[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 30.071636] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 34.149218] random: sshd: uninitialized urandom read (32 bytes read) [ 34.689082] random: sshd: uninitialized urandom read (32 bytes read) [ 35.838101] random: sshd: uninitialized urandom read (32 bytes read) [ 36.051512] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.22' (ECDSA) to the list of known hosts. [ 41.545833] 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 [ 41.867373] ================================================================== [ 41.874810] BUG: KMSAN: uninit-value in do_msgrcv+0x509/0x1e30 [ 41.880789] CPU: 0 PID: 4528 Comm: syz-executor852 Not tainted 4.17.0-rc5+ #103 [ 41.888246] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.897701] Call Trace: [ 41.900282] dump_stack+0x185/0x1d0 [ 41.903909] ? do_msgrcv+0x509/0x1e30 [ 41.907722] kmsan_report+0x149/0x260 [ 41.911549] __msan_warning_32+0x6e/0xc0 executing program executing program executing program executing program executing program executing program [ 41.915638] do_msgrcv+0x509/0x1e30 [ 41.919289] ? do_msgrcv+0x1e30/0x1e30 [ 41.923192] ? syscall_return_slowpath+0xe9/0x700 [ 41.928031] ? prepare_exit_to_usermode+0x4a/0x3a0 [ 41.932965] ? syscall_return_slowpath+0xe9/0x700 [ 41.937818] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 41.943290] ? prepare_exit_to_usermode+0x149/0x3a0 [ 41.948325] __x64_sys_msgrcv+0x160/0x1b0 [ 41.952511] do_syscall_64+0x152/0x230 [ 41.956400] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.961610] RIP: 0033:0x4459b9 [ 41.964810] RSP: 002b:00007f0d57662db8 EFLAGS: 00000297 ORIG_RAX: 0000000000000046 [ 41.972564] RAX: ffffffffffffffda RBX: 00000000006dac54 RCX: 00000000004459b9 [ 41.979840] RDX: 00000000000000d0 RSI: 0000000020000000 RDI: 0000000000260007 [ 41.987114] RBP: 00000000006dac50 R08: 0000000000000000 R09: 0000000000000000 [ 41.994409] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000000 [ 42.001699] R13: 00007ffd5ab7e25f R14: 00007f0d576639c0 R15: 0000000000000006 [ 42.008975] [ 42.010588] Uninit was created at: [ 42.014122] kmsan_internal_poison_shadow+0xb8/0x1b0 [ 42.019322] kmsan_kmalloc+0x94/0x100 [ 42.023150] __kmalloc_node+0xe25/0x11f0 [ 42.027230] kvmalloc_node+0x197/0x2f0 [ 42.031158] newque+0xb4/0x7d0 [ 42.034377] ipcget+0x27b/0xd90 [ 42.037653] __x64_sys_msgget+0x14c/0x1d0 [ 42.041803] do_syscall_64+0x152/0x230 [ 42.045688] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.050872] ================================================================== [ 42.058258] Disabling lock debugging due to kernel taint [ 42.063733] Kernel panic - not syncing: panic_on_warn set ... [ 42.063733] [ 42.071101] CPU: 0 PID: 4528 Comm: syz-executor852 Tainted: G B 4.17.0-rc5+ #103 [ 42.079932] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.089301] Call Trace: [ 42.091897] dump_stack+0x185/0x1d0 [ 42.095517] panic+0x39d/0x940 [ 42.098714] ? do_msgrcv+0x509/0x1e30 [ 42.102546] kmsan_report+0x260/0x260 [ 42.106358] __msan_warning_32+0x6e/0xc0 [ 42.110439] do_msgrcv+0x509/0x1e30 [ 42.114086] ? do_msgrcv+0x1e30/0x1e30 [ 42.117982] ? syscall_return_slowpath+0xe9/0x700 [ 42.122828] ? prepare_exit_to_usermode+0x4a/0x3a0 [ 42.127768] ? syscall_return_slowpath+0xe9/0x700 [ 42.132638] ? __msan_metadata_ptr_for_store_4+0x13/0x20 [ 42.138115] ? prepare_exit_to_usermode+0x149/0x3a0 [ 42.143166] __x64_sys_msgrcv+0x160/0x1b0 [ 42.147332] do_syscall_64+0x152/0x230 [ 42.151230] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 42.156449] RIP: 0033:0x4459b9 [ 42.159653] RSP: 002b:00007f0d57662db8 EFLAGS: 00000297 ORIG_RAX: 0000000000000046 [ 42.167384] RAX: ffffffffffffffda RBX: 00000000006dac54 RCX: 00000000004459b9 [ 42.174673] RDX: 00000000000000d0 RSI: 0000000020000000 RDI: 0000000000260007 [ 42.181960] RBP: 00000000006dac50 R08: 0000000000000000 R09: 0000000000000000 [ 42.189272] R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000000 [ 42.196563] R13: 00007ffd5ab7e25f R14: 00007f0d576639c0 R15: 0000000000000006 [ 42.204557] Dumping ftrace buffer: [ 42.208095] (ftrace buffer empty) [ 42.211785] Kernel Offset: disabled [ 42.215404] Rebooting in 86400 seconds..