[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.843817] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 19.771319] random: sshd: uninitialized urandom read (32 bytes read) [ 19.964925] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.843610] random: sshd: uninitialized urandom read (32 bytes read) [ 20.999643] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.192' (ECDSA) to the list of known hosts. [ 26.492318] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.586362] WARNING: CPU: 0 PID: 4542 at mm/slab_common.c:1031 kmalloc_slab+0x56/0x70 [ 26.594574] Kernel panic - not syncing: panic_on_warn set ... [ 26.594574] [ 26.601926] CPU: 0 PID: 4542 Comm: syz-executor157 Not tainted 4.18.0-rc4+ #142 [ 26.609352] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.618685] Call Trace: [ 26.621263] dump_stack+0x1c9/0x2b4 [ 26.624876] ? dump_stack_print_info.cold.2+0x52/0x52 [ 26.630072] panic+0x238/0x4e7 [ 26.633246] ? add_taint.cold.5+0x16/0x16 [ 26.637379] ? __warn.cold.8+0x148/0x1ba [ 26.641421] ? __warn.cold.8+0x117/0x1ba [ 26.645464] ? kmalloc_slab+0x56/0x70 [ 26.649262] __warn.cold.8+0x163/0x1ba [ 26.653148] ? kmalloc_slab+0x56/0x70 [ 26.656932] report_bug+0x252/0x2d0 [ 26.660543] do_error_trap+0x1fc/0x4d0 [ 26.664413] ? p9_client_xattrwalk+0xe0/0x6b0 [ 26.668888] ? math_error+0x3e0/0x3e0 [ 26.672668] ? p9_client_zc_rpc.constprop.10+0x1560/0x1560 [ 26.678274] ? save_stack+0xa9/0xd0 [ 26.681893] ? p9_client_clunk+0xde/0x180 [ 26.686032] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.690862] do_invalid_op+0x1b/0x20 [ 26.694557] invalid_op+0x14/0x20 [ 26.697995] RIP: 0010:kmalloc_slab+0x56/0x70 [ 26.702392] Code: c5 c0 1a d1 88 5d c3 b8 10 00 00 00 48 85 ff 74 f4 83 ef 01 c1 ef 03 0f b6 87 e0 19 d1 88 eb d8 31 c0 81 e6 00 02 00 00 75 db <0f> 0b 5d c3 48 8b 04 c5 00 1a d1 88 5d c3 66 90 66 2e 0f 1f 84 00 [ 26.721664] RSP: 0018:ffff8801aca0f980 EFLAGS: 00010246 [ 26.727028] RAX: 0000000000000000 RBX: 0000000700000000 RCX: ffffffff82adc1f4 [ 26.734298] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000700000000 [ 26.741550] RBP: ffff8801aca0f980 R08: ffff8801d9724400 R09: 0000000000000006 [ 26.748802] R10: ffff8801d9724400 R11: 0000000000000000 R12: fffffffffffffff4 [ 26.756061] R13: ffff8801bd691900 R14: ffff8801bd691900 R15: 0000000000608040 [ 26.763324] ? __v9fs_get_acl+0x34/0x170 [ 26.767371] __kmalloc+0x25/0x760 [ 26.770807] ? mark_held_locks+0xc9/0x160 [ 26.774968] ? __v9fs_get_acl+0xc5/0x170 [ 26.779018] __v9fs_get_acl+0xc5/0x170 [ 26.782896] v9fs_get_acl+0xe5/0x2a0 [ 26.786596] v9fs_mount+0x64b/0x900 [ 26.790208] mount_fs+0xae/0x328 [ 26.793556] vfs_kern_mount.part.34+0xdc/0x4e0 [ 26.798124] ? may_umount+0xb0/0xb0 [ 26.801730] ? _raw_read_unlock+0x22/0x30 [ 26.805859] ? __get_fs_type+0x97/0xc0 [ 26.809733] do_mount+0x581/0x30e0 [ 26.813258] ? copy_mount_string+0x40/0x40 [ 26.817479] ? copy_mount_options+0x5f/0x380 [ 26.821869] ? rcu_read_lock_sched_held+0x108/0x120 [ 26.826866] ? kmem_cache_alloc_trace+0x616/0x780 [ 26.831857] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 26.837375] ? _copy_from_user+0xdf/0x150 [ 26.841507] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.847036] ? copy_mount_options+0x285/0x380 [ 26.851523] ksys_mount+0x12d/0x140 [ 26.855132] __x64_sys_mount+0xbe/0x150 [ 26.859092] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.864109] do_syscall_64+0x1b9/0x820 [ 26.867993] ? syscall_return_slowpath+0x5e0/0x5e0 [ 26.873067] ? syscall_return_slowpath+0x31d/0x5e0 [ 26.877998] ? entry_SYSCALL_64_after_hwframe+0x59/0xbe [ 26.883353] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.888180] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.893362] RIP: 0033:0x4404a9 [ 26.896530] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 26.915711] RSP: 002b:00007ffece207b38 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 [ 26.923401] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00000000004404a9 [ 26.930650] RDX: 0000000020000900 RSI: 0000000020000000 RDI: 0000000000000000 [ 26.937899] RBP: 64663d736e617274 R08: 0000000020000540 R09: 00007ffece207cb8 [ 26.945165] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401d30 [ 26.952414] R13: 0000000000401dc0 R14: 0000000000000000 R15: 0000000000000000 [ 26.960292] Dumping ftrace buffer: [ 26.963923] (ftrace buffer empty) [ 26.967612] Kernel Offset: disabled [ 26.971220] Rebooting in 86400 seconds..