ 152.400541] __x64_sys_read+0x1b7/0x3c0 [ 152.404560] ? ksys_read+0x340/0x340 [ 152.408309] do_syscall_64+0x15b/0x220 [ 152.412241] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 152.417446] RIP: 0033:0x7fe4e09c8310 [ 152.421185] 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 [ 152.440101] RSP: 002b:00007ffdc93257f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 152.447825] RAX: ffffffffffffffda RBX: 0000000000100000 RCX: 00007fe4e09c8310 [ 152.455103] RDX: 0000000000000400 RSI: 0000000000e28378 RDI: 0000000000000003 [ 152.462383] RBP: 0000000000e28350 R08: 0000000000000028 R09: 0000000001680000 executing program [ 152.469668] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000e25030 [ 152.476958] R13: 0000000000000400 R14: 0000000000e25080 R15: 0000000000e28368 [ 152.484284] [ 152.485923] Uninit was created at: [ 152.489482] kmsan_internal_alloc_meta_for_pages+0x146/0x700 [ 152.495305] kmsan_alloc_page+0x75/0xd0 [ 152.499298] __alloc_pages_nodemask+0xf6b/0x5c80 [ 152.504071] alloc_pages_current+0x6b1/0x970 [ 152.509027] __page_cache_alloc+0x95/0x320 [ 152.513277] generic_file_read_iter+0x27a4/0x4430 [ 152.518159] blkdev_read_iter+0x20d/0x270 [ 152.522321] __vfs_read+0x7bb/0x9f0 [ 152.525949] vfs_read+0x36f/0x6a0 [ 152.529416] __x64_sys_read+0x1b7/0x3c0 [ 152.533408] do_syscall_64+0x15b/0x220 [ 152.537314] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 152.542503] [ 152.544182] Bytes 0-1023 of 1024 are uninitialized [ 152.549115] Memory access starts at ffff88019e49f000 [ 152.554218] ================================================================== [ 152.561578] Disabling lock debugging due to kernel taint [ 152.567031] Kernel panic - not syncing: panic_on_warn set ... [ 152.567031] executing program [ 152.574417] CPU: 0 PID: 6443 Comm: blkid Tainted: G B 4.19.0-rc1+ #37 [ 152.582303] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 152.591754] Call Trace: [ 152.594395] dump_stack+0x14b/0x190 [ 152.598061] panic+0x35d/0x8cb [ 152.601359] kmsan_report+0x2a8/0x2b0 [ 152.605210] kmsan_internal_check_memory+0x17e/0x1f0 [ 152.610360] kmsan_copy_to_user+0x73/0xb0 [ 152.614546] copy_page_to_iter+0x77a/0x1ac0 [ 152.618925] generic_file_read_iter+0x3469/0x4430 [ 152.623835] blkdev_read_iter+0x20d/0x270 [ 152.628007] ? blkdev_write_iter+0x5d0/0x5d0 [ 152.632432] __vfs_read+0x7bb/0x9f0 [ 152.636100] vfs_read+0x36f/0x6a0 [ 152.639588] __x64_sys_read+0x1b7/0x3c0 [ 152.643720] ? ksys_read+0x340/0x340 [ 152.647451] do_syscall_64+0x15b/0x220 [ 152.651376] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 152.656579] RIP: 0033:0x7fe4e09c8310 executing program [ 152.660313] 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 [ 152.679949] RSP: 002b:00007ffdc93257f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 152.687867] RAX: ffffffffffffffda RBX: 0000000000100000 RCX: 00007fe4e09c8310 [ 152.695153] RDX: 0000000000000400 RSI: 0000000000e28378 RDI: 0000000000000003 [ 152.703707] RBP: 0000000000e28350 R08: 0000000000000028 R09: 0000000001680000 [ 152.711208] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000e25030 [ 152.718488] R13: 0000000000000400 R14: 0000000000e25080 R15: 0000000000e28368 [ 152.726161] Dumping ftrace buffer: [ 152.729699] (ftrace buffer empty) [ 152.733397] Kernel Offset: disabled [ 152.737036] Rebooting in 86400 seconds..