[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 17.781365] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.941357] random: sshd: uninitialized urandom read (32 bytes read) [ 20.215447] random: sshd: uninitialized urandom read (32 bytes read) [ 20.959186] random: sshd: uninitialized urandom read (32 bytes read) [ 21.099953] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.199' (ECDSA) to the list of known hosts. [ 26.558553] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.641734] WARNING: CPU: 0 PID: 4463 at mm/slab_common.c:1031 kmalloc_slab+0x56/0x70 [ 26.649855] Kernel panic - not syncing: panic_on_warn set ... [ 26.649855] [ 26.657218] CPU: 0 PID: 4463 Comm: syz-executor437 Not tainted 4.18.0-rc4-next-20180710+ #3 [ 26.665692] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.675044] Call Trace: [ 26.677637] dump_stack+0x1c9/0x2b4 [ 26.681255] ? dump_stack_print_info.cold.2+0x52/0x52 [ 26.686437] panic+0x238/0x4e7 [ 26.689625] ? add_taint.cold.5+0x16/0x16 [ 26.693773] ? __warn.cold.8+0x148/0x1ba [ 26.697837] ? __warn.cold.8+0x117/0x1ba [ 26.701903] ? kmalloc_slab+0x56/0x70 [ 26.705686] __warn.cold.8+0x163/0x1ba [ 26.709556] ? kmalloc_slab+0x56/0x70 [ 26.713341] report_bug+0x252/0x2d0 [ 26.716955] do_error_trap+0x1fc/0x4d0 [ 26.720833] ? p9_client_xattrwalk+0xe0/0x6b0 [ 26.725309] ? math_error+0x3e0/0x3e0 [ 26.729090] ? p9_client_zc_rpc.constprop.11+0x1560/0x1560 [ 26.734698] ? save_stack+0xa9/0xd0 [ 26.738309] ? p9_client_clunk+0xde/0x180 [ 26.742440] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.747279] do_invalid_op+0x1b/0x20 [ 26.750991] invalid_op+0x14/0x20 [ 26.754433] RIP: 0010:kmalloc_slab+0x56/0x70 [ 26.758827] Code: c5 c0 0a d2 88 5d c3 b8 10 00 00 00 48 85 ff 74 f4 83 ef 01 c1 ef 03 0f b6 87 e0 09 d2 88 eb d8 31 c0 81 e6 00 02 00 00 75 db <0f> 0b 5d c3 48 8b 04 c5 00 0a d2 88 5d c3 66 90 66 2e 0f 1f 84 00 [ 26.778055] RSP: 0018:ffff8801ac9bfa30 EFLAGS: 00010246 [ 26.783425] RAX: 0000000000000000 RBX: 0000000700000000 RCX: ffffffff82b10c44 [ 26.790703] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000700000000 [ 26.797986] RBP: ffff8801ac9bfa30 R08: ffff8801ace58100 R09: fffffbfff12569a8 [ 26.805264] R10: fffffbfff12569a8 R11: ffffffff892b4d43 R12: fffffffffffffff4 [ 26.812520] R13: ffff8801b30e5b80 R14: ffff8801b30e5b80 R15: 0000000000608040 [ 26.819821] ? __v9fs_get_acl+0x34/0x170 [ 26.823882] __kmalloc+0x25/0x760 [ 26.827322] ? trace_hardirqs_off+0xd/0x10 [ 26.831546] ? quarantine_put+0x10d/0x1b0 [ 26.835677] ? __v9fs_get_acl+0xc5/0x170 [ 26.839731] __v9fs_get_acl+0xc5/0x170 [ 26.843600] v9fs_get_acl+0xe5/0x2a0 [ 26.847309] v9fs_mount+0x64b/0x900 [ 26.850921] ? v9fs_drop_inode+0x150/0x150 [ 26.855145] legacy_get_tree+0x118/0x440 [ 26.859202] vfs_get_tree+0x1cb/0x5c0 [ 26.862985] do_mount+0x6c1/0x1fb0 [ 26.866538] ? check_same_owner+0x340/0x340 [ 26.870864] ? lock_release+0xa30/0xa30 [ 26.874821] ? copy_mount_string+0x40/0x40 [ 26.879040] ? kasan_kmalloc+0xc4/0xe0 [ 26.882912] ? kmem_cache_alloc_trace+0x318/0x780 [ 26.887736] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 26.893261] ? _copy_from_user+0xdf/0x150 [ 26.897393] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 26.902950] ? copy_mount_options+0x285/0x380 [ 26.907449] ksys_mount+0x12d/0x140 [ 26.911069] __x64_sys_mount+0xbe/0x150 [ 26.915034] do_syscall_64+0x1b9/0x820 [ 26.918921] ? syscall_slow_exit_work+0x500/0x500 [ 26.923770] ? syscall_return_slowpath+0x5e0/0x5e0 [ 26.928689] ? syscall_return_slowpath+0x31d/0x5e0 [ 26.933610] ? prepare_exit_to_usermode+0x291/0x3b0 [ 26.938623] ? perf_trace_sys_enter+0xb10/0xb10 [ 26.943282] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 26.948128] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 26.953325] RIP: 0033:0x4404a9 [ 26.956505] 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 [ 26.975644] RSP: 002b:00007fffabc5f1b8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 [ 26.983350] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00000000004404a9 [ 26.990614] RDX: 0000000020000900 RSI: 0000000020000000 RDI: 0000000000000000 [ 26.997883] RBP: 64663d736e617274 R08: 0000000020000540 R09: 00007fffabc5f338 [ 27.005152] R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000401d30 [ 27.012432] R13: 0000000000401dc0 R14: 0000000000000000 R15: 0000000000000000 [ 27.020296] Dumping ftrace buffer: [ 27.023830] (ftrace buffer empty) [ 27.027532] Kernel Offset: disabled [ 27.031161] Rebooting in 86400 seconds..