[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 36.136233] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 39.531050] random: sshd: uninitialized urandom read (32 bytes read) [ 39.988176] random: sshd: uninitialized urandom read (32 bytes read) [ 40.867410] random: sshd: uninitialized urandom read (32 bytes read) [ 41.141364] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.217' (ECDSA) to the list of known hosts. [ 46.930266] 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 [ 47.389823] ================================================================== [ 47.397223] BUG: KMSAN: kernel-infoleak in _copy_to_user+0x15d/0x1f0 [ 47.403731] CPU: 0 PID: 4398 Comm: syz-executor001 Not tainted 4.19.0-rc3+ #45 [ 47.411088] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.420459] Call Trace: [ 47.423083] dump_stack+0x14b/0x190 [ 47.426745] kmsan_report+0x183/0x2b0 [ 47.430573] kmsan_internal_check_memory+0xfe/0x1f0 [ 47.435592] kmsan_copy_to_user+0x73/0xb0 [ 47.439764] _copy_to_user+0x15d/0x1f0 [ 47.443663] copy_siginfo_to_user+0x81/0x130 [ 47.448101] ptrace_request+0x2278/0x2680 [ 47.452257] ? __msan_poison_alloca+0x173/0x1f0 [ 47.456956] ? _raw_spin_lock_irqsave+0x41/0xe0 [ 47.461649] ? wait_task_inactive+0x397/0x990 [ 47.466185] ? kmsan_set_origin_inline+0x6b/0x120 [ 47.471039] arch_ptrace+0xbdd/0x11a0 [ 47.474841] ? ptrace_check_attach+0x182/0x5b0 [ 47.479446] __se_sys_ptrace+0x2a2/0x7e0 [ 47.483558] __x64_sys_ptrace+0x56/0x70 [ 47.487534] do_syscall_64+0xb8/0x100 [ 47.491343] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 47.496534] RIP: 0033:0x440df9 [ 47.499746] Code: e8 cc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 47.518655] RSP: 002b:00007ffe8af43578 EFLAGS: 00000286 ORIG_RAX: 0000000000000065 [ 47.526385] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440df9 [ 47.533646] RDX: 0000000020000004 RSI: 0000000000000001 RDI: 0000000000004209 [ 47.540912] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 47.548187] R10: 0000000020000100 R11: 0000000000000286 R12: 000000000000b922 [ 47.555446] R13: 0000000000401dd0 R14: 0000000000000000 R15: 0000000000000000 [ 47.562727] [ 47.564347] Local variable description: ----kiov@ptrace_request [ 47.570385] Variable was created at: [ 47.574130] ptrace_request+0x19f/0x2680 [ 47.578185] arch_ptrace+0xbdd/0x11a0 [ 47.581987] [ 47.583623] Bytes 0-15 of 128 are uninitialized [ 47.588292] Memory access starts at ffff8801b751fca0 [ 47.593393] ================================================================== [ 47.600747] Disabling lock debugging due to kernel taint [ 47.606224] Kernel panic - not syncing: panic_on_warn set ... [ 47.606224] [ 47.613586] CPU: 0 PID: 4398 Comm: syz-executor001 Tainted: G B 4.19.0-rc3+ #45 [ 47.622320] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.631685] Call Trace: [ 47.634290] dump_stack+0x14b/0x190 [ 47.637926] panic+0x35d/0x8cb [ 47.641144] ? arch_ptrace+0xbdd/0x11a0 [ 47.645133] ? __msan_metadata_ptr_for_store_1+0x13/0x20 [ 47.650583] kmsan_report+0x2a8/0x2b0 [ 47.654389] kmsan_internal_check_memory+0xfe/0x1f0 [ 47.659423] kmsan_copy_to_user+0x73/0xb0 [ 47.663580] _copy_to_user+0x15d/0x1f0 [ 47.667489] copy_siginfo_to_user+0x81/0x130 [ 47.671927] ptrace_request+0x2278/0x2680 [ 47.676070] ? __msan_poison_alloca+0x173/0x1f0 [ 47.680761] ? _raw_spin_lock_irqsave+0x41/0xe0 [ 47.685442] ? wait_task_inactive+0x397/0x990 [ 47.689955] ? kmsan_set_origin_inline+0x6b/0x120 [ 47.694821] arch_ptrace+0xbdd/0x11a0 [ 47.698623] ? ptrace_check_attach+0x182/0x5b0 [ 47.703205] __se_sys_ptrace+0x2a2/0x7e0 [ 47.707269] __x64_sys_ptrace+0x56/0x70 [ 47.711237] do_syscall_64+0xb8/0x100 [ 47.715049] entry_SYSCALL_64_after_hwframe+0x63/0xe7 [ 47.720261] RIP: 0033:0x440df9 [ 47.723446] Code: e8 cc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 47.742339] RSP: 002b:00007ffe8af43578 EFLAGS: 00000286 ORIG_RAX: 0000000000000065 [ 47.750040] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440df9 [ 47.757313] RDX: 0000000020000004 RSI: 0000000000000001 RDI: 0000000000004209 [ 47.764610] RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8 [ 47.771868] R10: 0000000020000100 R11: 0000000000000286 R12: 000000000000b922 [ 47.779147] R13: 0000000000401dd0 R14: 0000000000000000 R15: 0000000000000000 [ 47.786755] Kernel Offset: disabled [ 47.790384] Rebooting in 86400 seconds..