[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 29.773385] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 33.341666] random: sshd: uninitialized urandom read (32 bytes read) [ 33.679725] random: sshd: uninitialized urandom read (32 bytes read) [ 34.835953] random: sshd: uninitialized urandom read (32 bytes read) [ 35.051700] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 40.547854] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 40.668213] ================================================================== [ 40.675624] BUG: KMSAN: uninit-value in process_preds+0x43b6/0x5060 [ 40.682017] CPU: 0 PID: 4504 Comm: syz-executor388 Not tainted 4.17.0+ #8 [ 40.688943] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.698278] Call Trace: [ 40.700898] dump_stack+0x185/0x1d0 [ 40.704513] kmsan_report+0x188/0x2a0 [ 40.708310] __msan_warning_32+0x70/0xc0 [ 40.712364] process_preds+0x43b6/0x5060 [ 40.716411] ? _cond_resched+0x3c/0xd0 [ 40.720285] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 40.725738] ftrace_profile_set_filter+0x2aa/0x6a0 [ 40.730659] perf_ioctl+0x1ca8/0x5870 [ 40.734459] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 40.739894] ? fd_install+0x147/0x3d0 [ 40.743686] ? kmsan_set_origin_inline+0x6b/0x120 [ 40.748511] ? __msan_poison_alloca+0x15c/0x1d0 [ 40.753162] ? __x64_sys_ioctl+0x280/0x320 [ 40.757377] ? do_vfs_ioctl+0x160/0x24b0 [ 40.761422] ? perf_poll+0x370/0x370 [ 40.765116] do_vfs_ioctl+0xcbd/0x24b0 [ 40.769006] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 40.774371] ? __fget_light+0x1f5/0x700 [ 40.778328] ? security_file_ioctl+0x5e/0x200 [ 40.782819] __x64_sys_ioctl+0x280/0x320 [ 40.786862] ? ksys_ioctl+0x260/0x260 [ 40.790644] do_syscall_64+0x15b/0x230 [ 40.794583] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 40.799755] RIP: 0033:0x43fdb9 [ 40.802923] RSP: 002b:00007ffd4188e7a8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 40.810612] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 [ 40.817862] RDX: 0000000020000040 RSI: 0000000040082406 RDI: 0000000000000003 [ 40.825112] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 40.832362] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004016e0 [ 40.839624] R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000 [ 40.846878] [ 40.848484] Uninit was created at: [ 40.852014] kmsan_internal_poison_shadow+0xb8/0x1b0 [ 40.857109] kmsan_kmalloc+0x94/0x100 [ 40.860887] __kmalloc+0x13a/0x350 [ 40.864406] process_preds+0x826/0x5060 [ 40.868359] ftrace_profile_set_filter+0x2aa/0x6a0 [ 40.873267] perf_ioctl+0x1ca8/0x5870 [ 40.877052] do_vfs_ioctl+0xcbd/0x24b0 [ 40.880939] __x64_sys_ioctl+0x280/0x320 [ 40.884992] do_syscall_64+0x15b/0x230 [ 40.888860] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 40.894033] ================================================================== [ 40.901373] Disabling lock debugging due to kernel taint [ 40.906797] Kernel panic - not syncing: panic_on_warn set ... [ 40.906797] [ 40.914143] CPU: 0 PID: 4504 Comm: syz-executor388 Tainted: G B 4.17.0+ #8 [ 40.922435] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.931778] Call Trace: [ 40.934350] dump_stack+0x185/0x1d0 [ 40.937959] panic+0x3d0/0x990 [ 40.941136] kmsan_report+0x29e/0x2a0 [ 40.944916] __msan_warning_32+0x70/0xc0 [ 40.948971] process_preds+0x43b6/0x5060 [ 40.953032] ? _cond_resched+0x3c/0xd0 [ 40.956913] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 40.962356] ftrace_profile_set_filter+0x2aa/0x6a0 [ 40.967271] perf_ioctl+0x1ca8/0x5870 [ 40.971066] ? __msan_metadata_ptr_for_store_8+0x13/0x20 [ 40.976867] ? fd_install+0x147/0x3d0 [ 40.980749] ? kmsan_set_origin_inline+0x6b/0x120 [ 40.985570] ? __msan_poison_alloca+0x15c/0x1d0 [ 40.990222] ? __x64_sys_ioctl+0x280/0x320 [ 40.994435] ? do_vfs_ioctl+0x160/0x24b0 [ 40.998480] ? perf_poll+0x370/0x370 [ 41.002182] do_vfs_ioctl+0xcbd/0x24b0 [ 41.006060] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 41.011412] ? __fget_light+0x1f5/0x700 [ 41.015368] ? security_file_ioctl+0x5e/0x200 [ 41.019851] __x64_sys_ioctl+0x280/0x320 [ 41.023891] ? ksys_ioctl+0x260/0x260 [ 41.027682] do_syscall_64+0x15b/0x230 [ 41.031552] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 41.036732] RIP: 0033:0x43fdb9 [ 41.039901] RSP: 002b:00007ffd4188e7a8 EFLAGS: 00000213 ORIG_RAX: 0000000000000010 [ 41.047588] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fdb9 [ 41.054840] RDX: 0000000020000040 RSI: 0000000040082406 RDI: 0000000000000003 [ 41.062092] RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 [ 41.069344] R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004016e0 [ 41.076594] R13: 0000000000401770 R14: 0000000000000000 R15: 0000000000000000 [ 41.084268] Dumping ftrace buffer: [ 41.087805] (ftrace buffer empty) [ 41.091492] Kernel Offset: disabled [ 41.095104] Rebooting in 86400 seconds..